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ADS7854: Bandwidth

Juan Aparicio Jimenez
Intellectual 2200 points
Part Number: ADS7854

Team, 

We are looking at using ADS7854IPWR.

BW of the ADC needed must be above 100kHz. 

What is the BW of this ADC?

Thanks,

Juan.

  • +1
    TI__Mastermind 24468 points

    Juan,

    The internal bandwidth of a SAR ADC is set by the internal sample and hold circuit.   This circuit is documented in section "8.3.2 Analog Inputs".  For this device the values are Rs = 50 ohm, and Csample = 40pF.  This translates to a bandwidth of 79.5MHz.  For SAR converters you can normally assume that the bandwidth is significantly greater than the maximum sampling rate.  For this device the maximum sampling rate is 1Msps, so the 78MHz is what you would expect.  I hope this is helpful to you.

    Best regards,

    Art

  • 0 in reply to Art Kay
    TI__Intellectual 2200 points

    Hi Art,

    Thanks for the explanation.

    Best,

    Juan.