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ADS124S08EVM: ads124s08evm IDAC issue

Vivek Shirsat
Prodigy 20 points
Part Number: ADS124S08EVM

Tool/software:

Hey 
i want to just read/measure the current source in ads124s08evm from IDAC1 or IDAC2, i was doing it with configuration of IDACMUG with only putting below configuration

and also set the IDACMUX as I1MUX and I2MUX left as disconnected then i configure for i configure INPMUX (positive : AIN1) and Neg : AIN0

but while measuring the current (should come 1mA ) at pin A0 and A1 , it was coming 0.00 Ampere.

can you help me if i am going wrong..

  • 0
    TI__Guru 51846 points

    Hi Vivek Shirsat,

    Ensure that the ADC internal voltage reference is turned on as well. The IDACs are powered by the internal VREF, so the VREF must be turned on for the IDACs to work. Note that you do not need to select the internal VREF as the ADC reference source, just the internal VREF needs to be on

    This is described in detail in the datasheet. I strongly encourage you to read this document carefully before continuing with your design

    -Bryan