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nFORCE 20th March 2003 06:11 PM

IIS data seperator
 
Dear all,

Who know how to make it.

Just like Analog Device AD1852 Page 15.

Many Thanks

Regards,
nFORCE

guido 20th March 2003 10:49 PM

Hi,

Did some fideling on the i2s signals. But i don't have the info on the ad at hand. What do you need to achieve?

Guido

nFORCE 21st March 2003 04:50 AM

IIS seperator
 
Dear,

I want to use 2 DAC instead of ONE to make Differential mode.

Regards,
nFORCE

stokessd 21st March 2003 05:14 AM

You can invert the data line and split off the clock lines and run a pair of DAC chips, one for each of the data lines driven off the came clock lines.

BTW, an XOR chip makes a dandy digital domain absolute phase inversion.

Sheldon

rfbrw 21st March 2003 05:36 AM

That defeats the whole object of the exercise.

guido 21st March 2003 10:17 AM

nFORCE,

Check out the 2*TDA1541 post from a while back (search for guido). It contains schematics on how to split i2s to two i2s signals. One for left dac and the other for right dac. You can then choose if the signal needs to be differential or not. Sounds like it.

Is the AD i2s compatibel. Sounds like an old AD to me..

Greetings,
GuidoB

capslock 21st March 2003 01:09 PM

Guido, just looked at your I2S thread. Nice work!

nforce, have you considered the newer AD1955 part? It has the option to select mono left or right mode by register, unfortunately, you will need a controller to change this register.

After reset, it is in PCM stereo mode, I2S, 24 Bit, 256x fs master clock. As I2S is essentially left-justified, I guess it is ok to feed the DAC a 16 bit signal even if it expects 24 bits. I would assume a single 1955 would be as good as two 1853 in stereo mode.

The PCM1738 also offers the mono option, again only via software.


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