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ADS1259EVM Schematic

Luis Filipe Rossi1
Prodigy 250 points
Other Parts Discussed in Thread: PGA280, ADS1259

At the ADS1259 Datasheet, it is recommended to connect the START pin of the ADS1259 to the GPIO5 pin of the PGA280 to use the BUFA output. However at the ADS1259EVM it is connected to GPIO4. Why thats done this way?

Regards,

Luis

  • 0
    TI__Mastermind 44680 points

    Hi Luis,

    I don't believe the ADS1259 is taking advantage of the BUFA trigger output to start ADC conversions. It seems to be using GPIO4 simply as a digital output to control the START pin.

    The advantage of doing it the way shown in the ADS1259 datasheet is that it simplifies the code and guarantees that the current buffer is enabled before switching MUX channels.

    So really there is no reason why it was done differently on the EVM, or I guess, to show that it can be done differently!

    Best Regards,
    Chris