TS4909
Dual mode low power 150 mW stereo headphone amplifier with
capacitor-less and single-ended outputs
Datasheet − production data
Features
DFN10 (3 x 3)
■
No output coupling capacitors necessary
Pop-and-click noise reduction circuitry
■ Operating from VCC = 2.2 V to 5.5 V
■
■
■
Standby mode active low
Output power:
– 158 mW at 5 V, into 16 Ω with 1% THD+N
max (1 kHz)
– 52 mW at 3.0 V into 16 Ω with 1% THD+N
max (1 kHz)
Ultra-low current consumption: 2.0 mA typ. at
3V
Ultra-low standby consumption: 10 nA typ.
High signal-to-noise ratio: 105 dB typ. at 5 V
High crosstalk immunity: 110 dB (F = 1 kHz)
for single-ended outputs
PSRR: 72 dB (F = 1 kHz), inputs grounded, for
phantom ground outputs
Low tWU: 50 ms in PG mode, 100 ms in SE mode
■
Available in lead-free DFN10 3 x 3 mm
■
■
■
■
■
■
Pin connections (top view)
Vin1
1
10
Stdby
2
9
Vout1
SE/PHG
3
8
Vout3
Bypass
4
7
Vout2
Vin2
5
6
Gnd
Vdd
Functional block diagram
Vdd
SE/PHG
Vin1
Vout1
Applications
Stdby
Vout3
Bypass
■
■
Headphone amplifier
Mobile phone
■
PDA, portable audio player
BIAS
Vout2
Vin2
Description
Gnd
The TS4909 is a stereo audio amplifier designed
to drive headphones in portable applications. The
integrated phantom ground is a circuit topology
that eliminates the heavy output coupling
capacitors. This is of primary importance in
portable applications where space constraints are
very high. A single-ended configuration is also
available, offering even lower power consumption
because the phantom ground can be switched off.
Pop-and-click noise during switch-on and switchoff phases is eliminated by integrated circuitry.
January 2013
This is information on a product in full production.
Specially designed for applications requiring low
power supplies, the TS4909 is capable of
delivering 31 mW of continuous average power
into a 32 Ω load with less than 1% THD+N from a
3 V power supply. Featuring an active low
standby mode, the TS4909 reduces the supply
current to only 10 nA (typ.). The TS4909 is unity
gain stable and can be configured by external
gain-setting resistors.
Doc ID 11972 Rev 9
1/35
www.st.com
35
Contents
TS4909
Contents
1
Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 6
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.1
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.2
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3
Gain using the typical application schematics . . . . . . . . . . . . . . . . . . . . . 24
4.4
Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.1
Single-ended configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.2
Phantom ground configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4.3
Total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.5
Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.6
Wake-up time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.7
Pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.8
Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2/35
Doc ID 11972 Rev 9
TS4909
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
Figure 40.
Figure 41.
Figure 42.
Figure 43.
Figure 44.
Figure 45.
Figure 46.
Figure 47.
Figure 48.
Typical applications for the TS4909 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Open-loop frequency response, RL = 1 MΩ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Open-loop frequency response, RL = 100 Ω, CL = 400 pF . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Open-loop frequency response, RL = 1 MΩ, CL = 100 pF . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Open-loop frequency response, RL = 16 Ω . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Open-loop frequency response, RL = 16 Ω, CL = 400 pF . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Output swing vs. power supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
THD+N vs. output power, PHG, F = 1 kHz, RL = 16 Ω, Av = 1. . . . . . . . . . . . . . . . . . . . . . 10
THD+N vs. output power, PHG, F = 20 kHz, RL = 16 Ω, Av = 1. . . . . . . . . . . . . . . . . . . . . 10
THD+N vs. output power, PHG, F = 1 kHz, RL = 32 Ω, Av = 1. . . . . . . . . . . . . . . . . . . . . . 10
THD+N vs. output power, PHG, F = 20 kHz, RL = 32 Ω, Av = 1. . . . . . . . . . . . . . . . . . . . . 10
THD+N vs. output power, SE, F = 1 kHz, RL = 16 Ω, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . 10
THD+N vs. output power, SE, F = 20 kHz, RL = 16 Ω, Av = 1 . . . . . . . . . . . . . . . . . . . . . . 10
THD+N vs. output power, SE, F = 1 kHz, RL = 32 Ω, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . 11
THD+N vs. output power, SE, F = 20 kHz, RL = 32 Ω, Av = 1 . . . . . . . . . . . . . . . . . . . . . . 11
THD+N vs. output power, PHG, F = 1 kHz, RL = 16 Ω, Av = 4. . . . . . . . . . . . . . . . . . . . . . 11
THD+N vs. output power, PHG, F = 20 kHz, RL = 16 Ω, Av = 4. . . . . . . . . . . . . . . . . . . . . 11
THD+N vs. output power, PHG, F = 1 kHz, RL = 32 Ω, Av = 4. . . . . . . . . . . . . . . . . . . . . . 11
THD+N vs. output power, PHG, F = 20 kHz, RL = 32 Ω, Av = 4. . . . . . . . . . . . . . . . . . . . . 11
THD+N vs. output power, SE, F = 1 kHz, RL = 16 Ω, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . 12
THD+N vs. output power, SE, F = 20 kHz, RL = 16 Ω, Av = 4 . . . . . . . . . . . . . . . . . . . . . . 12
THD+N vs. output power, SE, F = 1 kHz, RL = 32 Ω, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . 12
THD+N vs. output power, SE, F = 20 kHz, RL = 32 Ω, Av = 4 . . . . . . . . . . . . . . . . . . . . . . 12
THD+N vs. frequency, PHG, RL = 16 Ω, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
THD+N vs. frequency, PHG, RL = 32 Ω, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
THD+N vs. frequency, SE, RL = 16 Ω, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
THD+N vs. frequency, SE, RL = 32 Ω, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
THD+N vs. frequency, PHG, RL = 16 Ω, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
THD+N vs. frequency, PHG, RL = 32 Ω, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
THD+N vs. frequency, SE, RL = 16 Ω, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
THD+N vs. frequency, SE, RL = 32 Ω, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output power vs. power supply voltage, PHG, RL = 16 Ω, F = 1 kHz. . . . . . . . . . . . . . . . . 14
Output power vs. power supply voltage, PHG, RL = 32 Ω, F = 1 kHz. . . . . . . . . . . . . . . . . 14
Output power vs. power supply voltage, SE, RL = 16 Ω, F = 1 kHz . . . . . . . . . . . . . . . . . . 14
Output power vs. power supply voltage, SE, RL = 32 Ω, F = 1 kHz . . . . . . . . . . . . . . . . . . 14
Output power vs. load resistance, PHG, Vcc = 2.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Output power vs. load resistance, SE, Vcc = 2.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Output power vs. load resistance, PHG, Vcc = 3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Output power vs. load resistance, SE, Vcc = 3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Output power vs. load resistance, PHG, Vcc = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Output power vs. load resistance, SE, Vcc = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power dissipation vs. output power, PHG, Vcc = 2.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power dissipation vs. output power, SE, Vcc = 2.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power dissipation vs. output power, PHG, Vcc = 3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power dissipation vs. output power, SE, Vcc = 3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power dissipation vs. output power, PHG, Vcc = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power dissipation vs. output power, SE, Vcc = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Crosstalk vs. frequency, SE, Vcc = 5 V, RL = 16 Ω, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . . 16
Doc ID 11972 Rev 9
3/35
List of figures
Figure 49.
Figure 50.
Figure 51.
Figure 52.
Figure 53.
Figure 54.
Figure 55.
Figure 56.
Figure 57.
Figure 58.
Figure 59.
Figure 60.
Figure 61.
Figure 62.
Figure 63.
Figure 64.
Figure 65.
Figure 66.
Figure 67.
Figure 68.
Figure 69.
Figure 70.
Figure 71.
Figure 72.
Figure 73.
Figure 74.
Figure 75.
Figure 76.
Figure 77.
Figure 78.
Figure 79.
Figure 80.
Figure 81.
Figure 82.
Figure 83.
Figure 84.
Figure 85.
4/35
TS4909
Crosstalk vs. frequency, SE, Vcc = 5 V, RL = 32 Ω, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . . 16
Crosstalk vs. frequency, SE, Vcc = 5 V, RL = 16 Ω, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . . 17
Crosstalk vs. frequency, SE, Vcc = 5 V, RL = 32 Ω, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . . 17
Crosstalk vs. frequency, PHG, Vcc = 5 V, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Crosstalk vs. frequency, PHG, Vcc = 5 V, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SNR vs. power supply voltage, PHG, unweighted, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . . . 17
SNR vs. power supply voltage, SE, unweighted, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SNR vs. power supply voltage, PHG, A-weighted, Av = 1 . . . . . . . . . . . . . . . . . . . . . . . . . 18
SNR vs. power supply voltage, SE, A-weighted, Av = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SNR vs. power supply voltage, PHG, unweighted, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . . . 18
SNR vs. power supply voltage, SE, unweighted, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SNR vs. power supply voltage, PHG, A-weighted, Av = 4 . . . . . . . . . . . . . . . . . . . . . . . . . 18
SNR vs. power supply voltage, SE, A-weighted, Av = 4. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Power supply rejection ratio vs. frequency vs. Vcc, PHG . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Power supply rejection ratio vs. frequency vs. Vcc, SE . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Power supply rejection ratio vs. frequency vs. gain, PHG . . . . . . . . . . . . . . . . . . . . . . . . . 19
Power supply rejection ratio vs. frequency vs. gain, SE . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PSRR vs. frequency vs. bypass capacitor, PHG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PSRR vs. frequency vs. bypass capacitor, SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Current consumption vs. power supply voltage, PHG . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Current consumption vs. power supply voltage, SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Current consumption vs. standby voltage, Vcc = 2.6 V, PHG . . . . . . . . . . . . . . . . . . . . . . 20
Current consumption vs. standby voltage, Vcc = 2.6 V, SE . . . . . . . . . . . . . . . . . . . . . . . . 20
Current consumption vs. standby voltage, Vcc = 3 V, PHG . . . . . . . . . . . . . . . . . . . . . . . . 20
Current consumption vs. standby voltage, Vcc = 3 V, SE . . . . . . . . . . . . . . . . . . . . . . . . . 20
Current consumption vs. standby voltage, Vcc = 5 V, PHG . . . . . . . . . . . . . . . . . . . . . . . . 21
Current consumption vs. standby voltage, Vcc = 5 V, SE . . . . . . . . . . . . . . . . . . . . . . . . . 21
Power derating curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Higher cut-off frequency vs. feedback capacitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Lower cut-off frequency vs. input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Lower cut-off frequency vs. output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Current delivered by power supply voltage in single-ended configuration . . . . . . . . . . . . . 24
Current delivered by power supply voltage in phantom ground configuration . . . . . . . . . . 25
Typical wake-up time vs. bypass capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Internal equivalent circuit schematics of the TS4909 in standby mode . . . . . . . . . . . . . . . 28
TS4909 footprint recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
DFN10 3 x 3 pitch 0.5 mm exposed pad package mechanical drawing . . . . . . . . . . . . . . . 30
Doc ID 11972 Rev 9
TS4909
1
Typical application schematics
Typical application schematics
Figure 1.
Typical applications for the TS4909
Rfeed1
20k
Vcc
Cs
1μF
Phantom ground configuration
SE/PHG
Vin1
Cin1
20k
Vout1
Rin1
330nF
Standby
Vout3
BIAS
Cb
1μF
Vin2
330nF
20k
Vout2
Rin2
Cin2
Gnd
20k
Rfeed2
Rfeed1
20k
Vcc
Cs
1μF
Single-ended configuration
SE/PHG
Vin1
Cin1
20k
Cout1
Vout1
Rin1
330nF
Standby
Vout3
BIAS
Cb
1μF
Vin2
Cout2
330nF
20k
Vout2
Rin2
Cin2
Gnd
20k
Rfeed2
Table 1.
Application component information
Component
Functional description
Rin1,2
Inverting input resistor that sets the closed loop gain in conjunction with Rfeed. This
resistor also forms a high pass filter with Cin (fc = 1 / (2 x Pi x Rin x Cin)).
Cin1,2
Input coupling capacitor that blocks the DC voltage at the amplifier’s input terminal.
Rfeed1,2
Feedback resistor that sets the closed loop gain in conjunction with Rin.
AV = closed loop gain = -Rfeed/Rin.
Cb
Half supply bypass capacitor
Cs
Supply bypass capacitor that provides power supply filtering.
Doc ID 11972 Rev 9
5/35
Absolute maximum ratings and operating conditions
2
TS4909
Absolute maximum ratings and operating conditions
Table 2.
Absolute maximum ratings
Symbol
VCC
Vi
Tstg
Tj
Rthja
Parameter
Value
Unit
6
V
-0.3V to VCC +0.3V
V
-65 to +150
°C
Maximum junction temperature
150
°C
Thermal resistance junction to ambient DFN10
120
°C/W
1.79
W
2
kV
Supply voltage (1)
Input voltage
Storage temperature
(2)
Pdiss
Power dissipation
DFN10
ESD
Human body model (pin to pin)
ESD
Machine model
220pF - 240pF (pin to pin)
200
V
Latch-up
Latch-up immunity (all pins)
200
mA
Lead temperature (soldering, 10 sec)
260
°C
170 (3)
mA
Output current
1. All voltage values are measured with respect to the ground pin.
2. Pd is calculated with Tamb = 25°C, Tjunction = 150°C.
3. Caution: this device is not protected in the event of abnormal operating conditions, such as for example,
short-circuiting between any one output pin and ground, between any one output pin and VCC, and
between individual output pins.
Table 3.
Operating conditions
Symbol
VCC
RL
Toper
CL
VSTBY
Parameter
Supply voltage
Load resistor
Operating free air temperature range
Load capacitor
RL = 16 to 100Ω
RL > 100Ω
Standby voltage input
TS4909 in STANDBY
TS4909 in active state
Value
Unit
2.2 to 5.5
V
≥ 16
Ω
-40 to + 85
°C
400
100
pF
GND ≤ VSTBY ≤ 0.4 (1)
1.35V ≤ VSTBY ≤ VCC
V
VSE/PHG
Single-ended or phantom ground configuration
voltage input
TS4909 outputs in single-ended configuration
TS4909 outputs in phantom ground configuration
VSE/PHG=VCC
VSE/PHG=0
Rthja
Thermal resistance junction-to-ambient DFN10(2)
41
V
1. The minimum current consumption (ISTBY) is guaranteed at ground for the whole temperature range.
2. When mounted on a 4-layer PCB.
6/35
Doc ID 11972 Rev 9
°C/W
TS4909
Electrical characteristics
3
Electrical characteristics
Table 4.
Electrical characteristics at VCC = +5 V with GND = 0 V and Tamb = 25°C
(unless otherwise specified)
Symbol
Parameter
ICC
Supply current
ISTBY
Standby
current
Pout
THD+N
PSRR
Iout
VO
SNR
Crosstalk
Test conditions
2.1
3.1
3.2
4.8
mA
No input signal, RL = 32Ω
10
1000
nA
RL = 32Ω, Pout = 60mW, 20Hz ≤
RL = 16Ω, Pout = 90mW, 20Hz ≤
RL = 32Ω, Pout = 60mW, 20Hz ≤
ground
RL = 16Ω, Pout = 90mW, 20Hz ≤
60
95
60
95
F ≤ 20kHz, single-ended
F ≤ 20kHz, single-ended
F ≤ 20kHz, phantom
F ≤ 20kHz, phantom ground
Inputs grounded(1), Av = -1, RL>=16Ω, Cb=1μF, F = 217Hz,
V
Power supply
ripple = 200mVpp
rejection ratio
Single-ended output referenced to phantom ground
Single-ended output referenced to ground
Max output
current
Typ. Max. Unit
No input signal, no load, single-ended
No input signal, no load, phantom ground
THD+N = 1% max, F = 1kHz, RL = 32Ω, single-ended
THD+N = 1% max, F = 1kHz, RL = 16Ω, single-ended
Output power
THD+N = 1% max, F = 1kHz, RL = 32Ω, phantom ground
THD+N = 1% max, F = 1kHz, RL = 16Ω, phantom ground
Total
harmonic
distortion +
noise
(Av=-1)
Min.
4.17
A-weighted, Av=-1, RL = 32Ω, THD +N < 0.4%,
20Hz ≤ F ≤ 20kHz
Single-ended
Phantom ground
Channel
separation
RL = 32Ω, Av=-1, phantom ground
F = 1kHz
F = 20Hz to 20kHz
RL = 32Ω, Av=-1, single-ended
F = 1kHz
F = 20Hz to 20kHz
VOO
Output offset
voltage
Phantom ground configuration, floating inputs, Rfeed=22KΩ
tWU
Wake-up time
Phantom ground configuration
Single-ended configuration
0.3
0.3
0.3
0.3
%
72
67
140
4.39
Signal-tonoise ratio
mW
dB
66
61
THD +N ≤ 1%, RL = 16Ω connected between out and VCC/2
VOL: RL = 32Ω
VOH: RL = 32Ω
Output swing
VOL: RL = 16Ω
VOH: RL = 16Ω
88
158
85
150
0.14
4.75
0.25
4.55
mA
0.47
V
0.69
dB
104
105
-73
-68
dB
-110
-90
5
20
mV
50
100
80
160
ms
1. Guaranteed by design and evaluation.
Doc ID 11972 Rev 9
7/35
Electrical characteristics
Table 5.
Electrical characteristics at VCC = +3.0 V
with GND = 0 V, Tamb = 25°C (unless otherwise specified) (1)
Symbol
Parameter
ICC
Supply current
ISTBY
Standby
current
Pout
Iout
VO
SNR
Crosstalk
Test conditions
Output swing
2.8
4.2
mA
No input signal, RL=32Ω
10
1000
nA
RL = 32Ω, Pout = 25mW, 20Hz ≤
RL = 16Ω, Pout = 40mW, 20Hz ≤
RL = 32Ω, Pout = 25mW, 20Hz ≤
ground
RL = 16Ω, Pout = 40mW, 20Hz ≤
ground
20
30
20
30
F ≤ 20kHz, single-ended
F ≤ 20kHz, single-ended
F ≤ 20kHz, phantom
F ≤ 20kHz, phantom
VOL: RL = 32Ω
VOH: RL = 32Ω
VOL: RL = 16Ω
VOH: RL = 16Ω
2.45
A-weighted, Av=-1, RL = 32Ω, THD +N < 0.4%, 20Hz ≤ F ≤
20kHz
Single-ended
Phantom ground
Channel
separation
RL = 32Ω, Av=-1, phantom ground
F = 1kHz
F = 20Hz to 20kHz
RL = 32Ω, Av=-1, single-ended
F = 1kHz
F = 20Hz to 20kHz
Output offset
voltage
Phantom ground configuration, floating inputs, Rfeed=22KΩ
tWU
Wake-up time
Phantom ground configuration
Single-ended configuration
1. All electrical values are guaranteed with correlation measurements at 2.6 and 5 V.
2. Guaranteed by design and evaluation.
Doc ID 11972 Rev 9
mW
0.3
0.3
0.3
0.3
%
70
65
82
2.6
Signal-tonoise ratio
31
52
31
54
dB
64
59
THD +N ≤ 1%, RL = 16Ω connected between out and VCC/2
VOO
8/35
Typ. Max. Unit
2
2.8
Inputs grounded (2), Av=-1, RL>=16Ω, Cb=1μF, F = 217Hz,
Power supply Vripple = 200mVpp
rejection ratio
Single-ended output referenced to phantom ground
Single-ended output referenced to ground
Max output
current
Min.
No input signal, no load, single-ended
No input signal, no load, phantom ground
THD+N = 1% max, F = 1kHz, RL = 32Ω, single-ended
THD+N = 1% max, F = 1kHz, RL = 16Ω, single-ended
Output power
THD+N = 1% max, F = 1kHz, RL = 32Ω, phantom ground
THD+N = 1% max, F = 1kHz, RL = 16Ω, phantom ground
Total harmonic
distortion +
THD+N
noise
(Av=-1)
PSRR
TS4909
0.12
2.83
0.19
2.70
mA
0.34
V
0.49
dB
100
101
-73
-68
dB
-110
-90
5
20
mV
50
100
80
160
ms
TS4909
Table 6.
Electrical characteristics
Electrical characteristics at VCC = +2.6 V
with GND = 0 V, Tamb = 25°C (unless otherwise specified)
Symbol
Parameter
ICC
Supply
current
No input signal, no load, single-ended
No input signal, no load, phantom ground
1.9
2.8
2.7
4
mA
ISTBY
Standby
current
No input signal, RL=32Ω
10
1000
nA
Pout
THD+N
PSRR
Iout
VO
SNR
Crosstalk
VOO
tWU
Test conditions
THD+N = 1% max, F = 1kHz, RL = 32Ω, single-ended
THD+N = 1% max, F = 1kHz, RL = 16Ω, single-ended
Output power
THD+N = 1% max, F = 1kHz, RL = 32Ω, phantom ground
THD+N = 1% max, F = 1kHz, RL = 16Ω, phantom ground
Total
harmonic
distortion +
noise
(Av=-1)
RL = 32Ω, Pout = 20mW, 20Hz ≤
RL = 16Ω, Pout = 30mW, 20Hz ≤
RL = 32Ω, Pout = 20mW, 20Hz ≤
ground
RL = 16Ω, Pout = 30mW, 20Hz ≤
F ≤ 20kHz, phantom ground
2.11
A weighted, Av=-1, RL = 32Ω, THD +N < 0.4%,
20Hz ≤ F ≤ 20kHz
Single-ended
Phantom ground
Channel
separation
RL = 32Ω, Av=-1, phantom ground
F = 1kHz
F = 20Hz to 20kHz
RL = 32Ω, Av=-1, single-ended
F = 1kHz
F = 20Hz to 20kHz
Output offset
Phantom ground configuration, floating inputs, Rfeed=22kΩ
voltage
Phantom ground configuration
Single-ended configuration
23
38
23
39
mW
0.3
0.3
0.3
0.3
%
70
65
70
2.25
Signal-tonoise ratio
Typ. Max. Unit
dB
64
59
THD +N ≤ 1%, RL = 16Ω connected between out and VCC/2
VOL: RL = 32Ω
V : R = 32Ω
Output swing OH L
VOL: RL = 16Ω
VOH: RL = 16Ω
Wake-up
time
15
22
15
22
F ≤ 20kHz, single-ended
F ≤ 20kHz, single-ended
F ≤ 20kHz, phantom
Inputs grounded (1), Av=-1, RL>=16Ω, Cb=1μF, F = 217Hz,
Power supply Vripple = 200mVpp
rejection ratio
Single-ended output referenced to phantom ground
Single-ended output referenced to ground
Max output
current
Min.
mA
0.11 0.3
2.45
0.18 0.44
2.32
V
dB
99
100
-73
-68
dB
-110
-90
5
20
mV
50
100
80
160
ms
1. Guaranteed by design and evaluation.
Doc ID 11972 Rev 9
9/35
Electrical characteristics
Figure 2.
TS4909
Open-loop frequency response,
RL = 1 MΩ
150
Figure 3.
Open-loop frequency response,
RL = 100 Ω, CL = 400 pF
90
100
125
45
75
100
0
50
0
75
-45
25
-45
50
-90
0
-90
25
-135
90
gain
45
-25
Phase (°)
Gain (dB)
phase
Phase (°)
Gain (dB)
gain
-135
phase
0
-180
-50
-25
-225
-75
RL=1M Ω , T AMB =25°C
-50
-1
10
-270
3
10
10
5
10
-270
3
10
Frequency (Hz)
Figure 4.
-225
RL=100 Ω , CL=400pF, T AMB =25°C
-100
-1
10
7
10
-180
5
10
7
10
10
Frequency (Hz)
Open-loop frequency response,
RL = 1 MΩ, CL = 100 pF
150
Figure 5.
90
100
45
75
Open-loop frequency response,
RL = 16 Ω
90
gain
125
45
0
25
-45
50
-90
Gain (dB)
Gain (dB)
50
-45
phase
Phase (°)
0
75
100
0
-90
phase
25
-135
-25
-135
0
-180
-50
-180
-25
-225
RL=1M Ω , CL=100pF, T AMB =25°C
-50
-1
10
-75
-270
3
10
10
5
7
10
10
-270
3
10
Frequency (Hz)
Figure 6.
-225
RL=16 Ω , T AMB =25°C
-100
-1
10
Phase (°)
gain
5
10
7
10
10
Frequency (Hz)
Open-loop frequency response,
RL = 16 Ω, CL = 400 pF
Figure 7.
Output swing vs. power supply
voltage
6
100
90
75
45
T AMB =25°C
5
25
-45
0
-90
phase
-25
-135
VOH & VOL (V)
0
Phase (°)
Gain (dB)
gain
50
4
3
RL=32 Ω
RL=16 Ω
2
-50
-75
-100
-1
10
-180
-225
RL=16 Ω , CL=400pF, T AMB =25°C
1
-270
3
10
10
Frequency (Hz)
5
10
7
10
0
2
3
4
Power Supply Voltage (V)
10/35
Doc ID 11972 Rev 9
5
6
TS4909
Electrical characteristics
Figure 8.
THD+N vs. output power, PHG,
F = 1 kHz, RL = 16 Ω, Av = 1
Figure 9.
10
10
Phantom Ground
F=1kHz, RL=16 Ω
Av=-1, Tamb=25°C
BW =20Hz-120kHz
Phantom Ground
F=20kHz, RL=16 Ω
Av=-1, Tamb=25°C
BW=20Hz-120kHz
Vcc=5V
THD+N (%)
THD+N (%)
1
THD+N vs. output power, PHG,
F = 20 kHz, RL = 16 Ω, Av = 1
Vcc=3V
0.1
Vcc=2.6V
Vcc=5V
1
Vcc=3V
Vcc=2.6V
0.1
0.01
1E-3
1E-3
0.01
0.1
0.01
1E-3
0.2
Output Power (mW)
Figure 10. THD+N vs. output power, PHG,
F = 1 kHz, RL = 32 Ω, Av = 1
Figure 11.
10
0.1
0.2
THD+N vs. output power, PHG,
F = 20 kHz, RL = 32 Ω, Av = 1
10
Phantom Ground
F=1kHz, RL=32 Ω
Av=-1, Tamb=25°C
BW =20Hz-120kHz
Phantom Ground
F=20kHz, RL=32 Ω
Av=-1, Tamb=25°C
BW=20Hz-120kHz
THD+N (%)
THD+N (%)
1
0.01
Output Power (mW)
Vcc=5V
0.1
Vcc=3V
1
Vcc=5V
Vcc=3V
Vcc=2.6V
0.1
Vcc=2.6V
0.01
1E-3
1E-3
0.01
0.1
0.01
1E-3
0.2
Output Power (mW)
Figure 12. THD+N vs. output power, SE,
F = 1 kHz, RL = 16 Ω, Av = 1
0.2
10
Single Ended
F=1kHz, RL=16 Ω
Av=-1, Tamb=25°C
BW =20Hz-120kHz
Single Ended
F=20kHz, RL=16 Ω
Av=-1, Tamb=25°C
BW=20Hz-120kHz
Vcc=5V
THD+N (%)
THD+N (%)
0.1
Figure 13. THD+N vs. output power, SE,
F = 20 kHz, RL = 16 Ω, Av = 1
10
1
0.01
Output Power (mW)
Vcc=3V
0.1
Vcc=2.6V
Vcc=5V
1
Vcc=3V
Vcc=2.6V
0.1
0.01
1E-3
1E-3
0.01
0.1
0.2
0.01
1E-3
Output Power (mW)
0.01
0.1
0.2
Output Power (mW)
Doc ID 11972 Rev 9
11/35
Electrical characteristics
TS4909
Figure 14. THD+N vs. output power, SE,
F = 1 kHz, RL = 32 Ω, Av = 1
Figure 15. THD+N vs. output power, SE,
F = 20 kHz, RL = 32 Ω, Av = 1
10
10
THD+N (%)
THD+N (%)
1
Single Ended
F=20kHz, RL=32 Ω
Av=-1, Tamb=25°C
BW=20Hz-120kHz
Single Ended
F=1kHz, RL=32 Ω
Av=-1, Tamb=25°C
BW =20Hz-120kHz
Vcc=5V
0.1
Vcc=3V
1
Vcc=5V
Vcc=3V
Vcc=2.6V
0.1
Vcc=2.6V
0.01
1E-3
1E-3
0.01
0.1
0.01
1E-3
0.2
Output Power (mW)
Figure 16. THD+N vs. output power, PHG,
F = 1 kHz, RL = 16 Ω, Av = 4
0.2
10
Phantom Ground
F=1kHz, RL=16 Ω
Av=-4, Tamb=25°C
BW =20Hz-120kHz
Phantom Ground
F=20kHz, RL=16 Ω
Av=-4, Tamb=25°C
BW=20Hz-120kHz
Vcc=5V
THD+N (%)
THD+N (%)
0.1
Figure 17. THD+N vs. output power, PHG,
F = 20 kHz, RL = 16 Ω, Av = 4
10
1
0.01
Output Power (mW)
Vcc=3V
0.1
Vcc=2.6V
Vcc=5V
Vcc=3V
1
Vcc=2.6V
0.1
0.01
1E-3
1E-3
0.01
0.1
0.01
1E-3
0.2
Output Power (mW)
Figure 18. THD+N vs. output power, PHG,
F = 1 kHz, RL = 32 Ω, Av = 4
0.2
10
Phantom Ground
F=1kHz, RL=32 Ω
Av=-4, Tamb=25°C
BW =20Hz-120kHz
Phantom Ground
F=20kHz, RL=32 Ω
Av=-4, Tamb=25°C
BW=20Hz-120kHz
Vcc=5V
THD+N (%)
THD+N (%)
0.1
Figure 19. THD+N vs. output power, PHG,
F = 20 kHz, RL = 32 Ω, Av = 4
10
1
0.01
Output Power (mW)
Vcc=3V
0.1
Vcc=2.6V
Vcc=5V
1
Vcc=3V
Vcc=2.6V
0.1
0.01
1E-3
1E-3
0.01
0.1
0.2
0.01
1E-3
Output Power (mW)
12/35
0.01
Output Power (mW)
Doc ID 11972 Rev 9
0.1
0.2
TS4909
Electrical characteristics
Figure 20. THD+N vs. output power, SE,
F = 1 kHz, RL = 16 Ω, Av = 4
Figure 21. THD+N vs. output power, SE,
F = 20 kHz, RL = 16 Ω, Av = 4
10
10
Single Ended
F=20kHz, RL=16 Ω
Av=-4, Tamb=25°C
BW=20Hz-120kHz
Vcc=5V
THD+N (%)
THD+N (%)
1
Single Ended
F=1kHz, RL=16 Ω
Av=-4, Tamb=25°C
BW =20Hz-120kHz
Vcc=3V
0.1
Vcc=2.6V
Vcc=5V
1
Vcc=3V
Vcc=2.6V
0.1
0.01
1E-3
1E-3
0.01
0.1
0.01
1E-3
0.2
0.01
Output Power (mW)
Figure 22. THD+N vs. output power, SE,
F = 1 kHz, RL = 32 Ω, Av = 4
10
Single Ended
F=1kHz, RL=32 Ω
Av=-4, Tamb=25°C
BW =20Hz-120kHz
Single Ended
F=20kHz, RL=32 Ω
Av=-4, Tamb=25°C
BW=20Hz-120kHz
Vcc=5V
THD+N (%)
THD+N (%)
0.2
Figure 23. THD+N vs. output power, SE,
F = 20 kHz, RL = 32 Ω, Av = 4
10
1
0.1
Output Power (mW)
Vcc=3V
0.1
Vcc=2.6V
Vcc=5V
1
Vcc=3V
Vcc=2.6V
0.1
0.01
1E-3
1E-3
0.01
0.1
0.01
1E-3
0.2
0.01
Output Power (mW)
Figure 24. THD+N vs. frequency, PHG,
RL = 16 Ω, Av = 1
0.2
Figure 25. THD+N vs. frequency, PHG,
RL = 32 Ω, Av = 1
1
1
Phantom Ground
RL=16 Ω, Av=-1
BW =20Hz-120kHz
T AM B =25°C
Phantom Ground
RL=32 Ω, Av=-1
BW =20Hz-120kHz
T AM B =25°C
Vcc=3V
Po=40mW
0.1
Vcc=2.6V
Po=30mW
THD+N (%)
THD+N (%)
0.1
Output Power (mW)
Vcc=5V
Po=90mW
Vcc=5V
Po=60mW
0.1
Vcc=2.6V
Po=20mW
0.01
Vcc=3V
Po=25mW
0.01
0.002
0.002
20
100
1k
10k
20k
20
Frequency (Hz)
100
1k
10k
20k
Frequency (Hz)
Doc ID 11972 Rev 9
13/35
Electrical characteristics
TS4909
Figure 26. THD+N vs. frequency, SE,
RL = 16 Ω, Av = 1
Figure 27. THD+N vs. frequency, SE,
RL = 32 Ω, Av = 1
1
1
Single Ended
RL=32 Ω, Av=-1
BW =20Hz-120kHz
T AM B =25°C
Vcc=5V
Po=90mW
THD+N (%)
THD+N (%)
Single Ended
RL=16 Ω,Av=-1
BW =20Hz-120kHz
T AM B =25°C
0.1
Vcc=3V
Po=40mW
0.1
Vcc=2.6V
Po=30mW
Vcc=2.6V
Po=20mW
0.01
Vcc=3V
Po=25mW
0.01
0.002
0.002
20
100
1k
10k
20k
20
100
Frequency (Hz)
1k
10k
20k
10k
20k
Frequency (Hz)
Figure 28. THD+N vs. frequency, PHG,
RL = 16 Ω, Av = 4
Figure 29. THD+N vs. frequency, PHG,
RL = 32 Ω, Av = 4
1
1
Phantom Ground
RL=16 Ω, Av=-4
BW =20Hz-120kHz
T AM B =25°C
Phantom Ground
RL=32 Ω, Av=-4
BW =20Hz-120kHz
T AM B =25°C
Vcc=5V
Po=90mW
THD+N (%)
THD+N (%)
Vcc=5V
Po=60mW
0.1
Vcc=2.6V
Po=30mW
Vcc=3V
Po=40mW
Vcc=5V
Po=60mW
0.1
Vcc=2.6V
Po=20mW
Vcc=3V
Po=25mW
0.01
0.01
0.005
0.002
20
100
1k
10k
20k
20
100
Frequency (Hz)
Figure 30. THD+N vs. frequency, SE,
RL = 16 Ω, Av = 4
Figure 31. THD+N vs. frequency, SE,
RL = 32 Ω, Av = 4
1
1
Single Ended
RL=16 Ω, Av=-4
BW =20Hz-120kHz
T AM B =25°C
Single Ended
RL=32 Ω, Av=-4
BW =20Hz-120kHz
T AM B =25°C
Vcc=5V
Po=90mW
THD+N (%)
THD+N (%)
1k
Frequency (Hz)
Vcc=3V
Po=40mW
0.1
Vcc=2.6V
Po=30mW
0.1
Vcc=5V
Po=60mW
Vcc=3V
Po=25mW
Vcc=2.6V
Po=20mW
0.01
0.01
0.005
0.002
20
100
1k
10k
20k
20
Frequency (Hz)
14/35
100
1k
Frequency (Hz)
Doc ID 11972 Rev 9
10k
20k
TS4909
Electrical characteristics
Figure 32. Output power vs. power supply
voltage, PHG, RL = 16 Ω, F = 1 kHz
Figure 33. Output power vs. power supply
voltage, PHG, RL = 32 Ω, F = 1 kHz
140
240
Output Power (mW)
200
Output Power (mW)
Phantom Ground
RL=16 Ω , F=1kHz
Av=-1, T AM B =25°C
BW =20Hz-120kHz
160
120
THD+N=10%
80
120
Phantom Ground
RL=32 Ω , F=1kHz
Av=-1, T AMB =25°C
100
BW =20Hz-120kHz
80
60
THD+N=10%
40
THD+N=1%
THD+N=1%
40
20
0
0
2
3
4
5
6
2
3
Power Supply Voltage (V)
Figure 34. Output power vs. power supply
voltage, SE, RL = 16 Ω, F = 1 kHz
6
140
Output Power (mW)
Single Ended
RL=16 Ω , F=1kHz
Av=-1, T AMB =25°C
200
Output Power (mW)
5
Figure 35. Output power vs. power supply
voltage, SE, RL = 32 Ω, F = 1 kHz
240
BW =20Hz-120kHz
160
120
THD+N=10%
80
120
Single Ended
RL=32 Ω , F=1kHz
Av=-1, T AMB =25°C
100
BW =20Hz-120kHz
80
60
THD+N=10%
40
THD+N=1%
THD+N=1%
40
20
0
0
2
3
4
5
6
2
3
Power Supply Voltage (V)
5
6
Figure 37. Output power vs. load resistance,
SE, Vcc = 2.6 V
50
50
Phantom Ground
Vcc=2.6V, F=1kHz
Av=-1, T AM B =25°C
BW =20Hz-120kHz
30
THD+N=1%
20
10
Single Ended
Vcc=2.6V, F=1kHz
Av=-1, T AM B =25°C
THD+N=10%
40
Output Power (mW)
THD+N=10%
40
0
16
4
Power Supply Voltage (V)
Figure 36. Output power vs. load resistance,
PHG, Vcc = 2.6 V
Output Power (mW)
4
Power Supply Voltage (V)
BW =20Hz-120kHz
30
THD+N=1%
20
10
32
48
64
80
96
0
16
Load Resistance (Ω )
32
48
64
80
96
Load Resistance (Ω )
Doc ID 11972 Rev 9
15/35
Electrical characteristics
TS4909
Figure 38. Output power vs. load resistance,
PHG, Vcc = 3 V
Figure 39. Output power vs. load resistance,
SE, Vcc = 3 V
80
80
Phantom Ground
Vcc=3V, F=1kHz
Av=-1, T AM B =25°C
Single Ended
Vcc=3V, F=1kHz
Av=-1, T AM B =25°C
THD+N=10%
Output Power (mW)
Output Power (mW)
60
BW=20Hz-120kHz
40
THD+N=1%
20
60
THD+N=10%
BW=20Hz-120kHz
40
THD+N=1%
20
0
16
32
48
64
80
0
16
96
32
48
Load Resistance (Ω )
Figure 40. Output power vs. load resistance,
PHG, Vcc = 5 V
80
96
Figure 41. Output power vs. load resistance,
SE, Vcc = 5 V
200
200
Phantom Ground
Vcc=5V, F=1kHz
Av=-1, T AM B =25°C
THD+N=10%
150
Output Power (mW)
Output Power (mW)
64
Load Resistance (Ω )
BW =20Hz-120kHz
THD+N=1%
100
50
Single Ended
Vcc=5V, F=1kHz
Av=-1, T AM B =25°C
THD+N=10%
150
BW =20Hz-120kHz
THD+N=1%
100
50
0
16
32
48
64
80
0
16
96
32
Load Resistance (Ω )
48
64
80
96
Load Resistance (Ω )
Figure 42. Power dissipation vs. output power, Figure 43. Power dissipation vs. output power,
PHG, Vcc = 2.6 V
SE, Vcc = 2.6 V
30
80
Phantom Ground
Vcc=2.6V, F=1kHz
THD+N<1%
Single Ended
Vcc=2.6V, F=1kHz
THD+N<1%
25
Power Dissipation (mW)
Power Dissipation (mW)
70
60
RL=16 Ω
50
40
30
20
RL=32 Ω
RL=16 Ω
20
RL=32 Ω
15
10
5
10
0
0
0
5
10
15
20
25
30
35
40
0
Output Power (mW)
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5
10
15
20
25
30
Output Power (mW)
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TS4909
Electrical characteristics
Figure 44. Power dissipation vs. output power, Figure 45. Power dissipation vs. output power,
PHG, Vcc = 3 V
SE, Vcc = 3 V
40
Phantom Ground
Vcc=3V, F=1kHz
THD+N<1%
100
Single Ended
Vcc=3V, F=1kHz
THD+N<1%
35
Power Dissipation (mW)
Power Dissipation (mW)
120
80
RL=16 Ω
60
40
RL=32 Ω
20
RL=16 Ω
30
25
RL=32 Ω
20
15
10
5
0
0
0
10
20
30
40
50
60
0
5
10
15
20
Output Power (mW)
25
30
35
40
45
50
55
Output Power (mW)
Figure 46. Power dissipation vs. output power, Figure 47. Power dissipation vs. output power,
PHG, Vcc = 5 V
SE, Vcc = 5 V
300
100
200
Power Dissipation (mW)
Power Dissipation (mW)
250
RL=16 Ω
Single Ended
Vcc=5V, F=1kHz, THD+N<1%
Phantom Ground
Vcc=5V, F=1kHz
THD+N<1%
RL=16 Ω
150
100
RL=32 Ω
80
60
RL=32 Ω
40
20
50
0
0
0
20
40
60
80
100
120
140
160
0
20
40
60
Output Power (mW)
Figure 48. Crosstalk vs. frequency, SE,
Vcc = 5 V, RL = 16 Ω, Av = 1
100
120
140
160
Figure 49. Crosstalk vs. frequency, SE,
Vcc = 5 V, RL = 32 Ω, Av = 1
0
0
Single Ended
Vcc=5V, RL=16 Ω
Av=-1, Po=90mW
T AM B =25°C
-40
-60
OUT1 to OUT2
-80
Single Ended
Vcc=5V, RL=32 Ω
Av=-1, Po=60mW
T AM B =25°C
-20
Crosstalk (dB)
-20
Crosstalk (dB)
80
Output Power (mW)
-40
-60
OUT2 to OUT1
-80
OUT2 to OUT1
-100
OUT1 to OUT2
-100
-120
-120
20
100
1k
10k
20k
20
Frequency (Hz)
100
1k
10k
20k
Frequency (Hz)
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Electrical characteristics
TS4909
Figure 50. Crosstalk vs. frequency, SE,
Vcc = 5 V, RL = 16 Ω, Av = 4
Figure 51. Crosstalk vs. frequency, SE,
Vcc = 5 V, RL = 32 Ω, Av = 4
0
0
Single Ended
Vcc=5V, RL=16 Ω
Av=-4, Po=90mW
T AM B =25°C
Single Ended
Vcc=5V, RL=32 Ω
Av=-4, Po=60mW
T AM B =25°C
-20
Crosstalk (dB)
Crosstalk (dB)
-20
-40
-60
OUT1 to OUT2
OUT2 to OUT1
-80
-40
-60
OUT2 to OUT1
-80
OUT1 to OUT2
-100
-100
-120
-120
20
100
1k
10k
20k
20
100
1k
Frequency (Hz)
Figure 52. Crosstalk vs. frequency, PHG,
Vcc = 5 V, Av = 1
0
Phantom ground
Vcc=5V, Av=-1,
T AM B =25°C
RL=16 Ω , Po=90mW
-40
Phantom ground
Vcc=5V, Av=-4,
T AM B =25°C
-20
Crosstalk (dB)
Crosstalk (dB)
-20
-60
-80
RL=16 Ω , Po=90mW
-40
-60
-80
RL=32 Ω , Po=60mW
-100
RL=32 Ω , Po=60mW
-100
-120
-120
20
100
1k
10k
20k
20
100
1k
Frequency (Hz)
10k
20k
Frequency (Hz)
Figure 54. SNR vs. power supply voltage,
PHG, unweighted, Av = 1
Figure 55. SNR vs. power supply voltage,
SE, unweighted, Av = 1
104
106
Unweighted Filter (20Hz-20kHz)
Unweighted Filter (20Hz-20kHz)
Phantom Ground
Av=-1, T AMB =25°C
102
Signal to Noise Ratio (dB)
Signal to Noise Ratio (dB)
20k
Figure 53. Crosstalk vs. frequency, PHG,
Vcc = 5 V, Av = 4
0
Cb=1 μ F
THD+N<0.4%
100
98
RL=16 Ω
96
RL=32 Ω
94
Single Ended
Av=-1, T AM B =25°C
104
Cb=1 μF
THD+N<0.4%
102
100
RL=16 Ω
98
RL=32 Ω
96
92
94
2
3
4
5
6
2
Power Supply Voltage (V)
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10k
Frequency (Hz)
3
4
Power Supply Voltage (V)
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6
TS4909
Electrical characteristics
Figure 56. SNR vs. power supply voltage,
PHG, A-weighted, Av = 1
Figure 57. SNR vs. power supply voltage,
SE, A-weighted, Av = 1
108
106
Phantom Ground
A-weighted Filter
Av=-1, T AM B =25°C
104
Cb=1 μF
THD+N<0.4%
Signal to Noise Ratio (dB)
Signal to Noise Ratio (dB)
108
102
RL=16 Ω
100
RL=32 Ω
98
106
Single Ended
A-weighted Filter
Av=-1, T AMB =25°C
104
Cb=1 μF
THD+N<0.4%
102
RL=16 Ω
100
RL=32 Ω
98
96
96
2
3
4
5
6
2
3
4
Power Supply Voltage (V)
Figure 58. SNR vs. power supply voltage,
PHG, unweighted, Av = 4
6
Figure 59. SNR vs. power supply voltage,
SE, unweighted, Av = 4
98
96
Unweighted Filter (20Hz-20kHz)
96
Unweighted Filter (20Hz-20kHz)
Phantom Ground
Av=-4, T AMB =25°C
Signal to Noise Ratio (dB)
Signal to Noise Ratio (dB)
5
Power Supply Voltage (V)
Cb=1 μF
THD+N<0.4%
94
92
RL=16 Ω
90
RL=32 Ω
88
Single Ended
Av=-4, T AMB =25°C
94
Cb=1 μF
THD+N<0.4%
92
RL=16 Ω
90
RL=32 Ω
88
86
84
86
2
3
4
5
6
2
3
Power Supply Voltage (V)
Figure 60. SNR vs. power supply voltage,
PHG, A-weighted, Av = 4
5
6
Figure 61. SNR vs. power supply voltage,
SE, A-weighted, Av = 4
100
98
Phantom Ground
A-weighted Filter
Av=-4, T AM B =25°C
96
Cb=1 μF
THD+N<0.4%
Signal to Noise Ratio (dB)
100
Signal to Noise Ratio (dB)
4
Power Supply Voltage (V)
94
RL=16 Ω
92
RL=32 Ω
90
98
Single Ended
A-weighted Filter
Av=-4, T AMB =25°C
96
Cb=1 μF
THD+N<0.4%
94
RL=16 Ω
92
RL=32 Ω
90
88
88
2
3
4
5
6
2
Power Supply Voltage (V)
3
4
5
6
Power Supply Voltage (V)
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Electrical characteristics
TS4909
Figure 62. Power supply rejection ratio vs.
frequency vs. Vcc, PHG
Figure 63. Power supply rejection ratio vs.
frequency vs. Vcc, SE
0
0
Phantom Ground, Inputs grounded
Av=-1, RL ≥ 16 Ω , Cb=1 μF, T AM B =25°C
-10
-20
PSRR (dB)
-20
PSRR (dB)
Single Ended, Inputs grounded
Av=-1, RL ≥ 16 Ω , Cb=1 μ F, T AMB =25°C
-10
-30
-40
Vcc=2.6V
-50
-30
-40
Vcc=2.6V
-50
Vcc=3V
Vcc=5V
Vcc=3V
Vcc=5V
-60
-60
-70
-70
-80
-80
20
100
1k
10k
20k
20
100
1k
Frequency (Hz)
Figure 64. Power supply rejection ratio vs.
frequency vs. gain, PHG
20k
Figure 65. Power supply rejection ratio vs.
frequency vs. gain, SE
0
0
Phantom Ground, Inputs grounded
Vcc=3V, RL ≥ 16 Ω , Cb=1 μF, T AMB =25°C
-10
Single Ended, Inputs grounded
Vcc=3V, RL ≥ 16 Ω , Cb=1 μ F, T AM B =25°C
-10
-20
-20
Av=-4
PSRR (dB)
Av=-4
PSRR (dB)
10k
Frequency (Hz)
-30
Av=-2
-40
Av=-1
-30
Av=-2
-40
Av=-1
-50
-50
-60
-60
-70
-70
-80
-80
20
100
1k
10k
20k
20
100
1k
Frequency (Hz)
10k
20k
Frequency (Hz)
Figure 66. PSRR vs. frequency vs. bypass
capacitor, PHG
Figure 67. PSRR vs. frequency vs. bypass
capacitor, SE
0
0
Phantom Ground, Inputs grounded
Av=-1, RL ≥ 16 Ω , Vcc=3V, T AM B =25°C
-10
Single Ended, Inputs grounded
Av=-1, RL ≥ 16 Ω , Vcc=3V, T AMB =25°C
-10
-20
-20
PSRR (dB)
PSRR (dB)
Cb=1 μF
Cb=1 μ F
-30
Cb=470nF
-40
Cb=220nF
-50
-30
Cb=470nF
Cb=220nF
-40
Cb=100nF
-50
Cb=100nF
-60
-60
-70
-70
-80
-80
20
100
1k
10k
20k
20
Frequency (Hz)
20/35
100
1k
Frequency (Hz)
Doc ID 11972 Rev 9
10k
20k
TS4909
Electrical characteristics
Figure 68. Current consumption vs. power
supply voltage, PHG
Figure 69. Current consumption vs. power
supply voltage, SE
4.0
3.0
Current Consumption (mA)
Current Consumption (mA)
3.5
3.0
2.5
2.0
T AM B =85°C
1.5
T AM B =25°C
1.0
T AM B =-40°C
0.5
2.5
2.0
1.5
1.0
T AM B =85°C
T AM B =25°C
0.5
Phantom ground
No Loads
Single ended
No Loads
T AM B =-40°C
0.0
0.0
2
3
4
5
6
2
3
Power Supply Voltage (V)
4
5
6
Power Supply Voltage (V)
Figure 70. Current consumption vs. standby
voltage, Vcc = 2.6 V, PHG
Figure 71. Current consumption vs. standby
voltage, Vcc = 2.6 V, SE
2.5
4
Current Consumption (mA)
Current Consumption (mA)
T AM B =85°C
T AM B =85°C
3
T AM B =25°C
2
T AM B =-40°C
1
2.0
T AM B =25°C
1.5
T AM B =-40°C
1.0
0.5
Phantom ground
V CC =2.6V
0
0.0
0.5
1.0
1.5
2.0
Single ended
V CC =2.6V
0.0
0.0
2.5
0.5
Standby Voltage (V)
1.0
1.5
2.0
2.5
Standby Voltage (V)
Figure 72. Current consumption vs. standby
voltage, Vcc = 3 V, PHG
Figure 73. Current consumption vs. standby
voltage, Vcc = 3 V, SE
2.5
4
Current Consumption (mA)
Current Consumption (mA)
T AM B =85°C
T AMB =85°C
3
T AM B =25°C
T AM B =-40°C
2
1
2.0
T AMB =25°C
T AM B =-40°C
1.5
1.0
0.5
Phantom ground
V CC =3V
0
0.0
0.5
1.0
1.5
2.0
2.5
Single ended
V CC =3V
3.0
0.0
0.0
Standby Voltage (V)
0.5
1.0
1.5
2.0
2.5
3.0
Standby Voltage (V)
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Electrical characteristics
TS4909
Figure 74. Current consumption vs. standby
voltage, Vcc = 5 V, PHG
Figure 75. Current consumption vs. standby
voltage, Vcc = 5 V, SE
8
8
6
Current Consumption (mA)
Current Consumption (mA)
T AM B =85°C
T AM B =25°C
T AM B =-40°C
4
2
T AM B =85°C
6
T AM B =25°C
T AM B =-40°C
4
2
Phantom ground
V CC =5V
0
0.0
0.5
1.0
1.5
2.0
4
Single ended
V CC =5V
5
0
0.0
Standby Voltage (V)
DFN10 Package Power Dissipation (W)
3.5
3.0
Mounted on a 4-layer PCB
2.5
No Heat sink
1.5
1.0
0.5
0.0
0
25
50
75
100
125
150
Ambiant Temperature (°C)
22/35
1.0
1.5
2.0
Standby Voltage (V)
Figure 76. Power derating curves
2.0
0.5
Doc ID 11972 Rev 9
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5
TS4909
Application information
4
Application information
4.1
General description
The TS4909 integrates two monolithic power amplifiers. The amplifier output can be
configured to provide either single-ended (SE) capacitively-coupled output or phantom
ground (PHG) capacitor-less output. Figure 1: Typical applications for the TS4909 on
page 5 shows schematics for each of these configurations.
Single-ended configuration
In the single-ended configuration, an output coupling capacitor, Cout, on the output of the
power amplifier (Vout1 and Vout2) is mandatory. The output of the power amplifier is biased to
a DC voltage equal to VCC/2 and the output coupling capacitor blocks this reference voltage.
Phantom ground configuration
In the phantom ground configuration, an internal buffer (Vout3) maintains the VCC/2 voltage
and the output of the power amplifiers are also biased to the VCC/2 voltage. Therefore, no
output coupling capacitors are needed. This is of primary importance in portable
applications where space constraints are continually present.
Frequency response
Higher cut-off frequency
In the high frequency region, you can limit the bandwidth by adding a capacitor Cfeed in
parallel with Rfeed. It forms a low-pass filter with a -3 dB cut-off frequency FCH. Assuming
that FCH is the highest frequency to be amplified (with a 3 dB attenuation), the maximum
value of Cfeed is:
1
F CH = --------------------------------------------2π ⋅ R feed ⋅ C feed
Figure 77. Higher cut-off frequency vs. feedback capacitor
100k
Higher Cut-off Frequency (kHz)
4.2
Rfeed=10k Ω
Rfeed=20k Ω
10k
Rfeed=40k Ω
1k
Rfeed=80k Ω
100
0.01
0.1
1
10
100
Cfeed (μF)
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Application information
TS4909
Lower cut-off frequency
The lower cut-off frequency FCL of the TS4909 depends on input capacitors Cin1,2. In the
single-ended configuration, FCL depends on output capacitors Cout1,2 as well.
The input capacitor Cin in series with the input resistor Rin of the amplifier is equivalent to a
first-order high-pass filter. Assuming that FCL is the lowest frequency to be amplified (with a
3 dB attenuation), the minimum value of Cin is:
1
C in = ---------------------------------2π ⋅ F CL ⋅ R in
In the single-ended configuration, the capacitor Cout in series with the load resistor RL is
equivalent to a first-order high-pass filter. Assuming that FCL is the lowest frequency to be
amplified (with a 3 dB attenuation), the minimum value of Cout is:
1
C out = --------------------------------2π ⋅ F CL ⋅ R L
Figure 78. Lower cut-off frequency vs. input
capacitor
Figure 79. Lower cut-off frequency vs. output
capacitor
10k
10k
R L =16 Ω
Lower Cut-off frequency (Hz)
Lower Cut-off frequency (Hz)
Rin=10k Ω
Rin=20k Ω
Rin=50k Ω
1k
Rin=100k Ω
100
10
1
10
100
1000
R L =32 Ω
R L =300 Ω
1k
R L =600 Ω
100
10
0.1
1
Cin (nF)
10
100
1000
Cout (μF)
Note:
If FCL is kept the same for calculation purposes, it must be taken into account that the 1storder high-pass filter on the input and the 1st-order high-pass filter on the output create a
2nd-order high-pass filter in the audio signal path with an attenuation of 6 dB on FCL and a
roll-off of 40 db ⁄ decade.
4.3
Gain using the typical application schematics
In the flat region (no Cin effect), the output voltage of a channel is:
R feed
V OUT = V IN ⋅  – -------------- = V IN ⋅ A V
 R in 
The gain AV is:
R feed
A V = – -------------R in
Note:
24/35
The configuration (either single-ended or phantom ground) has no effect on the value of the
gain.
Doc ID 11972 Rev 9
TS4909
4.4
Application information
Power dissipation and efficiency
Hypotheses
●
Voltage and current (Vout and Iout) in the load are sinusoidal.
●
The supply voltage (VCC) is a pure DC source.
Regarding the load we have:
V OUT = V PEAK sin ωt ( V )
and
V OUT
I OUT = -------------- ( A )
RL
and
2
V PEAK
P OUT = ----------------- ( A )
2R L
4.4.1
Single-ended configuration
The average current delivered by the power supply voltage is:
π
V PEAK
1 V PEAK
Icc AVG = ------  ----------------- sin ( t ) dt = ----------------- ( A )
RL
πR L
2π
0
Figure 80. Current delivered by power supply voltage in single-ended configuration
Icc (t)
Vpeak/RL
IccAVG
0
T/2
T
3T/2
2T Time
The power delivered by the power supply voltage is:
P supply = V CC I CC
AVG
(W)
Therefore, the power dissipation by each power amplifier is:
P diss = P supply – P OUT ( W )
2V CC
P diss = ------------------- P OUT – P OUT ( W )
π RL
and the maximum value is obtained when:
∂P diss
= 0
∂ P OUT
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Application information
TS4909
and its value is:
2
P diss
Note:
MAX
V CC
= ------------(W)
2
π RL
This maximum value depends only on the power supply voltage and load values.
The efficiency is the ratio between the output power and the power supply.
P OUT
πV PEAK
η = ------------------- = --------------------P supply
2V CC
The maximum theoretical value is reached when VPEAK = VCC/2, so:
π
η = --- = 78.5%
4
4.4.2
Phantom ground configuration
The average current delivered by the power supply voltage is:
π
Icc AVG
2V PEAK
1 V PEAK
= ---  ----------------- sin ( t ) dt = --------------------- ( A )
π
RL
πR L
0
Figure 81. Current delivered by power supply voltage in phantom ground
configuration
Icc (t)
Vpeak/RL
IccAVG
0
T/2
T
3T/2
2T Time
The power delivered by the power supply voltage is:
P supply = V CC I CC
AVG
(W)
Therefore, the power dissipation by each amplifier is:
2 2V CC
P diss = ---------------------- P OUT – P OUT ( W )
π RL
and the maximum value is obtained when:
∂P diss
= 0
∂ P OUT
and its value is:
2
P diss
Note:
26/35
MAX
2V CC
= --------------(W)
2
π RL
This maximum value depends only on the power supply voltage and load values.
Doc ID 11972 Rev 9
TS4909
Application information
The efficiency is the ratio between the output power and the power supply.
P OUT
πV PEAK
η = ------------------- = --------------------P supply
4V CC
The maximum theoretical value is reached when VPEAK = VCC/2, so:
π
η = --- = 39.25%
8
4.4.3
Total power dissipation
The TS4909 is a stereo (dual channel) amplifier. It has two independent power amplifiers.
Each amplifier produces heat due to its power dissipation. Therefore the maximum die
temperature is the sum of each amplifier’s maximum power dissipation. It is calculated as
follows:
●
Pdiss 1 = power dissipation due to the first channel power amplifier (Vout1).
●
Pdiss 2 = power dissipation due to the second channel power amplifier (Vout2).
●
Total Pdiss = Pdiss 1 + Pdiss 2 (W)
In most cases, Pdiss 1 = Pdiss 2, giving:
TotalP diss = 2P diss1 = 2P diss2
Single-ended configuration:
2 2V CC
TotalP diss = ---------------------- P OUT – 2P OUT
π RL
Phantom ground configuration:
4 2V CC
TotalP diss = ---------------------- P OUT – 2P OUT
π RL
4.5
Decoupling of the circuit
Two capacitors are needed to properly bypass the TS4909 — a power supply capacitor Cs
and a bias voltage bypass capacitor Cb.
Cs has a strong influence on the THD+N at high frequencies (above 7 kHz) and indirectly on
the power supply disturbances. With 1 μF, you could expect the THD+N performance to be
similar to the values shown in this datasheet. If Cs is lower than 1 μF, THD+N increases at
high frequencies and disturbances on the power supply rail are less filtered. On the contrary,
if Cs is higher than 1 μF, those disturbances on the power supply rail are more filtered.
Cb has an influence on THD+N at lower frequencies, but its value is critical on the final result
of PSRR with inputs grounded at lower frequencies.
●
If Cb is lower than 1 μF, THD+N increases at lower frequencies and the PSRR worsens
(increases).
●
If Cb is higher than 1 μF, the benefit on THD+N and PSRR in the lower frequency range
is small.
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Application information
4.6
TS4909
Wake-up time
When the standby is released to turn the device ON, the bypass capacitor Cb is charged
immediately. As Cb is directly linked to the bias of the amplifier, the bias will not work
properly until the Cb voltage is correct. The time to reach this voltage plus a time delay of
40 ms (pop precaution) is called the wake-up time or tWU. It is specified in the electrical
characteristics tables with Cb = 1 μF (see Section 3: Electrical characteristics on page 7).
If Cb has a value other than 1 μF, you can calculate tWU by using the following formulas, or
read it directly from the graph in Figure 82.
Single-ended configuration:
Cb ⋅ 2.5
t WU = -------------------- + 40
0.042
[ms;μF ]
Phantom ground configuration:
Cb ⋅ 2.5
t WU = -------------------- + 40
0.417
[ms;μF ]
Figure 82. Typical wake-up time vs. bypass capacitance
350
T AMB =25°C
300
Wake-up Time (ms)
Single Ended
250
200
150
Phantom Ground
100
50
0
0
1
2
3
4
5
Cb (μF)
Note:
It is assumed that the Cb voltage is equal to 0 V. If the Cb voltage is not equal to 0 V, the
wake-up time is lower.
4.7
Pop performance
Pop performance in the phantom ground configuration is closely linked with the size of the
input capacitor Cin. The size of Cin is dependent on the lower cut-off frequency and PSRR
values requested.
In order to reach low pop, Cin must be charged to VCC/2 in less than 40 ms. To follow this
rule, the equivalent input constant time (RinCin) should be less then 8 ms.
τin = Rin x Cin < 0.008 s
By following the previous rules, the TS4909 can reach low pop even with a high gain such
as 20 dB.
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Doc ID 11972 Rev 9
TS4909
Application information
Sample calculation
With Rin = 20 kΩ and FCL = 20 Hz and a -3 db low cut-off frequency, Cin = 398 nF.
Therefore, Cin = 390 nF with standard values which gives a lower cut-off frequency equal to
20.4 Hz.
In this case:
τin = Rin x Cin = 7.8 ms
This value is sufficient with regard to the previous formula, so we can state that the pop will
be imperceptible.
Connecting the headphones
In general, the headphones are connected using a jack connector. To prevent pop in the
headphones while plugging in the jack, a pulldown resistor should be connected in parallel
with each headphone output. This allows the capacitors Cout to be charged even when no
headphones are plugged in.
A resistor of 1 kΩ is high enough to be a negligible load, and low enough to charge the
capacitors Cout in less than one second.
4.8
Standby mode
When the TS4909 is in standby mode, the time required to put the output stages
(Vout1, Vout2 and Vout3) into a high impedance state with reference to ground, and the
internal circuitry in standby mode, is a few microseconds.
Figure 83. Internal equivalent circuit schematics of the TS4909 in standby mode
Vin1
Vout1
25K
1M
BYPASS
Vout3
25K
Vin2
Vout2
1M
GND
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Package information
5
TS4909
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 84. TS4909 footprint recommendation
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Package information
Figure 85. DFN10 3 x 3 pitch 0.5 mm exposed pad package mechanical drawing
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Package information
Table 7.
TS4909
DFN10 3 x 3 pitch 0.5 mm exposed pad package mechanical data
Dimensions
Ref.
A
Millimeters
Min.
Typ.
Max.
Min.
Typ.
Max.
0.80
0.90
1.00
0.031
0.035
0.040
0.02
0.05
0.0008
0.002
0.65
0.80
0.026
0.031
A1
A2
0.55
A3
0.008
b
0.18
0.25
0.30
0.007
0.010
0.012
D
2.85
3.00
3.15
0.112
0.118
0.124
D2
2.20
2.70
0.087
E
2.85
3.15
0.112
E2
1.40
1.75
0.055
L
ddd
32/35
0.022
0.20
e
Note:
Inches
3.00
0.50
0.30
0.40
0.106
0.118
0.124
0.069
0.020
0.50
0.08
0.012
0.016
0.020
0.003
The DFN10 package has an exposed pad E2 x D2. For enhanced thermal performance, the
exposed pad must be soldered to a copper area on the PCB, acting as a heatsink. This
copper area can be electrically connected to pin 6 (GND) or left floating.
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6
Ordering information
Ordering information
Table 8.
Order codes
Part number
Temperature range
Package
Packing
Marking
TS4909IQT
-40°C to +85°C
DFN10
Tape & reel
K909
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Revision history
7
TS4909
Revision history
Table 9.
Document revision history
Date
Revision
01-Dec-2006
6
Release to production of the device.
02-Jan-2007
7
Correction of revision number of December revision (revision 6
instead of revision 5).
26-Sep-2007
8
Updated Table 2: Absolute maximum ratings.
9
Added list of figures.
Updated package information in Chapter 5 (drawing and data).
Added note under Table 7 on page 32 regarding exposed pad
connectivity.
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Changes
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