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PGA460-Q1: About how to use Test pin

tr
Prodigy 220 points
Part Number: PGA460-Q1
Other Parts Discussed in Thread: PGA460

Hi,

Could you show me details of Test pin?

I can't understand about the use of Test pin functions(red square).

 Under what situation we need these Test pin functions?

Thank you.

  • 0
    TI__Expert 7495 points

    Hi tr,

    The test pin options that you have in the red boxes are not needed for normal operation of the PGA460. These are mainly for if you want to bypass certain parts of the chip or if you want to get more details on some of the internal signals of the device.

    As an example, the ASC_Output function can be used if you want to use your own ADC to capture the amplified analog output so that you can perform your own filtering, digitizing, and threshold algorithms.  This option is not needed if you want to use the PGA460's algorithms.  

    Regards,

    Mekre

  • 0 in reply to Mekre Mesganaw
    Prodigy 220 points

    Hi Mekre,

    Thank you for replying.

    I know it's not necessary to understand these functions for normal operation.

    However, I would like to know about the details for using PGA460.

    Could you tell me the way of using 8MHz clock and ADC Sample Clock.

    (I found that ASC Output is an amplified analog signal before ADC from your response.)

    Regards,

  • 0 in reply to tr
    TI__Expert 7495 points

    Hi Tr,

    The 8 MHz clock may be used to determine the precision of the core clock.  The core clock is generated by an internal digital oscillator that has +/-4% accuracy specified at room temperature. By measuring the frequency of this clock, you could potentially adjust any timing measurements that are made by keeping in mind the actual clock frequency instead of the nominal frequency mentioned in the datasheet.

    The ADC sample clock lets you know the timing between the ADC samples.

    Regards,

    Mekre

  • 0 in reply to Mekre Mesganaw
    Prodigy 220 points

    Hi Mekre,

    This resolved my issue.

    Thank you for your help!

    Regards,