a
FEATURES
True Single-Supply Operation
Output Swings Rail-to-Rail
Input Voltage Range Extends Below Ground
Single-Supply Capability from 3 V to 36 V
Dual-Supply Capability from 1.5 V to 18 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 A Max Quiescent Current per Amplifier
Unity Gain Bandwidth: 1.8 MHz
Slew Rate of 3.0 V/ms
Good DC Performance
800 V Max Input Offset Voltage
2 V/ C Typ Offset Voltage Drift
25 pA Max Input Bias Current
Low Noise
13 nV/÷Hz @ 10 kHz
No Phase Inversion
APPLICATIONS
Battery-Powered Precision Instrumentation
Photodiode Preamps
Active Filters
12- to 14-Bit Data Acquisition Systems
Medical Instrumentation
Low Power References and Regulators
PRODUCT DESCRIPTION
Single-Supply, Rail-to-Rail
Low Power FET-Input Op Amp
AD822
CONNECTION DIAGRAM
8-Lead Plastic DIP, MSOP, and SOIC
OUT1 1
–IN1 2
+IN1 3
V–
4
8 V+
7 OUT2
6 –IN2
AD822
5 +IN2
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.
Offset voltage of 800
mV
max, offset voltage drift of 2
mV/∞C,
input bias currents below 25 pA, and low input voltage noise
provide dc precision with source impedances up to a Gigaohm.
1.8 MHz unity gain bandwidth, –93 dB THD at 10 kHz,
and 3 V/ms slew rate are provided with a low supply current of
800
mA
per amplifier. 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 perfor-
mance, 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 and
B grades are rated over the industrial temperature range of
–40∞C to +85∞C.
The AD822 is offered in three varieties of 8-lead packages:
Plastic DIP, MSOP, and SOIC.
The AD822 is a dual precision, low power FET input op amp
that can operate from a single supply of 3.0 V to 36 V or dual
supplies of
±
1.5 V to
±
18 V. It has true single-supply capability
100
1V
INPUT VOLTAGE NOISE – nV/ H
Z
100
1V
20µs
.... .... .... .... .... .... .... .... .... ....
5V
90
.
10
V
OUT
10
0%
.... .... .... .... .... .... .... .... .... ....
1V
0V
(GND)
1
10
100
1k
FREQUENCY – Hz
10k
Figure 1. Input Voltage Noise vs. Frequency
Figure 2. Gain-of-2 Amplifier; V
S
= 5, 0, V
IN
= 2.5 V
Sine Centered at 1.25 V, R
L
= 100 k
W
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
© Analog Devices, Inc., 2002
ETC [ ETC ]
