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Regarding ADS8668 evaluation kit

Dexter
Intellectual 450 points
Other Parts Discussed in Thread: ADS8668

In ADS8668 evaluation kit  schematic, I have few quarries...

1) Why 357 ohm resistor and 10 nf of capacitor is placed on ADC input.

2) Why 49.9 ohm resistor is connected in series with SPI pins.

  • 0
    TI__Genius 9165 points
    Hello Gaurav,

    Please find my comments below.

    1. The R & C form a Low Pass Filter with cut off at 22kHz. This helps in reducing any high frequency noise from the source.

    2. The 49 ohm at the SPI pins is added to match the source impedance with the trace impedance. This helps with reduced reflections on the digital lines.

    Thanks & Regards,
    Shridhar.