ES9023 / WM8804 S/PDIF "Subbu DAC V3" GB Interest - Page 29 - diyAudio
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Old 26th October 2012, 09:25 PM   #281
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Another thing is that the maximum output of 2 Vrms from the ES9023 DAC and 63uVrms noise gives you only 16 Bit performance at the best, IF we can keep the overall system noise down to the 63uVrms from the regulator.

20uVrms noise gives you the potential of getting 18 Bit performance.

Examples :

2Vrms is +/- 2.8V which gives a signal range of 5.6V.

16 Bit : 5.6/65535 = 85.4uVrms Per LSB
17 Bit : 5.6/131071 = 42.7uVrms Per LSB
18 Bit : 5.6/262143 = 21.3uVrms Per LSB
19 Bit : 5.6/524287 = 10.6uVrms Per LSB
20 Bit : 5.6/1048575 = 5.34uVrms Per LSB

In short, by using that MIC5205 you are limiting the potential performance of the DAC to 16 Bit at the best.

With better regulators 18-20 Bit performance should be possible with a good layout, not that it is trivial to do so, but starting out with limiting the performance to 16 Bit due to the use of an unsuitable regulator is not a good starting point. With a MIC5205 you will never, ever get more than 16 Bit performance, no matter how good the rest of the layout is.

Last edited by Neutrality; 26th October 2012 at 09:33 PM.
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Old 26th October 2012, 10:05 PM   #282
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where does one source the adp151?
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Old 26th October 2012, 11:00 PM   #283
supra is offline supra  Australia
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Quote:
Originally Posted by hochopeper View Post
You guys are crazy right? SMT soldering is not that hard, in fact, it will become the norm for DIY in the future as less through hole parts become available. I understand that with the volume you have in this GB it might actually be financially feasible to supply parts to manufacturer for pick and place and wave soldering. But, for a build that isn't terribly complex, this would be a great place to start with SMT soldering.
Your eyes, hands are a lot younger than mine.
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Old 26th October 2012, 11:07 PM   #284
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Regardless of regulator - the 2.6 version of this dac sounds great compared to many modern designs. I've been listening to it for a good week now , it's very good .
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Old 27th October 2012, 08:50 AM   #285
massimo is offline massimo  Italy
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Quote:
Originally Posted by necplusultra View Post
where does one source the adp151?
Digykey
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Old 27th October 2012, 08:57 AM   #286
Ryssen is offline Ryssen  Sweden
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If the regulators are plug and play,and anyone is going to order from Digikey or similar,I´m in to buy a couple of them.
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Old 27th October 2012, 09:19 AM   #287
massimo is offline massimo  Italy
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IIRC, the main reason why they picked the Micrel reg is because it's one of the few available at 3.6 V. The ES9023, they say, sounds better when "pushed hard" (3.6 insead of 3.3V)
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Old 27th October 2012, 05:27 PM   #288
pchw is offline pchw  United States
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According to the datasheet, 3.3V power supply output 1.9Vrms. So, theoretically, adp151-3.3 will give 18 bits performance at best. O-dac also use the same mic onboard regulator, so I am sure the choice is a good compromise, but it will be interesting to compare which is this hobby all about, IMHO :-)

Åke, the regulator pin outs are compatible, but if you switch to adp151, you also need to replace one resistor, R11, from 130K to 220K.
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Old 27th October 2012, 05:32 PM   #289
qusp is offline qusp  Australia
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the Ti reg I linked is 4.17uV and adjustable, but not hand solderable, yo0u would need a rework station or toaster oven if you didnt get the boards stuffed at the fab

otherwise why not use an adjustable reg like lt1763 and resistor divider to get 3.6v? as with the 9018/12 if the analogue reference supply is pushed harder (these at least are 4v tolerant, I run 3.6-3.75v for AVCC) it does increase performance, but if in the act of doing so you increase the noise floor to a point that limits it much worse, simply because you can get it in a set voltage 3.6v.... seems an odd tradeoff to me.

but hey as you say, different strokes.
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Old 27th October 2012, 06:42 PM   #290
pchw is offline pchw  United States
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Never play with numbers before morning coffee :-)
Quote:
According to the datasheet, 3.3V power supply output 1.9Vrms. So, theoretically, adp151-3.3 will give 18 bits performance at best.
At 1.9Vrms, it should be 19 bit, not 18 (5.3740115366/262143/2*1000000=10.25)

TI is out of my league, but I will try the adp on my second 2.6 board to compare and will see there will be reversible way to use the LT as well. But whatever method to manage the LT to work may introduce more noise, I will see. First thing first, need to start populating my digikey shopping cart ....

The V3 is still in development. So it certainly can have more options to play with, but it will be up to JP and Subbu to decide against their design goal and objectives. I am sure they are also reading this thread.
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