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ADS8556 parameter values calculation

Brian Wang
Expert 8535 points

Other Parts Discussed in Thread: ADS8556

Hi,

 

On page 35 of the datasheet (http://www.ti.com/lit/ds/symlink/ads8556.pdf) there are suggested values for Rf and Cf for the highest data rate. If the ADC is to be run at 150kSPS maximum, what would the suggested values be for those parameters? Thanks in advance.

 

Regards,

 

Brian Wang

  • 0
    TI__Guru**** 182551 points

    Hi Brian,

    Which range do you plan on using with the ADS8556?  Running the device at 150Ksps would give you over 5us sampling time, so in the 4x mode, you could go as high as 1200 ohms and 390pF.  In 2x mode, something like 560ohms and 820pF would be a good starting point.