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Original question:

ADS1256: Setting up the SPI Logic Analyzer for ADS1256

ADS1256: When to enable the internal buffer and its effects on ADC performance

Khoi Ly10
Intellectual 620 points
Part Number: ADS1256

Hi Chris,

I wonder if op amp buffering for the ADS1256 input is necessary and when do we use it for optimal performance

Thank you,

Khoi Ly

  • 0
    TI__Mastermind 44550 points

    Hi Khoi,

    You are referring to the ADS1256's internal input buffer, correct?

    Enabling the ADS1256's internal buffer increases the input impedance of the ADC, is also causes a slight increase in noise. It is needed when using high-output impedance sensors, as the sensor output-impedance will interact with the ADC's input impedance and form a voltage divider (i.e. gain error). Unless your input source is already buffered, then I would usually recommend enabling the internal buffer.