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  • LMP7721: Questions about LMP7721 EVM design

    TI Thinks Resolved
    Part Number: LMP7721 Other Parts Discussed in Thread: LMP7715 I modified the components on the LMP7721 evaluation board as shown in the figure below to measure the voltage of an ion combination electrode. The voltage range is -0.5V to +0.5V. Due to the…

  • LMP7721: LMP7721 shows periodic output noise in TIA configuration

    Part Number: LMP7721 Other Parts Discussed in Thread: MSP430F6736A Hello TI team, I am using the LMP7721 as a transimpedance amplifier for low-current measurement in an electrochemical sensor readout system. The target current range is from pA to nA…

  • LMP7721: LMP7721 / LMP7715 Based AFE for pH and ORP Sensors: Guard Ring, Supply Architecture, and BNC Guard Signal Questions

    Part Number: LMP7721 Other Parts Discussed in Thread: LMP7715 , LMP91200 Hi everyone, I am developing a dual-channel analog front-end (AFE) for pH and ORP electrochemical sensors using components from Texas Instruments. The expected output signal ranges…

  • LMP7721: Electro-chemical sensor can not work with LMP7721

    Part Number: LMP7721 Tool/software: Electro-chemical oxygen sensor output connect to LMP7721, the output of LMP7721 is not right. (output is very high) Connect a current source to LMP7721, the output of LMP7721 is right. The output of electro-chemical…

  • LMP7721MAEVALMF_NOPB: LMP7721 EVM Wiring for ±0.5V Ion-Selective Electrode (Single Supply)

    TI Thinks Resolved
    Part Number: LMP7721MAEVALMF_NOPB Other Parts Discussed in Thread: LMP7721 , OPA392 , OPA397 We have purchased TI’s LMP7721 Multi-Function Evaluation Board. Without modifying the original board layout, I wired 5V to the V+ terminal and directly shorted…
    • Answered

  • LMP7721: Who supports LMP7721 and similar femtoampere amplifiers?

    Resolved
    Part Number: LMP7721 Tool/software: Hi, I have a customer looking for a femtoampere amp similar to AD4530-1. Who would be the correct amplifier team applications engineer to loop into an email? Best regards, Samiha PADC Applications Engineer
    • Resolved

  • LMP7721: OPA928 and LMP7721: feedback cap

    TI Thinks Resolved
    Part Number: LMP7721 Tool/software: I have a trans-impedance circuit with 100M and 2G feedback. I was required to add a capacitor in a limited space. the value would be 1300pF (or 2700pf) and 560pF. I usually select polystyrene, which has been popular…

  • LMP7721: LMP7721

    TI Thinks Resolved
    Part Number: LMP7721 Tool/software: Dear, My name is Yangyang Guan and I am from KU Leuven. I am currently conducting noise analysis on my device and interface circuit. Could you please provide me with the input-referred current noise spectrum density…

  • LMP7721: LMP7721 non-inverting input is not equal inverting input

    TI Thinks Resolved
    Part Number: LMP7721 Tool/software: hi, Dear PL engineer one thing need consult associated with LMP7721 as below. my customer want TI propose a circuit to testing x-ray energy. so I propose below charger amplifier. my customer then use LMP7721EVM…

  • LMP7721: Capacitance Problem when is power on first time has problenm second wotrks correct

    TI Thinks Resolved
    Part Number: LMP7721 Other Parts Discussed in Thread: ADS1255 , TINA-TI We use LMP7721 and AD1255 The issue when is poer on the first time the ADS1255 read woprng values when is power OFF and ON the system work well Our Application is for TIA , the…

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