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ADS1298: ADS1298

Amar N
Prodigy 30 points
Part Number: ADS1298

what is the SNR of an ADC whose reference Voltage is 4.096V but the maximum applied actual signal does never exceed +/-20mV. The PGA gain setting is at 4 and the ADC Input referred Noise is 22uV. Should I use 4.096  or 14.14mV or 56.56mV as the signal amplitude for the SNR calculation ?

  • 0
    TI__Genius 11550 points

    Hi Amar,

    Welcome to the E2E forum !!!

    Please find the SNR calculation formula listed below. The SNR is approximately 56dB with the maximum rms input of 14.14mVrms or (20 mV/√2) and ADC input-referred noise of 22uVrms. The SNR will degrade as your maximum input signal is smaller than the reference voltage.

    SNR (dB) = 20log10(Max_RMSSignal/RMS_Noise)

    Thanks

    -TC

  • 0 in reply to TCT
    Prodigy 30 points

    Thanks. This helps. For all dynamic performance calculations, we use the maximum signal voltage that we actually apply to the device rather than the reference voltage.