So if you look into the difference between the different format, the only difference is the timing of the data signal during the LRclock cycle. For 16 bit, if you delay the LRCLK signal of a Sony ( aka EIAJ ) signal by 7 BCK cycles, and invert it as well, you will fool the DAC into thinking it is a I2S signal. This can be done easily with a simple shift register.
To convert from I2S to Sony ( aka EIAJ ), the delay the Data of the I2S by 7 BCK cycles, and invert the LRCLK. This will foll the DAC to think that the signal is EIAJ rather than I2S.
My implementation of the shift register for a EIAJ to I2S is as attached:
To convert from I2S to Sony ( aka EIAJ ), the delay the Data of the I2S by 7 BCK cycles, and invert the LRCLK. This will foll the DAC to think that the signal is EIAJ rather than I2S.
My implementation of the shift register for a EIAJ to I2S is as attached:
Attachments
Sorry, but I can't read it . . .
If you have a clearer scheme, attach it as PNG or GIF preferably, since it's not a photograph
If you have a clearer scheme, attach it as PNG or GIF preferably, since it's not a photograph
found my original post. Schematic, PCB and circuit description somewhere along the thread.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=25177&perpage=10&highlight=&pagenumber=4
http://www.diyaudio.com/forums/showthread.php?s=&threadid=25177&perpage=10&highlight=&pagenumber=4
I guess I'll get the datasheet of the ICs used to know their pins, the PCB overlay don't help that much.
Also, I'll not be using the D/F output, but the 2500AQ one. The D/F separates LDATA & RDATA.
Also, I'll not be using the D/F output, but the 2500AQ one. The D/F separates LDATA & RDATA.
good luck then.
I use my CXD1135 EIAJ output, converted to I2S, to drive a 2x tda1541A DAC. Works like a charm and saved me a really hard to get cs8412.
I use my CXD1135 EIAJ output, converted to I2S, to drive a 2x tda1541A DAC. Works like a charm and saved me a really hard to get cs8412.
But do I need to buy specifically the marked 74??? , Mouser don't carry them as I see(Yes, but with other letters).
Why don't you use a scoket and try various types. Some people can tell the diference between different types but I cannot. To me logic is logic. I used 74F04 and 74HC04 with no problem. Actaully, I think any high speed 74xx04 will work. Similarly for the 74374. The max freq is only 2.12MHz which is easily handled by any TTL circuit.
CM
CM
Oh, it's just that the scheme has looong name for these ICs.
Hey, I didn't receive a notification for this post!
Hey, I didn't receive a notification for this post!
TDA1541A: I2S and EAIJ?
I don't quite see why it's needed to convert the I2S signal into EIAJ because the TDA1541A can be operated in both modes, right? Ok, so the spec sheet doesn't really say that the "EIAJ" mode corresponds to the "MUX OB" mode. Can anyone tell me if the "MUX OB" mode is the Sony format? The thing is that I have a Sony cd-player which I'd like to modify.
I don't quite see why it's needed to convert the I2S signal into EIAJ because the TDA1541A can be operated in both modes, right? Ok, so the spec sheet doesn't really say that the "EIAJ" mode corresponds to the "MUX OB" mode. Can anyone tell me if the "MUX OB" mode is the Sony format? The thing is that I have a Sony cd-player which I'd like to modify.
TDA1541 uses Philips I2S format. Sony uses Sony format. You will only get a loud noise or silence when you use the TDA1541 with Sony format.
Here are two different 300dpi PNGs containing single sided PCBs for cm's EIAJ to I2S converter. The first is bigger and requires tons of jumpers and the second is smaller, has bigger traces, but the jumpers need to be wires instead of resistor leads(longer). These are my two first PCBs, done using ExpressPCB and a slightly modified version of FreePDF to print PNGs instead(More programs can be used to remove the grid). I removed the ExpressPCB grid in the second version only.
Here
http://www.diyaudio.com/forums/showthread.php?postid=297035#post297035
for the scheme
http://www.diyaudio.com/forums/showthread.php?postid=699972#post699972
for the sch and pcb files for ExpressPCB. V2 uses the same scheme, but the PCB file for v2 is not in the post I linked.
http://www.diyaudio.com/forums/showthread.php?postid=297035#post297035
for the scheme
http://www.diyaudio.com/forums/showthread.php?postid=699972#post699972
for the sch and pcb files for ExpressPCB. V2 uses the same scheme, but the PCB file for v2 is not in the post I linked.
Hello
Just one questen:
Where do I connect pin 2 from U2A inverter in the attached schematic??
Setup Onkyo cdplayer:
CXD2500->EIAJ to i2S converter-> PCM1798-> external clock 16.9344Mhz
Best regards
Kim
Just one questen:
Where do I connect pin 2 from U2A inverter in the attached schematic??
Setup Onkyo cdplayer:
CXD2500->EIAJ to i2S converter-> PCM1798-> external clock 16.9344Mhz
Best regards
Kim
just as a shoot in, without opening a new thread on the subject:
The I2S is a databus that contains the clock and data?
I2S is a not a standard, its a "name" for differnt kinds of data busses?
just wondering really..
afraid to ask, afraid to learn you know..
thanks
Marius
The I2S is a databus that contains the clock and data?
I2S is a not a standard, its a "name" for differnt kinds of data busses?
just wondering really..
afraid to ask, afraid to learn you know..
thanks
Marius
kimschips said:
What is to be gained by this conversion? The CXD2500 will connnect to the PCM1798 without it.
Hello
As CXD2500 spit out EIAJ format-> PCM1798 can only accept I2S, Leftjustified or standard 16 or 24 bit format.
What if using DF1704 instead off EIAJ to I2S converter
Am I being confused here?
Kim
PS: PCM1798 datasheet http://focus.ti.com/lit/ds/symlink/pcm1798.pdf
As CXD2500 spit out EIAJ format-> PCM1798 can only accept I2S, Leftjustified or standard 16 or 24 bit format.
What if using DF1704 instead off EIAJ to I2S converter
Am I being confused here?
Kim
PS: PCM1798 datasheet http://focus.ti.com/lit/ds/symlink/pcm1798.pdf
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