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TLV2781 application

Kuo Nowal
Expert 2315 points
Other Parts Discussed in Thread: TLV2781

Hi sir,


Currently my customer use HT9291 design schematic. Survey TI's OP, I think TLV2781 can replace.


May I know the circuit can implement application?

  • 0
    TI__Mastermind 18900 points

     

    Hello Kuo,

    You are correct; the TLV2781 can replace the HT9291 for this application.

    I would like to point out that R26 and C17 given in the schematic may not be required in the next iteration of the design. Assuming they are meant to cancel the offset voltage produced by the input bias current of the op amp, the voltage produced without these components may be negligible. The large resistor in the feedback path like this has a change to interact with the output capacitance of the op-amp and make it unstable—which C17 may be compensating for. Removing them may achieve the desired result and save space on the board.

    Please refer the John Caldwell’s blog titled: “Resistors in the feedback of a buffer: Ask why!” and Bruce Trump’s blog titled: “Input Bias Current Cancellation Resistors-do you really need them?” for calculations and detailed information on the topic.

    If you’d like to learn more about bias current, offset voltages, or many other topics, please check out the TI Precision Labs for a number of on demand videos.

    Best,

    Cole