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AD7739 AIN Protection

Question asked by Lyn on Dec 25, 2012
Latest reply on Jan 16, 2013 by RobK

The AD7739 datasheet states that the device can operate with +/- 2.5 volt inputs.

 

The Absolute Maximum ratings for the AIN pins are listed as -0.3V to AVDD + 0.3V which would appear to contradict the input voltage range.

 

I wish to use the device with an external instrumentation amplifier operating with supplies of ca +/- 15V and a ouput voltage range of +/- 2V in normal operation.

 

How should I protect the input of the AD7739 from overvoltage ouput of the instrumentation amplifier.

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