Single-Supply 42 V System

Difference Amplifier

AD8205

Rev. 0

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FEATURES

Ideal for current shunt applications

High common-mode voltage range

−2 V to +65 V operating

−5 V to +68 V survival

Gain = 50

Wide operating temperature range

Die: −40°C to +150°C

8-lead SOIC:

−40°C to +125°C

Adjustable offset

Available in SOIC and die form

EXCELLENT AC AND DC PERFORMANCE

15 µV/°C offset drift

30 ppm/°C gain drift

80 dB CMRR dc to 20 kHz

APPLICATIONS

High-side current sensing in:

Motor controls

Transmission controls

Diesel injection controls

Engine management

Suspension controls

Vehicle dynamic controls

DC-to-dc converters

FUNCTIONAL BLOCK DIAGRAM

AD8205

8

1

4

2

3

7

5

6

+IN

–IN

NC

NC = NO CONNECT

GND

V+

OUT

Figure 1.

GENERAL DESCRIPTION

The AD8205 is a single-supply difference amplifier for amplify-

ing small differential voltages in the presence of large common-

mode voltages. The operating input common-mode voltage

range extends from −2 V to +65 V. The typical single-supply

voltage is 5 V.

The AD8205 is offered in die and packaged form. The operating

temperature range for the die is 25°C higher (up to 150°C) than

the packaged part to enable the user to apply the AD8205 in

high temperature applications.

Excellent dc performance over temperature keeps errors in the

measurement loop to a minimum. Offset drift is typically less

than 15 µV/°C, and gain drift is typically below 30 ppm/°C.

The output offset can be adjusted from 0.05 V to 4.8 V with a

output is set at half scale. Attaching both pins to GND causes

the output to be unipolar, starting near ground. Attaching both

pins to V+ causes the output to be unipolar starting near V+.

Other offsets can be obtained by applying an external voltage to