ANALOG DEVICES ADA4091-2 Service Manual
Micropower, Single-Supply, Rail-to-Rail
O
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FEATURES
Single-supply operation: 3 V to 36 V
Wide input voltage range
Rail-to-rail output swing
Low supply current: 250 μA/amp
Wide bandwidth: 1.2 MHz
Slew rate: 0.46 V/μs
Low offset voltage: 500 μV maximum
No phase reversal
APPLICATIONS
Industrial process control
Battery-powered instrumentation
Power supply control and protection
Telecommunications
Remote sensors
Low voltage strain gage amplifiers
DAC output amplifiers
GENERAL DESCRIPTION
The ADA4091-2 is a dual, micropower, single-supply, 1.2 MHz
bandwidth amplifier featuring rail-to-rail inputs and outputs.
It is guaranteed to operate from a +3 V single supply as well as
from ±15 V dual supplies.
The ADA4091 family of op amps features a unique input stage
that allows the input voltage to safely exceed either supply
without any phase inversion or latch-up. The output voltage
swings to within 10 mV of the supplies.
Applications for these amplifiers include portable telecommunications equipment, power supply control and protection,
and interface for transducers with wide output ranges. Sensors
requiring a rail-to-rail input amplifier include Hall effect, piezoelectric, and resistive transducers.
Input/Output Operational Amplifier
ADA4091-2
PIN CONFIGURATION
1
UTA
–INA
2
ADA4091-2
+INA
3
TOP VIEW
(Not to Scale)
–V
4
Figure 1. 8-Lead, Narrow Body SOIC
The ability to swing rail-to-rail at both the input and output
enables designers to build multistage filters in single-supply
systems and to maintain high signal-to-noise ratios.
The ADA4091 family of op amps is specified over the extended
industrial temperature range of −40°C to +125°C. The ADA4091-2
is part of a growing family of 36 V, low power op amps from
Analog Devices, Inc. (see Tabl e 1).
The ADA4091-2 is available in an 8-lead plastic SOIC surfacemount package.
Table 1. Low Power, 36 V Operational Amplifiers
Family Rail-to-Rail I/O PJFET Low Noise
Single OP1177
Dual ADA4091-2 AD8682 OP2177
Quad AD8684 OP4177
8
7
6
5
+V
OUTB
–INB
+INB
07671-001
Rev. 0
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
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2008 Analog Devices, Inc. All rights reserved.
ADA4091-2
www.BDTIC.com/ADI
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configuration ............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Electrical Specifications ............................................................... 3
Absolute Maximum Ratings ............................................................ 6
REVISION HISTORY
10/08—Revision 0: Initial Version
Thermal Resistance .......................................................................6
ESD Caution...................................................................................6
Typical Performance Characteristics ..............................................7
Theory of Operation ...................................................................... 13
Input Overvoltage Protection ................................................... 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 15
Rev. 0 | Page 2 of 16
ADA4091-2
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SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
VSY = ±1.5 V, VCM = 0.15 V, VO = 1.4 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS −500 +45 +500 μV
−40°C ≤ TA ≤ +125°C −1.0 +1.0 mV
Input Bias Current IB −50 +50 nA
−40°C ≤ TA ≤ +85°C −55 +55 nA
−40°C ≤ TA ≤ +125°C −275 +275 nA
Input Offset Current IOS −5 +5 nA
−40°C ≤ TA ≤ +85°C −5 +5 nA
−40°C ≤ TA ≤ +125°C −75 +75 nA
Input Voltage Range −1.5 +1.5 V
Common-Mode Rejection Ratio CMRR ±1.5 V < VSY ± 18 V 76 dB
−40°C ≤ TA ≤ +125°C 70 dB
Large Signal Voltage Gain AVO RL = 100 kΩ, VO = 0.3 V to 2.7 V 106 dB
−40°C ≤ TA ≤ +125°C 100 dB
R
−40°C ≤ TA ≤ +125°C 85 dB
Offset Voltage Drift ∆VOS/∆T 2.5 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH RL = 100 kΩ to GND 1.495 V
−40°C to +125°C 1.490 V
R
−40°C to +125°C 1.455 V
Output Voltage Low VOL RL = 100 kΩ to GND −1.498 V
−40°C to +125°C −1.498 V
R
−40°C to +125°C −1.491 V
Short-Circuit Limit ISC Sink/source = −40°C to +125°C ±31 mA
Open-Loop Impedance Z
POWER SUPPLY
Power Supply Rejection Ratio PSRR VSY = 2.7 V to 36 V 100 dB
−40°C ≤ TA ≤ +125°C 100 dB
Supply Current per Amplifier ISY IO = 0 mA 200 μA
−40°C ≤ TA ≤ +125°C 300 μA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 100 kΩ, CL = 30 pF 0.46 V/μs
Settling Time tS To 0.01% 22 μs
Gain Bandwidth Product GBP 1.22 MHz
Phase Margin ΦM 69 Degrees
NOISE PERFORMANCE
Voltage Noise en p-p 0.1 Hz to 10 Hz 2 μV p-p
Voltage Noise Density en f = 1 kHz 24 nV/√Hz
f = 1 MHz, AV = 1 102 Ω
OUT
= 10 kΩ, VO = 0.3 V to 2.7 V 93 dB
L
= 10 kΩ to GND 1.475 V
L
= 10 kΩ to GND −1.495 V
L
Rev. 0 | Page 3 of 16
ADA4091-2
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VO = ±5.0 V, −4.9 V ≤ VCM ≤ +4.9 V, TA = 25°C, unless otherwise noted.
Table 3.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS −500 +141 +500 μV
−40°C ≤ TA ≤ +125°C −1.0 +1.00 mV
Input Bias Current IB 30 60 nA
−40°C ≤ TA ≤ +125°C 150 nA
Input Offset Current IOS 2 nA
−40°C ≤ TA ≤ +125°C 30 nA
Input Voltage Range −5 +5 V
Common-Mode Rejection Ratio CMRR ±1.5 V < VSY ±18 V 88 dB
−40°C ≤ TA ≤ +125°C 82 dB
Large Signal Voltage Gain AVO RL = 100 kΩ, VO = ±4.7 V 113 dB
−40°C ≤ TA ≤ +125°C 103 dB
R
−40°C ≤ TA ≤ +125°C 87 dB
OUTPUT CHARACTERISTICS
Output Voltage High VOH RL = 100 kΩ to GND 4.980 4.990 V
−40°C to +125°C 4.980 V
R
–40°C ≤ TA ≤ +125°C 4.900 V
Output Voltage Low VOL RL = 100 kΩ to GND −4.990 V
−40°C to +125°C −4.980 V
R
–40°C ≤ TA ≤ +125°C −4.975 V
Short-Circuit Limit ISC Sink/source = −40°C to +125°C ±20 mA
Open-Loop Impedance Z
POWER SUPPLY
Power Supply Rejection Ratio PSRR VSY = 2.7 V to 36 V 100 dB
−40°C ≤ TA ≤ +125°C 100 dB
Supply Current per Amplifier ISY VO = 0 V 180 225 μA
−40°C ≤ TA ≤ +125°C 300 μA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 100 kΩ, CL = 30 pF 0.46 V/μs
Gain Bandwidth Product GBP 1.22 MHz
Phase Margin ΦM 70 Degrees
NOISE PERFORMANCE
Voltage Noise en p-p 0.1 Hz to 10 Hz 0.8 μV p-p
Voltage Noise Density en f = 1 kHz 24 nV/√Hz
f = 1 MHz, AV = 1 77 Ω
OUT
= 10 kΩ, VO = ±4.7 V 98 dB
L
=10 kΩ to GND 4.950 4.970 V
L
=10 kΩ to GND −4.980 V
L
Rev. 0 | Page 4 of 16
ADA4091-2
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VSY = ±15.0 V, −14.9 V ≤ VCM ≤ +14.9 V, TA = 25°C, unless otherwise noted.
Table 4.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS −500 +500 μV
−40°C ≤ TA ≤ +125°C −1.2 +1.20 mV
Input Bias Current IB −55 +55 nA
−40°C ≤ TA ≤ +85°C −80 +80 nA
−40°C ≤ TA ≤ +125°C −510 +510 nA
Input Offset Current IOS −2 +2 nA
−40°C ≤ TA ≤ +85°C −10 +10 nA
−40°C ≤ TA ≤ +125°C −140 +140 nA
Input Voltage Range −5 +5 V
Common-Mode Rejection Ratio CMRR ±1.5 V < VSY < ±18 V 95 dB
−40°C ≤ TA ≤ +125°C 90 dB
Large Signal Voltage Gain AVO RL = 100 kΩ, VO = ±14.7 V 116 dB
−40°C ≤ TA ≤ +125°C 106 dB
R
−40°C ≤ TA ≤ +125°C 92 dB
OUTPUT CHARACTERISTICS
Output Voltage High VOH R
−40°C to +125°C 14.950 V
R
–40°C ≤ TA ≤ +125°C 14.800 V
Output Voltage Low VOL RL = 100 kΩ to GND −14.990 V
−40°C to +125°C −1.4990 V
R
−40°C to +125°C −14.940 V
Short-Circuit Limit ISC Sink/source = −40°C to 125°C ±20 mA
Open-Loop Impedance Z
POWER SUPPLY
Power Supply Rejection Ratio PSRR VSY = 2.7 V to 36 V 100 dB
−40°C ≤ TA ≤ +125°C 100 dB
Supply Current per Amplifier ISY IO = 0 mA 250 μA
−40°C ≤ TA ≤ +125°C 350 μA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 100 kΩ, CL = 30 pF 0.46 V/μs
Gain Bandwidth Product GBP 1.27 MHz
Phase Margin ΦM 72 Degrees
Channel Separation CS f = 1 kHz 100 dB
NOISE PERFORMANCE
Voltage Noise en p-p 0.1 Hz to 10 Hz 0.8 μV p-p
Voltage Noise Density en f = 1 kHz 25 nV/√Hz
f = 1 MHz, AV = 1 71 Ω
OUT
= 10 kΩ, VO = ±14.7 V 102 dB
L
= 100 kΩ to GND 14.975 V
L
= 10 kΩ to GND 14.900 V
L
= 10 kΩ to GND −14.950 V
L
Rev. 0 | Page 5 of 16
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