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Old 1st January 2013, 11:45 AM   #1991
PHEONIX is offline PHEONIX  Australia
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Hello qusp,

Can you explain a little bit about your setup, are you using the AKODAC. what other boards do you use to run this unit synchronously.

Can you operate synchronous mode using spdif source, or is synchronous mode only available on the USB input interface.

Can I ask you about the bass sound of the ESS9018 DAC in the synchronous mode , is it any different to what it sounds like in the asynchronous mode in your opinion .
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Old 1st January 2013, 02:41 PM   #1992
Coris is offline Coris  Norway
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ESS9018 is not working at all at 150Mhz, but is not working either very well at 133Mhz... The conversion and the audio out of it is very good at 133Mhz, but spikes are quite frequent when useful signal is not present. As the chip have something to convert, then is working very well... As such perturbations appear over the usefully signal, I considered as a not safe functioning zone at 133Mhz. The max clock frequency it may be somewhere in the range 130 - 128Mhz. At 125Mhz is working very well.

As I`ve wrote many times about this subject, those presented here are informations which it may be analyzed and detailed further by the DIY community (those who may be interested in this). I think is just unfortunate that someone just deny apriori such informations and declare it as fullish things, mad science or so...
One may not expect that everything will be done or come by/from one member here, who have to come out with everything about: solutions, measurements, theories, explanations, answers to all questions, and so on. Such enterprise is very time consuming and represent lot of work. What is wrong if this huge work is shared between many DIY interested peoples?
So, everybody's contribution will leads more fast to better results, conclusions...
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Old 12th January 2013, 07:01 AM   #1993
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Hi Coris,

I'm planning to try the overclock to 125Mhz. I'm trying to choose a part. Is it important to get a SAW or is phase noise/jitter more important ?

I thought I might try this part because it seems to have slightly lower phase noise than the Epson SAW. What do you think ?

FXO-HC736R-125. - FOX ELECTRONICS - HCMOS OSCILLATOR, 125MHz, SMD | e絡盟 Hong Kong

Cheers

Tom
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Old 12th January 2013, 07:11 AM   #1994
qusp is offline qusp  Australia
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neither is important... phase noise trumps SAW, not sure what is supposed to be important about SAW?
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Old 12th January 2013, 07:13 AM   #1995
qusp is offline qusp  Australia
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Quote:
Originally Posted by PHEONIX View Post
Hello qusp,

Can you explain a little bit about your setup, are you using the AKODAC. what other boards do you use to run this unit synchronously.

Can you operate synchronous mode using spdif source, or is synchronous mode only available on the USB input interface.

Can I ask you about the bass sound of the ESS9018 DAC in the synchronous mode , is it any different to what it sounds like in the asynchronous mode in your opinion .
hey mate, sorry I had a partial reply for this done and forgot then we had power outage, i'll send you a PM, or alternatively you could send me your email.
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Old 13th January 2013, 07:45 AM   #1996
Coris is offline Coris  Norway
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Quote:
Originally Posted by KlipschKid View Post
Hi Coris,

I'm planning to try the overclock to 125Mhz. I'm trying to choose a part. Is it important to get a SAW or is phase noise/jitter more important ?

I thought I might try this part because it seems to have slightly lower phase noise than the Epson SAW. What do you think ?

FXO-HC736R-125. - FOX ELECTRONICS - HCMOS OSCILLATOR, 125MHz, SMD | e絡盟 Hong Kong

Cheers

Tom
Hi Tom

For the first time is not so important to chose an SAW oscillator. My personal opinion is that experimenting is the best way to go forward, to find new ways. Jitter is important of course in this case, so just chose what do you think is the best for your experiments. Then if the results are as you expect, may you try an SAW oscillator to notice the difference (if you will notice that...). SAW oscillators are quite cheap also. You may then try another overclocking frequencies, to learn more about those aspects. I can not say for the moment that 125 Mhz may be the best overclocking frequency. As you maybe have read, Joe got some glitches in the resulting sound using this clock frequency... For me it works just fine this way, but I`ve noticed good results too with lower frequencies than this (but higher than 100Mhz). I just had not something else (SAW) between 100 and 125Mhz... and my (today) conclusion is that it sounds better with SAW even though the parameters of the SAWs are some how lower than another type oscillators. It is quite interesting if one may find out why... It is also interesting to have more comments (confirmations or not) from DIYer who have done something in this direction, rather than from they who only have opinions about...
If you will want at last publish your conclusions/results, it will only be fortunate for all of us...

Last edited by Coris; 13th January 2013 at 07:57 AM.
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Old 13th January 2013, 08:29 AM   #1997
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Hi,

Thanks for the comments. I'll start by using all the same type of oscillator - the Fox Xpresso. It's very cheap and the jitter seems okay. I will try 45.X, 49.X, 100 and 125. This way I might get an idea about frequencies, synch, asynch etc. Then I can move on to different types of xo and lower jitter ones, already having some idea about freq.

I'd be very interested to know if/why a saw might be better - I guess we need a clock expert with detailed knowledge and experience of this IC to make comment.... maybe there are application notes about this somewhere ?

cheers
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Old 15th January 2013, 07:58 AM   #1998
PHEONIX is offline PHEONIX  Australia
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Originally Posted by qusp View Post
hey mate, sorry I had a partial reply for this done and forgot then we had power outage, i'll send you a PM, or alternatively you could send me your email.
Hello qusp

I sent you my email address .
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Old 16th January 2013, 07:46 PM   #1999
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Originally Posted by Bunpei View Post
I suppose the GUI-based filter design software might be "Filter Designer" included in "Sabre32 GUI" software. When you buy ESS ES9018 Evaluation Board, you can obtain the benefit of those programs. Moreover, if you tweak the board and add external I2C extensions, you can connect your own ES9018 chips. The "Filter Designer" seems very powerful and convenient.
I am very interested of using an ESS ES9018 Evaluation Board with the HifiDUINO to control the registers of the ES9018 chip. Standard there is an USB connection (for use with the Sabre GUI). Is there any reading material on how tweak the board (I2C) so I can connect it to the Arduino?
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Old 16th January 2013, 10:46 PM   #2000
glt is offline glt  United States
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Identify the I2C lines (find them in the ESS chip and follow them), cut and tap in the I2C lines from Arduino. Use a 5v to 3.3v converter just in case (although it has been said that 5V signals is OK)
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