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ADS7809 Low Sample Rate Usage

Barry Berdanier
Prodigy 10 points
Other Parts Discussed in Thread: ADS7809

I have an ADS7809 in an existing design. We are only sampling at around 100Hz. We are having a problem with crosstalk between adjacent samples with large dynamic ranges. Is it possible that we need to increase the size of the 2.2uF filter capacitors on the Cap and/or Ref pins of the ADS7809 because of the low sample rate?

 

Thanks

  • TI__Guru**** 175111 points

    Hi Barry,

    Welcome to the forum!

    Could you please post the section of your schematic around the analog inputs of the ADC?  Also, what is the speed of your SPI clock?  How much of the 10ms cycle time does the ADS7809 spend in acquisition mode (t7, Figure 1, page 5 of the data sheet)?