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Precision CMOS, Single-Supply, Rail-to-Rail,
Input/Output Wideband Operational Amplifiers
AD8601/AD8602/AD8604
FEATURES
Low offset voltage: 500 μV maximum
Single-supply operation: 2.7 V to 5.5 V
Low supply current: 750 μA/Amplifier
Wide bandwidth: 8 MHz
Slew rate: 5 V/μs
Low distortion
No phase reversal
Low input currents
Unity-gain stable
Qualified for automotive applications
APPLICATIONS
Current sensing
Barcode scanners
PA controls
Battery-powered instrumentation
Multipole filters
Sensors
ASIC input or output amplifiers
Audio
GENERAL DESCRIPTION
The AD8601, AD8602, and AD8604 are single, dual, and quad
rail-to-rail, input and output, single-supply amplifiers featuring
very low offset voltage and wide signal bandwidth. These amplifiers
use a new, patented trimming technique that achieves superior
performance without laser trimming. All are fully specified to
operate on a 3 V to 5 V single supply.
The combination of low offsets, very low input bias currents,
and high speed make these amplifiers useful in a wide variety
of applications. Filters, integrators, diode amplifiers, shunt
current sensors, and high impedance sensors all benefit from
the combination of performance features. Audio and other ac
applications benefit from the wide bandwidth and low distortion.
For the most cost-sensitive applications, the D grades offer this
ac performance with lower dc precision at a lower price point.
Applications for these amplifiers include audio amplification for
portable devices, portable phone headsets, bar code scanners,
portable instruments, cellular PA controls, and multipole filters.
The ability to swing rail-to-rail at both the input and output
enables designers to buffer CMOS ADCs, DACs, ASICs, and
other wide output swing devices in single-supply systems.
PIN CONFIGURATIONS
OUT A 1
5 V+
AD8601
V– 2 TOP VIEW
(Not to Scale)
+IN 3
4 –IN
Figure 1. 5-Lead SOT-23 (RJ Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
AD8602
TOP VIEW
(Not to Scale)
8 V+
7 OUT B
6 –IN B
5 +IN B
Figure 2. 8-Lead MSOP (RM Suffix) and 8-Lead SOIC (R-Suffix)
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
14 OUT D
13 –IN D
AD8604
TOP VIEW
(Not to Scale)
12 +IN D
11 V–
10 +IN C
9 –IN C
8 OUT C
Figure 3. 14-Lead TSSOP (RU Suffix) and 14-Lead SOIC (R Suffix)
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
NC 8
16 OUT D
AD8604
TOP VIEW
(Not to Scale)
15 –IN D
14 +IN D
13 V–
12 +IN C
11 –IN C
10 OUT C
9 NC
NC = NO CONNECT
Figure 4. 16-Lead Shrink Small Outline QSOP (RQ Suffix)
The AD8601, AD8602, and AD8604 are specified over the
extended industrial (−40°C to +125°C) temperature range. The
AD8601, single, is available in a tiny, 5-lead SOT-23 package. The
AD8602, dual, is available in 8-lead MSOP and 8-lead, narrow
SOIC surface-mount packages. The AD8604, quad, is available
in 14-lead TSSOP, 14-lead SOIC, and 16-lead QSOP packages.
See the Ordering Guide for automotive grades.
Rev. G
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.
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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 ©2000–2011 Analog Devices, Inc. All rights reserved.

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AD8601/AD8602/AD8604
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Pin Configurations ........................................................................... 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Electrical Characteristics............................................................. 3 
Absolute Maximum Ratings............................................................ 5 
Thermal Resistance ...................................................................... 5 
ESD Caution.................................................................................. 5 
Typical Performance Characteristics ............................................. 6 
Theory of Operation ...................................................................... 15 
Rail-to-Rail Input Stage ............................................................. 15 
REVISION HISTORY
1/11—Rev. F to Rev. G
Changes to Ordering Guide .......................................................... 22
Change to Automotive Products Section .................................... 22
5/10—Rev. E to Rev. F
Changes to Features Section and General Description
Section................................................................................................ 1
Changes to Ordering Guide .......................................................... 22
Added Automotive Products Section .......................................... 22
2/10—Rev. D to Rev. E
Add 16-Lead QSOP............................................................Universal
Changes to Table 3 and Table 4....................................................... 5
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 22
Input Overvoltage Protection ................................................... 16 
Overdrive Recovery ................................................................... 16 
Power-On Time .......................................................................... 16 
Using the AD8602 in High Source Impedance
Applications ................................................................................ 16 
High Side and Low Side, Precision Current Monitoring ...... 16 
Using the AD8601 in Single-Supply, Mixed Signal
Applications ................................................................................ 17 
PC100 Compliance for Computer Audio Applications ........ 17 
SPICE Model............................................................................... 18 
Outline Dimensions ....................................................................... 19 
Ordering Guide .......................................................................... 22 
Automotive Products ................................................................. 22 
11/03—Rev. C to Rev. D
Changes to Features ..........................................................................1
Changes to Ordering Guide .............................................................4
3/03—Rev. B to Rev. C
Changes to Features ..........................................................................1
3/03—Rev. A to Rev. B
Change to Features ............................................................................1
Change to Functional Block Diagrams...........................................1
Change to TPC 39 .......................................................................... 11
Changes to Figures 4 and 5 ........................................................... 14
Changes to Equations 2 and 3................................................. 14, 15
Updated Outline Dimensions....................................................... 16
Rev. G | Page 2 of 24

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AD8601/AD8602/AD8604
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
VS = 3 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage (AD8601/AD8602)
Offset Voltage (AD8604)
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
Symbol Conditions
VOS 0 V ≤ VCM ≤ 1.3 V
−40°C ≤ TA ≤ +85°C
−40°C ≤ TA ≤ +125°C
0 V ≤ VCM ≤ 3 V1
−40°C ≤ TA ≤ +85°C
−40°C ≤ TA ≤ +125°C
VOS VCM = 0 V to 1.3 V
−40°C ≤ TA ≤ +85°C
−40°C ≤ TA ≤ +125°C
VCM = 0 V to 3.0 V1
−40°C ≤ TA ≤ +85°C
−40°C ≤ TA ≤ +125°C
IB
−40°C ≤ TA ≤ +85°C
−40°C ≤ TA ≤ +125°C
IOS
−40°C ≤ TA ≤ +85°C
−40°C ≤ TA ≤ +125°C
CMRR
AVO
ΔVOS/ΔT
VCM = 0 V to 3 V
VO = 0.5 V to 2.5 V,
RL = 2 kΩ, VCM = 0 V
VOH
VOL
IOUT
ZOUT
PSRR
ISY
SR
tS
GBP
Φo
IL = 1.0 mA
–40°C ≤ TA ≤ +125°C
IL = 1.0 mA
−40°C ≤ TA ≤ +125°C
f = 1 MHz, AV = 1
VS = 2.7 V to 5.5 V
VO = 0 V
−40°C ≤ TA ≤ +125°C
RL = 2 kΩ
To 0.01%
en f = 1 kHz
f = 10 kHz
in
1 For VCM between 1.3 V and 1.8 V, VOS may exceed specified value.
A Grade
Min Typ Max
D Grade
Min Typ Max
Unit
80 500
1100 6000 μV
700 7000 μV
1100
7000 μV
350 750
1300 6000 μV
1800
7000 μV
2100
7000 μV
80 600
1100 6000 μV
800 7000 μV
1600
7000 μV
350 800
1300 6000 μV
2200
7000 μV
2400
7000 μV
0.2 60
0.2 200 pA
25 100
25 200 pA
150 1000
150 1000 pA
0.1 30
0.1 100 pA
50 100 pA
500 500 pA
0 30
3V
68 83
52 65
dB
30 100
20 60
V/mV
2 2 μV/°C
2.92 2.95
2.88
20 35
50
±30
12
2.92 2.95
2.88
20 35
50
±30
12
V
V
mV
mV
mA
Ω
67 80
56 72
dB
680 1000
680 1000 μA
1300
1300 μA
5.2 5.2 V/μs
<0.5 <0.5 μs
8.2 8.2 MHz
50 50 Degrees
33 33 nV/√Hz
18 18 nV/√Hz
0.05 0.05 pA/√Hz
Rev. G | Page 3 of 24

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AD8601/AD8602/AD8604
VS = 5.0 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage (AD8601/AD8602)
Offset Voltage (AD8604)
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Full Power Bandwidth
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
Symbol Conditions
VOS 0 V ≤ VCM ≤ 5 V
−40°C ≤ TA ≤ +125°C
VOS VCM = 0 V to 5 V
−40°C ≤ TA ≤ +125°C
IB
−40°C ≤ TA ≤ +85°C
−40°C ≤ TA ≤ +125°C
IOS
−40°C ≤ TA ≤ +85°C
−40°C ≤ TA ≤ +125°C
CMRR
AVO
ΔVOS/ΔT
VCM = 0 V to 5 V
VO = 0.5 V to 4.5 V,
RL = 2 kΩ, VCM = 0 V
VOH IL = 1.0 mA
IL = 10 mA
−40°C ≤ TA ≤ +125°C
VOL IL = 1.0 mA
IL = 10 mA
−40°C ≤ TA ≤ +125°C
IOUT
ZOUT f = 1 MHz, AV = 1
PSRR
ISY
VS = 2.7 V to 5.5 V
VO = 0 V
−40°C ≤ TA ≤ +125°C
SR
tS
BWp
GBP
Φo
RL = 2 kΩ
To 0.01%
<1% distortion
en f = 1 kHz
f = 10 kHz
in f = 1 kHz
A Grade
Min Typ Max
80 500
1300
80 600
1700
0.2 60
100
1000
0.1 30
6 50
25 500
05
74 89
30 80
2
4.925
4.7
4.6
4.975
4.77
15
125
±50
10
30
175
250
67 80
750 1200
1500
6
<1.0
360
8.4
55
33
18
0.05
D Grade
Min Typ Max
1300 6000
7000
1300 6000
7000
0.2 200
200
1000
0.1 100
6 100
25 500
05
56 67
20 60
2
4.925
4.7
4.6
4.975
4.77
15
125
±50
10
30
175
250
56 72
750 1200
1500
6
<1.0
360
8.4
55
33
18
0.05
Unit
μV
μV
μV
μV
pA
pA
pA
pA
pA
pA
V
dB
V/mV
μV/°C
V
V
V
mV
mV
mV
mA
Ω
dB
μA
μA
V/μs
μs
kHz
MHz
Degrees
nV/√Hz
nV/√Hz
pA/√Hz
Rev. G | Page 4 of 24

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ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Supply Voltage
Input Voltage
Differential Input Voltage
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature Range (Soldering, 60 sec)
ESD
Rating
6V
GND to VS
±6 V
−65°C to +150°C
−40°C to +125°C
−65°C to +150°C
300°C
2 kV HBM
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.
AD8601/AD8602/AD8604
THERMAL RESISTANCE
θJA is specified for worst-case conditions, that is, a device
soldered onto a circuit board for surface-mount packages using
a standard 4-layer board.
Table 4. Thermal Resistance
Package Type
θJA θJC Unit
5-Lead SOT-23 (RJ) 190 92 °C/W
8-Lead SOIC (R)
120 45 °C/W
8-Lead MSOP (RM) 142 45 °C/W
14-Lead SOIC (R)
115 36 °C/W
14-Lead TSSOP (RU)
112
35
°C/W
16-Lead QSOP (RQ)
115
36
°C/W
ESD CAUTION
Rev. G | Page 5 of 24