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CM6642 usb audio interface .... any good?
CM6642 usb audio interface .... any good?
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Old 21st January 2019, 03:59 AM   #1
IVX is offline IVX  Ukraine
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Default CM6642 usb audio interface .... any good?

I think 6642 is a new compact alternative for 6631, even if you need one more SPDIF receiver IC to get finally I2S. Tiny CM6642 QFN-48 5x6mm + WM8804 SSOT-20 + 12MHz Xtall requires about 45% of the PCB area where was implemented 6631 based USB audio interface i.e. CM6631A+Pm39LV512 + 49.152MHz 3.3V low jitter OSC + 45.184MHz 3.3V low jitter OSC + 12MHz Xtall. Furthermore, WM8804 with an average Xtall probably outperforms CM6631A regarding jitter, the BOM cost will be also 20% less. For instance, I migrated from 6641 to 6642+WM8804 and got more than enough PCB area to implement CC2540 BLE controller on the same PCB size(see attached screenshots) and within the same BOM cost!
Drawbacks:
a) well known SPDIF limit 24/192 vs 32/384 for CM6631A, also, CM6642 doesn't support two Fs 88 & 176.
b) this is a quite new and C-Media's IC, hence near to impossible to get any application info. Actually, this is a complex chip with ADC/DAC, SPDIF and headphone amp+chargepump onboard, a brand new chip configured as headfone+mic set without SPDIF.
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File Type: png 2019-01-21_11-53-23.png (203.3 KB, 113 views)
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File Type: pdf CM6642_Datasheet_v0 91.pdf (381.9 KB, 17 views)
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Old 27th January 2019, 03:59 AM   #2
miro1360 is offline miro1360  Europe
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a very interesting idea
where can they be bought?
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Old 27th January 2019, 04:22 AM   #3
IVX is offline IVX  Ukraine
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I've bought 1KU(MOQ 1 pack) in Symmetry because didn't found another way to buy 10 or 20pcs yet.
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Old 29th January 2019, 02:05 AM   #4
IVX is offline IVX  Ukraine
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oooh, I forgot to mention that 6642 doesn't need any driver to work with Windows(and Mac/Linux of course but that's as usual), I consider this fact as pros too. In case of my W7 64, the first time system spends about 1 minute after plugging USB with 6642 to recognize it and show the new audio device. After the recognition, 6642 ready immediately after plugging in USB. Nice, don't need to explain users anything about how to use a USB, just plug it in, that's it
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