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ADS9110EVM-PDK: Why is the ADS9110EVM bandwidth limited to 160kHz, while the ADS8881EVM bandwidth is limited to 1.6MHz?

Michael Grino
Prodigy 140 points

Part Number: ADS9110EVM-PDK
Other Parts Discussed in Thread: ADS9110, ADS8881

The EVM board for the ADS9110 has its input bandwidth limited to 160kHz by the LPF on the input amp, but the ADS8881 EVM board has its bandwidth limited to 1.6MHz. What is the reason for this?

  • 0
    TI__Mastermind 49520 points
    Hi Michael,

    Welcome to the TI E2E Community.

    There is no one specific reason, and in general, you should bandwidth limit your system to improve SNR and THD when possible. In a real world system where there is likely wideband external noise, you would want to limit the BW to less than 500kHz for the ADS8881 to prevent aliasing.

    The ADS8881EVM was tested using a precision audio source, which outputs a very clean signal and does not necessarily require an anti-aliasing filter, but in most cases, you would need one. Similar to the ADS9110EVM design, you could design an anti-alias filter with the input driver amplifier.

    Even though the EVM for the ADS9110 limits the input BW to 160kHz, this device can support up to 1MHz (with a sample rate max of 2Msps), vs the ADS8881 input BW up to 500kHz (with a sample rate max of 1Msps).

    I hope this answer's your question. If not, please feel free to post follow-up questions to this thread.

    Regards,
    Keith N.
    Precision ADC Applications
  • 0 in reply to Keith Nicholas
    Prodigy 140 points

    Thanks for the clarification.