Digital to Analog conversion in Multisim

Discussion in 'General Electronics Chat' started by xxxyyyba, Apr 21, 2016.

  1. xxxyyyba

    Thread Starter Active Member

    Aug 7, 2012
    Here is schematic for Analog to Digital conversion:


    Here are two Digital to Analog converters in Multisim:


    Which one should I use? I want to connect it at output of ADC to get original sine wave. How should I connect it (which pins should I use)?

    I found answer, however, other problem occurs :)
    Here is schematic with 8bit DAC:


    Here is transient analysis, showing input and output sine wave:


    What are voltage spikes at output signal?
    Last edited: Apr 21, 2016
  2. crutschow


    Mar 14, 2008
    D/A converters can have spikes in there output when all all the bits are changing at an MSB rollover due to the fact that the interal switches can't all change instantly .
    You need a low-pass filter or sample-and-hold at the output to smooth out the glitches.
    xxxyyyba likes this.