Preliminary Technical Data
Quad Low Power, 3.6 MHz, Low Noise, Railto-Rail Output, Operational Amplifiers
ADA4691-4
FEATURES
Low power: 180 μA typical
Low distortion: 0.003% THD + N
Low noise: 16 nV/√Hz typical
3.6 MHz bandwidth
Offset voltage: 500 μV typical
Low offset voltage drift: 4 μV/°C maximum
Very low input bias currents: 0.5 pA typical
2.7 V to 5 V single supply or ±1.35 V to ±2.5 V dual supply
Available in very small 2 mm × 2mm LFCSP packages
PIN CONFIGURATION
APPLICATIONS
Photodiode amplifier
Sensor amplifier
Portable instrumentation
Portable medical devices
Portable audio: MP3, PDA, smart phone, notebook
Headphone speaker driver
Communications
Low-side current sense
ADC driver
Active filter
Sample-and-hold
Automotive sensors
Figure 1. 16-Lead LFCSP
GENERAL DESCRIPTION
The ADA4691-4 is a quad rail-to-rail output, single-supply
amplifier featuring low power, wide bandwidth, and low noise.
The ADA4691-4 has two independent shutdown pins, allowing
further reduction in supply current. These amplifiers are ideal
for a wide variety of applications. Audio preamps, filters,
IR/photodiode amplifiers, charge amps, and high impedance
sensors all benefit from this combination of performance
features. The ADA4692-4 is a quad version without shutdown in
a 14-lead TSSOP package.
Applications for these amplifiers include consumer audio
personal players with low noise and low distortion that provide
enough gain and slew rate response over the audio band at low
power. Industrial applications with high impedance sensors,
such as pyroelectric sensors and other IR sensors, benefit from
the high impedance input, low offset drift, and enough bandwidth and response for low gain applications.
The ADA4691-4 is specified over the extended industrial
temperature range (−40°C to +125°C). The ADA4691-4 is
available in a 16-lead LFCSP packages.
Rev. PrA
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
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Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.
Preliminary Technical Data
ADA4691-4
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—2.7 V OPERATION
VSY = 2.7 V, VCM = VSY/2, TA = 25°C, unless otherwise specified.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Symbol
Test Conditions/Comments
VOS
VCM = −0.3 V to +1.6 V
VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C
−40°C < TA < +125°C
Offset Voltage Drift
∆VOS/∆T
Input Bias Current
IB
Input Offset Current
IOS
Min
Typ
Max
Unit
0.5
2.5
4.0
4
mV
mV
µV/°C
5
360
5
225
+1.6
pA
pA
pA
pA
V
dB
dB
dB
dB
dB
dB
1
0.5
−40°C < TA < +125°C
Input Voltage Range
Common-Mode Rejection Ratio
CMRR
Large Signal Voltage Gain
AVO
Input Capacitance
Differential Mode
Common Mode
Logic High Voltage (Enabled)
Logic Low Voltage (Power-Down)
Logic Input Current (per Pin)
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Short-Circuit Current
Closed-Loop Output Impedance
Output Pin Leakage Current
POWER SUPPLY
Power Supply Rejection Ratio
CIN
CINDM
CINCM
VIH
VIL
IIN
VOH
VOL
ISC
ZOUT
PSRR
Supply Current Per Amplifier
ISY
Supply Current Shutdown Mode
ISD
1
−40°C < TA < +125°C
−40°C < TA < +125°C
VCM = −0.3 V to +1.6 V
VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C
RL = 2 kΩ, VOUT = 0.5 V to 2.2 V
−40°C < TA < +85°C
−40°C < TA < +125°C
RL = 600 Ω, VOUT = 0.5 V to 2.2 V
−0.3
70
62
90
80
67
85
90
100
95
2.5
7
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C, 0 V ≤ VSD ≤ 2.7 V
+1.6
RL = 2 kΩ to GND
−40°C < TA < +125°C
RL = 600 Ω to GND
−40°C < TA < +125°C
RL = 2 kΩ to VSY
−40°C < TA < +125°C
RL = 600 Ω to VSY
−40°C < TA < +125°C
VOUT = VSY or GND
f = 1 MHz, AV = −100
−40°C < TA < +125°C, shutdown active, VSD = VSS
2.65
2.6
2.55
2.5
VS = 2.7 V to 5.5 V
−40°C < TA < +125°C
VOUT = VSY/2
−40°C < TA < +125°C
All amplifiers shut down, VSD = VSS
−40°C < TA < +125°C
80
75
Rev. PrA | Page 2 of 5
0.5
1
2.67
2.59
24
78
30
40
95
125
±15
372
1
90
165
200
240
10
2
pF
pF
V
V
µA
V
V
V
V
mV
mV
mV
mV
mA
Ω
nA
dB
dB
µA
µA
nA
μA
ADA4691-4
Preliminary Technical Data
Parameter
DYNAMIC PERFORMANCE
Slew Rate
Symbol
Test Conditions/Comments
SR
Settling Time to 0.1%
Gain Bandwidth Product
Phase Margin
Turn-on, Turn-off Time
NOISE PERFORMANCE
Distortion
tS
GBP
ΦM
RL = 600 Ω, CL = 20 pF, AV = +1
RL = 2 kΩ, CL = 20 pF, AV = +1
Step = 0.5 V, RL = 2 kΩ, 600 Ω
RL = 1 MΩ, CL = 35 pF, AV = +1
RL = 1 MΩ, CL = 35 pF, AV = +1
RL = 600 Ω
1.1
1.4
1
3.6
49
1
V/µs
V/µs
μs
MHz
Degrees
µs
AV = −1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.15 V rms
0.009
%
AV = −1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.15 V rms
AV = +1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.15 V rms
AV = +1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.15 V rms
f = 0.1 Hz to 10 Hz
f = 1 kHz
f = 10 kHz
0.01
0.006
0.007
3.1
16
13
%
%
%
µV p-p
nV/√Hz
nV/√Hz
Voltage Noise
Voltage Noise Density
THD + N
en p-p
en
Min
Typ
Max
Unit
ELECTRICAL CHARACTERISTICS—5 V OPERATION
VSY = 5 V, VCM = VSY/2, TA = 25°C, unless otherwise specified.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Symbol
Test Conditions/Comments
VOS
Offset Voltage Drift
∆VOS/∆T
VCM = −0.3 V to +3.9 V
VCM = −0.1 V to +3.9 V; −40°C < TA < +125°C
−40°C < TA < +125°C
Input Bias Current
IB
Min
Typ
Max
Unit
0.5
2.5
4.0
4
mV
mV
µV/°C
5
360
5
260
+3.9
pA
pA
pA
pA
V
dB
dB
dB
dB
dB
dB
1
0.5
−40°C < TA < +125°C
Input Offset Current
IOS
Input Voltage Range
Common-Mode Rejection Ratio
CMRR
Large Signal Voltage Gain
AVO
Input Capacitance
Differential Mode
Common Mode
Logic High Voltage (Enabled)
Logic Low Voltage (Power-Down)
Logic Input Current (per Pin)
OUTPUT CHARACTERISTICS
Output Voltage High
CINDM
CINCM
VIH
VIL
IIN
VOH
1
−40°C < TA < +125°C
−40°C < TA < +125°C
VCM = −0.3 V to +3.9 V
VCM = −0.1 V to +3.9 V; −40°C < TA < +125°C
RL = 2 kΩ, VO = 0.5 V to 4.5 V, VCM = 0 V
−40°C < TA < +85°C
−40°C < TA < +125°C
RL = 600 Ω, VO = 0.5 V to 4.5 V, VCM = 0 V
−0.3
75
68
95
80
75
90
98
110
100
2.5
7
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C, 0 V ≤ VSD ≤ 2.7 V
+2.0
RL = 2 kΩ
−40°C ≤ TA ≤ +125°C
RL = 600 Ω to GND
−40°C ≤ TA ≤ +125°C
4.95
4.90
4.85
4.80
Rev. PrA | Page 3 of 5
0.8
1
4.97
4.88
pF
pF
V
V
µA
V
V
V
V
Preliminary Technical Data
Parameter
Output Voltage Low
Short-Circuit Limit
Closed-Loop Output Impedance
Output Pin Leakage Current
POWER SUPPLY
Power Supply Rejection Ratio
Symbol
VOL
ISC
ZOUT
PSRR
Supply Current per Amplifier
ISY
Supply Current Shutdown Mode
ISD
DYNAMIC PERFORMANCE
Slew Rate
Settling Time to 0.1%
Gain Bandwidth Product
Phase Margin
Turn-on, Turn-off Time
NOISE PERFORMANCE
Distortion
Voltage Noise
Voltage Noise Density
ADA4691-4
Test Conditions/Comments
RL = 2 kΩ
−40°C ≤ TA ≤ +125°C
RL = 600 Ω
−40°C ≤ TA ≤ +125°C
VOUT = VSY or GND
ADA4691-2, f = 1 MHz, AV = −100
ADA4691-2, f = 1 MHz, AV = −100
−40°C < TA < +125°C, shutdown active, VSD = VSS
Min
VSY = 2.7 V to 5.5 V
−40°C ≤ TA ≤ +125°C
VOUT = VSY/2
−40°C ≤ TA ≤ +125°C
All amplifiers shutdown, VSD = VSS
−40°C ≤ TA ≤ +125°C
80
75
Typ
28
90
Max
35
50
110
145
±55
364
246
1
90
180
225
275
10
2
Unit
mV
mV
mV
mV
mA
Ω
Ω
nA
dB
dB
µA
µA
nA
uA
SR
tS
GBP
ΦM
RL = 2 kΩ, 600 Ω, CL = 20 pF, AV = +1
VIN = 2 V step, RL = 2 kΩ or 600 Ω
RL = 1 MΩ, CL = 35 pF, AV = +1
RL = 1 MΩ, CL = 35 pF, AV = +1
RL = 600 Ω
1.3
1.5
3.6
52
1
V/µs
μs
MHz
Degrees
µs
THD + N
AV = −1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.8 V rms
0.008
%
en p-p
en
en
AV = −1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.8 V rms
AV = +1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.8 V rms
AV = +1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.8 V rms
f = 0.1 Hz to 10 Hz
f = 1 kHz
f = 10 kHz
0.006
0.003
0.001
3.2
16
13
%
%
%
µV p-p
nV/√Hz
nV/√Hz
Rev. PrA | Page 4 of 5
ADA4691-4
Preliminary Technical Data
ABSOLUTE MAXIMUM RATINGS
THERMAL RESISTANCE
Table 3.
Parameter
Supply Voltage
Input Voltage
Input Current1
Shutdown Pin Rise/Fall Times
Differential Input Voltage2
Output Short-Circuit Duration to GND
Temperature
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
6V
VSS − 0.3 V to VDD + 0.3 V
±10 mA
50 µs maximum
±VSY
Indefinite
−65°C to +150°C
−40°C to +125°C
−65°C to +150°C
300°C
1
Input pins have clamp diodes to the supply pins. Limit the input current to
10 mA or less whenever the input signal exceeds the power supply rail by 0.3 V.
2
Differential input voltage is limited to 5 V or the supply voltage, whichever
is less.
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages and
measured using a standard 4-layer board, unless otherwise
specified.
Table 4. Thermal Resistance
Package Type
8-Lead SOIC_N (R-8)
8-Lead LFCSP (CP-8-6)
9-Ball WLCSP (CB-9-3)
10-Lead LFCSP (CP-10-11)
14-Lead TSSOP (RU-14)
16-Lead LFCSP
ESD CAUTION
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
©2009 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
PR08641-0-10/09(PrA)
Rev. PrA | Page 5 of 5
θJA
155
115
77
132
112
TBD
θJC
45
40
N/A
46
35
TBD
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W