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  • RE: LMV881: R_ISO

    Former Member
    Former Member
    Hello Chuchen, We have several resources on this topic. The first is a TI Design (TIPD) that discusses the issue in depth. The second resource is a TI Precision Labs Op Amp Video/Slides set explaining the Riso method for maintaining stability with…

  • Problem INA155

    TI Thinks Resolved
    Other Parts Discussed in Thread: INA155 , TIPD128 Hello, i have a problem with the INA155, I have the circuit posted in the schematic. In the bottom part there is the reference use to create the Vref (400mV) on GND1 and at the input pin of the opamp i have…

  • RE: Need Buffer OP AMP Design to drive long high capacitance cables

    Hello Govind, There is a TI Precision Design that may be of help here. Please take a look at TIPD128.

  • RE: ADS1278 Vcom Buffer

    Check out the VCOM OUTPUT section of the datasheet regarding drive capabilities. As previously mentioned, a buffer circuit that is not just a simple voltage follower may need to be employed if you are driving a large capacitance directly on the output…
    • Answered

  • RE: Problems with INA122P

    Resolved
    Hi Fer Bar, Try removing the capacitors at the output of the INA122. Capacitive loads can cause a circuit to become unstable. Please see this TI Design on driving capacitive loads http://www.ti.com/tool/TIPD128?keyMatch=tipd128&tisearch=Search-EN.…

  • RE: OPA2322: capacitive load capability at unity gain

    Hello, I believe you are refering to the paragraph on page 14 of the datasheet discussing CAPACITIVE LOAD AND STABILITY. The paragraph states that the OPA322 will remain stable in unity-gain with a pure capactive load of 1nF. Figure 33 shows a graph for…

  • Open loop output impedance of INA129 and INA121

    Other Parts Discussed in Thread: INA121 , INA129 , TIPD128 Hi, 1. What will be the open loop output impedance of INA129 and INA121? 2. Is there a way to use the INA spice model and extract the model of 3 opamps inside these INAs seperately to check the…
    • Answered

  • RE: INA326 for High side current sensing - 1uA to 150mA

    Resolved
    Hello Anil, Thanks for the new schematic and clarification. My only additional comment is that C105 is large and may cause stability issues for the OPA313. According to the OPA313 data sheet (Figure 21) you should reduce it to 50pF to maintain 45degrees…

  • RE: OPA2188 - Gain peaking at 200kHz

    Hello Ryuji, I would expect some gain peaking with the circuit you have described. There are three causes to the gain peaking; a capacitive load of 100pF and 1000pF, large feedback resistor (100kohm), and a capacitor on the inverting input of the op amp…

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