High Voltage,

Precision Difference Amplifier

Data Sheet

AD8208

Rev. C

Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

©2010–2013 Analog Devices, Inc. All rights reserved.

Technical Support

www.analog.com

FEATURES

Qualified for automotive applications

EMI filters included

High common-mode voltage range

−2 V to +45 V operating

−24 V to +80 V survival

Buffered output voltage

Gain = 20 V/V

Low-pass filter (1-pole or 2-pole)

Wide operating temperature range

−40°C to +125°C for WB grade

−40°C to +150°C for WH grade

Excellent ac and dc performance

±1 mV voltage offset

−5 ppm/°C typical gain drift

80 dB CMRR minimum dc to 10 kHz

APPLICATIONS

High-side current sensing

Motor controls

Solenoid controls

Power management

Low-side current sensing

Diagnostic protection

FUNCTIONAL BLOCK DIAGRAM

OUT

+IN

–IN

GND

+

–

AD8208

G = 2

G = 10

A1

A2

+

–

EMI

FILTER

EMI

FILTER

EMI

FILTER

Figure 1.

GENERAL DESCRIPTION

The AD8208 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 +45 V at a single +5 V

supply. The AD8208 is qualified for automotive applications. The

amplifier offers enhanced input overvoltage and ESD protection,

and includes EMI filtering.

Automotive applications demand robust, precision components for

improved system control. The AD8208 provides excellent ac and

dc performance, minimizing errors in the application. Typical

offset and gain drift in both the SOIC and MSOP packages are

less than 5 µV/°C and 10 ppm/°C, respectively. The device also

delivers a minimum CMRR of 80 dB from dc to 10 kHz.

The AD8208 features an externally accessible 100 kΩ resistor at

the output of the preamplifier (A1), which can be used for low-

pass filtering and for establishing gains other than 20.