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Old 4th September 2003, 06:11 PM   #1
Raj1 is offline Raj1  United Kingdom
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Location: UK
Default Legato link dac chip,It reads data?

Hi,

Does anyone have a pinout diagram for this chip in a pioneer pds 703

The chip reads

Legato Link

Pulseflow

P02029A

9514H

Thanks
Raja
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Old 6th September 2003, 02:35 AM   #2
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Join Date: May 2003
Location: Colorado
Hello -

Pinout for the PD2029A is as follows:

1 - S/P
2 - RZ
3 - XTEST
4 - VDA
5 - RO
6 - XRO
7 - GNDA
8 - GNDA
9 - XLO
10 - LO
11 - VDA
12 - GNDX
13 - X1
14 - X0
15 - VDX
16 - GND
17 - C (H384Fs)
18 - LZ
19 - MCK
20 - LATCH
21 - SHIFT
22 - ATT
23 - NC
24 - XRESET
25 - DATA
26 - BCK
27 - LRCK
28 - VDD

Hope this helps,
Charles Hansen
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Old 6th September 2003, 07:05 AM   #3
Raj1 is offline Raj1  United Kingdom
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Hi Charles,

Thanks
for the help!!!!


So

pin 5 = right channel non inv out?

6= right inv out

9 = left inv out

10 = left non inv out

Perhaps the wrong way round, but I suppose I can resolder to other pins if it sounds wrong, or even swap wires at the transformer instead if it sounds 'wrong'?

Thanks
Raja
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Old 6th September 2003, 01:44 PM   #4
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Location: Colorado
Hello -

It may be hard to use this without more information, but you can try.

It's apparently a voltage output differential DAC. The RO and LO are the + outputs and the XRO and XLO are the - outputs.

When C is tied high, use a 384 Fs crystal at XI and XO. The MCK is unused in the circuit diagram I have (for a Pioneer DV-505 DVD player). TEST is not connected, while S/P is tied low. The whole thing runs off of 5 volts.

The LZ and RZ outputs are used to mute the analog circuits when there is no audio signal. This is a cheesy trick that all the Japanese companies use to get a better S/N ratio on the test bench, but in no way reflects the real world performance. You can ignore these outputs.

But the real problem is programming the thing. There is a 3 wire programming intreface. This is how you tell it the word length and format of the incoming signal, if de-emphasis should be applied, if you want to attenuate the signal, et cetera.

Without having the full data sheet, you'll have to rely on the default settings, whatever they may be. Typically it will be 16 bits right justified MSB first.

But why go through all this headache when you can by a nice DAC chip for $5 or less that will have a data sheet?

Good luck,
Charles Hansen
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Old 6th September 2003, 02:16 PM   #5
Raj1 is offline Raj1  United Kingdom
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Location: UK
Default dac

Hi Charles,

Sorry I should have mentioned that the chip is actually in my pioneer pd-s 703 cdp. I plan to steal the analogue outputs from the chip to the analogue stage at

http://www.ultranalog.com/cdenhancer/cdenhancer2.html

as he has done for his pd-s player.

Perhaps using this version..........

http://www.ultranalog.com/cdenhancer...ancer2_3a5.pdf

Now you have kindly told me the + and - output pins..............


Thanks
Raja
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Old 6th September 2003, 06:08 PM   #6
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Location: Colorado
Hello -

OK, you should be fine adding that analog stage. I was thinking that you were trying to make a DAC from scratch. I think you will experience a *huge* improvement in sound quality.

Good luck,
Charles Hansen
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Old 2nd November 2003, 12:40 PM   #7
Raj1 is offline Raj1  United Kingdom
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Join Date: Jan 2003
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Hi Charles,

The output stage is finished (sounds fantastic) and I'm thinking of installing a better clock than the stock one (should have done it first!!). Looking at the specs pin 13 is clock input and pin 14 output?


Thanks
Raja
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Old 25th April 2007, 11:25 AM   #8
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Does a direct replacement for PD2029a exists ?
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