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Old 28th October 2012, 10:16 PM   #51
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OSCILLATOR
---------------------------

Actually I am using a 49.xx MHz oscillator and in the future will test 100MHz

I have read this about 125 MHz

ackoDAC based on ES9018

XG-1000CA 125.00MHZ 50PPM CB - EPSON TOYOCOM - OSC., SEGA, 125,00MHZ, 50PPM, | Farnell Italia

Oscillatori XO SMD 3.3V 125.00MHz 5x7mm EPSON TOYOCOM XG-1000CA 125.00MHz 50ppm CB consegna in 24 ore

RS will have this component in december.
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Old 29th October 2012, 08:02 AM   #52
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I do not think it is a wise idea to use this clock, in his reply Joe did not even seem to have considered the possibility that it may brown out the dac chip when we mentioned it, this is far above the recommended max speed clock for ESS.

are you running sync mode with the 49MHz clock currently? if not thus is definitely suboptimal for the PLL, for async you should use a non-audio multiple
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Old 29th October 2012, 08:32 AM   #53
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Actually I still need to start to program the firmware to set the internal register of the ES9018 so until now I am using the default hw mode.

Now I have the first good result as sound so this week I will start to develop the controller with a PIC.

Where you have got a good 100MHz low ppm oscillator ?
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Old 29th October 2012, 12:27 PM   #54
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just use the Crystek cchd950, unfortunately they dont make the newer cchd957 in the 80 and 100MHz for small orders, but you can get the cchd950 at mouser as well as the cchd575
both are excellent low phase noise clocks. the 950 is available in 50 and 25ppm grades, while the newer 575 only in 50ppm, but comes in a smaller package and is a bit cheaper. only like 2db difference in close in phase noise the 25/50ppm rating is over 0-+75c as far as aging its 3pp for the first year and 1ppm thereafter. so actually looking at the new 575, may not be a bad choice at all, might even choose it over 950
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Old 29th October 2012, 02:07 PM   #55
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Hi all.this is the pcb source HQ Andrea shunt, because I and andrea designed.
noise is very small, can be said to be very small. I and he had lost a lot of time researching and testing! Results for great sound.
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File Type: jpg hq-Andrea shunt test.jpg (175.5 KB, 774 views)
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Old 29th October 2012, 02:26 PM   #56
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hi!
all i test the out put Dac-end R wit LL1684 the good for the sound, better than ll1674, if you not like the out out op am and tube.

see the data of it!

LL1684 - Lundahl Transformers
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Old 29th October 2012, 06:26 PM   #57
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Here the new version of the op-amp configuration OPA627 + OPA2134.

On any ES9018 output I have used as I/V a set of 2 x 20ohm 1% resistance in parallel to have 10ohm.

Now also on headphone the noise is zero and no oscillation also without 33pF compensation.

This output stage is used in Mark Levinson no. 380 and it is published on OPA627 datasheet like a High Speed Instrumentation Amplifier.

The 100 ohm resistances can be connected to ground or not like the datasheet schematic, I prefer lock to ground (test the sound).
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File Type: gif OpAmp_ver4a.gif (20.5 KB, 732 views)
File Type: jpg OpAmp_OPA627_OPA2134_ver4a.JPG (197.0 KB, 730 views)
File Type: gif OP627_sch.gif (14.3 KB, 717 views)
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Old 30th October 2012, 08:47 AM   #58
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I test the shunt supply PCB for DAC, it run wll!
thanks
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File Type: jpg shunt.jpg (108.9 KB, 704 views)
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Old 31st October 2012, 03:58 PM   #59
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Yesterday evening I have compared the XMOS module by Lorien used only as USB-SPDIF

XMOS-based Asynchronous USB to I2S interface

with Tenor 7022 USB-SPDIF 96 KHz 24 bit got on Ebay shop.

The XMOS is much better also using spdif and it is impossible ear the music with Tenor.

I thought I found a minor difference because the ES9018 resamples the signal so it should be less affected by a less precise signal input.
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Old 1st November 2012, 01:00 AM   #60
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I just completed the design layout DAC-END R, you are interested please pm me!
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