Dual Mono wiring for a Vout DAC
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themystical
diyAudio Member

Join Date: Feb 2006
Location: UK
Dual Mono wiring for a Vout DAC

Can somebody please help me with the correct configuration of a wiring the analogue outputs of a dual mono Vout DAC?
I know for a current output DAC its a parallel connection,the Right + is connected to Left + and Right - is connected to L-.
Instinctively, the connection for a Vout DAC is a series connection? ie. R- connected to L+?
However the AKM 4497 Datasheet seems to show a parallel connection, same as a current output DAC? (see attached excerpt)
Attached Images
 AK4497 Dual Mono Wiring.JPG (73.3 KB, 339 views)

 20th May 2016, 09:38 AM #2 DF96   diyAudio Member   Join Date: May 2007 Series connection gives you the sum of voltages. Parallel connection (via ballast resistors) gives you the average of voltages - which is half the sum, when there are two voltages. The only difference is 6dB in voltage level.
themystical
diyAudio Member

Join Date: Feb 2006
Location: UK
Quote:
 Originally Posted by DF96 Series connection gives you the sum of voltages. Parallel connection (via ballast resistors) gives you the average of voltages - which is half the sum, when there are two voltages. The only difference is 6dB in voltage level.

Thank you. So it would appear both methods are feasible? Which of two methods gives the better SNR and/or less THD?

 20th May 2016, 10:25 AM #4 abraxalito   diyAudio Member     Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Judging by the ultra-low values of the Rs in that schematic, its been designed to give the highest SNR measurement possible. However the consequent loading on the DAC chip's opamps suggests SQ (dynamics in particular) is going to suffer rather badly. Do you want to listen to this DAC or get the best possible measurements? __________________ 'The total potential here must be nothing less than astronomical.' 'Nothing less. The number 10 raised almost literally to the power of infinity.'
themystical
diyAudio Member

Join Date: Feb 2006
Location: UK
Quote:
 Originally Posted by abraxalito Judging by the ultra-low values of the Rs in that schematic, its been designed to give the highest SNR measurement possible. However the consequent loading on the DAC chip's opamps suggests SQ (dynamics in particular) is going to suffer rather badly. Do you want to listen to this DAC or get the best possible measurements?
So it is actually a AK4490 Dual Mono DAC and the actual LPF circuit is as per the attachment. I am just using the principles of the AK4497 schematic. The first resistor is 660 Ohms (double what is shown to compensate for the two DAC channels connected in parallel). It sounds very good but I wonder whether I am getting the best results with this configuration and whether I might get better results with a series connection?
Instinctively the series connection should provide better SNR?
Attached Images
 AK4490 LPF Wiring.JPG (67.2 KB, 333 views)

 21st May 2016, 08:46 PM #6 themystical   diyAudio Member   Join Date: Feb 2006 Location: UK Ok so to wire the circuit in series, would I need to soft invert the output of one of the channels? Sent from my iPhone using Tapatalk
 23rd May 2016, 06:57 AM #7 themystical   diyAudio Member   Join Date: Feb 2006 Location: UK So this is the Cirrus way, see page 25 of the WM8740 Datasheet. Completely different but I suspect better. https://www.cirrus.com/cn/pubs/proDa...M8740_v4.4.pdf Sent from my iPhone using Tapatalk
formatcd3
diyAudio Member

Join Date: Jun 2015
Quote:
 Originally Posted by themystical So this is the Cirrus way, see page 25 of the WM8740 Datasheet. Completely different but I suspect better. https://www.cirrus.com/cn/pubs/proDa...M8740_v4.4.pdf Sent from my iPhone using Tapatalk
What board are you using to play with the AK4497?

 23rd May 2016, 11:10 AM #9 themystical   diyAudio Member   Join Date: Feb 2006 Location: UK Don't believe boards for the AK4497 are available yet awaiting the chip to go into mass production in summer? I am playing with the DiyinHK AK4490 boards. Sent from my iPhone using Tapatalk
 23rd May 2016, 11:12 AM #10 formatcd3   diyAudio Member   Join Date: Jun 2015 How many boards are you using/planning to use for the dual mono balanced version, four? Last edited by formatcd3; 23rd May 2016 at 11:15 AM.

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