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ADS1259: Pin termination

Dennis McGlumphy
Expert 1390 points
Part Number: ADS1259

In the data sheet for the ADS1259 it says the SYNOUT pin is an output pin but when in power-down mode it is an input pin.  I'm not using the SYNOUT output and I don't intended to use the power-down feature.  For EMC considerations, would it be advisable to terminate the SYNOUT pin with a 1M resistor to ground?   In addition, I'm not intending to use the RST/PWDN pin.  Should this pin be pulled high with a 10K resistor?  Thank you. 

  • 0
    TI__Mastermind 44550 points

    Hi Dennis,

    Yes, and yes...

    I don't believe the SYNCOUT pin provides any functionality when it is in the "input" state. It's consider to be a digital input in power-down because is is not actively being driven. However, I think it is still a good idea to provide a pull-down resistor to prevent it from floating. You could certainly use any pull-down resistor value you want if you never plan to enable the clock output on this pin.

    For the nRST/nPWDN pin, I would recommend using a strong-up up resistor to DVDD so that EMI has little effect on this pin. Since this is a high-impedance digital input, there would be no problem using even using a 0 Ohm pull-up resistor. Anything between 0 and 10k is probably fine though.