CXA8042 on the Sony DVP-S9000ES - diyAudio
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Old 26th March 2002, 04:48 AM   #1
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Question CXA8042 on the Sony DVP-S9000ES

Hi all:

I tried to install the LCaudio Zapfilter mk2 on the DVP-S9000ES last night. I found that this DVDP using the CXA8042AQ. Ofcoz I cant find any datasheet for it. But I've got some info about this. I follow the info and replace the 1.5K resistor on the pin19 to 3K which for adjust the output current of the DAC...

Then I tried to connect the output direct to the Zapfilter in the current in mode. It cant work..... actrally I found that there have 4V output from the positive and netgative from the output of the CXA8042... and the zapfilter have 8.2V-8V output......

Then I tried to add on the 10ohms bewteen the output of the 8042 to the zapfilter.. also cant work.... when I connect the 8042 back to the I/V of the 9000ES... it becomes normal again...

Question is how can I using the direct output to the zapfilter working at the current input mode? Is there have some tweak or special connection of this to zapfilter?

Actrally I tried to connect the input to the zapfilter share with the I/V satge.. it is not enough gain and seems cutoff the bass..... Any solution on this.... Or I have to connect this in voltage mode after the I/V stage from the 9000ES to zapfilter?

I know it will work but it is not the best way to use the zapfilter.... please advise. Thanks!
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Old 26th March 2002, 06:27 AM   #2
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I have also tried to connect ZAPFilter MKII to my Sony-9000ES but with no luck so far.

I have been thinking that maybe it could be possible to connect the ZAPFilter to the IC105 CXD9556AQ but I dont have any data sheets for that Chip.

The only thing I know about the chip is that its an D/A Converter and digitalfilter. It converts everything to DSD (PCM also).

What is a Current pulse D/A (CXA8042AS)???

I have sent scematic of the DAC / Output stage to LCAudio about 3 months ago but I havent recieved any answer from them.
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Old 26th March 2002, 06:47 AM   #3
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Hi:

Actrally I just know some info of the CXA8042.... if any fulse on it please forgive.....

I checked some of the Sony CDP and SACDP like 55ES, 777ES(SACD), 555ES(SACD), 9000ES(SACD).... also find that they seems using the same DAC.... As I know all of the Sony DAC network is covert the signal to the pulse which just like the method of the SACD... That's why some guys saying the SACD is not the new Tech.... On the CDP must have the one of the chip call " Pulse convertor" That means they have to change the signal to the current pulse format to their DACs...

But when I saw the installation instruction on the LCaudio about zapfilter on the 50ES.... I suddently think maybe their output just like the simple current DAC.... When I follow the circuit of their DAC... I found that they are all output in balance mode then each phase have the seperate I/V stage... after that go to the filter and join the signal again....

So... I think if we cannot connect it directly from the DACs.... maybe we can connect the signal after the I/V stage.... ofcoz must be working at the voltage mode for the zapfilter... and you will found that maybe the output will be little bit over... so we have to replace the the resistors at the CXA8042AQ pin19 to the 3K0. Lcaudio said it using as the output limit... replace the higher value resistance to make the output lower and have the better offset....

Yes! They're right! I found this resistor in the same value in the Sony CDP which using the their DACs....

But I still dont know why even I replace the resistor still have the 4V at the output stage when the DAC stand alone.... and I wounder is it need some of the network connection to zapfilter to reduce the voltage?!

Unlucky that we cannot find the datasheet for this 8042AQ.... So cant completely understand how it working.... even I still dont know how to idenitfy the phase of the DAC..... Just try it out only.....

So hope someone can have the kindly help on this.... or have to connect the zapfilter after the I/V stage only!!
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Old 26th March 2002, 06:50 AM   #4
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Hey audio_cf:

Would you mind to send the circuit which you copied from the 9000ES to me? I confuse what I copy maybe have some fault....

thanks!

e-mail: matthew@audioxtension.com

Many many thanks!!!!

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Old 26th March 2002, 07:00 AM   #5
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Hi, Hatasa

I will send it so you have it tomorrow. I will have to rescan it.

Best regards

Carl-Fredrik
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Old 26th March 2002, 07:30 AM   #6
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Thanks! Many thanks! Waiting for your mail......

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Old 26th March 2002, 08:15 AM   #7
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Thanks! I've got this! Thanks!!!!!

How can you get this??

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Old 26th March 2002, 08:27 AM   #8
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I have a good friend working with region modifications he had the service manual so I copied the intressting pages.

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Old 26th March 2002, 07:47 PM   #9
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Zapfilter on the 9000ES
------------------------------
I installed the zapfilter on the 9000ES with the voltage mode, the
improvement just make me suprise.... Full range have the very good extensionand very balance... bass extend to the very deep level and the bandwidth of the full range have the improvement too! Actrally I tried to replace the I/V opamps to the OPA2604(Top model of the Burrbrown Dual opamp) have more 15% improvement of the blackground noise... and provide more detail on it.. funny that the sound have little warmer..

Then I tried the AD825 modules from the LCaudio. Crazy extention and the sound more clear and transparent... more 15% improve from the OPA2604....

I still waiting for the replay from the LCaudio for the solution of the current mode.. and still dont know what's wrong with the DAC current output..... I think they maybe have the special network before input to the zapfilter...
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Old 27th March 2002, 03:10 PM   #10
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Default Zapfilter on the 9000ES

[QUOTE]Originally posted by hatasa
[B]Zapfilter on the 9000ES
------------------------------

The Zap filter is set for CD replay and should limit bandwidth. SACD haas considerable energy above 20KHz. The ZAP is probably rolling off early!
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