Zero-Drift, High Voltage,

Bidirectional Difference Amplifier

AD8207

Rev. 0

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FEATURES

Ideal for current shunt applications

EMI filters included

1 μV/°C maximum input offset drift

High common-mode voltage range

−4 V to +65 V operating (5 V supply)

−4 V to +35 V operating (3.3 V supply)

−25 V to +75 V survival

Gain = 20 V/V

3.3 V to 5.5 V supply range

Wide operating temperature range: −40°C to +125°C

Bidirectional current monitoring

<500 nV/°C typical offset drift

<10 ppm/°C typical gain drift

>90 dB CMRR dc to 10 kHz

Qualified for automotive applications

APPLICATIONS

High-side current sensing in

Motor control

Solenoid control

Engine management

Electric power steering

Suspension control

Vehicle dynamic control

DC-to-DC converters

FUNCTIONAL BLOCK DIAGRAM

REF

+IN

–IN

OUT

V+

GND

RANGE

AD8207

ZERO

DRIFT

Figure 1.

GENERAL DESCRIPTION

The AD8207 is a single-supply difference amplifier ideal for

amplifying small differential voltages in the presence of large

common-mode voltage. The operating input common-mode

voltage range extends from −4 V to +65 V with a 5 V supply.

The AD8207 works with a single-supply voltage of 3.3 V to 5 V,

and is ideally suited to withstand large input PWM common-

mode voltages, typical in solenoid and motor control applications.

The AD8207 is available in an 8-lead SOIC package. Excellent

dc performance over temperature keeps errors in the mea-

surement loop to a minimum. Offset drift is typically less

than 500 nV/°C, and gain drift is typically below 10 ppm/°C.

The AD8207 is ideal for bidirectional current sensing

that allow the user to easily offset the output of the device to

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 output

offsets are achieved by applying an external low impedance