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Old 17th February 2013, 04:35 PM   #2151
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Originally Posted by AR2 View Post
do you use Scientific Conversion transformers for your galvanic isolations?
Yes - SC947-02 are used for SPDIF
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Old 17th February 2013, 04:45 PM   #2152
AR2 is offline AR2  United States
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Thank you Ray.
Do you think if there is any possibility of using these outstanding transformers for any other isolation besides S/PDIF, like I2S or I2C, or even USB without DC? I know that they are made with 192KHz in mind, but I could almost bet that 384KHz would not be an issue. Now if they are used for any other purpose there is a question of their termination in my mind, which is already above my knowledge.
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Old 17th February 2013, 09:13 PM   #2153
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Originally Posted by RayCtech View Post
I also use other findings that improve the fidelity by using and programming the chip in quite undocumented and not intended modes.
Is it possible for you to share your findings with our community?
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Old 27th February 2013, 12:15 PM   #2154
Zoran is offline Zoran  Serbia
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Smile ES9008 mono mode ?

Hi
Dustin, (or somebody else)
please
point me how to set the registers for ES9008
model in dual mono operation, 2 dac chips
?
.
As for the model ES9018 that issue is clear enough, for the model ES9008
IS NOT
But in the datas for the ES9008 written values for booth, stereo and mono
mode for the chip, so somehow is possibile to set the registers.
.
I am running now 2 dacs with glue-logic I2S splitted from
standard I2S L/R to I2S L/L + I2S R/R for each chip
want to try avoid glue logic and set with a PIC each chip for each channel
.
Thanks
Z
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Old 27th February 2013, 02:28 PM   #2155
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I am running now 2 dacs with glue-logic I2S splitted from
standard I2S L/R to I2S L/L + I2S R/R for each chip
With your I2S splitting you just run the DAC chips in 2 channel mode and sum the outputs.
Set the DAC up for 8bit true mode and the inputs are sourced correct.
If you can re-arrange the outputs easily you could also run the two channels in opposite phase and sum the re-arranged outputs - this way you get a balanced digital path and reduce both the power rail and gnd noises...

Last edited by RayCtech; 27th February 2013 at 02:36 PM.
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Old 27th February 2013, 03:58 PM   #2156
Zoran is offline Zoran  Serbia
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Thanks Ray
It is already working this way
two identical ES9008 dacs each with own identical power supply
the outputs are already summed, balanced line driver to interstage
bal to SE followed by output SE buffer.
I think that is pin 41 is set to high both dac chip the same?
Maybe the seting one ADDR pin 41 to 0 and other to 1 will be enough?
DACs are without PIC, just factory settings.
(the data inputs are on factory presets inputs, 4 times, same data on 4 pins...)
.
Bcause It is clear in datas that chip are tested in mono mode
values given for mono and stereo mode,
I think to put it in the operation via microcontroller?
And disconnect glue-logic module.
BUT
the datas are confused, and NO clear way how it could be done
with ES9008 model?
...
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Old 27th February 2013, 03:59 PM   #2157
Zoran is offline Zoran  Serbia
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Ray,
Please explain a bit more how to set DACs ES9008 up "for 8bit true mode"?
Thanks
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Last edited by Zoran; 27th February 2013 at 04:05 PM.
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Old 27th February 2013, 06:08 PM   #2158
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Seems you are running the chips in default mode (h/w mode). You need a microcontroller to set the chip to mono and also to set the chip to 8-bit true differential.
Even if you set them with different addresses, they will still power up in default mode (8-channel, etc)

I suppose you have a copy of the datasheet?
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Old 27th February 2013, 06:38 PM   #2159
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Originally Posted by glt View Post
Seems you are running the chips in default mode (h/w mode). You need a microcontroller to set the chip to mono and also to set the chip to 8-bit true differential.
Even if you set them with different addresses, they will still power up in default mode (8-channel, etc)

I suppose you have a copy of the datasheet?
As the I2S are split to L/L and R/R he can get better performance by running in 2 channel mode and setup optional. Only if there are standard L/R I2S would mono setting be required.
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Old 27th February 2013, 06:39 PM   #2160
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Originally Posted by Zoran View Post
Ray,
Please explain a bit more how to set DACs ES9008 up "for 8bit true mode"?
Thanks
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