Wide Supply Dual, 17 MHz, Rail-to-Rail

FET Input Amplifier

Data Sheet

AD823A

Rev. B

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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.

CONNECTION DIAGRAM

AD823A

OUT1

+IN2

–IN2

OUT2

+VS

–IN1

+IN1

–VS

1

2

3

4

8

7

6

5

Figure 1. 8-Lead SOIC

OUT1

1

–IN1

2

+IN1

3

–VS 4

+VS

8

OUT2

7

–IN2

6

+IN2

5

AD823A

TOP VIEW

(Not to Scale)

Figure 2. 8-Lead MSOP

200µs/DIV

500mV/DIV

0V

3.0V

1.5V

VS = 3V

CL = 50pF

G = +1

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.