• RE: Spice Opamp model noise

    Hi John,

    Thank you for your question. I have tried AD8676 noise simulation in Multisim and produced the same results as yours. I believe that the AD8676 noise model has an issue and that I will forward this to the group that modeled the AD8676 SPICE…

  • RE: SPICE model for OpAmp Noise

    Hi Kapati,

    Apologies for the delayed response. The AD8676 spice model  is currently being modified. For the meantime,  you may use the AD8675 model instead. AD8676 is a dual of AD8675.



  • AD5791 Reference Buffer Opamps

    The data sheet and reference designs recommend the AD8676 for voltage reference buffers.  I would like to use an opamp that draws less supply current than the 3.4mA max of the AD8676.  The ADA4077-2 looks to have similar performance specs, and draws only…

  • AD8676 Input Resistance

    Is there a specification for the AD8676 input resistance? The data sheet does not have one that I can find.

    The data sheet for AD8675 (single vs. AD8676's dual package) has input capacitance, but no input resistance.

    Thanks for any help.

  • AD8676 Voltage phase reversal

    I have a question about AD8676.
    #1, Does AD8676 will occur "phase reversal" when the input voltage exceed input common mode range?
    Some data sheet say "No phase reversal…

  • AD8676 output impedance


    I am going to use an AD8676 as a follower due to its very low noise voltage density as low offset voltage.

    The AD8676 is loaded by a AD4932 to convert the previous voltage from single to differential ended signal in order to drive AD7960 ADC.

  • RE: AD5791 with AD797 as Vref buffer oscillation



      There is a reason why we suggest the AD8676 and AD8675 on the AD5791 data sheet.

    If you have not done RF/microwave pcb's, the AD797 is extremely difficult to tame.

    You need a clean four layer board with all metalization removed below the inputs…

  • RE: cn-0209


        That was a very helpful piece of information.Thanks.

    1. If I select voltage signals for both channel1 and channel2 ,the voltage will pass through the ADG1414 and then to AD8676.But in this case ,won't the voltages overlap?
    2. I want to modify…
  • RE: AD8676 Pspice Noise model

    Hi Roberto,

    I have simulated the noise performance of AD8676 and the results were similar to your data. I have forwarded this to the Applications Engineer of AD8676 and he confirmed that SPICE model has an error after he simulated the part himself. He…

  • AD8676 Current limiting resistor


    I have three question about AD8676 Current Limiting resistor.

    #1  Is there Internal protective circuit in AD8676?

          (for example, Protection diode)

    #2  Is the input current limiting resistor necessary?

       (for examnple, IN a case beyond the differential…