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ADS7223: Input Pin sensing interference signal while conversion

Gene Qiu
Intellectual 1720 points
Part Number: ADS7223

Hi Team, 

Customer use ADS7223 to poll and collect 6 channels of single ended input analog signals. The schematic diagram of this part is as attached.

After each ADS7223 conversion, the input pin of each analog signal will sense the interference pulse signal as shown in below, and the interference pulse is generated at the falling edge of its corresponding BUSY signal. The interference of each path will only occur when the conversion of this path is completed, and will not occur when the conversion of other paths is completed.

There is no driver ahead of R/C for the input signal. 

The working Mode is set to Mode 1, and please see below register setting

Could you help to clarify what could be the reason to sense such interference signal at input pin?

Gene

  • 0
    TI__Mastermind 24970 points

    Hello,

    to make sure I understand correctly.

    You are seeing a spike at the input signal of a single channel. No other channel has this effect, correct?

    Do all channels have the same RC components at the input ? Does this happen at every input signal level? example, 1V, 2V ...

    At the end of a conversion, the mux has to change channels, the switch could produce effects on the input signal.

    Regards

    Cynthia