• exact value of the differential output impedance of the ADA4938-1 or ADA4938-2

    What is the exact value of the differential output impedance of the ADA4938-1
    or ADA4938-2. Is it 2ohm or 5ohm or 20ohm?There are S parameter plots S11 nad
    S22 in the datasheet but I don't know to which circuit they apply to or to
  • Simulation Problem of ADA4938-1


    Dear Emman.A,

             I want to use ada4938-1 to drive the ADC ad9629, before we start the design,  I do the simulation of ada4938-1, but I met some problems when I do the simulation. 

    software: Orcad PSpice

    the steps of simulation:

        First , I get…

  • ADA4938-1的供电问题


  • What is the impedance of ADA4938-1 in Power-Down mode

    I intend to multiplex the outputs of two ADA4938-1 devices into an ADC type LTC2387-18; I want to confirm this is possible using the Power-Down feature or I have to include a dedicated multiplexer.

    Thank you.

  • Questions about ADA4938-1 and ADL5562 for using ADC driver circuit of AD9648


    My customer will use AD9648( ADC  )and ADL5562 (ADC driver) in their product.

    And they want to add additional amp. (ADA4938-1) for compensating  Gain value at the frond-end of ADL5562.

    Q1) Would you advice your opinions about  using 2 op amps at the…

  • ADA4938-1:  Can I leave PD pin unconnected?

    If the powerdown feature is not to be used, can the PD pin be left unconnected?


    Yes it can.
  • Correct operation of ADA4938-1...

    I would like to ask if it is possible to use Cf - capacitors parallel to Rf - resistors in feedback like with AD8138 (Figure 42. Circuit Definitions in datasheet) with this differential amplifier (ADA4938-1)? Will be it stable? I want to use it like…

  • Difference between ADA4938-1ACPZ-R2 and ADA4938-1ACPZ-R7

    Is there any difference between the part numbers  ADA4938-1ACPZ-R7 and ADA4938-1ACPZ-R2 other than the sample ordering quantity?

  • ADA4938-2 problem


    I have a confusing problem with ADA4938-2. I connected ADA with unity gain and dual supply to AD9253. Vocm is provided by ADC. Schematic and parts values seem to be correct but output of ADA is very noisy. Any suggestion??

  • ADA4938 common mode setting


    i am confused about the common mode voltage setting of ADA4938 differential OpAmp. As mentioned in the datasheet we would like to set the output common mode voltage via OCM input and an external resistor devider. The OpAmp has dual supply (+/…