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#1 |
diyAudio Member
Join Date: Sep 2009
Location: Sofia
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Hi Everyone,
For quite some time now I’ve been working on asynchronous USB audio signals. I would like to introduce you the final version. The XMOS firmware is changed so it can play 32-bits PCM audio and to play DSD audio. Features: 1. XMOS 500MIPS 64-pin chip for transmission of asynchronous USB audio data to I2S line. 2. Sampling frequencies: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz, 352.8kHz, 384kHz 3. Resolution: 16-, 24- and 32-bits. 4. I2S or right-justified data (external pin configuration) in 32-bit frame. 5. Two low jitter oscillators for audio 45.158MHz and 49.152MHz. 6. Input for external master clock. 7. LP5900 ultra low noise linear power regulator (6.5 uV RMS). 8. No switch mode power supplies in the PCB board. 9. Galvanic isolation (outputs, two oscillators and reclock are after the isolator). 10. Galvanic isolated output with open collector for DAC configuration in DSD mode. 11. Automatic detection of data type (PCM or DSD). 12. Master clock outputs: 45.1584/49.1520MHz and 22.5792/24.5760MHz (I2S 22.5792/24.5760MHz are reclocked by edge from 45.1584/49.1520MHz) 13. Three different ways to power the board, possible configurations: 13.1 Power by USB bus. 13.2 The USB part is powered by USB bus, but the generators and the reclock are fed by a separate external power supply. 13.3 Both the USB part and the generators with the reclock are fed by two different external power supplies. (The selection of a configuration is done by jumpers) DSD Audio over PCM frames DSD64(2.822400MHz) and DSD128(5.644800MHz) by method DoP with 0x05/0xFA markers. In DSD mode outputs are DATA Ldsd -> DATAi2s, DATARdsd -> LRCKi2s, BitClockDSD -> BitClockI2S. SPDIF output (through DA101C transformer) – 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz (16-24 bits). Additionally, I developed a DAC PCM5102 PCB to the XMOS PCB for monitoring purposes. This PCB is made for indicating sampling frequencies. DAC PCM5102 accepts 16-, 24-, and 32-bit audio PCM data, but it can not play DSD signal. Kind regards |
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#2 |
diyAudio Member
Join Date: Feb 2013
Location: Beyond Infinity
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It is two channel or multi-channel ?
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#3 |
diyAudio Member
Join Date: Sep 2009
Location: Sofia
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I'm using single-core XMOS processor, for multi-channel audio one has to use dual-core XMOS processor. I plan to design such PCB, but it won't be 77E, such as this two-channel audio PCB.
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#4 |
Account disabled at member's request
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Availability? Price?
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#5 |
diyAudio Member
Join Date: Dec 2008
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very nice and neat design, I like especially how small and compact it is together with the PCM5102 DAC board;
do you plan a group buy for these? I would be very interested at least in the PCM5102 board. how have you configured the PCM's digital interpolation filter, is it FIR normal or IIR low latency ? thanks
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== There are no limitations to the self except those you believe in == |
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#6 | |
diyAudio Member
Join Date: Sep 2009
Location: Sofia
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Hi,
I expect PCBs on monday (27.05). XMOS board costs 77 Euro. Both XMOS and PCM5102 boards cost 99.9 Euro. These prices are without shipping. Shipping costs depends on destination so it's not a fix price. Quote:
The default state is FIR filter, but there is an input port for configuration so one can choose between FIR / IIR filters. regards, Joro |
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#7 |
diyAudio Member
Join Date: Dec 2008
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thanks for the updates on the prices,
maybe you could organize a group-buy in the "vendor's bazaar" part of the forum where everyone interested could sign up; what are the quantity limits for each board so that they could benefit a price drop and how much would be that price? where are you located if I may ask, EU or USA? (it's for an estimative calculation of shipping charges for my location) edit - what is that little board in the upper right corner of your pictures ? - is the reclocker/isolator part already mounted on the USB-I2S main pcb or it has to do something with that little board? hehe, now I realize that is the other side of the PCM5102 pcb ![]() best regards
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== There are no limitations to the self except those you believe in == Last edited by luxury54; 22nd May 2013 at 09:44 AM. |
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#8 | |
diyAudio Member
Join Date: Sep 2009
Location: Sofia
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Hi,
I update my profile. Quote:
Regards, Joro |
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#9 | |
diyAudio Member
Join Date: Dec 2007
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Quote:
ii) what external power supply do you recommend for each of these power inputs? Just a basic 3pin pre-regulator, or is something high-end called for? |
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#10 |
diyAudio Member
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Waiting for GB.
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