PCM2706 PCM2707 commercial products

[anbello]

Anybody knows about commercial products which use PCM2706 or PCM2707.
I would like to buy one of this and modify to use as usb -> i2s interface to feed my diy dacs.
I built myself shuch a device with a pcm2707 and it works, but sometimes it stop playing on mains noise caused by turn on or turn off of nearby devices such pre, ampli, dac and i have to reboot the pc.
I circumvented the problem improving the mains filtering and eliminating turn on - off click and pop in my pre and ampli, but i never completly understood/solved the problem in the diy pcm2707 circuit.

So this is two question thread:
1) which commercial products with pcm270x?
2) which kind of problem/solution in my diy pcm2707?

For 2) i will post the circuit schematics and layout.

ciao
andrea

[anbello]

Schematics and layout.

For the pcm2707 i used an adapter from TQFP-32 to four 8-pin 0.1 spaced sockets as you can see from the image.

The layout has been only used as an aid to mount the components on a protoboard with blu wires soldered bottom an red ones top, and so is unusable to do a real pcb, for this purpose i am thinking to design a good layout and send it to olimex or others that make this kind of service. I appreciate any kind of suggestion for this.

ciao
andrea

[anbello]

ooooops

[morpheus82]

hi!why don't you order samples of pcm2902?(or pcm2906)?
ciao

[anbello]

Originally posted by raikkonen
hi!why don't you order samples of pcm2902?(or pcm2906)?
ciao

Because pcm2902-06 don't have i2s out, only spdif and i already have one sample of 2707 which i used in the circuit of posts 2 and 3 and it works but with the problem explained in post 1.

ciao
andrea

[morpheus82]

so it could also be a replacement for cs8414 receiver?

[anbello]

Originally posted by raikkonen
so it could also be a replacement for cs8414 receiver?

Yes, if your source have an usb port (tipically a pc full of mp3, ogg, wav, ... your preferred OS and your preferred mediaplayer).
No, if your source is a CD player with s/pdif out, in this case you can get rid of cs8414 receiver getting i2s directly from the Cd player (you need a service manual with schematics to see where you can get i2s).

ciao
andrea

[morpheus82]

sure, but pcm2902 allow the conversion from spdif to usb, and that's what i want to do, but some people say they tried without results...

[anbello]

Originally posted by raikkonen
sure, but pcm2902 allow the conversion from spdif to usb, and that's what i want to do, but some people say they tried without results...

I am not interested in the conversion from spdif to usb so i did not try with pcm2902, you can look at this:
http://hepso.dna.fi/misc/pcm2902/PCM2902_usb_dac.html
in the pdf on the "schematics" link you can see a connector "P4" with DIN and DOUT, these are spdif in and out at logic level, to convert to have real spdif you can use simple circuits explained here:
http://www.epanorama.net/documents/audio/spdif.html

ciao
andrea

[dsavitsk]

I have a PCB that uses the 2707 to get I2S out. You could certainly leave off most of it and sinply take the I2S signal from where the 1543 usually goes.

http://www.ecp.cc/HPDAC.html