Capacitors for PCM1716 DAC chip

[Oystein]

I am tweaking my NAD 524 cd player as much as possible.
I already installed a Tentlabs clock; Burson Op-Amps, replaced signal capacitors and all this was already a big revelation to me.

Now I am going a step further going troug the powersupply and more.

There is one subject I have to ask your opinion / experience:
The analog out from the DAC chip has the signal ground EXTL and EXTR connected to ground by a capacitor. (pin 11 and 18)
I can imagine that the quality of this capacitor can influence the output signal.
There is very little space around but if I want to fit a MKT in there it must be smaller value (2,2 uF instead of 10 uF).
Does anybody know the exact funtion of these acapacitors ?
The 10 uF are now standard miniature Elco's.

Any feedback is highly appreciated.

Thanks, Oystein

 

[Fenris]

Looking at the datasheet, it looks like they're related to the low pass filter for the analog portion of the DAC's output. I'd recommend bypassing (not replacing) with a 0.1 to 1 uF film cap. The bulk capacitance is needed for frequency response, but can be improved with a bypass cap. Solder to the underside of the PCB if there's no room to make it fit.