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Help for PCM1704 Delay Circuits and Other
Help for PCM1704 Delay Circuits and Other
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Old 17th May 2020, 01:21 AM   #1
Alchamist is offline Alchamist
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Default Help for PCM1704 Delay Circuits and Other

I try to make a NOS balanced dac with 4xPCM1704 and JLSound I2SOver module.Before to draw layout and PCB boards i need help and some advice from members if it possible.My circuit like that block diagram.My questions are ;
  1. Do i have to add a delay data half clock cycle circuit after my buffer and 7 bit delay like DDDAC ? It confused me.
  2. Do i need to use a SRC4192 after WM8804? Or my diagram is enough to get coax and optical inputs?
  3. According to members experience, NOS or DF1706 Oversampling.Which one should I prefer?
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Last edited by Alchamist; 17th May 2020 at 01:34 AM.
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Old 19th May 2020, 03:43 PM   #2
Zoran is offline Zoran  Serbia
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Quote:
Originally Posted by Alchamist View Post
PCM1704 and JLSound I2SOver module.
I think that You do not need to use any additional circuit. Because right justified format already is present via jumper configuration? Take a look at the JL datasheet...
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Old 19th May 2020, 09:41 PM   #3
Alchamist is offline Alchamist
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Quote:
Originally Posted by Zoran View Post
I think that You do not need to use any additional circuit. Because right justified format already is present via jumper configuration? Take a look at the JL datasheet...
Actually my questions for after S/PDIF and optical input stage. After these stages Wm8804 comes. Then bit delay and buffer stages then pcm1704 chips. It seems enough or there need to take actions which i ask first post.
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Old 21st May 2020, 02:40 PM   #4
miro1360 is offline miro1360  Europe
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JLSound is capable to drive the PCM1704 directly
SRC4192 is digital filter
if you want to keep the NOS, use a shifter, it can be either a 7 bit delay or the whole army which will store 32 bits + 7 bit and latch it together ...
DAC with two PCM1704
use registers 74hct164d (smd)
alternatively create a stop-clock system from digital logic, but it is more complicated and in 1704 you will not find a benefit

Last edited by miro1360; 21st May 2020 at 02:42 PM.
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Old 22nd May 2020, 07:27 AM   #5
Alchamist is offline Alchamist
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Quote:
Originally Posted by miro1360 View Post
JLSound is capable to drive the PCM1704 directly
SRC4192 is digital filter
if you want to keep the NOS, use a shifter, it can be either a 7 bit delay or the whole army which will store 32 bits + 7 bit and latch it together ...
DAC with two PCM1704
use registers 74hct164d (smd)
alternatively create a stop-clock system from digital logic, but it is more complicated and in 1704 you will not find a benefit

So there is no need to delay data half clock cycle like DDDAC ?
DDDAC 1794 NOS DAC - Non Oversampling DAC with PCM1794 - no digital filter - modular design DIY DAC for high resolution audio 192/24 192kHz 24bit
Pavel's circuit is enough for the NOS application.
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Old 22nd May 2020, 12:14 PM   #6
miro1360 is offline miro1360  Europe
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I've never tried WM8804, no spdif application in my house all you have to do is try it, left a space on the pcb for experimenting. I would have tried it before on a breadboard pcb.

WM8804 can't drive the PCM1704 directly
jlsound can drive it directly
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Old 22nd May 2020, 01:35 PM   #7
EUVL is offline EUVL  Europe
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Any project with PCM1704



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