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TMS570LS3137 ADC Stability

Rubina Josphine Bose
Prodigy 20 points
Other Parts Discussed in Thread: TMS570LS3137

Hi,

I am using ADAS3022 (ADC Board) interfacing with HDK, The output value (ADC converted value) reading from HDK was not stable, For example from the below table am giving input 5v for that am getting the output as 6FFC but it varies from 6EF0 to 6F0A

Input Voltage ADC value(HEX)
5 6FFC - it varies from 6FE0 to 6FFC
4.5 6F03 - it varies from 6EF0 to 6F0A
4 6335 - it varies from 632F to 6340

Please clarify, how to stable the data. Thanks in Advance

  • 0
    TI__Guru**** 196706 points

    Hi Rubina,

    If 12-bit resolution is used, the maximum output of the ADC is 0xFFF. The values you posted are out of the valid range (0x0~0xFFF).

    The analog conversion range is determined by the reference voltages: ADREFHI and ADREFLO. ADREFHI is the top reference voltage and is the maximum analog voltage that can be converted.

    What is VCCAD and VADREFHI in your setup?

    Can you try a large sample time to ensure the sample capacitor is fully charged?

  • 0
    Guru 92251 points
    Rubina Josphine Bose said:
    I am using ADAS3022 (ADC Board) interfacing with HDK

    Can you confirm you are using an external Analog Devices ADAS3022, rather than the internal TMS570LS3137 ADC?

    If so, is how get improved ADC stability really a question for Analog Devices support?