High Voltage,

Precision Difference Amplifier

Data Sheet

AD8209A

Rev. A

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FEATURES

±8000 V HBM ESD for shunt-based applications

AEC-Q100 qualified

EMI filters included

High common-mode voltage range

−2 V to +50 V operating

−20 V to +70 V survival

Buffered output voltage

Gain = 14 V/V

Low-pass filter (single-pole or two-pole)

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

Excellent ac and dc performance

±1 mV typical voltage offset

−5 ppm/°C typical gain drift

80 dB CMRR minimum dc to 10 kHz

Qualified for automotive applications

APPLICATIONS

High-side current sensing

Motor controls

Solenoid controls

Power management

Low-side current sensing

Diagnostic protection

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The AD8209A is a single-supply difference amplifier ideal for

amplifying and low-pass filtering small differential voltages in the

presence of a large common-mode voltage. The input common-

mode voltage range extends from −2 V to +50 V at a single 5 V

supply. The AD8209A is qualified per AEC-Q100 specifications.

The amplifier offers enhanced input overvoltage and ESD

protection, and includes electromagnetic interference (EMI)

filtering.

Automotive applications demand robust, precision components for

improved system control. The AD8209A provides excellent ac and

dc performance, minimizing errors in the application. Typical

offset and gain drift in the MSOP package are less than 5 µV/°C

and −5 ppm/°C, respectively. The device also delivers a minimum

common-mode rejection ratio (CMRR) of 80 dB from dc to

10 kHz.

The AD8209A features an externally accessible 100 kΩ resistor

at the output of the preamplifier (A1) that can be used for low-

pass filtering and for establishing gains other than 14 V/V.

OUT

+IN

–IN

GND

+

–

AD8209A

G = 2

G = 7

A1

A2

+

–

EMI

FILTER

EMI

FILTER

EMI

FILTER