Ultralow Offset Voltage

Dual Op Amp

Data Sheet

AD708

Rev. D

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FEATURES

Very high dc precision

30 μV maximum offset voltage

0.3 μV/°C maximum offset voltage drift

0.35 μV p-p maximum voltage noise (0.1 Hz to 10 Hz)

5 million V/V minimum open-loop gain

130 dB minimum CMRR

120 dB minimum PSRR

Matching characteristics

30 μV maximum offset voltage match

0.3 μV/°C maximum offset voltage drift match

130 dB minimum CMRR match

Available in 8-lead narrow body, PDIP, and

hermetic CERDIP and CERDIP/883B packages

PIN CONFIGURATION

1

OUTPUT A

2

–IN A

3

+IN A

4

–VS

+VS

8

OUTPUT B

7

–IN B

6

+IN B

5

AD708

TOP VIEW

(Not to Scale)

A

–

+

–

+

B

Figure 1. PDIP (N) and CERDIP (Q) Packages

GENERAL DESCRIPTION

The AD708 is a high precision, dual monolithic operational

amplifier. Each amplifier individually offers excellent dc

precision with maximum offset voltage and offset voltage drift

of any dual bipolar op amp.

The matching specifications are among the best available in any

dual op amp. In addition, the AD708 provides 5 V/μV mini-

mum open-loop gain and guaranteed maximum input voltage

noise of 350 nV p-p (0.1 Hz to 10 Hz). All dc specifications

show excellent stability over temperature, with offset voltage

drift typically 0.1 μV/°C and input bias current drift of

25 pA/°C maximum.

The AD708 is available in four performance grades. The

AD708J is rated over the commercial temperature range of

0°C to 70°C and is available in a narrow body, PDIP. The

AD708A and AD708B are rated over the industrial temperature

range of −40°C to +85°C and are available in a CERDIP.

The AD708S is rated over the military temperature range of

−55°C to +125°C and is available in a CERDIP military version

processed to MIL-STD-883B.

PRODUCT HIGHLIGHTS

1. The combination of outstanding matching and individual

specifications make the AD708 ideal for constructing high

gain, precision instrumentation amplifiers.

2. The low offset voltage drift and low noise of the AD708

allow the designer to amplify very small signals without

sacrificing overall system performance.

3. The AD708 10 V/µV typical open-loop gain and 140 dB

common-mode rejection make it ideal for precision

applications.