Very High Common-Mode Voltage

Precision Difference Amplifier

Enhanced Product

AD8479-EP

Rev. 0

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FEATURES

±600 V dc common-mode voltage range

Rail-to-rail output

Fixed gain of 1

Wide power supply operating voltage range of ±2.5 V to ±18 V

550 μA typical power supply current

Excellent ac specifications

80 dB minimum CMRR

130 kHz small signal −3 dB bandwidth

High accuracy dc performance

10 ppm maximum gain nonlinearity

15 µV/°C maximum offset voltage drift

5 ppm/°C maximum gain drift

ENHANCED PRODUCT FEATURES

Supports defense and aerospace applications (AQEC standard)

Military temperature range (−55°C to +125°C)

Controlled manufacturing baseline

One assembly/test site

One fabrication site

Product change notification

Qualification data available on request

APPLICATIONS

Avionics

Unmanned systems

High voltage current sensing

Motor controls

Isolation

FUNCTIONAL BLOCK DIAGRAM

2

3

4

1

7

6

8

REF(–)

–IN

1MΩ

AD8479-EP

1MΩ

+IN

NC

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.

OUTPUT

5

REF(+)

Figure 1.

GENERAL DESCRIPTION

The AD8479-EP is a difference amplifier with a very high input

precision device that allows the user to accurately measure

The AD8479-EP can replace costly isolation amplifiers in

applications that do not require galvanic isolation. The device

protected from common-mode or differential mode transients

up to ±600 V.

The AD8479-EP has low offset voltage, low offset voltage drift,

low gain drift, low common-mode rejection drift, and excellent

common-mode rejection ratio (CMRR) over a wide frequency

range.

The AD8479-EP is available in a space-saving 8-lead SOIC package

and is operational over the −55°C to +125°C temperature range.

Additional application and technical information can be found

in the AD8479 data sheet.

–800

–600

–400

–200

0

200

400

600

800

–20

–15

–10

–5

0

5

10

15

20