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-   -   TAS1020B-based Asynchronous USB to I2S/SPDIF converter 24bit/96kHz (http://www.diyaudio.com/forums/digital-source/206626-tas1020b-based-asynchronous-usb-i2s-spdif-converter-24bit-96khz.html)

JarekC 13th February 2012 11:44 AM

TAS1020B-based Asynchronous USB to I2S/SPDIF converter 24bit/96kHz
 
3 Attachment(s)
Hi,

I would like to present my new project "USB to I2S/SPDIF asynchronous mode conveter 24bit/96kHz based on TAS1020B"
I started this project about a year ago. It is now close to completion.
Most problems were with the proper implementation of the asynchronous algorithm,
in some cases TAS1020B documentation is incomplete and there are no examples.
PCB is prepared for all options except galvanic isolation
The project was developed on the Polish forum, dedicated to DIY audio.
The first test PCBs are ready and tested by users.
Convertes was tested on Windows and Linux, MAC OS will be tested this week.


The project was divided into several stages:
Stage 1: (READY)
- USB to I2S converter (fsample 44.1kHz,48kHz,88.2kHz,96kHz 24bit)
- Master Clock = 256Fs
- powered from USB or external power supply
- Master clock generated by TAS1020B from 6.000000MHz crystal
- 3 LEDs for indication an operating mode

Stage 2: (READY)
- USB to SPDIF converter (fsample 44.1kHz,48kHz,88.2kHz,96kHz 24bit)
- Wolfson WM8804 SPDIF transmitter
- Outputs: COAX, OPTO, AES/EBU (optional)
- Master Clock = 256Fs
- powered from USB or external power supply
- Master clock generated by TAS1020B from 6.000000MHz crystal
- 3 LEDs for indication an operating mode

Stage 3: (IN PROGRESS)
- USB to I2S/SPDIF converter
- two external master clocks 22.5792 Mhz (for 44.1Khz and 88.2kHz) and 24.576MHz (for 48Khz and 96 Khz)

Stage 4: (PLANNED)
- galvanic isolation for USB Bus (ADUM4160)

Bellow schematic and photos of first board (I2S and SPDIF versions).

Best regards
JarekC


PS.
Sorry for may bad english.

i2k92 13th February 2012 12:09 PM

Any plan to sell a kit ?

PS your english is perfect.

JarekC 14th February 2012 03:35 PM

Hi,

Yes it is possible.
I have a few PCBs and components, but I never not send parcels outside the EU.

At this moment about 10 pcs are tested by Polish DIY forum members.
First impressions are positive.

Best regards
JarekC

JarekC 16th February 2012 10:09 AM

1 Attachment(s)
Hi,

Another foto and I2S connector scheme.

At this moment I'm testing version with external genarators (22.5792MHz and 24.5760Mhz). I have sample of Fox Electronics FXO-HC738.

Best regards
JarekC

barmanekm 17th February 2012 09:17 AM

Hi,

I had a chance to test this device, as I am also member of mentioned polish DIY forum.
What I might say is that a really smart, simple and wonderful sounding solution.

I had only opportunity to compare with synchronous devices (inlcuding PCM270x solutions). Actually there is nothing to compare - it is simply much better.

Sound is cleaner, there is a dark background but the biggest difference is in the sound stage presentation. Especially on high resolution files which do not need to be re-sampled in software domain. I was not testing it against another hi-res devices but I have ordered one, and maybe will do such comparison soon (TENOR, E-MU 0204).

JarekC 20th February 2012 05:25 PM

1 Attachment(s)
Hi,

I designed an additional PCB layout with galvanic isolation (ADUM4160/3160).
The PCB is mounted instead of USB connector.
On the new PCB there is new USB mini connector.
TAS1020B controls the signal PIN of ADUM4160.
ADUM can be powered from 3.3V or from external power supply.

Bellow schematic.

Best regards
JarekC

tcpoint 21st February 2012 05:05 AM

Do you on posting the source code? I'd be interested in looking at it.

JarekC 21st February 2012 09:48 PM

Hi,
The project was created for DIY (building DAC or extend the functionality of DAC).
At this moment PCB and kits are available on Polish DIY forum.
Published scheme allows independent modification of converter.
However, the source code is coryright and and will not be published.

Best regards
JarekC

kp93300 23rd February 2012 01:38 AM

Hi JarekC
Any info on selling price and postage of the usb to i2s module ?
thanks
kp93300

JarekC 23rd February 2012 08:53 PM

Hi

USB to I2S module (STAGE1 specification, assembled & testet)
cost about 40$ + shipping

USB to SPDIF(COAX) module (STAGE2 specification, assembled & testet)
cost about 60$ + shipping

I never not send parcels outside the EU, so I don't know shipping cost.
I have to check this.

Version with externals oscillator is not available now because of problems with purchase of 22.5792MHZ oscillators in a small amount.
Mouser and Digikey stocks are empty.

If anyone knows a supplier for 22.5792MHz oscillators (SMD 7mmx5mm, 3.3V, 20-25ppm) in good price, I will be grateful for information

Best regards
JarekC


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