• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 49 subscribers
  • Views 244 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.

LMH34400: Is it OK for LMH3440 being a TIA to convert small current of photo diode to voltage

Jerry Wu
Prodigy 110 points
Part Number: LMH34400

Is it OK for LMH3440 as a TIA to convert small current of photo diode to voltage?

The output of LMH3440  is 1Vp-p, would you please suggesst me what kind of OPA is suitable to output 2V for this photo diode detection application

  • 0
    TI__Intellectual 1080 points

    Hi Jerry,

    Thank you for your question. Yes theLMH34400 is a great choice as a TIA for small current to voltage conversion and it does have a maximum output swing of 1Vp-p. For a device with similar integrated features, the LMH32401 is a similar device but features a fully differential output and slightly lower integrated gain at either 2kΩ or 20kΩ, and has a maximum output swing of 1.5Vp-p.

    As a discrete option, the OPA855 allows for a full 3Vp-p output swing and is also a transimpedance amplifier. It is a decompensated amplifier with a minimum gain requirement of 7 V/V. For a unity-gain stable option, see it's variant the OPA859 which allows for 2.5V-p-p output swing. 

    All of the devices listed above are great for photodiode applications and can be selected from based on your specific system parameters. 

    Thank you,
    Rachel