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In Reply to: There is a difference between the CM6631 and CM6631A posted by fmak on December 26, 2013 at 05:16:30:
"Just to elaborate, the unit under discussion has XOs of 45xxxMHz and 49xxxMHz, presumably stepping down via the CM chip to get the correct playback sampling frequencies. This is not a good thing either."
Presumably the clock speeds would be 1024 x 44100 and 1024 x 48000 Hz. When run with the optional external clock the on-board oscillator and PLL would be bypassed, and there would just be a divider that counted down the I2S and SPDIF bit clock. I'm not sure why you think this mode of operation would be bad. I would think this would be the only way to get low jitter operation out of a USB DAC, namely using an I2S interconnect with the clocked sourced at the DAC itself and isolated from the converter chip.
(Of course, getting the switchover to work properly and disabling the unused clock would probably be a bitch. Perhaps some DIY person has tried this. If I were building a device based on this chip I would budget time to sort out these issues.) At least the price is right, under $10.00 and if used in the right system architecture nothing on the chip should have any effect on sound quality. (Assumes I2S with isolated interface from DAC proper data going to DAC chip and clock going from DAC chip to converter chip.)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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- RE: There is a difference between the CM6631 and CM6631A - Tony Lauck 11:07:10 12/26/13 (0)
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