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  • RE: LMP7721: LMP7721

    Hi Ayodhya, Ayodhya Weerakoon said: Recently I diagnosed that with the temperature of the IC the reading varies. Can you give a number? Please specify how much the reading varies. Is the voltage variation higher than the maximum temperature drift of LM4140…
    • Answered

  • RE: LMP7721: LMP7721 TIA design issues: Lost linearity (>1mA), oscillations (<10 nA)

    Resolved
    There is no easy way to measure 1nA change with 250ohm TIA as this implies 250nV resolution - see below. Changing the input current by 1nA from 1mA to 1.000,001mA would require resolution way below the input voltage noise of LMP7721. Simulating the input…
    • Answered

  • LMP7721: How to build a charge amplifier with fC resolution and low bandwidth?

    Resolved
    Part Number: LMP7721 Other Parts Discussed in Thread: TINA-TI , OPA210 , OPA928 Hello, I am not an electrical engineer but a chemical one. Therefore, my question is probably foolish/basic. I would like to build a circuit that is able to measure the fC charge…
    • Resolved
    • Answered

  • LMP7721: Can I supply bias voltage to input without buffer?

    Resolved
    Part Number: LMP7721 Other Parts Discussed in Thread: INA321 , TINA-TI Hi ti, I'm designing trans-impedance amplifier with LMP7721. In my application, the circuit need voltage bias to input. The circuit is below. In the simulation, the voltage…
    • Resolved
    • Answered

  • LMP91000: LMP91000 & LMP7721

    Resolved
    Part Number: LMP91000 Other Parts Discussed in Thread: LMP7721 Hello, I have Some Questions related 4 Electrodes Gas Sensor. Currently, I am working with LMP91000 & LMP7721. LMP91000 Configuration: ( WE,CE and RE ) VREF DIVIDER = 50% RTIA = 14K Rload…
    • Resolved
    • Answered

  • LMP7721: Input noise prevention for trans-impedance amplifier

    Resolved
    Part Number: LMP7721 Other Parts Discussed in Thread: TLV9161 Hi, team. I'm designing a trans-impedance amplifier using the LMP7721. The C2 and IG1 is a model of sensor. The sensor output is about 0.1~10 nA AC current. The constant bias of 1.2 …
    • Resolved

  • LMP7721: TINA-TI simulation

    TI Thinks Resolved
    Part Number: LMP7721 Other Parts Discussed in Thread: TINA-TI Hi Team, Our customer is simulated LMP7721 in TINA-TI for an electrometer application and would like to confirm if the simulation result is correct. According to our customer, I am using the…

  • LMP7721: We are looking for the lowest input capacitance (differential) in your product line

    TI Thinks Resolved
    Part Number: LMP7721 Also very low bias current. Goal to measure voltage across a sensing capacitor, displacement of charge. 1 pA bias current or less Cin 1 pF differential very low noise We wish to use this methodology to reduce the Cin https:…

  • LMP7721: Looking for alternative for isolated loop powered ph measurement

    TI Thinks Resolved
    Part Number: LMP7721 Other Parts Discussed in Thread: LMC6062 , OPA391 Hello, I am designing isolated loop powered pH measurement circuit, as I read through LMP7721 datasheet, its excellent bias current makes perfect for pH measurement. However, LMP7721…

  • LMP7721: lmp7721

    TI Thinks Resolved
    Part Number: LMP7721 Hello, In this question: https://e2e.ti.com/support/sensors/f/sensors-forum/912917/lmp91200-ph-electrode RE: the user supplied circuit diagram. The guard ring appears to be passive (not connected). The data sheet for lmp7721 8.1.1…

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