Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: FANTASTIC, Tweak of the Year!

195.85.130.25

Posted by Elso Kwak on March 15, 2001 at 05:18:01

In Reply to: Re: FANTASTIC, Tweak of the Year! posted by wildmonkeysects on March 14, 2001 at 15:04:44:

Hi Wildmonkeysects,
Thanks for the reply. Yes Crystal has even a application note (#159) about the loop filter optimization for the CS8415A, 8429 and 8427 but not for the CS8412!

As regards the "stand alone" operation of the CS8412: What I was hoping for was NOT to extract the bitclock SCK and FSYNC from the datastream. But I am afraid only the CS8411 is suitable for that kind of operation. {If I understand the datasheet correctly. Apparently these Crystal dataheets are written by a individual coming from Mars or other strange planet} I don't like the idea of reclocking the incoming DATA; I feel this is wishful thinking. All in one the CS8412 seems to be predestined of working on a SPDIF or AES/EBU datastream.

You raise a interesting point in addressing the low frequency rollof of the interface... Well I have done some experiments here by driving directly the 75 Ohm cable. The data come from the Sony CXD2500Q pin 60 ; than go through one inverter of 74HC04U and splits into two other inverters; one of them driving the Toslink output the other driving the base of a 2N2369A transistor. The transistor's collector connected to +5V, the emittor coupled with a 75 Ohm emittor resistor to the core of the coax cable(75 Ohm). When the cable is connected to the DAC where it is terminated with 75 Ohm to ground the transistor starts working. [Idea borrowed from Horowitz, the Art of Electr. and Analog Devices] The data signal looks very nice on the scope using a HF probe. ["Normal" probes are useless with these high frequencies. The HF probe is nothing more or less than a piece double terminated coax cable] In spite of this effort I hear no difference between coax input and Toslink input and that is cursing and swearing in the church...or shall I say heresy on these pages?
In Germany is a guy Stefan Craemer who has a complete and expensive interface system. He holds even a patent on it. See the link. My scheme looks ridiculously simple compared to that.
Looking forward to your next post.
Cordially,
ELSO

• http://www.stefan-craemer.de/caa

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