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ADS1259-Q1: Sample-and-Hold circuit model for ADS1259-Q1

RYO
Intellectual 2000 points
Part Number: ADS1259-Q1
Other Parts Discussed in Thread: ADS1259

Hi all,

Do you have any SPICE or TINA model for ADS1259(-Q1)? I would like to check the filtering value. If you have a sample-and-hold circuit model for this device, that'd be fine.

Regards,
RYO

  • 0
    TI__Mastermind 44640 points

    Hi RYO,

    We do not have a SPICE model for the ADS1259, but you can get an approximation of the input structure filtering from figure 37 in the (ADS1259) datasheet:

    For the input series switches I would estimate an on-resistance somewhere in the range of 100 - 200 Ohms.

    Keep in mind that the ADC's digital filter will provide significantly more filtering than this input path. Also, any external RC anti-aliasing filters will also likely have a lower cutoff frequency.