Dual, 16 MHz, Rail-to-Rail
FET Input Amplifier
AD823
FEATURES
CONNECTION DIAGRAM
Single-supply operation
Output swings rail-to-rail
Input voltage range extends below ground
Single-supply capability from 3 V to 36 V
High load drive
1
2
3
4
8
7
6
5
+V
S
OUT1
–IN1
OUT2
–IN2
+IN2
+IN1
–V
S
AD823
Figure 1. 8-Lead PDIP and SOIC
Capacitive load drive of 500 pF, G = +1
Output current of 15 mA, 0.5 V from supplies
Excellent ac performance on 2.6 mA/amplifier
−3 dB bandwidth of 16 MHz, G = +1
350 ns settling time to 0.01% (2 V step)
Slew rate of 22 V/μs
R
C
= 100kΩ
= 50pF
L
L
+V = +3V
G = +1
S
3V
Good dc performance
800 μV maximum input offset voltage
2 μV/°C offset voltage drift
25 pA maximum input bias current
Low distortion: −108 dBc worst harmonic @ 20 kHz
Low noise: 16 nV/√Hz @ 10 kHz
GND
No phase inversion with inputs to the supply rails
500mV
200µs
APPLICATIONS
Figure 2. Output Swing, +VS = +3 V, G = +1
Battery-powered precision instrumentation
Photodiode preamps
Active filters
12-bit to 16-bit data acquisition systems
Medical instrumentation
2
1
0
+V = +5V
S
G = +1
–1
–2
–3
–4
–5
–6
GENERAL DESCRIPTION
The AD823 is a dual precision, 16 MHz, JFET input op amp
that can operate from a single supply of 3.0 V to 36 V or from
dual supplies of 1.ꢀ V to 18 V. It has true single-supply
capability with an input voltage range extending below ground
in single-supply mode. Output voltage swing extends to within
ꢀ0 mV of each rail for IOUT ≤ 100 μA, providing outstanding
output dynamic range.
–7
–8
1k
10k
100k
1M
10M
FREQUENCY (Hz)
An offset voltage of 800 μV maximum, an offset voltage drift of
2 μV/°C, input bias currents below 2ꢀ pA, and low input voltage
noise provide dc precision with source impedances up to a
Gigaohm. It provides 16 MHz, −3 dB bandwidth, −108 dB THD
@ 20 kHz, and a 22 V/μs slew rate with a low supply current of
2.6 mA per amplifier. The AD823 drives up to ꢀ00 pF of direct
capacitive load as a follower and provides an output current of
1ꢀ mA, 0.ꢀ V from the supply rails. This allows the amplifier to
handle a wide range of load conditions.
Figure 3. Small Signal Bandwidth, G = +1
This combination of ac and dc performance, plus the outstanding
load drive capability, results in an exceptionally versatile ampli-
fier for applications such as A/D drivers, high speed active
filters, and other low voltage, high dynamic range systems.
The AD823 is available over the industrial temperature range of
−40°C to +8ꢀ°C and is offered in both 8-lead PDIP and 8-lead
SOIC packages.
Rev. B
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 registeredtrademarks arethe 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 ©1995–2007 Analog Devices, Inc. All rights reserved.
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