• 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
  • 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??

  • 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 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 (+/…

  • 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…

  • 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…

  • ADA4938 Output Termination for Driving SMA Cable


    I am trying to use ADA4938 as a differential driver for transferring signal from board to board (DC coupling through SMA cable). I am wondering what is the output impedance of ADA4938 when it's configured as a DC coupled differential driver? And…

  • ADA4938 not static CMRR at low frequencies

    We are reevaluating the use of the ADA4938. The CMRR is specified to be TYP: -75dB @ ∆VIN, cm = ±1 V, f = 1 MHz.

    The CMRR measured on an Eval Board with ADA4938 reveals, that the CMRR is strongly frequency dependent. (red curve: ADA4938, blue: ADA4932…

  • RE: 使用ADA4938驱动AD9204的问题


    2、ADA4938的输出电压与电源电压有关,单电源的情况下,因此单端输出电压范围最大为1.2V~1.4V(共模电压1.3V),如果采用双电源供电, 输出电压范围为 -VS+1.2V ~ Vs-1.2V

  • ADA4938-1的供电问题