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ADS8509: sample error

Part Number: ADS8509

when I use AD8809 sample voltage around 0.1V to  -0.1V,it will give me wong data,such as 5V.But when it samples other voltage,it can give me right data.The schematic is as same as datasheet ,input range is ±10V with trim。

  • Hi user3947661,

    Does your circuit have any front-end amplifier? Are you using same component value as the the components in the Figure 30 blockdiagram in the datasheet? If you are evaluating this ADC, I would suggest you to use our new generation HV precision ADC, ADS8681 or ADS8685, both have a lot of features which can eliminate the requirement using many external components for trim also provide a much better performance.

    Regards,

    Dale