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ADS131A04: the sample data is bigger than the theoretical value

user4996218
Prodigy 10 points
Part Number: ADS131A04

hello everyone, i ues external reference and Vref=2.5V, the spike of ADC input singal is 700mV, frequency is 1k, so the max theoretical value of sample data is about 32767/2.5*0.7=9175,but when i resolve sample data, the value is 16820,which is bigger than 9175,the status and configuration of adc is ok,why it is happened?
asynchronous interrupt mode is used, adc data width is 16, ADC Fclkin = 16.384M, a_sys_cfg = x"0b60", d_sys_cfg = x"0c3c", clk1_cfg = x"0d02",clk2_cfg = x"0e2b",so the fmod = 4.096M and fdata = 32k. adc gain set is 000. (gain = 1)

  • 0
    TI__Guru 66256 points

    Hello,

    Thanks for your post and welcome to our forum!

    Let me ask a few questions for clarification:

    1. Are you using a custom circuit design for the ADS131A04? If so, can you please share a PDF schematic?
    2. What type of signal are you applying to the input? Is it a 1 kHz sine wave with a peak amplitude of 700 mV?
    3. What are the register contents? Please provide the 8-bit hexadecimal value.
    4. Specifically, what gain setting are you using (ADCx Register 11h to 14h)?

     

    Best Regards,