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Old 15th February 2008, 05:21 PM   #1
maxpou is offline maxpou  Canada
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Default 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
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Old 15th February 2008, 10:50 PM   #2
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It is not pin compatible, so you definitely wouldn't be able to simply remove one and solder in the other.
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Old 16th February 2008, 01:11 PM   #3
maxpou is offline maxpou  Canada
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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
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Old 17th February 2008, 01:31 AM   #4
gfiandy is offline gfiandy  United Kingdom
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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
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Old 17th February 2008, 01:46 PM   #5
maxpou is offline maxpou  Canada
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Thank you for reply!
but where are you found this information? I read the datasheet many time and i dont found it. Maxpou
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Old 20th February 2008, 06:41 PM   #6
gfiandy is offline gfiandy  United Kingdom
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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.

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Andrew
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Old 20th February 2008, 08:22 PM   #7
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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.
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Old 20th February 2008, 09:52 PM   #8
maxpou is offline maxpou  Canada
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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
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Old 20th February 2008, 10:22 PM   #9
maxpou is offline maxpou  Canada
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and the DSP
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Old 20th February 2008, 11:02 PM   #10
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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.
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