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Old 13th March 2006, 07:48 PM   #21
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Quote:
Originally posted by Lyra
My thoughts was that a truncaded 20->18bit signal could! be worse than a "low end 18-bit ADC", or a 16-bit signal...!???
As far as I know (they told me...) the engineers at Lexicon have tried to replace CS5389 with CS5390...the closest chip available today with no luck...
CS5390 is 20-bit...and pin to pin compatible with CS5389 as far as I know.

When it comes to CS5396: what a $&ck is psychoacoustic output ???...don't understand this part.....yet...

As far as TAS3103A concerned, I just might try this appoach....
A lot of unneccesary functions though...but can be matched with whatever ADC I want to choose...big advantage !!

Many devices get away with a 2 bit truncation. The Audionote DACs for a start.
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Old 13th March 2006, 07:52 PM   #22
Lyra is offline Lyra  Norway
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Quote:
Originally posted by rfbrw



Many devices get away with a 2 bit truncation. The Audionote DACs for a start.
This unit uses AD1865 as DAC after the DSP-unit...

Lyra
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Old 13th March 2006, 08:03 PM   #23
phn is offline phn  Sweden
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Meaningless post, perhaps.

But being that we are talking about an expensive and highly sough-after piece of gear, there has to be sombody (not necessarily here) that can help. I googled. Nothing. I cannot believe this.

I will talk to a friend into these things tomorrow. I'll be meeting him anyway. Don't expect anything. But this bugs me.
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Old 13th March 2006, 11:04 PM   #24
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Quote:
Originally posted by Lyra


This unit uses AD1865 as DAC after the DSP-unit...

Lyra

CS5389 ADC. AD1865 DAC. Not exactly a bargain basement design then. To think you would defile it with a CS5330A. They used to burn people for less than that.

If it was available I'd try out the CS5390. It has exactly the same pinout as the CS5389. Failing that, I'd use the CS5396.
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Old 13th March 2006, 11:06 PM   #25
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Quote:
Originally posted by rfbrw



Many devices get away with a 2 bit truncation. The Audionote DACs for a start.
The SAA7000 in 14 bit mode and the DF1700 in 18 bit mode.
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Old 16th March 2006, 08:41 AM   #26
Lyra is offline Lyra  Norway
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Quote:
Originally posted by rfbrw



...If it was available I'd try out the CS5390. It has exactly the same pinout as the CS5389. Failing that, I'd use the CS5396.
The CS5390 has been tried by the guys at Lexicon, and it do not work...I was told !

When it comes to CS5396 I can't figure out what psykoacoustic output is. It seems like something that could be changed when it comes to number of bits, but I don't understand if this is the audiosignal, or something meant for stearing of some kind of DSP !?
(I can't figure out where to get some of theese either...)


Another approach is to try AD1879 (also obsolete, but available !?) , but I don't have a price in this chip yet. Probably pricey !!?
They should work...right?
...with the right pin-adapter of course...

...and TAS3103A...feels something like shooting sparrows with a big cannon...



Lyra
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Old 16th March 2006, 10:02 AM   #27
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Quote:
Originally posted by Lyra


The CS5390 has been tried by the guys at Lexicon, and it do not work...I was told !
So they say. They are as capable of making mistakes as anyone else. I'd rather find out myself.

Quote:

When it comes to CS5396 I can't figure out what psykoacoustic output is. It seems like something that could be changed when it comes to number of bits, but I don't understand if this is the audiosignal, or something meant for stearing of some kind of DSP !?
(I can't figure out where to get some of theese either...)
The the psychoacoustic output is the dithered and noise shaped bit reduced output. It is used to avoid the effects of simple truncation. The CS5396 just goes that little bit further than most devices in that it allows some control over the noise shaping process. It does require a microcontroller though.

Quote:

Another approach is to try AD1879 (also obsolete, but available !?) , but I don't have a price in this chip yet. Probably pricey !!?
They should work...right?
...with the right pin-adapter of course...
Bought one around 10 yrs ago. Ceramic body, lots of gold and made by Analog Devices. Definitely expensive.

Quote:

...and TAS3103A...feels something like shooting sparrows with a big cannon...

Lyra
But this is a very special cannon. There is still enough of the sparrow left to feed a small cat.
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Old 18th March 2006, 02:50 PM   #28
phn is offline phn  Sweden
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I haven't forgot about this. I only forgot to write that I have yet to meet up with the guy. I haven't been able to ask. Again, don't expect anything. But at least I can give it a try.
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Old 18th March 2006, 03:33 PM   #29
Lyra is offline Lyra  Norway
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Since last time I posted i have found 2 other ADC's that just might could do the job...

#1: Philips UDA1361TS: http://www.semiconductors.philips.co...DA1361TS_2.pdf

#2: Wolfson WM8782: http://www.wolfsonmicro.com/uploads/.../en/WM8782.pdf

The Philips part claims that it could do 18-bit output, but I havn't been able to figure out how to set it up for 18-bit (yet...?), and it is a bitstream converter...that don't exactly make me crazy about it.

The Wolfson part on the other hand have pretty decent data, but this one should probably be set up with 16-bit out, and then (if it's neccesary...) make this data-word act as 18-bit with some glue logic.

Some in here claims that this is not neccesary, but I don't understand that part as this had to be done when they try to make a NONOS DAC with something else than TDA154x's...!? ...for instance AD1865...and this is by the way the DAC at the end of this equipment.
I have to assume that the DSP in this box expect's the data-format in a similar way...especially when the old ADC is configured that way.

When it come to TAS3103A...I feel this one is way above what I understand...had to be configured via I2C for instance...
Lyra
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Old 19th March 2006, 03:29 AM   #30
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I take it no one actually misses this particular piece of kit.
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