• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 48 subscribers
  • Views 439 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS8920B: Under sampling, noise performance data

Taketo Sato
Genius 10565 points

Part Number: ADS8920B

Hello team,

Small signal bandwidth of ADS8920B is specified with 23MHz.

Does ADS8920B support under-sampling? 

Could you share noise performance data up to 1.75MHz if you have? such like datasheet figure 28.

Best regards,

  • 0
    TI__Guru 51970 points

    Hello Sato-san,

    The ADS89xx family does not support under-sampling, which is why we do not include any data above the nyquist frequency.  If you under-sample, the SNR and THD are greatly reduced; performance drops to 10b level or less (SNR<60dB).

    The analog input bandwidth of the ADS8920B is determined by the input sampling capacitance and switch resistance.  This number is important to understand the total noise that can be converted by the ADS8920, but does not imply that the device is capable of under-sampling.

    I suggest you look at TI's high speed portfolio of pipeline ADC's, which do support under-sampling.

    Regards,
    Keith Nicholas
    Precision ADC Applications