phantom pcm 1732

dillo · 8th July 2005, 11:51 AM

Hello to everybody,
I have a NAD c542 which uses a Burr Brown pcm 1732 dac.
On the Texas Instruments site I could not find any info on this chip.
Does anybody have a data sheet of this *secret* chip, or does anybody know if it has any other name or reference?

Thank you very much.

macboy · 8th July 2005, 12:32 PM

Try google. It's out there.

richt · 8th July 2005, 01:37 PM

hi

pcm1710,1716, & 1732 are almost electrical identical on info datasheet
(schematic).

nad c541 is a beatuifull unit to heavily mod and surpasses much more expensive units!!!

the clock is located on the dac not on the servo! so start replacing the clock with a good one 16.9344megs,eliminate the 2 transistor output mutes near the rca outs (that prevents thumps when powering & off) it can be replaced with an relay.

these 2 small tweaks will perform a way lot better than you can imagine.

later start changing caps.

good luck!

richt

Franz G · 8th July 2005, 06:27 PM

A good source for datasheets:

http://www.alldatasheet.com/

Including PCM1732.

There are several good mods available for the PCM1732 on the net.

One of the easiest is the "Swanson" mod: direct output from the DAC with good coupling caps and a 100R resistor in series to the output.

Disadvantage: lower power level.

Happy ears!
Franz

dillo · 11th July 2005, 05:37 PM

Thank you very much guys!
I found the datasheet, but I still wonder why Texas Instrument hides it. There are a lot of very good machines out there running this chip and they have an outstanding reputation! Furthermore HDCD is to me a very good technology, even if it is not very popular.

I think I am going to bite off those nasty muting transistor and maybe substitute them with relays. Any advice? (please) Are thei useful only when powering up the cd player with the amp on, or they serve also when the cd player enters/exits stanby mode? ( or play/stop?)
Richt, what do you mean that the clock is not on the servo? there is a clock (at least a crystal) on the main board.. It should syncronize both the transport and the dac, or am I wrong?
Sould I do any special to install a better one (e.g. LC XO, etc)?
Would you recommend one in particular?
Franz G, thank you very much, you built some appetite in my curiosity... but I think you've gone too far for my ability and understanding of the matter.
Maybe I will post you in the future, when I'll have more confidence with these issues

Bye and have a very good time!

mpopovics · 12th July 2005, 08:24 AM

24-Bit, 96kHz, Stereo Audio DIGITAL-TO-ANALOG CONVERTER With HDCD Decoder

This is the only DAC from BB, which includes the HDCD decoder.
This is not for commercial market, only OEMs can buy those chips.
There are several licensing rules applies (AFAIK, the HDCD technology and all licenses related to it owned by Microsoft now...).
That is why you can not find in product range and can not buy it.

georgehifi · 13th July 2005, 11:44 AM

I have the PCM1738e in my Musical Fidelity A3.24, but it does'nt have HDCD, it' a 24/96 or 24/192 switchable. Below is 1/2 of the circuit as my scaner can only do A4 and it's A3. I'll do the other 1/2 in another post.

Cheers George

georgehifi · 13th July 2005, 12:07 PM

Input half

georgehifi · 13th July 2005, 12:12 PM

Power Supply

ozone_stink · 14th December 2005, 08:42 PM

Franz, I've Googled PCM1732 & mod and most of them concern the Swanson mod you speak of.

Would you be so kind as to point me in the direction of other mods or give me an abstract of what they are?

Thank you for your help!!

8th July 2005, 11:51 AM	#1
dillo diyAudio Member Join Date: Jun 2005 Location: near Milan	phantom pcm 1732 Hello to everybody, I have a NAD c542 which uses a Burr Brown pcm 1732 dac. On the Texas Instruments site I could not find any info on this chip. Does anybody have a data sheet of this secret chip, or does anybody know if it has any other name or reference? Thank you very much.

12th July 2005, 08:24 AM	#6
mpopovics diyAudio Member Join Date: Apr 2002 Location: Hungary	PCM1732 24-Bit, 96kHz, Stereo Audio DIGITAL-TO-ANALOG CONVERTER With HDCD Decoder This is the only DAC from BB, which includes the HDCD decoder. This is not for commercial market, only OEMs can buy those chips. There are several licensing rules applies (AFAIK, the HDCD technology and all licenses related to it owned by Microsoft now...). That is why you can not find in product range and can not buy it.

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8th July 2005, 12:32 PM	#2
macboy diyAudio Member Join Date: Oct 2003 Location: Ottawa, Canada	Try google. It's out there.

8th July 2005, 01:37 PM	#3
richt diyAudio Member Join Date: Nov 2001 Location: puerto rico	hi pcm1710,1716, & 1732 are almost electrical identical on info datasheet (schematic). nad c541 is a beatuifull unit to heavily mod and surpasses much more expensive units!!! the clock is located on the dac not on the servo! so start replacing the clock with a good one 16.9344megs,eliminate the 2 transistor output mutes near the rca outs (that prevents thumps when powering & off) it can be replaced with an relay. these 2 small tweaks will perform a way lot better than you can imagine. later start changing caps. good luck! richt

8th July 2005, 06:27 PM	#4
Franz G diyAudio Member Join Date: Jun 2004 Location: Bern / Switzerland	A good source for datasheets: http://www.alldatasheet.com/ Including PCM1732. There are several good mods available for the PCM1732 on the net. One of the easiest is the "Swanson" mod: direct output from the DAC with good coupling caps and a 100R resistor in series to the output. Disadvantage: lower power level. Happy ears! Franz

11th July 2005, 05:37 PM	#5
dillo diyAudio Member Join Date: Jun 2005 Location: near Milan	Thank you very much guys! I found the datasheet, but I still wonder why Texas Instrument hides it. There are a lot of very good machines out there running this chip and they have an outstanding reputation! Furthermore HDCD is to me a very good technology, even if it is not very popular. I think I am going to bite off those nasty muting transistor and maybe substitute them with relays. Any advice? (please) Are thei useful only when powering up the cd player with the amp on, or they serve also when the cd player enters/exits stanby mode? ( or play/stop?) Richt, what do you mean that the clock is not on the servo? there is a clock (at least a crystal) on the main board.. It should syncronize both the transport and the dac, or am I wrong? Sould I do any special to install a better one (e.g. LC XO, etc)? Would you recommend one in particular? Franz G, thank you very much, you built some appetite in my curiosity... but I think you've gone too far for my ability and understanding of the matter. Maybe I will post you in the future, when I'll have more confidence with these issues Bye and have a very good time!

14th December 2005, 08:42 PM	#10
ozone_stink diyAudio Member Join Date: Jan 2005 Location: Montreal	Franz, I've Googled PCM1732 & mod and most of them concern the Swanson mod you speak of. Would you be so kind as to point me in the direction of other mods or give me an abstract of what they are? Thank you for your help!!

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