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  • OPA857: Could not get an output

    Part Number: OPA857 Other Parts Discussed in Thread: OPA693 Tool/software: I am designing an amplifier to amplify the signal from a photomultiplier tube (PMT) and digitize the output using a standard digitizer. I used a circuit incorporating the OPA857…

  • OPA857: Balanced photodiode configuration

    TI Thinks Resolved
    Part Number: OPA857 Other Parts Discussed in Thread: OPA855 , OPA856 Tool/software: Hi Experts, I'd like to know what would happen if the OPA857 is connected to a balanced photodiode configuration. This means that the OPA857 will have sink and source current…

  • RE: OPA857: Output of OPA857 staying constant.

    Hi Ankur, If you are referring to the configuration with a 5kohm on R268 with 2.5V on the left pad, then yes, the current going through the device across the feedback pin is around 0.14mA like you're calculating. With the APD, did this latch up behavior…

  • OPA857: Schematic review, customer find abnormal noise floor

    Part Number: OPA857 Tool/software: Dear expert, My customer is using OPA857, but find a abnormal noise floor, could you help to review the schematic BR Chi

  • RE: OPA857: Undershoot with OPA857 and THS7530 amplifier chain

    Dear Alec, Still workign on the suggestions of Ignacio. I will update with the results. Bests, Farzin

  • OPA857: Input Current/Voltage Noise Density

    TI Thinks Resolved
    Part Number: OPA857 Hi, A TIA circuit was designed using OPA857, and Input Voltage Noise Density and Input Current Noise Density values are required for noise analysis. What are the Input Voltage Noise Density and Input Current Noise Density values of…

  • OPA857: AC Coupled Operation of OPA857

    Part Number: OPA857 Can the OPA857 be used with an AC-coupled signal? i.e. can I connect a cap between the photodiode and the TIA input to reject DC? Will this affect stability?

  • OPA857: What to do with the IN pin in test mode?

    Part Number: OPA857 Dear E2E team I'm trying to evaluate an OPA857 using its built-in test block. This is the circuit I built: For the first test I closed J2, pulling so TEST_SD to GND. JP1 was open, so IN was floating. Under these conditions I was…
    • Answered

  • OPA857: injecting test current

    Resolved
    Part Number: OPA857 Hi, I've been trying to test my design using the OPA857 by injecting current from an ideal current source into the IN pin of the OPA857. However, whenever the probe for injecting current touches the net that connects to the IN pin…
    • Resolved

  • OPA857: low-noise alternative

    TI Thinks Resolved
    Part Number: OPA857 Other Parts Discussed in Thread: LMH32404 , LMH32401 , OPA818 , OPA859 Hello, team. Could you please suggest, do we have any updates of OPA857 device? Customer is wondering if we can propose any modern alternative with better noise specs…

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