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ADC12D1600QML: Calibration Time

Richard Katz
Intellectual 290 points

Hi,

I recently got my board with the ADC12D1600QML on it and I'm checking out -- just getting started.  I have used the evaluation board previously.

The ADC is being clocked at 1 GHz.  While I am not sure of the quality of the clock (the engineering doing the clock is just bringing it online) I am measuring the data clocks coming from the ADC at 250 MHz, as expected.

I tried giving the ADC a calibration pulse and measured the pulse initiating the cal and the calibration run time (CalRun pin).

The initiation pulse is about 6.4 us, but I am measuring a 328 ms pulse on the CalRun pin, which is far in excess of the specification.

We are just getting started and any thoughts, or something that we should look at next, would be appreciated.

Thanks,

Rich Katz

  • 0
    TI__Genius 17125 points

    Hi Rich,

    Are you running the part in ECM or non ECM.   If you are in ECM, remember that a cal can be initiated through Cal pin or the SPI.   Both the cal pin and the cal run register bit must be low before a cal can be initiated in ECM.

  • 0 in reply to Kirby Kruckmeyer96848
    Intellectual 290 points
    Hi Kirby,

    Thanks for the prompt response. We should be in non-ECM mode (ECE* held high; can confirm on the board when I get back into the lab tomorrow).

    The CALRUN signal gets asserted when I send the CAL pulse in. It just seems to be running quite a bit longer than expected, based on the spec (which I was told was really a maximum).

    So I want to pause and see what is happening.

    Cheers,

    rich :-)