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AMC1305M25: AMC1305M25 digital domain difference for output data between fail-safe and clipping

Zhou Fang67
Expert 4250 points

Part Number: AMC1305M25

Hi Expert,

AMC1305M25 offers a function to identify full-scale clipping and AVDD fail on output data stream. 

In digital domain, assume after Sinc3 filter with 32 OSR, what is the amplitude difference between full-scale clipping and fail-safe?

With OSR32, the bit stream length is 32768, assume -312.5mV, the output stream is "0" with 255 "1". So the absolute difference on digital domain is 0xFF? Is this calculation correct?

Thanks a lot.

Zhou

  • 0
    TI__Guru**** 182551 points

    Hi Zhou,

    The linear FSR of the AMC1305M25 is +/-250mV, the clipping limit is +/-312.5mV. When you reach the clipping limit, the output will be all zeros or all ones. Once you exceed the clipping limit, the output will produce a single zero (or one) every 128 bits on DOUT.

  • 0 in reply to Tom Hendrick
    TI__Expert 4250 points

    Hi Tom,

    When you reach the clipping limit, the output will be all zeros or all ones.

    In datasheet, all zeros or all ones are generated when AVDD failed. It is supposed there would not be all ones or zeros when input approaching clipping limit. This is confusing. 

    Thanks.