• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 184 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DAC8742H: use case of TX_AMP

Atsushi Hirai
Expert 4020 points
Part Number: DAC8742H

Hi team,

Under what circumstances would the TX_AMP amplitude adjustment feature be required?

Please advise.

Thanks,

  • 0
    TI__Expert 4280 points

    Hi,

    The TX_AMP field is able to be configured in order to provide greater flexibility for the HART output to make up for resistor tolerances or error in the V-I conversion stage. This can allow customers to use cheaper resistors with less precision since they can adjust the TX_AMP to have their desired output.

    Thanks,
    Lucas

  • 0 in reply to Lucas Burnette
    TI__Expert 4020 points

    Lucas-san,

    Which resistor do you mention?

  • +1 in reply to Atsushi Hirai
    TI__Expert 4280 points

    Atsushi-san,

    Some customers attach the HART output to a circuit to either reduce the Vpp to a much smaller value or directly convert the output to a current output. By allowing the HART output amplitude to be adjustable, if there is error in the resistors and capacitors in the circuit, it can be countered by adjusting the TX_AMP. This also means resistors with less precision can be used if needed for cost.

    Let me know if you have any other questions,
    Lucas