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  • 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…

  • OPA857: Why there is no amplify input signal?

    Part Number: OPA857 Other Parts Discussed in Thread: TIDA-00663 Hi team, customer designs OPA857 but why the output signal is smaller than input signal? Is there any problem in their testing or circuit, please advise? Ch1: pin15 Ch3: pin8 Their MCU GOPI…

  • OPA857-DIE: Transimpedance amplifier

    TI Thinks Resolved
    Part Number: OPA857-DIE Other Parts Discussed in Thread: OPA857 , , OPA855 , LMH32401 , OPA858 , OPA859 , OPA856 Hello, I was wondering if there are any experimental/test data about this device? I would expect the input capacitance to be affected by the packaging…

  • OPA857: How much time does it need to recovery its output saturation?

    Part Number: OPA857 Other Parts Discussed in Thread: TINA-TI Hi team, How much time does it need to recovery its output saturation? We will use this device with large pulse input and then OPA857 output would be saturated. We need its recovery time between…

  • OPA857: Increasing sensitivity of OPA857

    Part Number: OPA857 Other Parts Discussed in Thread: TIDA-00663 , Dear All, I started from the reference design TIDA-00663. For the photodiode I use the SFH 2400 (wider spectral response) instead of the SFH 2400FA (only sensitive in infrared). The laser…
    • Answered

  • OPA857: TINA AC Simulation

    Resolved
    Part Number: OPA857 Hi, I am using TINA-9 to simulate some basic OPA857 circuits. When i do a AC simulation based on the example downloaded from the TI website i am receiving the plot shown below. Unity gain is reached far above 10 GHz which doesn't…
    • Resolved

  • OPA857: OPA857 schematic review

    Part Number: OPA857 Dear team, Would you kindly help review the schematic of OPA857? Thanks. Thanks. Best regards, Sammi

  • RE: TIDA-00978: when the voltage of D1-pin2 exceed 24V, the output voltage of OPA857-pin8 will be 0V, why?

    Hello, Pin 15 should not be close to VAPD due to the diode in between the bias voltage and the input of the amplifier. Are you disabling test mode by setting Test_SD = GND and Test_In = +VS? Also would you be able to measure the current output out of…

  • WEBENCH® Tools/OPA857: PSPICE

    Part Number: OPA857 Other Parts Discussed in Thread: THS4541 , Tool/software: WEBENCH® Design Tools Is there an actual device level simulation model available for devices such as the OPA857 or THS4541? It seems that the existing ones are largely behavioral…

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