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ADC12DJ5200RF: Inquiry Regarding 'Device Functional Modes' in ADC12DJ5200RF

jeongju Go
Prodigy 120 points
Part Number: ADC12DJ5200RF

Tool/software:

Dear TI Support Team,

I have a few questions regarding the 'Device Functional Modes' section in the datasheet for the ADC12DJ5200RF.

[Question 1]
According to the datasheet, using INA in single-channel mode is recommended due to performance differences.
Could you please clarify how significant the performance difference is between INA and INB?

[Question 2]
If there is a performance difference between INA and INB, does that imply that ADC A and ADC B might also show performance differences in dual-channel mode due to the characteristics of their respective input paths?
If so, could you explain how noticeable or significant that difference might be?

Thank you for your support.


Best regards,
Jeongju Go

  • 0
    TI__Expert 6150 points

    Hello Jeongju,

    We have not validated the exact degradation of operating the ADC in DES mode and using channel B as the input. It is strongly recommended they use channel A as the input. This is due to the fact that only channel A is trimmed for DES operation.

    It will have no impact on performance in dual channel mode.

    Thanks,

    Eric

  • 0 in reply to Eric Kleckner
    Prodigy 120 points

    Hello Eric,


    Thank you for your response.

    We are currently evaluating a contingency scenario for the ADC12DJ5200RF, where INB would be used in Single Channel Mode in the event that INA becomes unavailable.

    In this regard, we would appreciate your insights on the following questions:

    [Question 1] Is it feasible to operate the device in Single Channel Mode using INB?

    [Question 1] If we were to use INB — which are not trimmed for Single Channel Mode operation — instead of INA, what level of performance degradation should we expect?


    Thank you for your support.

    Best regards,
    Jeongju Go

  • +1 in reply to jeongju Go
    TI__Mastermind 23760 points

    Hi Jeongju,

    Q1: You can enable channel B input for DES mode but it isn't advised.

    Q2: As Eric mentioned, channel B is untrimmed for this mode. This means that each unit will have differing results. As this was not characterized when the device was released, we cannot guarantee any max performance loss if using channel B as an input. You will have to take this action and determine over the amount of units which you test whether the performance degradation is acceptable. The loss could be near 0.5dB but it could also be near 5dB, or worse.

    Thanks