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Old 29th June 2003, 08:54 AM   #1
joke is offline joke  Croatia
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Question Diy DAC with AD1955 ???

Hi I 'am total newby ...
But does any body have some shematics how to conect cd transport with I2S to AD1955 ???
Or any chematic of DAC with 1955 ???
I have see some DAC with AD1865 and TDA1543 which use CS8412 , but could not find any thing on AD1955...
On AD web pages I have found only shematic with AD1955 and I/V stage with AD797...

Is diy DAC with AD1955 just too complicated for a newby ???

Any answer will be great help

Thanks
Josip
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Old 30th June 2003, 09:54 AM   #2
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Default AD1955

Hi, Joke,
I'm also interested in a design w. AD1955. In fact, I'm designing something with it. I don't know when I wll be ready, but surely I'll make a schematics and a PCB for this.
However, If you take source IIS from some other hardware /not your DIY/ it's greatly reccomendable that you can obtain low-jitter source for the DAC. Try upgrading the Clock Source first, and if you want, I'll keep you in touch w. my design.
AD 1955 is a good sigma-delta /one of the best/ and is easy to connect to IIS source. It requires, however, external I-V conversion and great care must be taken here. I prefer trying LC-filtering of the HF against using very expencice op-amps like AD797, AD8620 , AD811 etc. My design will use NE5532A or OPA2134.
Regards,
Kaloyan
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Old 30th June 2003, 04:55 PM   #3
joke is offline joke  Croatia
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Thanks for replay Kaloyan

Josip
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Old 2nd July 2003, 05:22 PM   #4
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Default AD1955 DIY DAC

I`m work
current project
SM5847+Ad1955 (external filter settings)+AD8138(I-V stage)+(AD8131+AD9631 diff to single )=LPF
power supply op2177+blue led. BG&OScon,Wima FKP
PCB layout about 80% very hard on 2 layers ,very slow (start december 2002)
from VAU1254 signal input to EPM3064 by Altera.
sorry my bad english
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Old 2nd July 2003, 05:56 PM   #5
joke is offline joke  Croatia
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Thanks people for yours replays

Maybe some one could poste some drowing how to conect CS8414 and AD1955 ?

Thanks

Josip
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Old 2nd July 2003, 07:04 PM   #6
Norbert is offline Norbert  Europe
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Default AD1955 Board for DAC5

Hi,

I'm currntly working on a DIR1703/AD1955 module for my DAC5-project. Just in case you don't know the design: "http://www.diyaudio.de/html/dac5.html".

Regards,

Norbert
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Old 2nd July 2003, 11:59 PM   #7
 is offline  Russian Federation
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Hi, joke
Anything difficult is not present. Download datasheet for CS8414, and look, how will expose a format of an output.
You need I2S format, 24bit.
FSYNC =LRCK, other outputs and so are clear, only four wires.

Regards
halyavshick
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Old 3rd July 2003, 06:09 PM   #8
joke is offline joke  Croatia
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Hi Norbert...I know about yours DAC design and I drop by on yours web page from time to time just to see whats new



I have datashits for CS8414/8413 and AD1955 ...
so what should I connect

CS8414 Ad1955
MCK - MCLK
VERF - ?
SCK - ?
FSYNC - LRCLK

Whell any way thank you folks for your answers but I think I 'am goon' put this on coold and read more about DAC... ...and I have to finish my Aleph-X ...so...

Regards Josip
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Old 3rd July 2003, 08:32 PM   #9
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joke
S8414 -> AD1955

SDATA -> SDATA (pin4 of AD1955) data
SCK -> BCLK (pin3) bitclock for data
FSYNC -> LRCLK (pin2) wordclock for data (left ch/rigth ch.)
MCK ->MCKL (pin28) main system clock

It`s standard for wires of I2S-link.

VERF is pin for indicating errors in audio data signal (see page 20 datasheet). It can be not used.

See also tab3 page 21
You need in

M2 M1 M0

0 1 0 (2-OUT L/R , I2S Compatible)
low high low


AD1955
see page 6 of datasheet for it
PD/RST pin - reset (autoreset by power-on if high)
the SPI pins (24,25, and 26) should be tied to DGND or DVDD. (DGND better)
pin9 DSD_PHASE should be connected low (DGND).


Shematic for CS8414 but AD1853. But circuit difficult, there is used indication of a format of an digital input. DjVu format.

http://www.zeuslab.newmail.ru/images/D24/d24sch.djvu
AD1955 an work with the data up to 48kHz only, if the external microcontroller is not represented.

This shematic from
Zeuslab pages (russian DIY audio laboratory)
There are a lot of different shematics and photos DIY DACs, including devoted 1X oversampling, but text in Russian.

Regards
Halyavshick
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Old 4th July 2003, 02:44 PM   #10
joke is offline joke  Croatia
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Thanks Halyavshick

Josip
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