Tentlabs XO Clock

[Begale]

Hello,
I would like to upgrade my Wadia WT 3200 Transport with Tentlabs XO Clock, but i still have a few questions.
The Wadia is comparable to Marantz CD 94/95 and Philips CD 960, but there also some differences.
The Tentlabs installation guide did not answer all questions.

How do I have the SPDIF-signal from the SAA7220 tapped off and how must the digital signal of the filter shut down?
Do I have to remove not only the two capacitors at the original clock, but also the small resistance?
An independent power supply is an advantage for the XO Clock, but where can I connect the PSU so that it is reliably supplied with power?

Btw:
The PSU of Tentlabs cost around 75 euros - the price I find something .... well, a little bit ambitious 🙂!
Does anyone know a slightly cheaper alternative?

Does it really make sense to reclock the SAA7220 SPDIF-signal, even when in DAC-section a CS8212 chip (about 200 ps jitter) is installed?
Maybe the photo is helpful?

I would be glad if you could help me.

Thanks in advance.

Andreas

 

[lcsaszar]

Remove the two capacitors and the resistor. The Tent clock should go to the XIN of the SAA (pin 11). But I think the SPDIF transfer between the transport and DAC will hide any benefit of the clean clock. Perhaps you can gain something by installing a separate 5V supply for the SAA. Or remove the SAA7220B/P altogether and realize the I2S to SPDIF conversion by another chip (CS8406).

 

[merlin el mago]

Is better to change the DAC clock.

 

[lcsaszar]

Is better to change the DAC clock.

I understand there is no xtal clock in a DAC. It recovers the clock from the SPDIF data stream by using a PLL. So there is an inherent added jitter caused by the PLL.