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  • OPA4991: Error review of current measurement circuit using shunt resistor

    Resolved
    Part Number: OPA4991 Other Parts Discussed in Thread: OPA4186 , OPA4196 , OPA4197 , OPA4H199-SEP Tool/software: Hello? I'm writing this article because debugging a current measurement circuit using a shunt resistor, but the output instability has not…
    • Resolved

  • OPA4991: Simulating a non-GND reference input impedance

    Part Number: OPA4991 Tool/software: Hi Folks, I'd like to understand the proper way of simulating the input impedance to an Amplifier circuit (Specifically an OPAx991) where the reference node is not GND but rather the non-inverting input. Here's the…

  • OPA4991: Quasi-LOG Configuation

    TI Thinks Resolved
    Part Number: OPA4991 Hi Folks, Has anyone ever examined using 2 channels of an OPA4991 to create a quasi-log amplifier for TIA applications? Sort of like this: Curious if anyone has previously explored this? Thanks, -Chris

  • OPA2991-Q1: Is the OPA4991-Q1 a mirrored die of the OPA2991-Q1?

    Part Number: OPA2991-Q1 Other Parts Discussed in Thread: OPA4991 , OPA2991 Tool/software: Is the OPA4991 quad op amp a mirrored duplicate die of the 2991 dual op amp with shared references? Thank you, Cole

  • OPA4991: OPA4991IPWR Performance problem

    Part Number: OPA4991 Hi 24V passes through the 4mA constant current tube and resistor to the in-phase output end of the op amp. 4mA current flows to +15v of the op amp. The current cannot return to +15V. Could you please help confirm the cause Thank…

  • OPA4991: Supply Voltage

    TI Thinks Resolved
    Part Number: OPA4991 Hi, I want to use OPA4991 as an inverter amplifier. In the datasheet recommended operating voltage is +4.3V while absolute maximum is +5.5V. We want to use +/-5V, but we have concerns like if it will burn the opamp at some point whether…

  • OPA4991: Isc over 100mA

    TI Thinks Resolved
    Part Number: OPA4991 Other Parts Discussed in Thread: OPA4310 HI SIR Now, i use the OPA4991 in my circuit,but I need a Isc more than 100mA in other application Did you have any advise? thanks?
    • Answered

  • OPA4991-Q1: Maximum limit of feedback resistor value for voltage follower circuit

    Resolved
    Part Number: OPA4991-Q1 Other Parts Discussed in Thread: OPA4991 Hello, I am designing OP AMP circuit that circuit uses OPA4991-Q1. I will use OPA4991-Q1 for voltage follower circuit under below conditions. IN+ pin : Connect 4/5 voltage divider…
    • Resolved

  • OPA4991: Glitch in the output

    TI Thinks Resolved
    Part Number: OPA4991 Other Parts Discussed in Thread: TINA-TI Hi Team, Our customer simulated the OPA4991 sinewave generator circuit and noticed some glitches in the waveform. The supply voltage are +/-5V. Please see the schematic diagram and waveform…
    • Answered

  • OPA4991-Q1: Differences between OPA4991TQPWRQ1 and OPA4991QPWRQ1

    Resolved
    Part Number: OPA4991-Q1 Hello, I cannot work out what the difference between the OPA4991TQPWRQ1 and the OPA4991QPWRQ1. The difference is that a T has been added after the 4991. I have been through the whole datasheet multiple times and not seen any explanation…
    • Resolved

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