TS4961T
Mono class D audio power amplifier with dedicated analog switch
Features
QFN 16 3 x 3 mm
■
Wide operating voltage range from
VCC = 2.4 V to 4.3 V
■
Audio amplifier standby mode active low
■
Output power: 1.6 W at 4.2 V or 0.75 W at
3.0 V into 4 Ω with 1% THD+N maximum
■
Output power: 0.95 W at 4.2 V or 0.45 W at
3.0 V into 8 Ω with 1% THD+N maximum
■
Adjustable gain via external resistors
■
Low current consumption 2 mA at 3 V
■
Efficiency: 88% typical
■
Signal-to-noise ratio: 85 dB typical
■
PSRR: 63 dB typical at 217 Hz with 6 dB gain
■
PWM base frequency: 250 kHz
■
Low pop and click noise
■
Dual Power SPST with separated control
■
Ultra-high off-isolation on analog switch:
-80 dB typical from 20 Hz to 20 kHz
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TS4961TIQT pinout
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Applications
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Cellular telephones
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PDAs
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ODescription
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Notebook PCs
The audio amplifying gain of the device can be
controlled via two external gain-setting resistors. It
is designed to operate from 2.4 to 4.3 V, making
this device ideal for portable applications.
The TS4961T is a smart combination of one
mono class D audio power amplifier and a
high-speed CMOS low-voltage dual power analog
SPST.
One of the key functions of this device is the
switch mode of the various audio signals coming
from the codec or baseband through the
loudspeaker. It can drive up to 1.6 W into a 4 Ω
load and 0.95 W into an 8 Ω load. It achieves an
outstanding efficiency of up to 88% typical.
September 2008
Rev 1
1/49
www.st.com
49
Contents
TS4961T
Contents
1
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3
2
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
2.1
Audio amplifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2
Analog switch section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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3.1
Audio amplifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2
Analog switch section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.1
Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.2
Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.3
Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.4
Wake-up time (tWU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.5
Shutdown time (tSTBY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.6
Consumption in standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.7
Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.8
Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.9
Examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
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4.9.1
Example 1: dual differential inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.9.2
Example 2: one differential input plus one single-ended input . . . . . . . . 42
Using the audio amplifier and switch on the same speaker . . . . . . . . . . . 43
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Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
2/49
TS4961T
Absolute maximum ratings and operating conditions
1
Absolute maximum ratings and operating conditions
Table 1.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
GND to 5.5
V
GND-0.3V / VCC+0.3V
V
VCCA & VCCS Supply voltage (1) (2)
Vin
Input voltage
Toper
Operating free-air temperature range
-40 to + 85
°C
Tstg
Storage temperature
-65 to +150
°C
150
°C
Tj
Maximum junction temperature
Rthja
Thermal resistance junction to ambient
Rthjc
Thermal resistance junction to case
Pd
Human body model
Machine model
VSTBY
5
°C/W
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Internally limited (4)
(5)
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Lead temperature (soldering, 10 sec)
°C/W
kV
200
V
200
100
200
mA
GND-0.3V / VCC+0.3V
V
260
°C
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Latch-up immunity of the Class D Amplifier (All Pins)
Latch-up immunity of the Analog Switch (Supply Pins)
Latch-up immunity of the Analog Switch Supply (I/O Pins)
Standby pin voltage maximum voltage
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Power dissipation
ESD
Latch-up
(3)
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1. Caution: this device is not protected in the event of abnormal operating conditions, such as short-circuiting between any
one output pin and ground, between any one output pin and VCC, and between individual output pins.
2. All voltage values are measured with respect to the ground pin.
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3. When mounted on a 4-layers PCB.
4. Exceeding the power derating curves during a long period provokes abnormal operating conditions.
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5. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor
between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.
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6. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the
device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of connected pin combinations
while the other pins are floating.
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Table 2.
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Operating conditions for audio amplifier section
Symbol
VCCA
VIC
VSTBY
RL
Parameter
Supply voltage(1)
Common mode input voltage range
(2)
Standby voltage input: (3)
Class D amplifier ON
Class D amplifier OFF(4)
Load resistor
Value
Unit
2.4 to 4.3
V
0.5 to VCC-0.8
V
1.4 ≤ VSTBY ≤ VCC
GND ≤ VSTBY ≤ 0.4
V
≥4
Ω
1. For VCC from 2.4 V to 2.5 V, the operating temperature range is reduced to 0° C≤ Tamb ≤70° C.
2. For VCC from 2.4 V to 2.5 V, the common mode input range must be set at VCC/2.
3. Without any signal on VSTBY, the device is in standby.
4. Minimum current consumption is obtained when VSTBY = GND.
3/49
Absolute maximum ratings and operating conditions
Table 3.
Operating conditions for analog switch section
Symbol
Parameter
Value
Unit
VCC
Supply voltage
2.4 to 4.3
V
Vin
Input voltage
0 to VCC
V
VIC
Control input voltage
0 to 4.3
V
VO
Output voltage
0 to VCC
V
dt/dv
Table 4.
Table 5.
Input rise and fall time control input
0 to 20
VCC = 3.0 V to 4.3 V
0 to 10
ns/V
/STDBY
Functional description
Low
OFF
Device is in shut-down mode
High
ON
Device is in operating mode
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SLn
Switch N°1
High
ON
D1 is connected to T1
Low
OFF
High impedance from D1 to T1
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Analog switch settings truth table
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VCC = 2.5 V
Audio amplifier standby mode settings
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4/49
TS4961T
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Switch N°2
ON
D2 is connected to T2
OFF
High impedance from D2 to T2
TS4961T
Absolute maximum ratings and operating conditions
Table 6.
Pin description
Name
Pin number
Function
VCCA
6
Class D audio amplifier power supply voltage input pin
VCCS
2
Analog switch power supply voltage input pin
/STDBY
12
Standby input pin (active low) to disable the audio amplifier
T1
1
Independent output audio channel 1
D2
3
Common input audio channel 2
SL2
4
Select input pin for D2 to T2 (active high)
OUT+
5
Positive differential audio output
GNDA
7
Audio amplifier input ground
OUT-
8
Negative differential audio output
T2
9
Independent output audio channel 2
GNDS
10
Analog switch input ground
SL1
11
Select input pin for D1 to T1 (active high)
D1
13
Common input audio channel 1
NC
14
No internal connection
IN-
15
Audio negative differential input
IN+
16
Audio positive differential input
E-Pad
-
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Exposed pad (should be connected to GND)
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5/49
Electrical characteristics
TS4961T
2
Electrical characteristics
2.1
Audio amplifier section
Table 7.
Electrical characteristics at VCC = +4.3 V with GND = 0 V, Vicm = 2.1 V and
Tamb = 25° C (unless otherwise specified)(1)
Symbol
Typ.
Max.
Unit
Supply current
No input signal, no load
2.1
3
mA
Standby current (2)
No input signal, VSTBY = GND
10
1000
nA
Voo
Output offset voltage
No input signal, RL = 8Ω
3
25
mV
Pout
Output power, G=6dB
THD = 1% Max, f = 1kHz, RL = 4Ω
THD = 10% Max, f = 1kHz, RL = 4Ω
THD = 1% Max, f = 1kHz, RL = 8Ω
THD = 10% Max, f = 1kHz, RL = 8Ω
ICC
ISTBY
Parameter
Min.
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Total harmonic distortion + noise
Pout = 600 mWRMS, G = 6dB, 20Hz < f < 20kHz
THD + N
RL = 8Ω + 15µH, BW < 30kHz
Pout = 700mWRMS, G = 6dB, f = 1kHz
RL = 8Ω + 15µH, BW < 30kHz
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Gain
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Power supply rejection ratio with inputs grounded (3)
f = 217Hz, RL = 8Ω, G=6dB, Vripple = 200mVpp
%
dB
63
Common mode rejection ratio
f = 217Hz, RL = 8Ω, G = 6dB, ΔVic = 200mVpp
Gain value (Rin in kΩ)
%
78
88
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CMRR
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0.35
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1.5
1.95
0.9
1.1
2
Efficiency
Efficiency
Pout = 1.45 WRMS, RL = 4Ω + ≥ 15µH
Pout = 0.9 WRMS, RL = 8Ω+ ≥ 15µH
PSRR
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dB
273k Ω
----------------R
in
300k Ω
----------------R
in
327k Ω
----------------R
in
V/V
273
300
327
kΩ
RSTBY
Internal resistance from standby to GND
FPWM
Pulse width modulator base frequency
280
kHz
SNR
Signal to noise ratio (A-weighting)
Pout = 0.8W, RL = 8Ω
85
dB
tWU
Wake-up time
5
10
ms
tSTBY
Standby time
5
10
ms
TS4961T
Electrical characteristics
Table 7.
Electrical characteristics at VCC = +4.3 V with GND = 0 V, Vicm = 2.1 V and
Tamb = 25° C (unless otherwise specified)(1) (continued)
Symbol
Parameter
Min.
Typ.
Max.
Unit
Output voltage noise f = 20Hz to 20kHz, G = 6dB
VN
Unweighted RL = 4Ω
A-weighted RL = 4Ω
85
60
Unweighted RL = 8Ω
A-weighted RL = 8Ω
86
62
Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
83
60
Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
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μVRMS
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Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
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1. All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V.
2. Standby mode is active when VSTBY is tied to GND.
3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to
VCC at f = 217 Hz.
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Electrical characteristics
Table 8.
TS4961T
Electrical characteristics at VCC = +3.6 V with GND = 0 V, Vicm = 1.8 V,
Tamb = 25° C (unless otherwise specified)(1)
Symbol
Typ.
Max.
Unit
Supply current
No input signal, no load
2
2.8
mA
Standby current (2)
No input signal, VSTBY = GND
10
1000
nA
Voo
Output offset voltage
No input signal, RL = 8Ω
3
25
mV
Pout
Output power, G=6dB
THD = 1% Max, f = 1kHz, RL = 4Ω
THD = 10% Max, f = 1kHz, RL = 4Ω
THD = 1% Max, f = 1kHz, RL = 8Ω
THD = 10% Max, f = 1kHz, RL = 8Ω
ICC
ISTBY
Parameter
Min.
1.1
1.4
0.7
0.85
Total harmonic distortion + noise
Pout = 450 mWRMS, G = 6dB, 20Hz < f < 20kHz
THD + N
RL = 8Ω + 15µH, BW < 30kHz
Pout = 500mWRMS, G = 6dB, f = 1kHz
RL = 8Ω + 15µH, BW < 30kHz
Efficiency
8/49
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2
%
0.1
78
88
%
Power supply rejection ratio with inputs grounded (3)
f = 217Hz, RL = 8Ω, G=6dB, Vripple = 200mVpp
62
dB
CMRR
Common mode rejection ratio
f = 217Hz, RL = 8Ω, G = 6dB, ΔVic = 200mVpp
56
dB
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Gain value (Rin in kΩ)
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PSRR
Gain
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Efficiency
Pout = 1 WRMS, RL = 4Ω + ≥ 15µH
Pout = 0.65 WRMS, RL = 8Ω+ ≥ 15µH
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273k Ω
----------------R in
300k Ω
----------------R in
327k Ω
----------------R in
V/V
273
300
327
kΩ
RSTBY
Internal resistance from standby to GND
FPWM
Pulse width modulator base frequency
280
kHz
SNR
Signal to noise ratio (A-weighting)
Pout = 0.6W, RL = 8Ω
83
dB
tWU
Wake-up time
5
10
ms
tSTBY
Standby time
5
10
ms
TS4961T
Electrical characteristics
Table 8.
Electrical characteristics at VCC = +3.6 V with GND = 0 V, Vicm = 1.8 V,
Tamb = 25° C (unless otherwise specified)(1) (continued)
Symbol
Parameter
Min.
Typ.
Max.
Unit
Output voltage noise f = 20Hz to 20kHz, G = 6dB
VN
Unweighted RL = 4Ω
A-weighted RL = 4Ω
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Unweighted RL = 8Ω
A-weighted RL = 8Ω
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Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
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Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
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μVRMS
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Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
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1. All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V.
2. Standby mode is activated when VSTBY is tied to GND.
3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to
VCC at f = 217 Hz.
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Electrical characteristics
Table 9.
TS4961T
Electrical characteristics at VCC = +3.0 V with GND = 0 V, Vicm = 1.5 V,
Tamb = 25° C (unless otherwise specified)(1)
Symbol
Typ.
Max.
Unit
Supply current
No input signal, no load
1.9
2.7
mA
Standby current (2)
No input signal, VSTBY = GND
10
1000
nA
Voo
Output offset voltage
No input signal, RL = 8Ω
3
25
mV
Pout
Output power, G=6dB
THD = 1% Max, f = 1kHz, RL = 4Ω
THD = 10% Max, f = 1kHz, RL = 4Ω
THD = 1% Max, f = 1kHz, RL = 8Ω
THD = 10% Max, f = 1kHz, RL = 8Ω
ICC
ISTBY
Parameter
Min.
0.7
1
0.5
0.6
Total harmonic distortion + noise
Pout = 300 mWRMS, G = 6dB, 20Hz < f < 20kHz
THD + N
RL = 8Ω + 15µH, BW < 30kHz
Pout = 350mWRMS, G = 6dB, f = 1kHz
RL = 8Ω + 15µH, BW < 30kHz
Power supply rejection ratio with inputs grounded (3)
f = 217Hz, RL = 8Ω, G=6dB, Vripple = 200mVpp
CMRR
Common mode rejection ratio
f = 217Hz, RL = 8Ω, G = 6dB, ΔVic = 200mVpp
Gain
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Gain value (Rin in kΩ)
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PSRR
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Efficiency
Efficiency Pout = 0.7 WRMS, RL = 4Ω + ≥ 15µH
Pout = 0.45 WRMS, RL = 8Ω+ ≥ 15µH
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2
%
0.1
78
88
%
dB
60
54
dB
273k Ω
----------------R in
300k Ω
----------------R in
327k Ω
----------------R in
V/V
273
300
327
kΩ
RSTBY
Internal resistance from standby to GND
FPWM
Pulse width modulator base frequency
280
kHz
SNR
Signal to noise ratio (A-weighting)
Pout = 0.4W, RL = 8Ω
82
dB
tWU
Wake-up time
5
10
ms
tSTBY
Standby time
5
10
ms
TS4961T
Electrical characteristics
Table 9.
Electrical characteristics at VCC = +3.0 V with GND = 0 V, Vicm = 1.5 V,
Tamb = 25° C (unless otherwise specified)(1) (continued)
Symbol
Parameter
Min.
Typ.
Max.
Unit
Output voltage noise f = 20Hz to 20kHz, G = 6dB
VN
Unweighted RL = 4Ω
A-weighted RL = 4Ω
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Unweighted RL = 8Ω
A-weighted RL = 8Ω
83
61
Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
81
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Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
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μVRMS
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Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
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1. All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V.
2. Standby mode is active when VSTBY is tied to GND.
3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to
VCC at f = 217 Hz.
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Electrical characteristics
Table 10.
TS4961T
Electrical characteristics at VCC = +2.5 V with GND = 0 V, Vicm = 1.25 V,
Tamb = 25° C (unless otherwise specified)
Symbol
Typ.
Max.
Unit
Supply current
No input signal, no load
1.7
2.4
mA
Standby current (1)
No input signal, VSTBY = GND
10
1000
nA
Voo
Output offset voltage
No input signal, RL = 8Ω
3
25
mV
Pout
Output power, G=6dB
THD = 1% Max, f = 1kHz, RL = 4Ω
THD = 10% Max, f = 1kHz, RL = 4Ω
THD = 1% Max, f = 1kHz, RL = 8Ω
THD = 10% Max, f = 1kHz, RL = 8Ω
ICC
ISTBY
Parameter
Min.
0.5
0.65
0.33
0.41
Total harmonic distortion + noise
Pout = 180 mWRMS, G = 6dB, 20Hz < f < 20kHz
THD + N
RL = 8Ω + 15µH, BW < 30kHz
Pout = 200mWRMS, G = 6dB, f = 1kHz
RL = 8Ω + 15µH, BW < 30kHz
Efficiency
12/49
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1
%
0.05
78
88
%
Power supply rejection ratio with inputs grounded (2)
f = 217Hz, RL = 8Ω, G=6dB, Vripple = 200mVpp
60
dB
CMRR
Common mode rejection ratio
f = 217Hz, RL = 8Ω, G = 6dB, ΔVic = 200mVpp
54
dB
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Gain value (Rin in kΩ)
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PSRR
Gain
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Efficiency
Pout = 0.47 WRMS, RL = 4Ω + ≥ 15µH
Pout = 0.3 WRMS, RL = 8Ω+ ≥ 15µH
)
s
(
ct
273k Ω
----------------R in
300k Ω
----------------R in
327k Ω
----------------R in
V/V
273
300
327
kΩ
RSTBY
Internal resistance from standby to GND
FPWM
Pulse width modulator base frequency
280
kHz
SNR
Signal to noise ratio (A-weighting)
Pout = 0.3W, RL = 8Ω
80
dB
tWU
Wake-up time
5
10
ms
tSTBY
Standby time
5
10
ms
TS4961T
Electrical characteristics
Table 10.
Electrical characteristics at VCC = +2.5 V with GND = 0 V, Vicm = 1.25 V,
Tamb = 25° C (unless otherwise specified) (continued)
Symbol
Parameter
Min.
Typ.
Max.
Unit
Output voltage noise f = 20Hz to 20kHz, G = 6dB
VN
Unweighted RL = 4Ω
A-weighted RL = 4Ω
85
60
Unweighted RL = 8Ω
A-weighted RL = 8Ω
86
62
Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
76
56
Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
82
60
)
s
(
ct
μVRMS
u
d
o
67
53
Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
e
t
e
ol
Pr
78
57
74
54
s
b
O
1. Standby mode is active when VSTBY is tied to GND.
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to
VCC at f = 217 Hz.
)
(s
t
c
u
d
o
r
P
e
t
e
l
o
s
b
O
13/49
Electrical characteristics
Table 11.
TS4961T
Electrical characteristics at VCC +2.4 V with GND = 0 V, Vicm = 1.2 V,
Tamb = 25° C (unless otherwise specified)
Symbol
Max.
Unit
mA
Standby current (1)
No input signal, VSTBY = GND
10
nA
Voo
Output offset voltage
No input signal, RL = 8Ω
3
mV
Pout
Output power, G=6dB
THD = 1% Max, f = 1kHz, RL = 4Ω
THD = 10% Max, f = 1kHz, RL = 4Ω
THD = 1% Max, f = 1kHz, RL = 8Ω
THD = 10% Max, f = 1kHz, RL = 8Ω
0.42
0.61
0.3
0.38
THD + N
Total harmonic distortion + noise
Pout = 150 mWRMS, G = 6dB, 20Hz < f < 20kHz
RL = 8Ω + 15µH, BW < 30kHz
Efficiency
Efficiency
Pout = 0.38 WRMS, RL = 4Ω + ≥ 15µH
Pout = 0.25 WRMS, RL = 8Ω+ ≥ 15µH
CMRR
Gain
)
(s
Gain value (Rin in kΩ)
t
c
u
Internal resistance from standby to GND
FPWM
Pulse width modulator base frequency
e
t
e
l
tWU
od
W
Pr
1
%
77
86
%
54
dB
273k Ω
----------------R
in
300k Ω
----------------R in
327k Ω
----------------R in
V/V
273
300
327
kΩ
280
kHz
Signal to noise ratio (A-weighting)
Pout = 0.25W, RL = 8Ω
80
dB
Wake-up time
5
ms
Standby time
5
ms
Pr
tSTBY
e
t
e
ol
s
b
O
)
s
(
ct
u
d
o
Common mode rejection ratio
f = 217Hz, RL = 8Ω, G = 6dB, ΔVic = 200mVpp
RSTBY
SNR
14/49
Typ.
1.7
ISTBY
O
Min.
Supply current
No input signal, no load
ICC
o
s
b
Parameter
TS4961T
Electrical characteristics
Table 11.
Electrical characteristics at VCC +2.4 V with GND = 0 V, Vicm = 1.2 V,
Tamb = 25° C (unless otherwise specified) (continued)
Symbol
Parameter
Min.
Typ.
Max.
Unit
Output voltage noise f = 20Hz to 20kHz, G = 6dB
VN
Unweighted RL = 4Ω
A-weighted RL = 4Ω
85
60
Unweighted RL = 8Ω
A-weighted RL = 8Ω
86
62
Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
76
56
Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
82
60
u
d
o
Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
67
53
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
e
t
e
ol
Pr
78
57
74
54
s
b
O
1. Standby mode is active when VSTBY is tied to GND.
)
(s
)
s
(
ct
μVRMS
t
c
u
d
o
r
P
e
t
e
l
o
s
b
O
15/49
Electrical characteristics
TS4961T
2.2
Analog switch section
Table 12.
DC specifications
Value
Symbol
Parameter
VCC (V)
Test conditions
Tamb = 25 °C
Min
VIH
High level input voltage
VIL
Low level input voltage
Typ
1.2
1.2
2.7 −3.0
1.3
1.3
3.3 −3.6
1.4
1.4
4.3
1.5
1.5
2.5
0.25
2.7 −3.0
0.25
3.3 −3.6
o
r
P
3.6
3.0
0.30
VS = 0 V to VCC
IS = 100 mA
2.7
)-
4.3
ON resistance match
between Tn channels(1)
c
u
d
Tn
RFLAT,
ON resistance flatness
for Tn channels(2)
e
t
e
ol
Tn
o
r
P
bs
OFF state leakage
current (Tn), (Dn)
ISEL
SEL leakage current
ICC
Quiescent supply
current
IOFF
O
ICCLV
Quiescent supply
current low voltage
driving
3.0
Max
b
O
VS at RPEAK
IS = 100 mA
)
s
(
ct
0.25
du
0.25
V
0.30
0.40
0.40
1.10
1.3
1.5
1.15
1.4
1.6
1.25
1.5
1.8
1.35
1.6
1.9
e
t
e
l
so
t(s
3.6
Ω
10
14
mΩ
14
2.7
15
4.3
0.45
0.50
0.55
0.45
0.50
0.55
0.50
0.55
0.60
0.55
0.60
0.70
VS = 0.3 or 4 V
±0.1
±1
µA
VSEL = 0 to 4.3 V
±0.05
±1
µA
VSEL = VCC or GND
±0.05
±0.2
µA
3.6
3.0
VS = 0 to VCC
IS = 100 mA
2.7
4.3
0 −4.3
2.4 −4.3
4.3
VSEL = 1.65 V
±37
±50
±100
VSEL = 1.80 V
±33
±40
±50
VSEL = 2.60 V
±12
±20
±30
1. ΔRON = RON(max) - RON(min).
2. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal ranges.
16/49
Unit
V
4.3
ΔRON,
Min
2.5
4.3
RPEAK, Switch Tn ON
resistance
Tn
Max
-40 to 85 °C
Ω
µA
TS4961T
Table 13.
Electrical characteristics
AC electrical characteristics (CL = 35 pF, RL = 50 Ω, tr = tf ≤5 ns)
Value
Symbol
Parameter
VCC (V)
Test conditions
Tamb = 25 °C
Min
tPLH, tPHL Propagation delay
0.30
3.6 −−4.3
0.30
2.5 −−2.7
65
85
90
42
55
3.6 −−4.3
40
55
2.5 −−2.7
18
30
16
30
)
s
(
ct
VS = 1.5 V
VS = 1.5 V
15
2.5 −−2.7
Charge injection
Max
3.0 −−3.3
3.6 −−4.3
Q
Min
0.45
3.0 −−3.3
Turn-OFF time
tOFF
Max
Unit
2.5 −−2.7
3.0 −−3.3
Turn-ON time
tON
Typ
-40 to 85 °C
3.0 −−3.3
CL = 100 pF
RL = 1 MΩ
VGEN = 0 V
RGEN = 0 Ω
3.6 −−4.3
)
(s
51
s
b
O
e
t
e
ol
51
ns
65
65
u
d
o
Pr
30
ns
40
40
ns
40
pC
49
t
c
u
d
o
r
P
e
t
e
l
o
s
b
O
17/49
Electrical characteristics
Table 14.
TS4961T
Analog switch characteristics (CL = 5 pF, RL = 50 Ω, Tamb = 25 °C)
Value
Symbol
Parameter
VCC (V)
Test conditions
Tamb = 25 °C
Min
OIRRTn
Off isolation for
switch T1,T2
2.5 −−4.3
Crosstalk between
XtalkTn
T1 and T2
BWTn
-3 dB bandwidth for
switch T1, T2
CSEL
Control pin input
capacitance
2.5 −− 4.3
2.5 −−4.3
Tn port capacitance
when the switch is
enabled
3.3
COFF,Tn
Tn port capacitance
when the switch is
disabled
3.3
t
e
l
o
s
b
O
18/49
-80
VS=1 Vrms,
F = 10 MHz,
RL = 50 Ω
-60
VS=1 Vrms,
F = 1 MHz
-85
VS=1 Vrms,
F = 10 MHz
-74
RL = 50 Ω
Signal = 0 dBm
58
)
(s
F = 1 MHz
Max
Min
Unit
Max
dB
)
s
(
ct
u
d
o
r
P
e
t
e
l
o
s
b
O
F = 1 MHz
t
c
u
d
o
r
P
e
VS=1 Vrms,
F=1 MHz,
RL = 50 Ω
VCC = 0 V
CON,Tn
Typ
-40 to 85 °C
dB
MHz
9
pF
113
pF
85
pF
TS4961T
Electrical characteristics curves
3
Electrical characteristics curves
3.1
Audio amplifier section
The graphs included in this section use the following abbreviations:
●
RL + 15 µH or 30 µH = pure resistor + very low series resistance inductor.
●
Filter = LC output filter (1 µF+30 µH for 4 Ω and 0.5 µF+6 0µH for 8 Ω).
●
All measurements done with Cs1 = 1 µF and Cs2 = 100 nF except for PSRR where Cs1
is removed.
Figure 1.
Test diagram for audio amplifier measurements
)
s
(
ct
Vcc
u
d
o
1uF
CSA
Cin
Rin
150k
Out+
In+
15uH or 30uH
In-
150k
)
(s
GND
d
o
r
RL
LC Filter
s
b
O
5th order
50kHz low pass
filter
Audio Measurement
t
c
u
Bandwidth < 30kHz
Test diagram for audio amplifier PSRR measurements
P
e
20Hz to 20kHz
let
100nF
Vcc
CSA
O
Rin
4.7uF
150k
Cin
4.7uF
In+
GND
VCCA
GND
Cin
Out+
Audio Amplifier
of the TS4961T
150k
15uH or 30uH
or
Rin
LC Filter
In-
GNDA
Figure 2.
o
s
b
or
Out-
GNDA
Rin
4 or 8 Ohms
t
e
l
o
Audio Amplifier
of the TS4961T
Cin
r
P
e
VCCA
GND
4 or 8 Ohms
5th order
RL
50kHz low pass
filter
Out-
GND
GND
5th order
50kHz low pass
Reference
RMS Selective Measurement
Bandwidth=1% of Fmeas
filter
19/49
Electrical characteristics curves
Figure 3.
TS4961T
Current consumption vs. power
supply voltage
Figure 4.
Current consumption vs. standby
voltage
No load
Tamb=25°C
Vcc = 3V
No load
Tamb=25°C
)
s
(
ct
Output offset voltage vs. common
mode input voltage
Figure 6.
r
P
e
Efficiency vs. output power
t
e
l
o
G = 6dB
Tamb = 25°C
Efficiency
)
(s
s
b
O
Power
Dissipation
t
c
u
Ω
od
r
P
e
μ
≤
t
e
l
o
Efficiency vs. output power
Figure 8.
s
b
O
Output power vs. power supply
voltage
3.5
Efficiency
Power
Dissipation
Ω
≥
μ
Output power (W)
3.0
Power Dissipation (mW)
Figure 7.
≥
2.5
RL = 4Ω + ≥ 15μH
F = 1kHz
BW < 30kHz
Tamb = 25°C
2.0
THD+N=10%
1.5
1.0
THD+N=1%
0.5
≤
0.0
20/49
2.5
3.0
3.5
Vcc (V)
4.0
Power Dissipation (mW)
Figure 5.
u
d
o
TS4961T
Electrical characteristics curves
Figure 9.
Output power (W)
2.0
Output power vs. power supply
voltage
Figure 10. PSSR vs. frequency
0
RL = 8Ω + ≥ 15μH
F = 1kHz
BW < 30kHz
Tamb = 25°C
1.5
-10
μ
-20
Ω
Δ
-30
THD+N=10%
μ
≤
°
-40
1.0
-50
0.5
-60
THD+N=1%
)
s
(
ct
-70
0.0
2.5
3.0
3.5
Vcc (V)
-80
4.0
-10
Δ
-30
-20
μ
bs
≤
O
)
-50
s
(
t
c
-60
-70
20
u
d
o
100
r
P
e
1000
10000 20k
let
Figure 13. PSSR vs. frequency
so
0
°
-40
-50
-60
-70
-80
20
100
1000
10000 20k
-10
Ω
≤
Ω
Δ
-30
-40
-40
-50
-50
-60
-60
-70
-70
100
μ
-20
μ
°
20
≤
0
μ
-20
Δ
μ
Ω
Figure 14. PSSR vs. frequency
-10
-30
Δ
-30
°
-40
-80
t
e
l
o
-10
μ
Ω
10000 20k
r
P
e
0
-20
1000
Figure 12. PSSR vs. frequency
0
b
O
100
u
d
o
Figure 11. PSSR vs. frequency
-80
20
1000
10000 20k
-80
μ
≤
°
20
100
1000
10000 20k
21/49
Electrical characteristics curves
TS4961T
Figure 15. PSSR vs. frequency
Figure 16. PSSR vs. common mode input
voltage
0
Vripple = 200mVpp
F = 217Hz, G = 6dB
RL ≥ 4Ω + ≥ 15μH
Tamb = 25°C
-10
μ
-20
Ω
Δ
-30
≤
°
-40
-50
-60
)
s
(
ct
-70
-80
20
100
1000
10000 20k
u
d
o
r
P
e
Figure 17. CMRR vs. common mode input
voltage
Figure 18. CMRR vs. frequency
t
e
l
o
ΔVicm = 200mVpp
F = 217Hz
G = 6dB
RL ≥ 4Ω + ≥ 15μH
Tamb = 25°C
)
(s
RL=4Ω + 15μH
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
s
b
O
Vcc=3.6V, 2.5V
t
c
u
d
o
r
20
P
e
t
e
l
o
Figure 19. CMRR vs. frequency
s
b
O
20
22/49
RL=4Ω + 30μH
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
20k
Figure 20. CMRR vs. frequency
RL=4Ω + Filter
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
Vcc=3.6V, 2.5V
20k
20
Vcc=3.6V, 2.5V
20k
TS4961T
Electrical characteristics curves
Figure 21. CMRR vs. frequency
RL=8Ω + 15μH
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
Figure 22. CMRR vs. frequency
RL=8Ω + 30μH
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
Vcc=3.6V, 2.5V
20
20k
r
P
e
RL = 4Ω + 15μH
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
t
e
l
o
)
(s
t
c
u
od
r
P
e
t
e
l
o
O
bs
s
b
O
Vcc=3.6V
Vcc=2.5V
20k
Figure 25. THD+N vs. output power
RL = 4Ω + 30μH or Filter
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
20k
Figure 24. THD+N vs. output power
Vcc=3.6V, 2.5V
20
)
s
(
ct
20
u
d
o
Figure 23. CMRR vs. frequency
RL=8Ω + Filter
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
Vcc=3.6V, 2.5V
3
Figure 26. THD+N vs. output power
RL = 8Ω + 15μH
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
Vcc=3.6V
Vcc=2.5V
3
Vcc=3.6V
Vcc=2.5V
2
23/49
Electrical characteristics curves
TS4961T
Figure 27. THD+N vs. output power
RL = 8Ω + 30μH or Filter
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
Figure 28. THD+N vs. output power
RL = 4Ω + 15μH
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
Vcc=3.6V
Vcc=2.5V
Vcc=3.6V
Vcc=2.5V
)
s
(
ct
2
u
d
o
Figure 29. THD+N vs. output power
RL = 4Ω + 30μH or Filter
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
Figure 30. THD+N vs. output power
r
P
e
RL = 8Ω + 15μH
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
t
e
l
o
Vcc=3.6V
Vcc=2.5V
)
(s
t
c
u
d
o
r
P
e
t
e
l
o
s
b
O
s
b
O
Vcc=3.6V
Vcc=2.5V
2
3
Figure 31. THD+N vs. output power
RL = 8Ω + 30μH or Filter
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
3
Figure 32. THD+N vs. frequency
RL=4Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
Vcc=3.6V
Vcc=2.5V
Po=0.35W
Po=0.17W
2
24/49
50
20k
TS4961T
Electrical characteristics curves
Figure 33. THD+N vs. frequency
RL=4Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
Figure 34. THD+N vs. frequency
RL=4Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
Po=0.35W
Po=0.85W
Po=0.42W
Po=0.17W
50
20k
20k
u
d
o
Figure 35. THD+N vs. frequency
RL=4Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
)
s
(
ct
50
Figure 36. THD+N vs. frequency
r
P
e
RL=8Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
t
e
l
o
Po=0.85W
)
(s
t
c
u
s
b
O
Po=0.18W
Po=0.1W
Po=0.42W
50
d
o
r
20k
P
e
Figure 37. THD+N vs. frequency
s
b
O
20k
Figure 38. THD+N vs. frequency
t
e
l
o
RL=8Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
50
RL=8Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
Po=0.18W
Po=0.45W
Po=0.1W
Po=0.22W
50
20k
50
20k
25/49
Electrical characteristics curves
TS4961T
Figure 39. THD+N vs. frequency
RL=8Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
Figure 40. Gain vs. frequency
Po=0.45W
Vcc=3.6V & 2.5V
RL=4Ω + 15μH
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
Po=0.22W
50
Figure 42. Gain vs. frequency
r
P
e
t
e
l
o
bs
Vcc=3.6V & 2.5V
O
)
s
(
t
c
du
20
20k
o
r
P
Figure 43. Gain vs. frequency
e
t
e
ol
s
b
O
20k
u
d
o
Figure 41. Gain vs. frequency
RL=4Ω + 30μH
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
26/49
Vcc= 3.6V & 2.5V
RL=4Ω + Filter
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
20
20k
Figure 44. Gain vs. frequency
Vcc= 3.6V & 2.5V
Vcc= 3.6V & 2.5V
RL=8Ω + 15μH
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
20
)
s
(
ct
20
20k
RL=8Ω + 30μH
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
20k
20
20k
TS4961T
Electrical characteristics curves
Figure 45. Gain vs. frequency
Figure 46. Gain vs. frequency
Vcc= 3.6V & 2.5V
Vcc= 3.6V & 2.5V
RL=8Ω + Filter
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
RL=No Load
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
20
20k
)
s
(
ct
20
20k
u
d
o
Figure 47. Startup & shutdown time VCC = 3 V, Figure 48. Startup & shutdown time VCC = 3 V,
G = 6 dB, Cin = 1 µF (5 ms/div)
G = 6 dB, Cin = 100 nF (5 ms/div)
r
P
e
t
e
l
o
Vo1
Vo1
Vo2
Vo2
Standby
)
(s
Vo1-Vo2
s
b
O
Standby
Vo1-Vo2
t
c
u
d
o
r
P
e
t
e
l
o
Figure 49. Startup & shutdown time VCC = 3 V,
G = 6 dB, no Cin (5 ms/div)
s
b
O
Vo1
Vo2
Standby
Vo1-Vo2
27/49
Electrical characteristics curves
3.2
TS4961T
Analog switch section
The graphs included in this section use the following abbreviations.
●
RL + 15 µH or 30 µH = pure resistor + very low series resistance inductor.
●
Filter = LC output filter (1 µF + 30 µH for 4 Ω and 0.5 µF + 6 0µH for 8 Ω).
●
All measurements done with Cs1 = 1 µF and Cs2 = 100 nF except for PSRR where Cs1
is removed.
Figure 50. Test diagram for switch measurements
Vcc
VCCS
CSS
GND
4 or 8 Ohms
D1
RL
Switch section
of the TS4961T
r
P
e
T2
D2
Vcc
Measurement
)-
Audio Amplifier
SL2
t
e
l
o
GNDS
s
b
O
GND
Audio Measurement
Bandwidth < 30kHz
s
(
t
c
u
d
o
Figure 51. Test diagram for isolation switch measurements
bs
O
Pr
Vcc
CSS
VCCS
e
t
e
ol
GND
100nF
D1
T1
RL
Switch section
of the TS4961T
T2
D2
SL1
GND
28/49
u
d
o
T1
SL1
SL2
)
s
(
ct
100nF
GNDS
GND
Measurement
Audio Measurement
Audio Amplifier
Bandwidth < 30kHz
TS4961T
Electrical characteristics curves
Figure 52. ON resistance
IDS
V
VCC
)
s
(
ct
T
D
u
d
o
VS
r
P
e
VCC
SEL
)
(s
t
c
u
Figure 53. OFF leakage
d
o
r
b
O
so
let
P
e
IT(Off)
A
t
e
l
o
s
b
O GND
VCC
ID(Off)
T
D
A
VD
VS
GND
SEL
GND
29/49
Electrical characteristics curves
TS4961T
Figure 54. OFF isolation
VCC
T
VOUT
D
VS
50:
GND
)
s
(
ct
u
d
o
SEL
r
P
e
GND
Figure 55. Bandwidth
VCC
)
(s
T
u
d
o
let
r
P
e
o
s
b
O
30/49
VCC
s
b
O
VOUT
D
ct
VS
t
e
l
o
50:
SEL
GND
TS4961T
Electrical characteristics curves
Figure 56. Switch-to-switch crosstalk
VCC
T1
D1
VS
VCC
50:
)
s
(
ct
u
d
o
SEL1
r
P
e D2
T2
t
e
l
o
VCC
SEL2
t
c
u
)
(s
d
o
r
VOUT
50:
s
b
O
GND
P
e
Figure 57. Test circuit
t
e
l
o
s
b
O
Note:
1
CL = 5/35 pF or equivalent (includes jig and probe capacitance).
2
RL = 50 Ω or equivalent.
3
RT = ZOUT of pulse generator (typically 50 Ω).
31/49
Electrical characteristics curves
TS4961T
Figure 58. Switching time and charge injection Figure 59. Switching time and charge injection
test circuit schematics
RL = 1 MΩ, CL = 100 pF
VCC
T
VOUT
D
RL
CL
)
s
(
ct
SEL
VIN
GND
Figure 60. Turn on, turn off time test circuit
schematics
u
d
o
r
P
e
Figure 61. Turn on, turn off time
t
e
l
o
VCC
T
VS
VOUT
D
)
(s
RL
SEL
t
c
u
d
o
r
VIN
GND
P
e
t
e
l
o
Figure 62. THD+N vs. output power
s
b
O
CL
s
b
O
RL = 4Ω
F = 100Hz
BW < 30kHz
Tamb = 25°C
Vcc=4.3V
Figure 63. THD+N vs. output power
RL = 8Ω
F = 100Hz
BW < 30kHz
Tamb = 25°C
Vcc=3.3V
Vcc=2.5V
32/49
Vcc=3.3V
Vcc=2.5V
Vcc=4.3V
TS4961T
Electrical characteristics curves
Figure 64. THD+N vs. output power
RL = 4Ω
F = 1kHz
BW < 30kHz
Tamb = 25°C
Figure 65. THD+N vs. output power
RL = 8Ω
F = 1kHz
BW < 30kHz
Tamb = 25°C
Vcc=4.3V
Vcc=3.3V
Vcc=4.3V
Vcc=3.3V
Vcc=2.5V
Vcc=2.5V
)
s
(
ct
u
d
o
Figure 66. THD+N vs. output power
RL = 4Ω
F = 10kHz
BW < 30kHz
Tamb = 25°C
Figure 67. THD+N vs. output power
RL = 8Ω
F = 10kHz
BW < 30kHz
Tamb = 25°C
r
P
e
t
e
l
o
Vcc=4.3V
Vcc=3.3V
Vcc=2.5V
s
b
O
Vcc=4.3V
Vcc=3.3V
Vcc=2.5V
)
(s
t
c
u
d
o
r
P
e
Figure 68. THD+N vs. frequency
t
e
l
o
s
b
O
50
Figure 69. THD+N vs. frequency
RL=4Ω
Vcc=2.5V
Bw < 30kHz
Tamb = 25°C
RL=8Ω
Vcc=2.5V
Bw < 30kHz
Tamb = 25°C
Po=10mW
Po=15mW
Po=2mW
Po=5mW
20k
50
20k
33/49
Electrical characteristics curves
TS4961T
Figure 70. THD+N vs. frequency
Figure 71. THD+N vs. frequency
RL=4Ω
Vcc=3.3V
Bw < 30kHz
Tamb = 25°C
Po=120mW
Po=230mW
Po=35mW
Po=50mW
Po=20mW
Po=10mW
50
20k
Figure 73. THD+N vs. frequency
Po=260mW
r
P
e
t
e
l
o
Po=420mW
bs
Po=90mW
O
)
s
(
t
c
du
50
20k
o
r
P
Figure 74. Isolation vs. frequency
s
b
O
Vcc=2.5V or 3.3V or 4.3V
Bw < 30kHz
Tamb = 25°C
RL=20kΩ
RL=100kΩ
RL=600Ω
RL=300Ω
RL=4Ω and 8Ω
20
34/49
20k
RL=4Ω
Vcc=4.3V
Bw < 30kHz
Tamb = 25°C
Po=30mW
)
s
(
ct
50
u
d
o
Figure 72. THD+N vs. frequency
e
t
e
ol
RL=8Ω
Vcc=3.3V
Bw < 30kHz
Tamb = 25°C
20k
RL=8Ω
Vcc=4.3V
Bw < 30kHz
Tamb = 25°C
Po=130mW
Po=50mW
50
20k
TS4961T
4
Application component information
Application component information
Table 15.
Component information
Component
Functional description
CSA
Bypass supply capacitor. Install as close as possible to the VCCA pin of the
TS4961T to minimize high-frequency ripple. A 1 uF ceramic capacitor should be
added to enhance power supply filtering at high frequencies (see below).
CSS
Bypass supply capacitor. Install as close as possible to the VCCS pin of the
TS4961T to minimize high-frequency ripple. A 100 nF ceramic capacitor should
be added to enhance power supply filtering at high frequencies.
RIN
Input resistor to program the TS4961T differential gain (gain = 300 kΩ/RIN with
RIN in kΩ).
CIN
Because common mode feedback is implemented, these input capacitors are
optional. However, they can be added to form with RIN a 1st order high pass filter
with a -3 dB cut-off frequency = 1/(2*π*RIN*CIN).
)
s
(
ct
u
d
o
r
P
e
Figure 75. Typical application schematics
t
e
l
o
CSA
2.4 to 4.3V
s
b
O
VCCA
)
(s
/STDBY
12
CIN
BB
b
O
so
let
r
P
e
CIN
GNDA
7
RIN IN+
t
c
u
od
6
16
15
RIN
TS4961T
5
Class D
Amplifier
8
IN-
SL1
SL2
D1
OUT+
OUT-
11
4
1
13
T1
4-8 ohms
CODEC
D2
2.4 to 4.3V
3
9
Analog Switch
2
VCCS
T2
7
GNDS
CSS
35/49
Application component information
4.1
TS4961T
Common mode feedback loop limitations
The common mode feedback loop allows the output DC bias voltage to be averaged at
VCC/2 for any DC common mode bias input voltage.
However, because of the Vicm limitation in the input stage (see Table 2: Operating conditions
for audio amplifier section on page 3), the common mode feedback loop can only fulfill its
role within a defined range. This range depends upon the values of VCC and Rin (Av). To
obtain a good estimation of the Vicm value, the following formula can be used (no tolerance
on Rin):
V CC × R in + 2 × V IC × 150kΩ
V icm = -----------------------------------------------------------------------------2 × ( R in + 150kΩ)
(V)
)
s
(
ct
with
+
-
In + In
V IC = --------------------2
u
d
o
(V)
r
P
e
and the result of the calculation must be in the range:
0.5V ≤ V icm ≤ V CC – 0.8V
t
e
l
o
Due to the +/-9% tolerance on the 150 kΩ resistor, it is also important to check Vicm in these
conditions:
s
b
O
V CC × R in + 2 × V IC × 136.5kΩ
V CC × R in + 2 × V IC × 163.5kΩ
----------------------------------------------------------------------------------- ≤ V icm ≤ ---------------------------------------------------------------------------------2 × ( R in + 136.5kΩ)
2 × ( R in + 163.5kΩ)
)
(s
If the result of the Vicm calculation is not in the previous range, input coupling capacitors
must be used (with VCC from 2.4 V to 2.5 V, input coupling capacitors are mandatory).
d
o
r
t
c
u
For example:
With VCC = 3 V, Rin = 150 kΩ and VIC = 2.5 V, we typically find Vicm = 2 V and this is lower
than 3 V - 0.8 V = 2.2 V. With 136.5 kΩ we find 1.97 V, and with 163.5 kΩ we have 2.02 V.
Therefore, no input coupling capacitors are required.
P
e
t
e
l
o
s
b
O
36/49
TS4961T
4.2
Application component information
Low frequency response
If a low frequency bandwidth limitation is required, it is possible to use input coupling
capacitors.
In the low frequency region, Cin (input coupling capacitor) starts to have an effect. Cin forms,
with Rin, a first order high-pass filter with a -3 dB cut-off frequency:
1
F CL = -------------------------------------2π × R in × C in
(Hz)
Therefore, for a desired cut-off frequency FCL, Cin is calculated as follows:
1
C in = ---------------------------------------2π × R in × F CL
(F)
with Rin in Ω and FCL in Hz.
4.3
)
s
(
ct
u
d
o
r
P
e
Decoupling of the circuit
A power supply capacitor, referred to as CS, is necessary to correctly bypass the class D
part of the TS4961T.
t
e
l
o
The TS4961T has a typical switching frequency at 250 kHz and an output fall and rise time
at approximately 5 ns. Because of these very fast transients, careful decoupling is
mandatory.
)
(s
s
b
O
A 1 µF ceramic capacitor is enough, but it must be located very close to the TS4961T in
order to avoid any extra parasitic inductance created by a long track wire. In relation with
dI/dt, this parasitic inductance introduces an overvoltage that decreases the global
efficiency and, if it is too high, may cause a breakdown of the device.
t
c
u
In addition, even if a ceramic capacitor has an adequate high frequency ESR value, its
current capability is also important. A 0603 size is a good compromise, particularly when a
4 Ω load is used.
d
o
r
P
e
Another important parameter is the rated voltage of the capacitor. A 1 µF/6.3 V capacitor
used at 5 V, loses about 50% of its value. In fact, with a 5 V power supply voltage, the
decoupling value is about 0.5 µF instead of 1 µF. Since CS has a particular influence on the
THD+N in the medium-high frequency region, this capacitor variation becomes decisive. In
addition, less decoupling means higher overshoots, which can be problematic if they reach
the power supply AMR value (6 V).
t
e
l
o
s
b
O
4.4
Wake-up time (tWU)
There is a wait of approximately 5 ms when standby is released to set the device ON. The
TS4961T has an internal digital delay that mutes the outputs and releases them after this
time in order to avoid any pop noise.
37/49
Application component information
4.5
TS4961T
Shutdown time (tSTBY)
When the standby command is set, the time required to put the two output stages into high
impedance and to put the internal circuitry in standby mode, is about 5 ms. This time is used
to decrease the gain and avoid any pop noise during shutdown.
4.6
Consumption in standby mode
Between the shutdown pin and GND there is an internal 300 kΩ resistor. This resistor forces
the TS4961T to switch to standby mode when the standby input is left floating.
However, this resistor also introduces additional power consumption if the standby pin
voltage is not 0 V.
4.7
)
s
(
ct
Single-ended input configuration
u
d
o
The TS4961Tcan be used in a single-ended input configuration, but input coupling
capacitors are necessary. Figure 76 shows a typical single-ended input application.
t
e
l
o
Figure 76. Typical single-ended input application
Standby
12 Stdby
s
(
t
c
Cin
GND
u
d
o
so
e
t
e
l
b
O
Pr
Cin
Rin
bs
O
)
Ve
GND
r
P
e
6
VCCA
16
5
Output
-
H
PWM
+
Rin
GND
Out+
150k
InIn+
Csa
1uF
Internal
Bias
300k
15
Vcc
Bridge
SPEAKER
150k
8
Out-
Oscillator
GNDA
TS4961T(Audio Amplifier Part)
7
GND
All formulas are identical except for the gain (with Rin in kΩ) :
AV
sin gle
Ve
- = 300
= --------------------------------------+
R in
Out – Out
Due to the internal resistor tolerance, AVsingle is in the range of:
273
327
---------- ≤ A V
≤ ---------sin gle
R in
R in
In the event that multiple single-ended inputs are summed, it is important that the
impedance on both TS4961 inputs (In- and In+) be equal.
38/49
TS4961T
Application component information
Figure 77. Typical application schematics with multiple single-ended inputs
Standby
Vcc
Vek
6
VCCA
Cink
Rink
12 Stdby
GND
300k
Ve1
Cin1
Rin1
16
5
Output
-
H
PWM
+
Req
Ceq
GND
Out+
150k
15
InIn+
GND
Csa
1uF
Internal
Bias
Bridge
SPEAKER
150k
8
)
s
(
ct
OutOscillator
GND
TS4961T (Audio Amplifier Part)
GNDA
7
u
d
o
GND
r
P
e
We have the following equations.
+
-
300
300
Out – Out = V e1 × ------------- + …+ V ek × ------------R in1
R ink
t
e
l
o
(V)
bs
k
C eq =
O
)
s
(
t
c
u
d
o
s
b
O
e
t
e
ol
Pr
C
inj
Σ Cinj
j=1
1
= ------------------------------------------------------2× π× R × F
inj
CLj
(F)
1 R eq = -----------------k
1
∑ --------Rinj
j =1
In general, for mixed situations (single-ended and differential inputs), the same rule must be
used, that is, to equalize impedance on both TS4961T inputs.
39/49
Application component information
4.8
TS4961T
Output filter considerations
The TS4961T is designed to operate without an output filter. However, due to very sharp
transients on the TS4961T output, EMI radiated emissions may cause some standard
compliance issues.
These EMI standard compliance issues can appear if the distance between the TS4961T
outputs and loudspeaker terminal are long (typically more than 50 mm, or 100 mm in both
directions, to the speaker terminals). Since the PCB layout and internal equipment device
are different for each configuration, it is difficult to provide a one-size-fits-all solution.
However, to decrease the probability of EMI issues, there are several simple rules to follow.
●
Reduce, as much as possible, the distance between the TS4961T output pins and the
speaker terminals.
●
Use ground planes for shielding sensitive wires.
●
Place, as close as possible to the TS4961T and in series with each output, a ferrite
bead with a rated current of 2.5 A minimum, and impedance greater than 50 Ω at
frequencies above 30 MHz. If, after testing, these ferrite beads are not necessary,
replace them by a short circuit.
●
Allow enough footprint to place, if necessary, a capacitor to short perturbations to
ground as shown in Figure 78.
)
s
(
ct
u
d
o
r
P
e
t
e
l
o
Figure 78. Output filter for shorting pertubations to ground
s
b
O
Ferrite chip bead
From TS4961T output
ct
)
(s
u
d
o
To speaker
about 100pF
Gnd
In the case where the distance between the TS4961T outputs and speaker terminals is high,
it is possible to have low frequency EMI issues due to the fact that the typical operating
frequency is 250 kHz.
r
P
e
In this configuration, it is recommended to use an output filter. It should be placed as close
as possible to the TS4961T.
t
e
l
o
s
b
O
40/49
TS4961T
Application component information
4.9
Examples with summed inputs
4.9.1
Example 1: dual differential inputs
Figure 79. Typical application schematics with dual differential inputs
Vcc
6
VCCA
Standby
12 Stdby
E2+
R2
Csa
1uF
Internal
Bias
300k
GND
Out+
E1+
R1
E1-
R1
15
InIn+
16
Output
-
Bridge
e
t
e
ol
R2
Oscillator
ct
u
d
o
s
b
O
e
t
e
ol
Pr
)
(s
Pr
SPEAKER
8
Out-
GNDA
7
s
b
O
TS4961T (Audio Amplifier Part)
With (Ri in kΩ):
u
d
o
H
PWM
+
150k
E2-
)
s
(
ct
5
150k
GND
+
-
– Out
300A V = Out
------------------------------- = --------1
+
R1
E1 – E1
+
-
Out – Out- = 300
A V = --------------------------------------2
+
R2
E2 – E2
V CC × R 1 × R 2 + 300 × ( V IC1 × R 2 + V IC2 × R 1 )
0.5V ≤ -------------------------------------------------------------------------------------------------------------------------------- ≤ V CC – 0.8V
300 × ( R 1 + R 2 ) + 2 × R 1 × R 2
+
-
+
-
E1 + E1
E2 + E2
V IC = -----------------------and V IC = -----------------------1
2
2
2
41/49
Application component information
4.9.2
TS4961T
Example 2: one differential input plus one single-ended input
Figure 80. Typical application schematics with one differential input plus one
single-ended input
Vcc
Standby
6
VCCA
12 Stdby
E2+
R2
300k
E1
15
R1
E2-
R2
16
5
H
PWM
r
P
e
R1
Out-
Oscillator
t
e
l
o
TS4961T (Audio Amplifier Part)
)
(s
t
c
u
od
t
e
l
o
s
b
O
42/49
u
d
o
Bridge
150k
With (Ri in kΩ):
)
s
(
ct
Output
InIn+ +
GND C1
GND
Out+
150k
C1
r
P
e
Csa
1uF
Internal
Bias
s
b
O
+
-
+
-
GNDA
7
GND
– Out- = --------300A V = Out
-----------------------------1
+
R1
E1
300
– Out- = --------A V = Out
-----------------------------2
+
R2
E2 – E2
1
C 1 = -------------------------------------2π × R 1 × F CL
(F)
8
SPEAKER
TS4961T
4.10
Application component information
Using the audio amplifier and switch on the same speaker
The TS4961T can be used to supply a speaker with two different sources. The typical
application is shown in Figure 81.
Figure 81. Typical application schematics for the TS4961T
CSA
2.4 to 4.3V
VCCA
CIN
Line
Out
Source
15
RIN
5
Class D
Amplifier
8
IN-
SL1
SL2
Speaker
Out
Source
TS4961T
7
RIN IN+
16
CIN
GNDA
6
/STDBY
12
D1
D2
OUT+
u
d
o
11
r
P
e
4
1
13
let
3
9
Analog Switch
2
VCCS
2.4 to 4.3V
)
(s
so
b
O
)
s
(
ct
OUT-
T1
4-8 ohms
T2
7
GNDS
CSS
The first source is a line-out signal provided by the baseband and the second is a
speaker-out signal coming from the CODEC. Switching is done through the standby pin
(/STDBY) of the audio amplifier and through the SLn pins of the switch.
t
c
u
d
o
r
Note that, as shown in Figure 82, all pins should not be switched at the same time because
this can cause damage to the TS4961T audio amplifier and to the external audio amplifier
that provides the speaker-out signal.
P
e
t
e
l
o
s
b
O
43/49
Application component information
TS4961T
Figure 82. Timing of switching between two audio sources
High
/STDBY
Low
t
High
SL1 & SL2
)
s
(
ct
Low
Status
Speaker
Connected to the
Line Out Source
Speaker
Connected to the
Speaker Out Source
e
t
e
ol
)
(s
t
c
u
d
o
r
P
e
t
e
l
o
s
b
O
44/49
u
d
o
Delay >1ms
Delay >10ms
Speaker
Not
Connected
s
b
O
Pr
Speaker
Connected to the
Line Out Source
t
TS4961T
5
Package information
Package information
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
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Package information
TS4961T
Figure 83. QFN16 3 x 3 mm package mechanical drawing
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Table 16.
Ref.
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QFN16 3 x 3 mm package mechanical data
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Dimensions
Millimeters
Inches
Min.
Typ.
Max.
Min.
Typ.
Max.
0.80
0.90
1.00
0.031
0.035
0.039
A1
0.02
0.05
0.001
0.002
A3
0.20
A
0.008
b
0.18
0.25
0.30
0.007
0.01
0.012
D
2.85
3.00
3.15
0.112
0.118
0.124
D1
1.50
0.059
D2
1.70
1.80
1.90
0.067
0.071
0.075
E
2.85
3.00
3.15
0.112
0.118
0.124
E1
1.50
0.059
E2
1.70
1.80
1.90
0.067
0.071
0.075
e
0.45
0.50
0.55
0.018
0.020
0.022
L
0.30
0.40
0.50
0.012
0.016
0.020
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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 pins 7 and
10 or left floating.
0.08
0.003
TS4961T
Package information
Figure 84. QFN16 3 x 3 mm package recommended footprint
MM
MM
MM
M M
M M
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M M
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The substrate pad should be tied to the PCB GND.
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Ordering information
6
TS4961T
Ordering information
Table 17.
Order codes
Order code
Temperature range
Package
Packing
Marking
-40°C to +85°C
QFN16
Tape & reel
K61T
TS4961TIQT
7
Revision history
Table 18.
Date
Revision
16-Sep-2008
1
Initial release.
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Changes
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Document revision history
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TS4961T
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