AD7739 AIN Protection

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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  • Hi Lyn,

    I forgot to mention in my previous post that although the example given was for differential inputs it is also applicable for single-ended inputs.

    The AD7739 can be operated with single-ended inputs that could accept +/- 2.5V given that it follows the condition given in the previous post.

    Hope this helps.

    Thanks and Best Regards,

    Chris

Reply
  • Hi Lyn,

    I forgot to mention in my previous post that although the example given was for differential inputs it is also applicable for single-ended inputs.

    The AD7739 can be operated with single-ended inputs that could accept +/- 2.5V given that it follows the condition given in the previous post.

    Hope this helps.

    Thanks and Best Regards,

    Chris

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