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  • OPA683: OPA683 versus OPA684 input offset voltage in TINA models

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    Part Number: OPA683 Other Parts Discussed in Thread: OPA684 I have been doing some TINA spice simulations with both the OPA683 and OPA684. The non-inverting input is connected to ground, and the inverting input is connected to a small signal input and…
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  • OPA684: Voh and Vol for the \DISABLE pin using those supply voltages ( +/- 3.3V)

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    Part Number: OPA684 I am using the OPA684 with Vs= +3.3V and Vs- = -3.3V . I cannot find the Voh and Vol for the \DISABLE pin using those supply voltages.
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  • RE: OPA691: OPA691: Optimum value of the feedback resistance for ±3.3V supply rail.

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    I had some previous sim files already set up, here is the OPA684 at gain of 10, Rf=900ohms - the models generally do not try to include much in the way of supply variation on AC results, I put it to +/-3.3V supplies for this app, but +/-5V would look…
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  • RE: THS3001: Correct configuration for DAC output

    Resolved
    Well Joaquin, number of issues here, 1. These comms DAC's are always complementary current output - they are steering a tail current (2mA) between two ouptuts - so you need to model that. 2. Normally, you want to use both output currents to get the…

  • RE: OPA838: RF – Small Signal Low Noise Amplification and Demodulation

    Morning Ryan, You sure have a lot going on here, without getting too deep into it couple of observations 1. Your high gain cascaded stages are broadband when you say you have a noisy environment - are you sure you don't want to do a little bit of bandlimiting…
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  • RE: THS3491: Zol test and parasitic capacitance of noninverting terminal questions

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    Hi Michael, I followed your method in the article to build this circuit: The Ri and L are calculated to be 4.2ohms and 73.9nH which is similar to yours. But as you can see in the next curves: PM=45.76° fxover=27.88MHz which is said to be 43Mhz in…

  • RE: THS4631: Closed loop Gain stability at 1MHz

    But by way of preview Tatarao, Your gain error at higher gains and 1MHz is just the response rolling off as it should. If you want better flatness through 1MHz and gain of 100, use a faster VFA or a CFA device like the OPA684.
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  • Analog Engineer's Circuit: Amplifiers-----Inverting summer circuit

    Resolved
    Other Parts Discussed in Thread: OPA683 , OPA684 hello: when i go through the pdf document of Analog Engineer's Circuit: Amplifiers, i can see the descrpition as below: can you explain why the first formula is 2.5V-(-2.5V), but the second formula…
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  • OPA695: Die difference

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    Part Number: OPA695 Other Parts Discussed in Thread: OPA684 Hi team, A customer want to confirm the difference of CLC401A and CLC401. can you help me to clarify it? Thanks. Regards,
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  • RE: WEBENCH® Tools/LM7171: LM7171

    I attached a TINA file with the op amp models in them. You only require 68V/usec slew rate, and a gain of 20V/V, look at the OPA684 for a +/-5V low power solution.

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