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ADS1220: Is this chip suitable to measure INL or DNL of Digital Analog Converter?

Duckhyun Kim
Prodigy 10 points
Part Number: ADS1220


Dear TI company,

Hello I am a student studying for CMOS analog circuit.

I have developed(fabricated) my chip for 10-bit R-2R core DAC chip by TSCM fabrication.

I want to measure INL or DNL of my DAC chip, so I am going to use ADS1220 & MSP430F5538.

but because this is my first time to measure INL or DNL of DAC, I cannot make sure that this ADS1220 chip is suitable to measure INL or DNL of digital analog converter.

I think that ADS1220 has so many functions for measure only temperature sensor..

In TI company, is there any other suitable to measure INL or DNL????

Thanks

  • 0
    TI__Guru** 113765 points

    Hi Duckhyun,

    Welcome to the E2E forum!  There are a few things that should be considered.  One is the output range of the DAC (voltage range, assuming a voltage output DAC) and the level of accuracy required in the measurement.  With precision devices we would use a 3458A calibrated voltmeter to make the INL/DNL measurements.  When using an ADC you will need to make sure the output of the DAC is within the measurement range of the ADC and that the ADC is calibrated to account for offset and gain error.  Drift will also be a consideration as the reference may drift as well as the offset.  One further consideration would be the INL/DNL of the ADC.

    For the DAC, there will be some reference voltage relative to the output voltage.  You should also account for the drift of the source as well.

    If the DAC output is within the measurement range for the ADC, then you need to determine if the ADC can deliver the desired accuracy for your measurement.  As the DAC is 10-bit, you should be able to measure a reasonable DC performance with the ADS1220 depending on the DAC output voltage range.

    Additional information regarding the DAC would help me to be more conclusive.

    Best regards,

    Bob B