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AMC7836: application question for AMC7836

Dane Zhang
Expert 7625 points
Part Number: AMC7836

Hi team

  1. The 7836 datasheet only has the load capacity at room temperature, is there a curve for more other temperature range?
  2. The Datasheet shows that the load capacity of the AMC7836 single-channel DAC is about 40mA. If our 16 DACs all output 40mA (16*40=0.64A) at the same time, will there be any potential problems except that the junction temperature of the chip cannot be exceeded?

  • 0
    TI__Guru 53773 points

    Hi Dane,

    1. I do not have that data available, but it is important to clarify that we do not expect the output impedance to change much across temperature, so the load regulation component of the output amplifier will stay the same.  What will shift is that we would expect the short-circuit current (~40mA) to change.  Generally we see it shift around 5mA across temperature.

    2. There is no problem with having all the DACs in short-circuit condition, except the thermal effects.  If the customer wishes to avoid this condition, they could try updating the DACs individually, rather than simultaneously.  For example, if you have a large cap load on all the outputs and set all the DACs to change simultaneously, then you would expect them all to reach their short circuit limit until the caps are charged to approximately the final value. By updating the DACs individually or batches, you could limit the number of channels in short circuit condition.

    Thanks,

    Paul