2020 choice of USB/audio bridge

[mhelin]

How about VLSI VS1010:
VLSI Solution-VS1010 - Audio Player System-on-a-Chip

 

[IVX]

hm, not sure about it. As I see, it is up to 24/192(isn't sexy for 2020), the player is a redundant function to me and eat extra power, for sure increasing the cost. Maybe I'm wrong, need to take a look closer.

 

[jfetter]

It does not support flac.

 

[IVX]

Yesterday I tried CT7601SR, the cheapest version of Comtrue, just $2.5. It should support only up to 32/192 and DSD64 but actually, with CT7601CR(32/384 DSD256 $4.5) FW it plays 32/384 no problem at all with Foobar2000, however, with Android it automatically recognized as <=192k interface. Interesting, looks like artificially limited data rate. Current consumption is exactly the same for CT7601SR and CT7601CR.

 

[phofman]

Does the CT7601 use standard USB audio class 2 protocol, or something proprietary with their drivers only?

 

[IVX]

check this out ComTrue Inc. - CT7601

 

[phofman]

Thanks, I went through those docs and did not find any mention of the USB audio usb standard. Therefore I assume it has a proprietary protocol. If that is the case - should ComTrue abandon future versions of supported OSes...

 

[IVX]

Windows need the driver to play 384 and DSD, Android, iOS, Mac don't need.

 

[phofman]

Well if no driver is needed then the protocol is USB-audio class 2. That would be great news as the chip would be future-proof and work in any OS on the market out of the box (android = linux).

 

[meowchin]

What do you need more than 24/48 for? Just to show off in the specs? That's dumb.

 

[nrp]

Have you looked into Nuvoton's NUC505 series? It's not clear how fast you can drive the I2S, but it does support USB FS and is fairly inexpensive. NUC505 Series - Nuvoton

 

[nrp]

Have you looked into Nuvoton's NUC505 series? It's not clear how fast you can drive the I2S, but it does support USB FS and is fairly inexpensive. NUC505 Series - Nuvoton

USB-HS rather.

 

[IVX]

I just tried to google for "nuvoton nuc505 UAC2" but nothing..

 

[nrp]

I just tried to google for "nuvoton nuc505 UAC2" but nothing..

Yes, unfortunately like the other microcontroller based solutions, it would require writing a UAC2 stack on top of whatever USB-HS code Nuvoton supplies.

 

[IVX]

I think, if Nuvoton wants to sell NUC505 more, they need to write that more than I need or you. Otherwise, I would like to choose rather ST or Freescale-NXP for the better, actually, a lot better support.

 

[JarekC]

NUC505 don't have pin for external reference clock for I2S, so you have to use APLL.
In the data sheet no information about jitter.
As for me, it is disqualified

 

[nrp]

Good point. The STM32F730 series has everything needed including USB-HS and I2S with an external clock, but it comes in >$4.

 

[cac liu]

Mainland-chinese agents, FAE, "engineers" etc in most cases very low educated accidentally hired farmers. The only chance to get something is direct realtek contact but they NEVER reply.
PS: realtek could delete ADC/DAC area from that chip to reduce QFN case to 24pins i.e. 3x3mm! And less price such USB bridge may beat all future products from big monsters like Ti, ST, On etc.

Hi, Nice to meet you! I live in Shenzhen for more than 10 years, do you live in See World?

I am an Audio Engineer, work with these solutions for a long time, I agree with you, the FAE of TAIWAN chip companies are dumb, I use lots of XMOS, CMEDIA, SAVITCH, TI...

I work for SHANLING for a long time, Now I work for SMSL, maybe we can do some co-operations.

 

[IVX]

Hi, not only Taiwanese companies FAE so low educated, I had communicated with IR, NXP, TDK(actually much more but with these 3 I had some long term argue) FAEs as well, are the same shamefully ignorant staff. Decent engineers in China making money, they are super rare and have no time for FAEing.

 

[JarekC]

Good point. The STM32F730 series has everything needed including USB-HS and I2S with an external clock, but it comes in >$4.

Build-in USB HS PHY is available only in TQFP144 and UFBGA176 packages.