ANALOG DEVICES ADA4691-2, ADA4691-4, ADA4692-2, ADA4692-4 Service Manual
Low Power, 3.6 MHz, Low Noise, Rail-to-
–
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4
FEATURES
Low power: 180 μA typical
Very low input bias currents: 0.5 pA typical
Low noise: 16 nV/√Hz typical
3.6 MHz bandwidth
Offset voltage: 500 μV typical
Low offset voltage drift: 4 μV/°C maximum
Low distortion: 0.003% THD + N
2.7 V to 5 V single supply or ±1.35 V to ±2.5 V dual supply
Available in very small 2 mm × 2 mm LFCSP packages
APPLICATIONS
Photodiode amplifiers
Sensor amplifiers
Portable medical and instrumentation
Portable audio: MP3s, PDAs, and smartphones
Communications
Low-side current sense
ADC drivers
Active filters
Sample-and-hold
GENERAL DESCRIPTION
The ADA4691-2/ADA4692-2 are dual and the ADA4691-4/
ADA4692-4 are the quad rail-to-rail output, single-supply
amplifiers featuring low power, wide bandwidth, and low noise.
The ADA4691-2 has two independent shutdown pins, allowing
further reduction in supply current. The ADA4691-4 is a quad
with dual shutdown pins each controlling a pair of amplifiers
and is available in the 16-lead LFCSP. The ADA4692-4 is a quad
version without shutdown.
These amplifiers are ideal for a wide variety of applications.
Audio, filters, photodiode amplifiers, and charge amplifiers, all
benefit from this combination of performance and features.
Additional applications for these amplifiers include portable
consumer audio players with low noise and low distortion that
provide high gain and slew rate response over the audio band at
low power. Industrial applications with high impedance sensors,
such as pyroelectric and IR sensors, benefit from the high
impedance and low 0.5 pA input bias, low offset drift, and
enough bandwidth and response for low gain applications.
Rail Output, Operational Amplifiers
The ADA4691/ADA4692 family is fully specified over the extended
industrial temperature range (−40°C to +125°C). e ADA4691-2
is available in a 10-lead LFCSP and a 9-ball WLCSP. The ADA4692-2
is available in an 8-lead SOIC and 8-lead LFCSP. The ADA4691-4 is
available in a 16-lead LFCSP. The ADA4692-4 is available in a 14-lead
TSSOP. For pin configurations, see the Pin Configurations section.
1
ADA4692-2
V
= ±2.5V
SY
A
= –1
V
T
= 25°C
A
0.1
RL = 600Ω
THD + N (%)
0.01
0.001
10 100 1k 10k 20k
Figure 1. THD + Noise vs. Frequency
80
ADA4692-2
V
= ±2.5V
SY
V
= 2.8V p- p
IN
–90
A
= +1
V
T
= 25°C
A
–100
–110
–120
CHANNEL SEPARATI ON (dB)
–130
–140
100 1k 10k 100k
Figure 2. Channel Separation vs. Frequency
FREQUENCY (Hz)
FREQUENCY (Hz)
R
= 2kΩ
L
07950-142
07950-141
Table 1.
Micropower Low Power Low Power with Shutdown Standard Op Amp With Shutdown High Bandwidth
Single AD8613 AD8591 AD8691
Dual AD8617 ADA4692-2 ADA4691-2 AD8592 AD8692
Quad AD8619 ADA4692-4 ADA4691-4 AD8594 AD8694
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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
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Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2009–2010 Analog Devices, Inc. All rights reserved.
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4
TABLE OF CONTENTS
Features.............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics—2.7 V Operation ............................ 3
Electrical Characteristics—5 V Operation................................ 4
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
REVISION HISTORY
11/10—Rev. C to Rev. D
Changed 5 V to 6 V in Endnote 2, Table 4 .................................... 6
12/09—Rev. B to Rev. C
Added ADA4691-4, 16-Lead LFCSP ..........................Throughout
Added Figure 1, Figure 2, and Table 1; Renumbered
Sequentially ....................................................................................... 1
Changes to Applications Section and General Description
Section................................................................................................ 1
Changes to Table 1............................................................................ 3
Changes to Table 2............................................................................ 4
Changes to Table 4............................................................................ 6
Updated Outline Dimensions....................................................... 17
Changes to Ordering Guide.......................................................... 20
9/09—Rev. A to Rev. B
Added ADA4691-2, 9-Ball WLCSP; ADA4692-2, 8-Lead
LFCSP; and ADA4692-4, 14-Lead TSSOP................. Throughout
Changes to General Description .................................................... 1
Updated Outline Dimensions....................................................... 16
Changes to Ordering Guide.......................................................... 17
ESD Caution...................................................................................6
Pin Configurations............................................................................7
Typical Performance Characteristics..............................................8
Shutdown Operation...................................................................... 16
Input Pin Characteristics........................................................... 16
Input Threshold.......................................................................... 16
Outline Dimensions....................................................................... 17
Ordering Guide .......................................................................... 20
6/09—Rev. 0 to Rev. A
Added ADA4691-2, 10 Lead LFCSP........................... Throughout
Changes to Table 1.............................................................................3
Changes to Table 2.............................................................................4
Changes to Captions for Figure 40, Figure 41, Figure 43, and
Figure 44 .......................................................................................... 13
Added Shutdown Operations Section ......................................... 15
Updated Outline Dimensions....................................................... 16
Changes to Ordering Guide.......................................................... 16
3/09—Revision 0: Initial Version
Rev. D | Page 2 of 20
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—2.7 V OPERATION
VSY = 2.7 V, VCM = VSY/2, TA = 25°C, unless otherwise specified.
Table 2.
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS V
Dual (ADA469x-2) VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C 3.5 mV
Quad (ADA469x-4) VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C 4.0 mV
Offset Voltage Drift ΔVOS/ΔT −40°C < TA < +125°C 1 4 μV/°C
Input Bias Current IB 0.5 5 pA
−40°C < TA < +125°C 360 pA
Input Offset Current IOS 1 8 pA
−40°C < TA < +125°C 225 pA
Input Voltage Range −40°C < TA < +125°C −0.3 +1.6 V
Common-Mode Rejection Ratio CMRR VCM = −0.3 V to +1.6 V 70 90 dB
V
Large Signal Voltage Gain AVO R
−40°C < TA < +85°C 80 dB
−40°C < TA < +125°C 63 dB
R
Input Capacitance CIN
Differential Mode C
Common Mode C
2.5 pF
INDM
7 pF
INCM
Logic High Voltage (Enabled) VIH −40°C < TA < +125°C 1.6 V
Logic Low Voltage (Power-Down) VIL −40°C < TA < +125°C 0.5 V
Logic Input Current (Per Pin) IIN −40°C < TA < +125°C, 0 V ≤ VSD ≤ 2.7 V 1 μA
OUTPUT CHARACTERISTICS
Output Voltage High VOH R
−40°C < TA < +125°C 2.6 V
R
−40°C < TA < +125°C 2.5 V
Output Voltage Low VOL R
−40°C < TA < +125°C 40 mV
R
−40°C < TA < +125°C 130 mV
Short-Circuit Current ISC V
Closed-Loop Output Impedance Z
f = 1 MHz, AV = −100 372 Ω
OUT
Output Pin Leakage Current −40°C < TA < +125°C, shutdown active, VSD = VSS 10 nA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 80 90 dB
−40°C < TA < +125°C 75 dB
Supply Current Per Amplifier ISY V
−40°C < TA < +125°C 240 μA
Supply Current Shutdown Mode ISD All amplifiers shut down, VSD = V
−40°C < TA < +125°C 2 μA
= −0.3 V to +1.6 V 0.5 2.5 mV
CM
= −0.1 V to +1.6 V; −40°C < TA < +125°C 62 dB
CM
= 2 kΩ, V
L
= 600 Ω, V
L
= 2 kΩ to GND 2.65 2.67 V
L
= 600 Ω to GND 2.55 2.59 V
L
= 2 kΩ to VSY 24 30 mV
L
= 600 Ω to VSY 78 95 mV
L
= VSY or GND ±15 mA
OUT
= VSY/2 165 200 μA
OUT
= 0.5 V to 2.2 V 90 100 dB
OUT
= 0.5 V to 2.2 V 85 95 dB
OUT
10 nA
SS
Rev. D | Page 3 of 20
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
DYNAMIC PERFORMANCE
Slew Rate SR RL = 600 Ω, CL = 20 pF, AV = +1 1.1 V/μs
R
Settling Time to 0.1% tS Step = 0.5 V, RL = 2 kΩ, 600 Ω 1 μs
Gain Bandwidth Product GBP RL = 1 MΩ, CL = 35 pF, AV = +1 3.6 MHz
Phase Margin ΦM R
Turn- On/Tu rn-Off Time RL = 600 Ω 1 μs
NOISE PERFORMANCE
Distortion THD + N AV = −1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.15 V rms 0.009 %
A
Voltage Noise en p-p f = 0.1 Hz to 10 Hz 3.1 μV p-p
Voltage Noise Density en f = 1 kHz 16 nV/√Hz
f = 10 kHz 13 nV/√Hz
ELECTRICAL CHARACTERISTICS—5 V OPERATION
VSY = 5 V, VCM = VSY/2, TA = 25°C, unless otherwise specified.
Table 3.
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS V
Dual (ADA469x-2) VCM = −0.1 V to +3.9 V; −40°C < TA < +125°C 3.5 mV
Quad (ADA469x-4) VCM = −0.1 V to +3.9 V; −40°C < TA < +125°C 4.0 mV
Offset Voltage Drift ΔVOS/ΔT −40°C < TA < +125°C 1 4 μV/°C
Input Bias Current IB 0.5 5 pA
−40°C < TA < +125°C 360 pA
Input Offset Current IOS 1 8 pA
−40°C < TA < +125°C 260 pA
Input Voltage Range −40°C < TA < +125°C −0.3 +3.9 V
Common-Mode Rejection Ratio CMRR VCM = −0.3 V to +3.9 V 75 98 dB
V
Large Signal Voltage Gain AVO R
−40°C < TA < +85°C 80 dB
−40°C < TA < +125°C 70 dB
R
Input Capacitance
Differential Mode C
Common Mode C
Logic High Voltage (Enabled) VIH −40°C < TA < +125°C 2.0 V
Logic Low Voltage (Power-Down) VIL −40°C < TA < +125°C 0.8 V
Logic Input Current (Per Pin) IIN −40°C < TA < +125°C, 0 V ≤ VSD ≤ 2.7 V 1 μA
2.5 pF
INDM
7 pF
INCM
= 2 kΩ, CL = 20 pF, AV = +1 1.4 V/μs
L
= 1 MΩ, CL = 35 pF, AV = +1 49 Degrees
L
= −1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.15 V rms 0.01
A
V
= +1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.15 V rms 0.006 %
V
= +1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.15 V rms 0.009
A
V
= −0.3 V to +3.9 V 0.5 2.5 mV
CM
= −0.1 V to +3.9 V; −40°C < TA < +125°C 68 dB
CM
= 2 kΩ, VO = 0.5 V to 4.5 V, VCM = 0 V 95 110 dB
L
= 600 Ω, VO = 0.5 V to 4.5 V, VCM = 0 V 90 100 dB
L
%
%
Rev. D | Page 4 of 20
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
OUTPUT CHARACTERISTICS
Output Voltage High VOH R
−40°C ≤ TA ≤ +125°C 4.90 V
R
−40°C ≤ TA ≤ +125°C 4.80 V
Output Voltage Low VOL R
−40°C ≤ TA ≤ +125°C 50 mV
R
−40°C ≤ TA ≤ +125°C 155 mV
Short-Circuit Limit ISC V
Closed-Loop Output Impedance Z
ADA4691-2, f = 1 MHz, AV = −100 364 Ω
OUT
ADA4691-2, f = 1 MHz, AV = −100 246 Ω
Output Pin Leakage Current −40°C < TA < +125°C, shutdown active, VSD = VSS 10 nA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VSY = 2.7 V to 5.5 V 80 90 dB
−40°C ≤ TA ≤ +125°C 75 dB
Supply Current Per Amplifier ISY V
−40°C ≤ TA ≤ +125°C 275 μA
Supply Current Shutdown Mode ISD All amplifiers shut down, VSD = V
−40°C ≤ TA ≤ +125°C 2 μA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ, 600 Ω, CL = 20 pF, AV = +1 1.3 V/μs
Settling Time to 0.1% tS V
Gain Bandwidth Product GBP RL = 1 MΩ, CL = 35 pF, AV = +1 3.6 MHz
Phase Margin ΦM R
Turn- On/Tu rn-Off Time RL = 600 Ω 1 μs
NOISE PERFORMANCE
Distortion THD + N AV = −1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.8 V rms 0.006 %
Voltage Noise en p-p f = 0.1 Hz to 10 Hz 3.2 μV p-p
Voltage Noise Density en f = 1 kHz 16 nV/√Hz
e
f = 10 kHz 13 nV/√Hz
n
= 2 kΩ 4.95 4.97 V
L
= 600 Ω to GND 4.85 4.88 V
L
= 2 kΩ 30 35 mV
L
= 600 Ω 100 110 mV
L
= VSY or GND ±55 mA
OUT
= VSY/2 180 225 μA
OUT
10 nA
SS
= 2 V step, RL = 2 kΩ or 600 Ω 1.5 μs
IN
= 1 MΩ, CL = 35 pF, AV = +1 52 Degrees
L
= −1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.8 V rms 0.008 %
A
V
= +1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.8 V rms 0.001 %
A
V
= +1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.8 V rms 0.003 %
A
V
Rev. D | Page 5 of 20
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4
ABSOLUTE MAXIMUM RATINGS
Table 4.
Parameter Rating
Supply Voltage 6 V
Input Voltage VSS − 0.3 V to VDD + 0.3 V
Input Current1 ±10 mA
Shutdown Pin Rise/Fall Times 50 μs maximum
Differential Input Voltage2 ±VSY
Output Short-Circuit Duration to GND Indefinite
Temperature
Storage Temperature Range −65°C to +150°C
Operating Temperature Range −40°C to +125°C
Junction Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 60 sec) 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 6 V or the supply voltage, whichever
is less.
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.
THERMAL RESISTANCE
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 5. Thermal Resistance
Package Type θJA θ
8-Lead SOIC_N (R-8) 120 45 °C/W
8-Lead LFCSP (CP-8-6) 125 40 °C/W
9-Ball WLCSP (CB-9-3) 77 N/A1 °C/W
10-Lead LFCSP (CP-10-11) 115 40 °C/W
16-Lead LFCSP (CP-16-22) 75 12 °C/W
14-Lead TSSOP (RU-14) 112 35 °C/W
1
N/A = not applicable.
ESD CAUTION
Unit
JC
Rev. D | Page 6 of 20
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