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ERROR IN ADC OUTPUT FOR SMALL VALUES

jijo jacob
Prodigy 50 points

Other Parts Discussed in Thread: AM3359

SIR/MADAM

I am doing my project on ICE AM3359 and using CCS v6.1.2 , SDK version 2.1.1.2 . I am trying to read analog value,using ADC sample project. But as the value gets smaller the error from the ADC output increases. I am using channel 1 for reading the value.

Can anyone help me out of this

REGARDS

JIJO JACOB

  • 0
    TI__Expert 7570 points

    Hi

    The AM335 has a 12 bit ADC with performance that is outlined in section 5.10 of the data sheet which can be downloaded from the product folder at: www.ti.com/.../AM3359 .

    Is the input a AC or a DC signal?  If it is an AC signal, what frequency are is being used?

    If the signal that is measured greater or less that expected?  If the signal is greater than expected it could be due to noise. The steps to reduce noise in the input are to: use a differential Input configuration, use shielded (balanced) cables vs twisted pair wire, and input filtering of out of band of interest noise using active or passive filters.
     
    It is also important to take into account the performance limits of the test equipment that is used to evaluate the ADC .

    David