AD823A_12 Datasheet, PDF (1/20 Pages) Analog Devices – Wide Supply Dual, 17 MHz, Rail-to-Rail

Data Sheet
Wide Supply Dual, 17 MHz, Rail-to-Rail
FET Input Amplifier
AD823A
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 470 pF (G = +1, 25% overshoot)
Linear output current of 40 mA, 0.5 V from supplies
Excellent ac performance on 2.6 mA/amplifier
−3 dB bandwidth of 17 MHz, G = +1
325 ns settling time to 0.01% (2 V step)
Slew rate of 30 V/μs
Low distortion: −108 dBc at 20 kHz (G = −1, RL = 2 kΩ)
Good dc performance
700 μV maximum input offset voltage
1 μV/°C offset voltage drift
25 pA maximum input bias current
Low noise: 14 nV/√Hz at 10 kHz
No phase inversion with inputs to the supply rails
APPLICATIONS
Photodiode preamps
Active filters
12-bit to 16-bit data acquisition systems
Medical instrumentation
Precision instrumentation
GENERAL DESCRIPTION
The AD823A is a dual precision, 17 MHz, JFET input op amp
manufactured in the extra fast complementary bipolar (XFCB)
process. The AD823A can operate from a single supply of 3 V
to 36 V or from 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 20 mV of each rail for IOUT ≤ 100 μA, providing
outstanding output dynamic range. It also has a linear output
current of 40 mA, 0.5 V from the supply rails.
An offset voltage of 700 μV maximum, an offset voltage drift of
1 μV/°C, and typical input bias currents of 0.3 pA provide dc
precision with source impedances up to 1 GΩ. The AD823A
provides 17 MHz, −3 dB bandwidth, and a 30 V/μs slew rate with
a low supply current of only 2.6 mA per amplifier. It also provides
low input voltage noise of 14 nV/√Hz and −108 dB SFDR at
20 kHz. The AD823A has low input capacitances (0.6 pF differ-
ential and 1.3 pF common mode) and drives more than 500 pF
of direct capacitive load as a follower. This lets the amplifier
handle a wide range of load conditions.
Rev. B
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CONNECTION DIAGRAM
OUT1 1
–IN1 2
+IN1 3
–V_S 4
AD823A
8 +V_S
7 OUT2
6 –IN2
5 +IN2
Figure 1. 8-Lead SOIC
AD823A
OUT1 1
–IN1 2
+IN1 3
–V_S 4
8 +V_S
7 OUT2
6 –IN2
5 +IN2
TOP VIEW
(Not to Scale)
Figure 2. 8-Lead MSOP
3.0V
V_S = 3V
C_L = 50pF
G = +1
1.5V
0V
500mV/DIV
200µs/DIV
Figure 3. Output Swing, +VS = +3 V, 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 ADC drivers, high speed active filters,
and other low voltage, high dynamic range systems.
The AD823A is available over the industrial temperature range
of −40°C to +85°C and is offered in an 8-lead SOIC package and
an 8-lead MSOP package.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
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