diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Digital Source (http://www.diyaudio.com/forums/digital-source/)
-   -   replace DAC (http://www.diyaudio.com/forums/digital-source/117509-replace-dac.html)

maxpou 15th February 2008 05:21 PM

replace DAC
 
Hi Guys,
somebody can tell me if possible to replace the KDA0316 DAC by PCM1754. Thank You! Maxpou

http://www.datasheetcatalog.com/data.../KDA0316.shtml

http://www.datasheetcatalog.com/data.../PCM1754.shtml

ESS_Blammo 15th February 2008 10:50 PM

It is not pin compatible, so you definitely wouldn't be able to simply remove one and solder in the other.

maxpou 16th February 2008 01:11 PM

Hi,
yes i know that i gonna design the PCB, but i would like to know for bit clock input, audio data input, system clock and for the selection of audio data if is compatible. thank you! Maxpou

gfiandy 17th February 2008 01:31 AM

Compairing the two data sheets I don't think it will work. The reason is that the Samsung DAC uses two word clocks; one for left and one for right and they are not present for a complete cycle of the data. I have never seen this before.

The Ti part uses the industry standard method of having one word clock with left indicated by one state of the line and right by the other.

If you are good at logic circuits it may be possible to create a circuit to convert the two word clocks into one that is compatible with the TI chip.

Regards,
Andrew

maxpou 17th February 2008 01:46 PM

Thank you for reply!
but where are you found this information? I read the datasheet many time and i dont found it. Maxpou

gfiandy 20th February 2008 06:41 PM

For the samsung part the timing diagrams show the two left right word control clocks WDCLK1 and WDCLCK2 clocks on page 508 in both timming diagram 1 and timming diagram two.

For the BB part the timming diagrams are on page 15 and show just one combined LRCK for left and right word control.

Regards,
Andrew

rfbrw 20th February 2008 08:22 PM

All the signals bar BIT CK, LRCK and DATA are irrelevant to the PCM1754. All you need to find or generate is a system clock signal synchronous to the data.

maxpou 20th February 2008 09:52 PM

2 Attachment(s)
Thank you guys for reply,
but you need a other document sorry! In my cd player the dac use only WDCLK1 as in this schematic.

rfbrw: can you explain more because i don't understand?
thnak you! maxpou

maxpou 20th February 2008 10:22 PM

2 Attachment(s)
and the DSP

error401 20th February 2008 11:02 PM

Quote:

Originally posted by maxpou
Thank you guys for reply,
but you need a other document sorry! In my cd player the dac use only WDCLK1 as in this schematic.

rfbrw: can you explain more because i don't understand?
thnak you! maxpou

There are two WDCLK modes for this DAC. See the timing diagram headings, the modes are selected by MS. When MS is high, WDCLK is just LRCK * 2. You can probably just ignore this though, since it's not needed for the TI DAC.

As rfbrw says, all the signals you need are there (LRCK, BCLK, DIN) except for the system or master clock input. I think you can find that on the SM5807 XTI pin. It should be 16.9344MHz, which is suitable for PCM1754. PCM1754 can run at 5V, so level shifting is not required. I think this should work without much trouble, but obviously you need a whole new output stage.


All times are GMT. The time now is 11:41 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2