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Single-Supply, Rail-to-Rail
Low Power FET-Input Op Amp
AD822
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 @ 10 kHz
No phase inversion
CONNECTION DIAGRAM
OUT1 1
–IN1 2
+IN1 3
V– 4
8 V+
7 OUT2
6 –IN2
AD822
5 +IN2
Figure 1. 8-Lead PDIP (N Suffix);
8-Lead MSOP (RM Suffix);
and 8-Lead SOIC_N (R Suffix)
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 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 in the single-supply mode. Output voltage swing
extends to within 10 mV of each rail, providing the maximum
output dynamic range.
100
APPLICATIONS
Battery-powered precision instrumentation
Photodiode preamps
Active filters
12-bit to 14-bit data acquisition systems
Medical instrumentation
Low power references and regulators
INPUT VOLTAGE NOISE (nV/√Hz)
10
00874-001
1
10
100
1k
FREQUENCY (Hz)
10k
Figure 2. Input Voltage Noise vs. Frequency
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 THD at 10 kHz,
and 3 V/μs slew rate are provided with a low supply current of
800 μA per amplifier.
Rev. I
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 ©1993–2010 Analog Devices, Inc. All rights reserved.
00874-002
AD822
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
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
REVISION HISTORY
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
O
to V
OUT
Throughout ................................................... 4
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
10/05—Rev. E to Rev. F
Updated Format .................................................................. Universal
Changes to Outline Dimensions .................................................. 24
Updated Ordering Guide .............................................................. 24
1/03—Data sheet changed from Rev. D to Rev. E
Edits to Specifications .......................................................................2
Edits to Figure 10 ............................................................................ 16
Updated Outline Dimensions ....................................................... 17
10/02—Data sheet changed from Rev. C to Rev. D
Edits to Features.................................................................................1
Edits to Ordering Guide ...................................................................6
Updated SOIC Package Outline ................................................... 17
8/02—Data sheet changed from Rev. B to Rev. C
All Figures Updated ................................................................ Global
Edits to Features.................................................................................1
Updated All Package Outlines ...................................................... 17
7/01—Data sheet changed from Rev. A to Rev. B
All Figures Updated ................................................................ Global
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
Rev. I | Page 2 of 24
AD822
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.
0V
(GND)
1V
100
1V
20µs
.... .... .... .... .... .... .... .... .... ....
5V
90
.
V
OUT
10
0%
.... .... .... .... .... .... .... .... .... ....
1V
00874-003
Figure 3. Gain-of-2 Amplifier; V
S
= 5 V, 0 V,
V
IN
= 2.5 V Sine Centered at 1.25 V, R
L
= 100 Ω
Rev. I | Page 3 of 24
AD822
SPECIFICATIONS
V
S
= 0 V, 5 V @ T
A
= 25°C, V
CM
= 0 V, V
OUT
= 0.2 V, unless otherwise noted.
Table 1.
Parameter
DC PERFORMANCE
Initial Offset
Maximum Offset Over Temperature
Offset Drift
Input Bias Current
At T
MAX
Input Offset Current
At T
MAX
Open-Loop Gain
T
MIN
to T
MAX
R
L
= 10 kΩ
T
MIN
to T
MAX
R
L
= 1 kΩ
T
MIN
to T
MAX
NOISE/HARMONIC PERFORMANCE
Input Voltage Noise
f = 0.1 Hz to 10 Hz
f = 10 Hz
f = 100 Hz
f = 1 kHz
f = 10 kHz
Input Current Noise
f = 0.1 Hz to 10 Hz
f = 1 kHz
Harmonic Distortion
f = 10 kHz
DYNAMIC PERFORMANCE
Unity-Gain Frequency
Full Power Response
Slew Rate
Settling Time
To 0.1%
To 0.01%
MATCHING CHARACTERISTICS
Initial Offset
Maximum Offset Over Temperature
Offset Drift
Input Bias Current
Crosstalk @ f = 1 kHz
Crosstalk @ f = 100 kHz
INPUT CHARACTERISTICS
Input Voltage Range
1
, T
MIN
to T
MAX
Common-Mode Rejection Ratio (CMRR)
T
MIN
to T
MAX
Conditions
Min
A Grade
Typ
0.1
0.5
2
2
0.5
2
0.5
500
400
80
80
15
10
1000
150
30
Max
0.8
1.2
25
5
20
Min
B Grade
Typ
0.1
0.5
2
2
0.5
2
0.5
500
400
80
80
15
10
1000
150
30
Max
0.4
0.9
10
2.5
10
Unit
mV
mV
μV/°C
pA
nA
pA
nA
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
V
CM
= 0 V to 4 V
V
OUT
= 0.2 V to 4 V
R
L
= 100 kΩ
2
25
21
16
13
18
0.8
R
L
= 10 kΩ to 2.5 V
V
OUT
= 0.25 V to 4.75 V
−93
1.8
210
3
1.4
1.8
1.0
1.6
3
20
R
L
= 5 kΩ
R
L
= 5 kΩ
−0.2
66
66
−130
−93
+4
80
−0.2
69
66
2
25
21
16
13
18
0.8
−93
1.8
210
3
1.4
1.8
0.5
1.3
3
10
–130
–93
+4
80
μV p-p
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
fA p-p
fA/√Hz
dB
MHz
kHz
V/μs
μs
μs
mV
mV
μV/°C
pA
dB
dB
V
dB
dB
V
OUT
p-p = 4.5 V
V
OUT
= 0.2 V to 4.5 V
V
OUT
= 0.2 V to 4.5 V
V
CM
= 0 V to 2 V
V
CM
= 0 V to 2 V
Rev. I | Page 4 of 24
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