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Original question:

PCM1861: Does pcm1861 need input driving ?

PCM5242: Does pcm1861 need input driving ?

Timotei Fogorosiu
Prodigy 75 points
Part Number: PCM5242
Other Parts Discussed in Thread: PCM5102, LM111

hi but i the schematic uploaded...the agnd and dgnd doesn't need to be separated? it seems that it uses a single gnd on analog and digital?

  • 0
    TI__Guru 54043 points
    Hi Timotei,

    Not sure what exactly you are asking here. I would recommend that the AGND and DGND be connected, this can be done at a single point or with a single unified ground plain with the digital and analog domain separated by layout.

    Thanks!
    Paul
  • 0 in reply to Paul_Frost
    Prodigy 75 points
    hello ! so have a :adc 1861 and a dac pcm5102...

    so they are conected to a pic32 microcontroller...

    the question is: the microcontroller is separated from da adc and dac, however i have to cross with i2s signals and controll... someone told me that i should be using 2 separate power supplies...

    a lm111 we7dt for agnd and avdd and another one for pic32 dvdd and dgnd...should i do that?
    how do i connect the analog and digital grounds? and how do i connect avdd and dvdd?
  • 0 in reply to Timotei Fogorosiu
    TI__Guru 54043 points
    Hi Timotei,

    If you would like to have two LDOs providing an analog supply and digital supply, just ensure that there is good ground current return path to each respective LDO. I generally recommend a solid GND plane, with digital and analog components only separated geographically. A large, uninterrupted ground plane is best.

    Thanks!
    Paul