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ADC12D1600QML, Calibration Cycle, and Inputs

Hi,

I have a few questions about the calibration of the ADC12D1600QML.

After the application of power, and PDI and PDQ are deasserted, does the device automatically enter a calibration cycle?  Is another calibration cycle necessary and, if so, is there any requirement to wait a certain time after power and the clock signal is applied?

In the board design that I'm working with, the inputs are DC coupled and are driven by a single-ended to differential amplifier.  This amplifier is powered down when I initiate a calibration cycle.  At that point, the inputs to the ADC are 0 volts.  Is that OK?  Should I recalibrate after the amplifier is powered up?  The design is such that the TI ADC is powered on prior to the amplifier, and the amplifier is powered off before the TI ADC is powered off.

Thanks,

Rich :-)

  • The ADC12D1600QML different from the other ADCs in this family. It never automatically enters a calibration cycle. A calibration cycle must be initiated by the user either with the cal pin or the SPI registers.

    There is no problem with running a calibration with the inputs at 0 V. We recommend that the calibration is not done with a strong narrow band input signal. However, on the bench, I really have not seen much difference in the calibration with any type of signal on the inputs.

    The calibration can be started any time after the part is powered up and the input clock is started. However, it should be calibrated after the part temperature has stabilized.