Multisim, Digital - Analog ground in one schematics

Discussion in 'Electronics Resources' started by BAJA, Aug 9, 2010.

  1. BAJA

    Thread Starter New Member

    Aug 9, 2010
    Hi everyone.

    I'm new using Multisim, and I was trying to simulate AD7545, but it uses 2 differents grounds, and i don't know how to do this. In the datasheet the circuit I was trying to simulate is the one in Figure 5 in the datasheet, but I wasn't successful to getting to work.

    Any help you can give me, it will be very welcome
  2. kingdano

    Senior Member

    Apr 14, 2010
    have you tried simply using one ground in your sim?

    a lot of times those notes are for physical board layout use, due to ground loop currents.

    post your schematic as you tried to simulate, as well as the error - people may be able to help better.
  3. StayatHomeElectronics

    AAC Fanatic!

    Sep 25, 2008
    Definitely use a single ground in the simulation.

    Even when the boards are made the grounds will need to be connected at some place in the system. There are guidelines in the datasheet on page 5 under General Ground Management.

    Here is one of their suggestions:

    The simplest method of ensuring that voltages at
    AGND and DGND are equal is to tie AGND and DGND​
    together at the AD7545.

    That is a very common way to design a board...