Low Power FET-Input Op Amp
AD822
Rev. J Document Feedback
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AD822
OUT1
–IN1
+IN1
V–
V+
OUT2
–IN2
+IN2
00874-001
FREQUENCY (Hz)
1
10 10k
1k
100
INPUT VOLTAGE NOISE (nV/√Hz)
100
10
00874-002
Data Sheet
FEATURES
True single-supply operation
Output swings rail-to-rail
Input voltage range extends below ground
Single-supply capability from 5 V to 30 V
Dual-supply capability from ±2.5 V to ±15 V
High load drive
Capacitive load drive of 350 pF, G = +1
Minimum output current of 15 mA
Excellent ac performance for low power
800 µA maximum quiescent current per amplifier
Unity-gain bandwidth: 1.8 MHz
Slew rate of 3 V/μs
Good dc performance
800 µV maximum input offset voltage
2 µV/°C typical offset voltage drift
25 pA maximum input bias current
Low noise
13 nV/√Hz at 10 kHz
No phase inversion
Single-Supply, Rail-to-Rail
CONNECTION DIAGRAM
Figure 1. 8-Lead PDIP (N Suffix);
8-Lead MSOP (RM Suffix);
and 8-Lead SOIC_N (R Suffix)
APPLICATIONS
Battery-powered precision instrumentation
Photodiode preamps
Active filters
12-bit to 14-bit data acquisition systems
Medical instrumentation
Low power references and regulators
GENERAL DESCRIPTION
The AD822 is a dual precision, low power FET input op amp
that can operate from a single supply of 5 V to 30 V or from
dual supplies of ±2.5 V to ±15 V. It has true single-supply capability
with an input voltage range extending below the negative rail,
allowing the AD822 to accommodate input signals below ground
while in the single-supply mode. Output voltage swing extends
to within 10 mV of each rail, providing the maximum output
dynamic range.
Offset voltage of 800 µV maximum, offset voltage drift of 2 µV/°C,
input bias currents below 25 pA, and low input voltage noise
provide dc precision with source impedances up to a gigaohm.
The 1.8 MHz unity-gain bandwidth, –93 dB total harmonic
distortion (THD) at 10 kHz, and 3 V/µs slew rate are provided
with a low supply current of 800 µA per amplifier.
Figure 2. Input Voltage Noise vs. Frequ ency
responsi bility is as sumed 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 Device s.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1993–2015 Analog Devices, Inc. All rights reserved.
AD822 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Connection Diagram ....................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 4
Absolute Maximum Ratings .......................................................... 10
Thermal Resistance .................................................................... 10
Maximum Power Dissipation ................................................... 10
ESD Caution ................................................................................ 10
REVISION HISTORY
9/15—Rev. I to Rev. J
Changes to Figure 12 ...................................................................... 12
1/10—Rev. H to Rev. I
Changes to Features Section and General Description Section . 1
Changes to Endnote 1, Table 1 ........................................................ 5
Changes to Endnote 1, Table 2 ........................................................ 7
Changes to Endnote 1, Table 3 ........................................................ 9
Deleted Table 4; Renumbered Sequentially................................. 10
Changes to Table 5 .......................................................................... 12
Updated Outline Dimensions ....................................................... 21
Changes to Ordering Guide .......................................................... 22
Deleted 3 V, Single-Supply Stereo Headphone Driver Section . 22
Deleted Figure 50; Renumbered Sequentially............................. 22
8/08—Rev. G to Rev H.
Changes to Features Section and General Description Section . 1
Changed V
Changes to Table 1 ............................................................................ 4
Changes to Table 2 ............................................................................ 6
Changes to Table 3 ............................................................................ 8
Changes to Table 5 .......................................................................... 12
Added Table 6; Renumbered Sequentially .................................. 12
Changes to Figure 13 Caption ....................................................... 14
Changes to Figure 29, Figure 31, and Figure 35 ......................... 17
Changes to Figure 36 ...................................................................... 18
Changed Application Notes Section to Applications
Information Section ....................................................................... 20
Changes to Figure 46 and Figure 47 ............................................. 21
Changes to Figure 49 ...................................................................... 22
Changes to Figure 51 ...................................................................... 23
6/06—Rev. F to Rev. G
Changes to Features .......................................................................... 1
Changes to Table 4 .......................................................................... 10
Changes to Table 5 .......................................................................... 12
Changes to Table 6 .......................................................................... 22
to V
O
Throughout ................................................... 4
OUT
Typical Performance Characteristics ........................................... 11
Applications Information .............................................................. 18
Input Characteristics .................................................................. 18
Output Characteristics............................................................... 18
Single-Supply Voltage to Frequency Converter ..................... 19
Single-Supply Programmable Gain Instrumentation
Amplifier ..................................................................................... 20
Low Dropout Bipolar Bridge Driver ........................................ 20
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 22
10/05—Rev. E to Rev. F
Updated Format .................................................................. Universal
Changes to Outline Dimensions .................................................. 24
Updated Ordering Guide .............................................................. 24
1/03—Rev. D to Rev. E
Edits to Specifications ....................................................................... 2
Edits to Figure 10 ............................................................................ 16
Updated Outline Dimensions ....................................................... 17
10/02—Rev. C to Rev. D
Edits to Features................................................................................. 1
Edits to Ordering Guide ................................................................... 6
Updated SOIC Package Outline ................................................... 17
8/02—Rev. B to Rev. C
All Figures Updated ........................................................... Universal
Edits to Features................................................................................. 1
Updated All Package Outlines ...................................................... 17
7/01—Rev. A to Rev. B
All Figures Updated ........................................................... Universal
CERDIP References Removed ....................................... 1, 6, and 18
Additions to Product Description ................................................... 1
8-Lead SOIC and 8-Lead MSOP Diagrams Added ...................... 1
Deletion of AD822S Column ........................................................... 2
Edits to Absolute Maximum Ratings and Ordering Guide ......... 6
Removed Metallization Photograph ............................................... 6
7/93—Revision 0: Initial Version
Rev. J | Page 2 of 24
Data Sheet AD822
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100
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V
OUT
5V
0V
(GND)
1V
20µs
1V
1V
00874-003
The AD822 drives up to 350 pF of direct capacitive load as a
follower and provides a minimum output current of 15 mA.
This allows the amplifier to handle a wide range of load conditions.
Its combination of ac and dc performance, plus the outstanding
load drive capability, results in an exceptionally versatile amplifier
for the single-supply user.
The AD822 is available in two performance grades. The A grade
and B grade are rated over the industrial temperature range of
−40°C to +85°C.
The AD822 is offered in three varieties of 8-lead packages:
PDIP, MSOP, and SOIC_N.
Figure 3. Gain of 2 Amplifier; V
V
= 2.5 V Sine Centered at 1.25 V, RL = 100 Ω
IN
= 5 V, 0 V,
S
Rev. J | Page 3 of 24
AD822 Data Sheet
DYNAMIC PERFORMANCE
SPECIFICATIONS
VS = 0 V, 5 V at TA = 25°C, VCM = 0 V, V
Table 1.
Parameter Test Conditions/Comments
DC PERFORMANCE
Initial Offset 0.1 0.8 0.1 0.4 mV
Maximum Offset Over Temperature 0.5 1.2 0.5 0.9 mV
Offset Drift 2 2 µV/°C
Input Bias Current VCM = 0 V to 4 V 2 25 2 10 pA
At T
0.5 5 0.5 2.5 nA
MAX
Input Offset Current 2 20 2 10 pA
At T
0.5 0.5 nA
MAX
Open-Loop Gain V
RL = 100 kΩ 500 1000 500 1000 V/mV
T
to T
MIN
400 400 V/mV
MAX
RL = 10 kΩ 80 150 80 150 V/mV
T
to T
MIN
80 80 V/mV
MAX
RL = 1 kΩ 15 30 15 30 V/mV
T
to T
MIN
10 10 V/mV
MAX
NOISE/HARMONIC PERFORMANCE
Input Voltage Noise
f = 0.1 Hz to 10 Hz 2 2 µV p-p
f = 10 Hz 25 25 nV/√Hz
f = 100 Hz 21 21 nV/√Hz
f = 1 kHz 16 16 nV/√Hz
f = 10 kHz 13 13 nV/√Hz
Input Current Noise
f = 0.1 Hz to 10 Hz 18 18 fA p-p
f = 1 kHz 0.8 0.8 fA/√Hz
Harmonic Distortion RL = 10 kΩ to 2.5 V
f = 10 kHz V
= 0.2 V, unless otherwise noted.
OUT
= 0.2 V to 4 V
OUT
= 0.25 V to 4.75 V −93 −93 dB
OUT
A Grade B Grade
Unit Min Typ Max Min Typ Max
Unity-Gain Frequency 1.8 1.8 MHz
Full Power Response V
Slew Rate 3 3 V/µs
Settling Time
To 0.1% V
To 0.01% V
MATCHING CHARACTERISTICS
Initial Offset 1.0 0.5 mV
Maximum Offset Over Temperature 1.6 1.3 mV
Offset Drift 3 3 µV/°C
Input Bias Current 20 10 pA
Crosstalk @ f = 1 kHz RL = 5 kΩ −130 –130 dB
Crosstalk @ f = 100 kHz RL = 5 kΩ −93 –93 dB
p-p = 4.5 V 210 210 kHz
OUT
= 0.2 V to 4.5 V 1.4 1.4 µs
OUT
= 0.2 V to 4.5 V 1.8 1.8 µs
OUT
Rev. J | Page 4 of 24
Data Sheet AD822
VCC − VOH
I
= 20 µA
10
14 10
14
mV
Quiescent Current, T
to T
1.24
1.6 1.24
1.6
mA
A Grade B Grade
Parameter Test Conditions/Comments
INPUT CHARACTERISTICS
Input Voltage Range1, T
MIN
to T
−0.2 +4 −0.2 +4 V
MAX
Common-Mode Rejection Ratio (CMRR) VCM = 0 V to 2 V 66 80 69 80 dB
T
to T
MIN
VCM = 0 V to 2 V 66 66 dB
MAX
Input Impedance
Differential 1013||0.5 1013||0.5 Ω||pF
Common Mode 1013||2.8 1013||2.8 Ω||pF
OUTPUT CHARACTERISTICS
Output Saturation Voltage2
VOL − VEE I
T
to T
MIN
T
MIN
10 10 mV
MAX
to T
20 20 mV
MAX
VOL − VEE I
T
to T
MIN
80 80 mV
MAX
VCC − VOH I
T
to T
MIN
160 160 mV
MAX
VOL – VEE I
T
to T
MIN
1000 1000 mV
MAX
VCC − VOH I
T
to T
MIN
1900 1900 mV
MAX
= 20 µA 5 7 5 7 mV
SINK
SOURCE
= 2 mA 40 55 40 55 mV
SINK
= 2 mA 80 110 80 110 mV
SOURCE
= 15 mA 300 500 300 500 mV
SINK
= 15 mA 800 1500 800 1500 mV
SOURCE
Operating Output Current 15 15 mA
T
to T
MIN
12 12 mA
MAX
Capacitive Load Drive 350 350 pF
POWER SUPPLY
MIN
MAX
Power Supply Rejection V+ = 5 V to 15 V 66 80 70 80 dB
T
to T
MIN
1
This is a functional specification. Amplifier bandwidth decreases when the input common-mode voltage is driven in the range (V+ − 1 V) to V+. Common-mode error
voltage is typically less than 5 mV with the common-mode voltage set at 1 V below the positive supply.
2
VOL − VEE is defined as the difference between the lowest possible output voltage (VOL) and the negative voltage supply rail (VEE). VCC − VOH is defined as the difference
between the highest possible output voltage (V
66 70 dB
MAX
) and the positive supply voltage (VCC).
OH
Unit Min Typ Max Min Typ Max
Rev. J | Page 5 of 24
AD822 Data Sheet
Crosstalk @ f = 100 kHz
RL = 5 kΩ
−93
−93 dB
Common-Mode Rejection Ratio (CMRR)
VCM = −5 V to +2 V
66
80 69
80 dB
VS = ±5 V at TA = 25°C, VCM = 0 V, V
Table 2.
Parameter Test Conditions/Comments
DC PERFORMANCE
Initial Offset 0.1 0.8 0.1 0.4 mV
Maximum Offset Over Temperature 0.5 1.5 0.5 1 mV
Offset Drift 2 2 µV/°C
Input Bias Current VCM = −5 V to +4 V 2 25 2 10 pA
At T
0.5 5 0.5 2.5 nA
MAX
Input Offset Current 2 20 2 10 pA
At T
0.5 0.5 nA
MAX
Open-Loop Gain V
RL = 100 kΩ 400 1000 400 1000 V/mV
T
to T
MIN
400 400 V/mV
MAX
RL = 10 kΩ 80 150 80 150 V/mV
T
to T
MIN
80 80 V/mV
MAX
RL = 1 kΩ 20 30 20 30 V/mV
T
to T
MIN
10 10 V/mV
MAX
NOISE/HARMONIC PERFORMANCE
Input Voltage Noise
f = 0.1 Hz to 10 Hz 2 2 µV p-p
f = 10 Hz 25 25 nV/√Hz
f = 100 Hz 21 21 nV/√Hz
f = 1 kHz 16 16 nV/√Hz
f = 10 kHz 13 13 nV/√Hz
Input Current Noise
f = 0.1 Hz to 10 Hz 18 18 fA p-p
f = 1 kHz 0.8 0.8 fA/√Hz
Harmonic Distortion RL = 10 kΩ
f = 10 kHz V
DYNAMIC PERFORMANCE
Unity-Gain Frequency 1.9 1.9 MHz
Full Power Response V
Slew Rate 3 3 V/µs
Settling Time
to 0.1% V
to 0.01% V
MATCHING CHARACTERISTICS
Initial Offset 1.0 0.5 mV
Maximum Offset Over Temperature 3 2 mV
Offset Drift 3 3 µV/°C
Input Bias Current 25 10 pA
Crosstalk @ f = 1 kHz RL = 5 kΩ −130 −130 dB
= 0 V, unless otherwise noted.
OUT
= −4 V to +4 V
OUT
= ±4.5 V −93 −93 dB
OUT
p-p = 9 V 105 105 kHz
OUT
= 0 V to ±4.5 V 1.4 1.4 µs
OUT
= 0 V to ±4.5 V 1.8 1.8 µs
OUT
A Grade B Grade
Unit Min Typ Max Min Typ Max
INPUT CHARACTERISTICS
Input Voltage Range1, T
T
to T
MIN
VCM = −5 V to +2 V 66 66 dB
MAX
MIN
Input Impedance
Differential 1013||0.5 1013||0.5 Ω||pF
Common Mode 1013||2.8 1013||2.8 Ω||pF
to T
−5.2 +4 −5.2 +4 V
MAX
Rev. J | Page 6 of 24
Data Sheet AD822
T
to T
1000
1000
mV
A Grade B Grade
Parameter Test Conditions/Comments
OUTPUT CHARACTERISTICS
Output Saturation Voltage2
VOL − VEE I
T
to T
MIN
10 10 mV
MAX
VCC − VOH I
T
to T
MIN
20 20 mV
MAX
VOL − VEE I
T
to T
MIN
80 80 mV
MAX
VCC − VOH I
T
to T
MIN
VOL − V
MIN
160 160 mV
MAX
I
EE
MAX
VCC − VOH I
T
to T
MIN
1900 1900 mV
MAX
= 20 µA 5 7 5 7 mV
SINK
= 20 µA 10 14 10 14 mV
SOURCE
= 2 mA 40 55 40 55 mV
SINK
= 2 mA 80 110 80 110 mV
SOURCE
= 15 mA 300 500 300 500 mV
SINK
= 15 mA 800 1500 800 1500 mV
SOURCE
Operating Output Current 15 15 mA
T
to T
MIN
12 12 mA
MAX
Capacitive Load Drive 350 350 pF
POWER SUPPLY
Quiescent Current, T
MIN
to T
1.3 1.6 1.3 1.6 mA
MAX
Power Supply Rejection VSY = ±5 V to ±15 V 66 80 70 80 dB
T
to T
MIN
1
This is a functional specification. Amplifier bandwidth decreases when the input common-mode voltage is driven in the range (V+ − 1 V) to V+. Common-mode error
voltage is typically less than 5 mV with the common-mode voltage set at 1 V below the positive supply.
2
VOL − VEE is defined as the difference between the lowest possible output voltage (VOL) and the negative voltage supply rail (VEE). VCC − VOH is defined as the difference
between the highest possible output voltage (V
66 70 dB
MAX
) and the positive supply voltage (VCC).
OH
Unit Min Typ Max Min Typ Max
Rev. J | Page 7 of 24
AD822 Data Sheet
T
to T
20
20
V/mV
Crosstalk @ f = 1 kHz
RL = 5 kΩ
−130
−130
dB
Input Voltage Range1, T
to T
−15.2
+14
−15.2
+14
V
VS = ±15 V at TA = 25°C, VCM = 0 V, V
Table 3.
Parameter Test Conditions/Comments
DC PERFORMANCE
Initial Offset 0.4 2 0.3 1.5 mV
Maximum Offset Over Temperature 0.5 3 0.5 2.5 mV
Offset Drift 2 2 µV/°C
Input Bias Current VCM = 0 V 2 25 2 12 pA
VCM = −10 V 40 40 pA
At T
VCM = 0 V 0.5 5 0.5 2.5 nA
MAX
Input Offset Current 2 20 2 12 pA
At T
0.5 0.5 nA
MAX
Open-Loop Gain V
RL = 100 kΩ 500 2000 500 2000 V/mV
T
to T
MIN
500 500 V/mV
MAX
RL = 10 kΩ 100 500 100 500 V/mV
T
to T
MIN
100 100 V/mV
MAX
RL = 1 kΩ 30 45 30 45 V/mV
MIN
MAX
NOISE/HARMONIC PERFORMANCE
Input Voltage Noise
f = 0.1 Hz to 10 Hz 2 2 µV p-p
f = 10 Hz 25 25 nV/√Hz
f = 100 Hz 21 21 nV/√Hz
f = 1 kHz 16 16 nV/√Hz
f = 10 kHz 13 13 nV/√Hz
Input Current Noise
f = 0.1 Hz to 10 Hz 18 18 fA p-p
f = 1 kHz 0.8 0.8 fA/√Hz
Harmonic Distortion RL = 10 kΩ
f = 10 kHz V
DYNAMIC PERFORMANCE
Unity-Gain Frequency 1.9 1.9 MHz
Full Power Response V
Slew Rate 3 3 V/µs
Settling Time
to 0.1% V
to 0.01% V
MATCHING CHARACTERISTICS
Initial Offset 3 2 mV
Maximum Offset Over Temperature 4 2.5 mV
Offset Drift 3 3 µV/°C
Input Bias Current 25 12 pA
= 0 V, unless otherwise noted.
OUT
= −10 V to +10 V
OUT
= ±10 V −85 −85 dB
OUT
p-p = 20 V 45 45 kHz
OUT
= 0 V to ±10 V 4.1 4.1 µs
OUT
= 0 V to ±10 V 4.5 4.5 µs
OUT
A Grade B Grade
Unit Min Typ Max Min Typ Max
Crosstalk @ f = 100 kHz RL = 5 kΩ −93 −93 dB
INPUT CHARACTERISTICS
Common-Mode Rejection Ratio (CMRR) VCM = −15 V to +12 V 70 80 74 90 dB
T
to T
MIN
Input Impedance
Differential 1013||0.5 1013||0.5 Ω||pF
Common Mode 1013||2.8 1013||2.8 Ω||pF
MIN
MAX
VCM = −15 V to +12 V 70 74 dB
MAX
Rev. J | Page 8 of 24
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