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AFE11612-SEP: Noise or Interference

Hridya TV
Prodigy 90 points
Part Number: AFE11612-SEP
Other Parts Discussed in Thread: ADC128S102-SEP, DAC5675A-SP,

While analyzing the IC datasheet and comparing it with the other ADCs and DACs available in the TI product selector list, some queries were raised.

Kindly provide a solution for the same.

Application: For controlling and monitoring the signal of a power processing unit for a Hall Effect Thruster.

Clarification:

  1. Is the accuracy of the IC dependent on the temperature, since the IC has an inbuilt temperature sensor, or is it a feature?
  2. Whether there is high power dissipation and thus higher temperature rise?
  3. Even though the functionality is more for AFE11612-SEP compared to the ADC and DAC such as ADC128S102-SEP, ADC128S102QML-SEP, DAC5675A-SP, etc., why is there a significant difference in the cost aspect? Could you please explain it.
  • 0
    TI__Expert 8260 points

    Hi Hridya,

    1) The built-in temperature sensor is a feature. The device will not change the output depending on the temperature. 

    2) You can see power dissipation characteristics in the datasheet. When the DACs are unloaded, max power consumption is 120mW. Low power consumption was not a concern when developing this device, but it will not disproportionally increase temperature. Note that the device is quite large and has a large thermal pad. These help keep the temperature low.

    3) The difference in price comes from the rating. -SEP has less radiation tolerance than -SP. That's why the AFE costs less than the DAC, even though the AFE has much more functionality. 

    Thanks,
    Erin

  • 0 in reply to Erin Bowrie
    Prodigy 90 points

    The information i received from the TI support team Banglore says that the IC is dependent on temperature and thus it will affect the performance of the Chip.

  • 0 in reply to Hridya TV
    TI__Expert 8260 points

    Hi Hridya,

    I see what you were initially asking now. If the device heats up, it will experience feature drift over temperature. You can see how much temperature drift there is in the electrical characteristics table.

    Thanks,
    Erin