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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Old 24th July 2014, 05:24 AM   #81
ozcal is offline ozcal  Australia
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I'll take one 0.02 board please.
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Old 24th July 2014, 06:04 AM   #82
Calvin is offline Calvin  Germany
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Location: close to Basel
Hi,

even upsamplang and automatic detection of clockrates, that´s what I iked to hear from You
Think You´re on the way to building a really well sounding DAC
Keep going.

jauu
Calvin
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Old 24th July 2014, 06:18 AM   #83
ekidnah09 is offline ekidnah09  Australia
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Default one 0.02% board

Please put me on the list for one 0.02% board.
Thank you
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Old 24th July 2014, 06:34 AM   #84
TV Man is offline TV Man
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Very nice project!

I'm interested in one or two boards .02

Thanks!
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Old 24th July 2014, 07:20 AM   #85
kazap is offline kazap
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Great project

My wish list:

Id like a 0.01% version please.

24bit depth is more then enough for not limiting the SNR

can you design a variable max voltage/currant through the R2R to achieve the best SNR zone and/or control the Vout/volume in a novel and loss free manner.

Can the opamp output be changed to allow flexible options by using an opamp socket Then users can plug in their chip of choice eg some will want to use the AD844 feedback free route while others will want to "roll" opamps.
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Old 24th July 2014, 08:34 AM   #86
esgigt is offline esgigt  Netherlands
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Quote:
Originally Posted by HpW View Post
Ok, the temperature coefficients on those resistors are very important! Not only telling the 0.0x% precisions!




Nice would be some spline oversampling as WADIA used..

Low level linearity may done as I did using a fast test setup...

See picture
I guess that type of oversampling ought to be implemented in the firm-ware?
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Old 24th July 2014, 08:49 AM   #87
HpW is offline HpW
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Originally Posted by esgigt View Post
I guess that type of oversampling ought to be implemented in the firm-ware?
Yes, this requires a DSP...

Hp
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Old 24th July 2014, 11:29 AM   #88
soekris is offline soekris  Denmark
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Quote:
Originally Posted by kazap View Post
Great project

My wish list:

Id like a 0.01% version please.

24bit depth is more then enough for not limiting the SNR

can you design a variable max voltage/currant through the R2R to achieve the best SNR zone and/or control the Vout/volume in a novel and loss free manner.

Can the opamp output be changed to allow flexible options by using an opamp socket Then users can plug in their chip of choice eg some will want to use the AD844 feedback free route while others will want to "roll" opamps.
I decided on 28 bit, to have headroom for a perfect digital volume control. At -72 db volume you still have 16 bit resolution with perfect linearity thanks to the sign magnitude architecture.

Can't change voltage/current though the R-2R network, is already optimized.

The LME49724 is only available in SMT, and I also don't like sockets.... Normally I like discrete amplifier designs, but the opamps choosen are the best. And the "raw" R-2R resistor string outputs are available for anybody who have different opinions on buffers....
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Old 24th July 2014, 11:31 AM   #89
kuribo is offline kuribo
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interested in 3 boards...
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Old 24th July 2014, 11:36 AM   #90
Eldam is offline Eldam  France
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Wow..... I need to improve my soldering skills if such a project gets born with a bare pcb to be populated!

If not too expensive with FGPA already soldered, I'm in !
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