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DDC264EVM: Difference between channel A and B

Jonathan Navor
Genius 9475 points
Part Number: DDC264EVM
Other Parts Discussed in Thread: DDC264

Tool/software:

Hi Experts,

I have a question about DDC264EVM software.

1. On the software, what is the difference between channel A and B
2. Another question is about the "nDVALID Read" on the software. The default setting for this parameter is 1024. When I save the data, I see there are 512 values for each channel in A and B. Does the average codes read on the software come from the average of the 512 codes?

3.Also, why are 512 values for each channel since the setting is 1024? Does it mean that 512 values for A plus 512 values for B equals the setting in "nDVALID Read"?
Do the 512 values for each channel arrange in chronological order? and each value's integration time is the same as it shows (such as 320 us)?

Thank you in advance.

Best regards,

Jonathan

  • +1
    TI__Mastermind 49866 points

    Hello Jonathan,

    1. The DDC264 contains 64 identical input channels that perform the function of current-to-voltage integration followed by a multiplexed A/D conversion. Each input has two integrators so that the current-to-voltage integration can be continuous in time. The DDC264 continuously integrates the input signal by switching integrations between side A and side B.

    2. Yes that is correct. Average code is the average of the 512 samples / codes.

    3. Yes, each nDVALID corresponds to a side A or side B. Hence the value in nDVALID Read is split between A and B sides.

    Yes, the 512 values / samples are arranged as time series data and yes, the integration time is same across samples.