FDA-1 PCM1794A DAC Kit Revision 6 Manual
January 14, 2012 - filed under: DAC
Note that a new revision manual is released today. The new revision added two attachment 6 & 7 total 5 pages at the end of the manual. Attachment 6 is the Balance mode external I2S connection and attachment 7 is the rear panel dimensions.
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Last update on Jan 26, 2012:
Note that the 50% OFF sales is still on-going. No re-issue due to shortage of Toshiba parts like 2SC2240, 2SA970, 2SC1815, & 2SK30A. The power transistors 2SC3421 and 2SA1380 have be replaced by another matched pair already. Also 0.047u will be replaced by 0.056u same panasonic ECQ-V film capacitor. For Dale, some of them may be replaced by Vishay MRS25 resistors depending on stock level. Note that MRS25 is 50ppm part while dale is 100ppm part.
28 pieces PCB to go!
Note that Single Ended kit uses one pcb and Full Balance kit uses two pcbs.
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XMOS USB Audio 2.0 Reference Design Jitter Measurement
January 9, 2012 - filed under: DAC,Sources
The XMOS demo board sold for $149 in digikey. The firmware need to be loaded before the board can be used. There is a digital out from the USB 2.0 demo board and thus it will be a easy interface from USB to FDA-1 optical input. What you need to do is to get an optical cable to link up output of demo board and input of FDA-1 Toslink. I have tested this mode and the sound is better than using Ti PCM2707 USB receiver with I2S output.
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On board, there is a I2S connector and thus the clock jitter measurement is taken at the MCLK, BCLK, LRCLK locations. The jitter at MCLK from 48k to 192k Fs is from 10 to 13 pico second respectively which are excellent. In fact the MCLK is taken directly from the onboard crystal oscillator after the buffer logic IC. For jitter at other clock like BCLK (Bit Clock) and LRCLK (Word Clock, Fs), they are as high as 800 pS or above. For any DAC using the MCLK as the clocking reference (like FDA-1), the result should be very good.
Attached is the document of jitter measurement for reference:
Jitter measurement by Lecroy DDA-120
From all the measurement, the lowest jitter mode is to set the output of the USB 2.0 at 24 bit with 48k Fs.
With a more accurate period jitter machine Wavecrest DTS-2070C, the jitter at MCLK is measured at only 4.6ps. See attached document:
Jitter measurement by Wavecrest DTS-2070C
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FDA-1 PCM1794A DAC Clearance Sales – 50% off!
July 21, 2011 - filed under: DAC
* * * 50% OFF * * *
FDA-1 PCM1794A DAC clearance Sales and while stock last!
NEW prices in the STORE page.
I have updated a new user manual as below: