a new multibit DAC chip Arda technologies AT1401 - Page 4

Ken Newton · 8th January 2012, 03:47 PM

I took another look at the email sent to me by Arda. They claimed they will be sampling lead customers within THIS calander quarter.

marcelnl · 8th January 2012, 07:03 PM

now for the big question who the lead customers are and when we see first reviews.....the chip seems very interesting for DIY too.

SoNic_real_one · 8th January 2012, 08:00 PM

On paper all look interesting

Ken Newton · 8th January 2012, 11:32 PM

Quote:

Originally Posted by SoNic_real_one

On paper all look interesting

True. Vaporware isn't confined to the software industry.

5th element · 26th January 2012, 05:06 PM

When I notified them of my interest some months ago now, I was graced with a quick reply also. At the time I was informed that they were hoping for a fall release of samples in 2011. Delays it seems are inevitable, which is fine, I just wonder what it will take until we can get hold of the chips without issues.

ARDA have been selling their other silicon via profusion, so they aren't just a web-page, they do exist and that is most likely where we will be able to get this chip from in the future. I do wonder what the price will be like though.

abraxalito · 27th January 2012, 02:28 AM

I just downloaded their preliminary datasheet and it puzzles me. Any of you DAC experts out there have an answer to this?

The architecture is R-2R ladder yet the output impedance is 400Mohm. I've never seen such a high output impedance from an R-2R part before. What are they doing differently?

The dynamic range figure of 125dB means they're achieving 13dB improvement over the PCM1704. Not to be sniffed at if it turns out to be real

SoNic_real_one · 04:12 AM

mili Ohm maybe

Even my DC laboratory current sources didn't have that.
Let's see... +/- 15.5mA is 31mA swing at full scale. To obtain 400 MegOhm at FS would need a voltage of: 400 x 10e6 x 31 x 10e-3 =12400 x 10e3 Volts. 12.4MV. Something like a lighting bolt.
I think they are calculating something like 1 LSB swing...

No, their compliance voltage is +/-310mV (620mV) on maximum two 20 ohm (40 ohm) resistor... That's very good (on paper) and might give finally something to do brag about to the passive I/V fans

abraxalito · 27th January 2012, 04:41 AM

Current source with milli-ohm Zout?

Highest output impedance of any DAC I've seen to date is from ADI, AD9704 at 200Mohms. That doesn't use R-2R but segmented current sources.

SoNic_real_one · 27th January 2012, 10:52 AM

Of course was a joke. I know to calculate just the Full Scale output impedance.
The "dynamic performance" is similar with PMPO power - everybody claims it but no details on how is calculated.

abraxalito · 27th January 2012, 12:14 PM

Actually there are details on dynamic performance in the realm of communications. I posted up a link about a week ago on another thread (Sound quality vs measurements) to an article by a guy from ADI. In essence you need to test with a higher crest factor signal than a pure sinewave - multitone for example.

8th January 2012, 03:47 PM	#31
Ken Newton diyAudio Member Join Date: Apr 2003 Location: Eastern Pennsylvania	I took another look at the email sent to me by Arda. They claimed they will be sampling lead customers within THIS calander quarter. __________________ Ken

26th January 2012, 05:06 PM	#35
5th element diyAudio Member Join Date: Oct 2002 Location: England	When I notified them of my interest some months ago now, I was graced with a quick reply also. At the time I was informed that they were hoping for a fall release of samples in 2011. Delays it seems are inevitable, which is fine, I just wonder what it will take until we can get hold of the chips without issues. ARDA have been selling their other silicon via profusion, so they aren't just a web-page, they do exist and that is most likely where we will be able to get this chip from in the future. I do wonder what the price will be like though. __________________ What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Droggon Attack!

27th January 2012, 02:28 AM	#36
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	I just downloaded their preliminary datasheet and it puzzles me. Any of you DAC experts out there have an answer to this? The architecture is R-2R ladder yet the output impedance is 400Mohm. I've never seen such a high output impedance from an R-2R part before. What are they doing differently? The dynamic range figure of 125dB means they're achieving 13dB improvement over the PCM1704. Not to be sniffed at if it turns out to be real __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

27th January 2012, 03:56 AM	#37
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	mili Ohm maybe Even my DC laboratory current sources didn't have that. Let's see... +/- 15.5mA is 31mA swing at full scale. To obtain 400 MegOhm at FS would need a voltage of: 400 x 10e6 x 31 x 10e-3 =12400 x 10e3 Volts. 12.4MV. Something like a lighting bolt. I think they are calculating something like 1 LSB swing... No, their compliance voltage is +/-310mV (620mV) on maximum two 20 ohm (40 ohm) resistor... That's very good (on paper) and might give finally something to do brag about to the passive I/V fans Last edited by SoNic_real_one; 27th January 2012 at 04:12 AM.

27th January 2012, 12:14 PM	#40
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	Actually there are details on dynamic performance in the realm of communications. I posted up a link about a week ago on another thread (Sound quality vs measurements) to an article by a guy from ADI. In essence you need to test with a higher crest factor signal than a pure sinewave - multitone for example. __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen


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8th January 2012, 07:03 PM	#32
marcelnl diyAudio Member Join Date: Oct 2007	now for the big question who the lead customers are and when we see first reviews.....the chip seems very interesting for DIY too.

8th January 2012, 08:00 PM	#33
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	On paper all look interesting

27th January 2012, 10:52 AM	#39
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	Of course was a joke. I know to calculate just the Full Scale output impedance. The "dynamic performance" is similar with PMPO power - everybody claims it but no details on how is calculated.

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