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  • OPA387: Want to use K-type thermocouple with OP amp.

    TI Thinks Resolved
    Part Number: OPA387 Other Parts Discussed in Thread: TLV333 Hello TI experts, My customer want to use OP amp with K-type thermocouple, to measure the temperature of the device. actually they used thermocouple to digital converters before, but now they…
    • Answered

  • OPA387: Stability - lower Riso increases stability?

    Resolved
    Part Number: OPA387 Tying to fine-tune a simple amplifier based on on OPA387 I found out that the higher Riso resistor value the lower the stability - see the diagram below, phase-margin(Aol)=61.5°@Riso=100Ω. When Riso is 51 Ω, phase-margin (Aol…
    • Resolved
    • Answered

  • OPA387: How can I purchase the pre-production parts?

    Resolved
    Part Number: OPA387 Hello, I would like to order a few pieces of POPA387DBVR. The website shows that stock is available, but will not allow me to add them to my cart. I tried asking customer support (online chat), and they were, unfortunately, completely…
    • Resolved

  • RE: OPA2387: OPA2387- OPA387

    Alferd, You are correct. There is a typo in OPAx387 datsheet - it should look as shown below.

  • RE: OPA4187：closed loop gain

    Hi Raymond-san, Thank you so much for your reply. You understand my scenario correctly. I can not use OPA387 because Dual supply of OPA387 is max ±2.75V. Dual supply of Opamp on PCB is fixed ±5V. I ask you a simple question again. Is it possible…
    • Answered

  • LMP2021: Prediction of Ib temperature drift

    Resolved
    Part Number: LMP2021 Other Parts Discussed in Thread: OPA387 , , TINA-TI I have a design that includes a high gain, low frequency amplifier for a low level, high impedance source. The source impedance is 1MOhm and the input level is several microvolts…
    • Resolved

  • RE: OPA378: Can you really use a chopper in a high gain Transimpedance design?

    Michael, You may simulate the OPA378 input voltage noise spectral density beyond 10kHz shown in the datasheet. Doing so shows 20nV/rt-Hz all the way to its 900kHz unity-gain bandwidth frequency - see below. However, I am not sure why would you use OPA378…
    • Answered

  • RE: PSPICE-FOR-TI: Simulating the OPAx387 produces outputs below the negative supply and above positive supply.

    Resolved
    Hi Eric, INA293/INA290 models are found in the link below. You may download them directly. Please note that there are many different models or choices. For Tina-TI, you need to pick TINA-TI REFERENCE DESIGN (ready to run simulation). PSpice Model is typical…
    • Answered

  • RE: OPA392: Accurate measurement of voltage from high impedance source

    Resolved
    I may be able to use 5MΩ signal source and accuracy >0.25% may be acceptable so I think this design has some chance to fly. I may also use OPA387 instead OPA392. It has much lower V OS within the entire V CM range. See screenshot below. Again, thanks…
    • Answered

  • RE: OPA391: accuracy

    Resolved
    I do agree that the OPA391 maximum offset voltage for Vcm close to positive rail could be handled better by showing higher maximum offset at low supply voltage. If you cannot use OPA325, perhaps you could use a micro-power OPA369, zero-drift OPA387, or…

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