a
FEATURES
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
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/ s
Good DC Performance
800 V Max Input Offset Voltage
2 V/ C Offset Voltage Drift
25 pA Max Input Bias Current
Low Distortion
–108 dBc Worst Harmonic @ 20 kHz
Low Noise
16 nV/√Hz @ 10 kHz
No Phase Inversion with Inputs to the Supply Rails
APPLICATIONS
Battery Powered Precision Instrumentation
Photodiode Preamps
Active Filters
12- to 16-Bit Data Acquisition Systems
Medical Instrumentation
Dual, 16 MHz, Rail-to-Rail
FET Input Amplifier
AD823
CONNECTION DIAGRAM
8-Pin Plastic Mini-DIP
and
8-Lead SOIC
OUT1
–IN1
+IN1
–V
S
1
2
3
4
8 +V
S
7 OUT2
6 –IN2
AD823
5 +IN2
The AD823 is available over the industrial temperature range of
–40°C to +85°C and is offered in both 8-pin plastic DIP and
SOIC packages.
3V
R
L
= 100kΩ
C
L
= 50pF
V
S
= +3V
GND
PRODUCT DESCRIPTION
500mV
200µs
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
dual supplies of
±
1.5 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
50 mV of each rail for I
OUT
≤
100
µA
providing outstanding out-
put dynamic range.
Offset voltage of 800
µV
max, 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 Gigohm.
16 MHz, –3 dB bandwidth, –108 dB THD @ 20 kHz and
22 V/µs slew rate are provided with a low supply current of
2.6 mA per amplifier. The AD823 drives up to 500 pF of direct
capacitive load as a follower, and provides an output current of
15 mA, 0.5 V from the supply rails. This allows the amplifier to
handle a wide range of load conditions.
This combination of ac and dc performance, plus the outstand-
ing load drive capability results in an exceptionally versatile am-
plifier for applications such as A/D drivers, high-speed active
filters, and other low voltage, high dynamic range systems.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
OUTPUT – dB
Figure 1. Output Swing, V
S
= +3 V, G = +1
2
1
0
–1
–2
–3
–4
–5
–6
–7
–8
1k
10k
100k
1M
FREQUENCY – Hz
10M
V
S
= +5V
G = +1
Figure 2. Small Signal Bandwidth, G = +1
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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