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LMP90100: What is the frequency stability of the internal clock?

Mark Pearson
Genius 12705 points

Part Number: LMP90100

My question pertains to the LMP90100MH/NOPB 24-bit ADC.

 

For our application, we’re using the ADC’s internal 893kHZ clock for sampling.  What is the frequency stability of this clock?

  • 0
    TI__Guru** 101115 points
    Mark,


    I'm checking to see if there's any data on the frequency stability of this clock. However, in the absence of data, I would say that if there are concerns about the clock frequency and it's relation to the operation, I would use an external clock source. A crystal will have much less variability.


    Joseph Wu
  • 0 in reply to Joseph Wu
    TI__Guru** 101115 points

    Mark,

    It looks like there was some characterization done on the internal oscillator frequency. Looking at final test data on just under 300000 units, the average frequency was 893kHz, with the great majority between 891 and 896, there are some flyers that push this out to 880 and 909, but those are removed by final test:

    Measuring units over temperature, there is also some variation as the temperature rises.

    Joseph Wu