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Old 17th January 2013, 08:42 PM   #2001
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I did identify the SCL_06 and SDA_07 pinouts for I2C on the chip in the PDF with schematics (pin #21 and #22). However, I am unsure on how to tap in on those lines on the PCB of an ESS ES9018 evaluation board. Is there an example to be found on how to accomplish that?
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Old 17th January 2013, 09:21 PM   #2002
glt is offline glt  United States
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Can you post some photos? and especially if you can identify any jumpers in those lines.
Otherwise you will have to use the destructive way:

Cut the lines with a knife, scrape off the solder mask and solder the wires to those points.
That is an expensive board though...
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Old 17th January 2013, 11:00 PM   #2003
PHEONIX is offline PHEONIX  Australia
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Hello glt,

What Arduino board would I need to get to control a sabre 9018 dac and a fancy graphic display. Sorry for the silly question but is the Arduino UNO all I need.
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Old 17th January 2013, 11:05 PM   #2004
Bunpei is offline Bunpei  Japan
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According to my memory of two years ago, there are no jumpers on the I2C lines.
You need to identify the paths and cut them. Two long lines traverse from USB controller section to DAC section. I cut them at the middle of the straight lines.
The same method "glt" described was applied. In my case a switch on a small sub board was added.
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Old 18th January 2013, 12:45 AM   #2005
glt is offline glt  United States
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Quote:
Originally Posted by PHEONIX View Post
Hello glt,

What Arduino board would I need to get to control a sabre 9018 dac and a fancy graphic display. Sorry for the silly question but is the Arduino UNO all I need.
Unless you are planning on extensively modifying the code I have, don't use the fancy graphics display.

To use the existing version of the code you can use the UNO and a 4x20 LCD text display as specified in the intro page of the blog
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Old 18th January 2013, 03:06 PM   #2006
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Quote:
Originally Posted by Bunpei View Post
According to my memory of two years ago, there are no jumpers on the I2C lines.
You need to identify the paths and cut them. Two long lines traverse from USB controller section to DAC section. I cut them at the middle of the straight lines.
The same method "glt" described was applied. In my case a switch on a small sub board was added.
Unfortunatly that was also my conclusion after examining the board. But as "glt" pointed out it is an expensive board and I don't want to damage it... Maybe I have to go for a Buffalo III-SE board in the long run...
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Old 19th January 2013, 03:36 AM   #2007
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Quote:
Originally Posted by Coris View Post
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.
Hi Coris,

I'm using the 125Mhz Fox Xpresso and the sound quality is very good, but when there are quiet moments in the music, I hear crackle - HF spikes - almost like vinyl records. Has anyone else reported this ? It's a new build so the problem could be elsewhere.

Cheers

Tom
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Old 19th January 2013, 10:02 PM   #2008
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I also tested 125Mhz Fox Xpresso, same noise problem,
but fox is not a SAW oscillator,
I haven't try SAW oscillator yet.
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Old 20th January 2013, 07:02 PM   #2009
Coris is offline Coris  Norway
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Quote:
Originally Posted by KlipschKid View Post
Hi Coris,

I'm using the 125Mhz Fox Xpresso and the sound quality is very good, but when there are quiet moments in the music, I hear crackle - HF spikes - almost like vinyl records. Has anyone else reported this ? It's a new build so the problem could be elsewhere.

Cheers

Tom
Hi Tom
I have read this before (reported by Joe Rasmunssen) about crackles/spikes on using 125Mhz clock. I thought that it were something special with his device, but now you report the same... I can hear exactly the same kind of spikes, in the quiet moments (silence between tracks), but when I used an 133Mhz clock...
Now I just wonder why I do not have such distortions on my device. For me it is working just fine with 125Mhz, and I use this clock frequency for few month now. I used before this last SAW, the Fox oscillators of 122,880 Mhz and 125 Mhz, with very good results too. No any crackle/spikes.
The only difference between our devices/setups it may be this SAW oscillator I use in the last time, quite large decoupling capacities I have on both analogue and digital power rails of ESS9018... And my oscillator is connected very near to the DAC chip (2-3mm from its clock input pin).
Could you publish a picture of your setup around the DAC chip? It may be interesting to find out why this functional difference between our devices...

Last edited by Coris; 20th January 2013 at 07:12 PM.
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Old 21st January 2013, 02:20 AM   #2010
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Hi,

What are you using as an I2S source ?

I have experienced a similar crackle using a WM8805 connected to AMB y2 DAC. To remove the problem I used only the BCLK, LRCLK and DATA from the WM8805 and the DAC worked perfectly. It didn't work at all with MCLK connected and had a crackle until I disconnected GND.

So based on that, I wonder if this might be due to different I2S sources ?

cheers
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