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Re: DIY DAC

Hi,

> I double checked the rockna-line webpage again. The schema
> indicates an AD1802 receiver, but the the product description
> says it uses an AD1892...

Obvious misprint.

> The same with the receiver, schema has PLL1705 while the
> description says PLL1707...

The PLL170X part is a clock divider whcih generates multiple clocks from a single 27MHz crystal, aimed at DVD-Players and usually not terribly low jitter, even though the 50 - 75pS from the PLL170X series is not too bad.

> Anyways, I checked the AD1892 .pdf datasheet, and on -Page 18-
> there is an option of an ASRC Bypass Mode. Hmmm...

Yes, there is, but with one caveat, namely this:

"In bypass without an external PLL, jitter may be as
high as one MCLK."

Now for a 44.1KHz sample rate and MCLK = 512 X 44.1KHz 1MCLK equals 44nS. This means the peak-peak jitter after the AD1892 in ASRC Bypass Mode may be as high as 88000pS, compared to the around 200pS after a CS8412.

Ciao T

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