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Original question:

ADS8866: Simultaneous Sampling using multiple ADCs in daisy chain

ADS8866: Data and clock pin output ringing

Gabriel Wang1
Genius 3825 points
Part Number: ADS8866
Other Parts Discussed in Thread: ADS8860

Dear Expert

We found that Pin 7 & Pin 8 data and clock output ringing . Could u give some advice about how to eliminate this ringing.

1.Pin 7 data waveform

2. pin8 clock  waveform

3. Schematic

  • 0
    TI__Guru 62085 points

    Hello,

    Adding a series termination resistor will help reduce the rise time and ringing on your waveforms.  The resistors should be roughly 22-33Ω in value and located near the driving source of the signal.  So the resistors should be close to the processor on SCLK, and CONVST, and near the ADS8860 on the DOUT signal.