Digital electronics question

[Mrosso]

Can anyone explain how LRCK and SCLK digital clock circuits work in syncing up A/D converters? I think LRCK is wordclock and SCLK is X word clock (n being something like 128 or 256). I'm I close here? How would I hook up an external Word Clock generator to these inputs?

 

[NewYorkDave]

LRCK (left/right clock) is indeed the wordclock. Its frequency is at the audio sample rate.

SCLK is serial clock or bit clock. It's directly proportional to the sample rate, and its minimum frequency is 2Fs * wordlength in bits.

As for how to hook up... what's your ADC?

 

[Mrosso]

Hey thanks, NYDave,

My ADC is a Cirrus Logic CS5381 (I have a CDB5381 eval board I got from Cirrus). The eval board has balanced analog ins and S/PDIF out. According to Jim Williams (audioupgrades.com) he says it's the best chip available right now. The eval board also has a header with pins for LRCK & SCLK. I'm trying to hook it up to my Lucid SSG192 so I can sync it and my MOTU 828mkii. The SSG192 has WC & Super Clock (256x sample rate). I'm hoping I can hook LRCLK to the WC BNC and SCLK to the Superclock BNC. Sound doable? I'm pretty lost.

Thanks,
Mario

 

[Klaus Mogensen]

I'm by no means a maestro on this subject. But as I understand it SCLK and LRCLK are controlled by the receiver chip by connection to ISCLK and ILRCLK respectively (see http://www.beis.de/Elektronik/ADDA2496/AD2496-2_SP.GIF), while the external clock should be connected to MCLK on both the ADC and the receiver chip (j13 connector)

Then program M0 and M1 (for the frequency) and M/S for master slave selection.

BTW, check out this DAC http://www.audiodiylab.com/modules/news/article.php?storyid=6
pretty cheap (sorry not to hijack your thread)