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DSD1792A: DSD1792A Decoupling Cap

Garret Holt
Intellectual 1050 points
Part Number: DSD1792A

Hi Team,

The typical application of DSD1792A is shown below with two 47uF decoupling caps on the VcomL and VcomR lines. How was the value of 47uF calculated and what would be the effect if the value of these caps was drastically decreased to 0.47uF? Is there a part number for a suggested cap to be used here?

Are these caps used for supply decoupling or are they functioning like the input capacitor for a buck converter (Class D amp)?

Also do the left and right channels operate independently? What degree of isolation is there between the two channels?

Regards,


Garret

  • 0
    TI__Guru 53443 points

    Hi Garret,

    The VCOM pins are actually reference voltage outputs.  The caps are there for noise filtering and stability of that voltage output.  The device will probably work with 47nF on the pins, but I suspect the low frequency noise will be higher.  I would just recommend using a the largest cap you can still put on the same pads, if 47uF is not possible.

    We do not have a channel-to-channel crosstalk/isolation specification for this device, so it is difficult to say what that performance would be.  It should be less than the channel-to-channel gain mismatch, though.

    Thanks,

    Paul