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ADS4122 how to improve the glitch

Kuramochi Tadahiko
Guru 28715 points


Hi,

My customer is troubled that amplitude of the glitch is large after the aperture delay.

Please refer following the waveform.

They tried to add the filter(50Ω and 3.3pF), however there is no improving.

Could you please introduce how to improve the glitch?

Thanks and Regards,

Kuramochi

  • 0
    TI__Guru* 91947 points

    Tadahiko,

    The internal RCR filter is designed to reduces glitches at high IF (550MHz). It appears the customer is using a low IF (~50MHz). According to the data sheet, in this case the user should use external filtering, such as those shown in figures 108 and 109 to reduce the glitches at low IF. Has the customer tried this? Can you send us their schematic?

    Regards,

    Jim

  • 0 in reply to jim s
    Guru 28715 points
    Hi Seton-san,

    Thank for your response.

    >Has the customer tried this?
    Yes, they have.

    > Can you send us their schematic?
    OK. Could you let me know your e-mail address?

    Thanks,
    Kuramochi
  • 0 in reply to Kuramochi Tadahiko
    TI__Guru* 91947 points

    Kuramochi,

    My email address is j-seton@ti.com

    Regards,

    Jim