AD7671 Output has step

Hi,

 When I use AD7671 to convert signal (1Hz to 1kHz), I found steps in the output.

Attachment figure 1 is the waveform, where green line is input of AD7671;yellow line is the output of AD7671 (a DCA output, the DAC operated well).

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  • Hi Henry Zhang,

      Just some clarification, where is the voltage reference coming from? The reference needs to be very stable. Unstable reference would result in huge error on conversion result. I can see that, you used a opamp to drive the reference, but where did the reference voltage come from? I would recommend using the ADR421 and AD780 as mentioned in the datasheet and it is known to work with AD7671.

    Regards,

    Jonathan

Reply
  • Hi Henry Zhang,

      Just some clarification, where is the voltage reference coming from? The reference needs to be very stable. Unstable reference would result in huge error on conversion result. I can see that, you used a opamp to drive the reference, but where did the reference voltage come from? I would recommend using the ADR421 and AD780 as mentioned in the datasheet and it is known to work with AD7671.

    Regards,

    Jonathan

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