24 to 18 bit conversion ??? - Page 2

rfbrw · 9th March 2006, 11:09 AM

You could also try looking for the Swiss Army knife of ADC's the CS5396. Failing that, the nearest thing in current production is the Wolfson WM8785

Lyra · 9th March 2006, 12:19 PM

Quote:

Originally posted by rfbrw
J........TI also have an 18 bit dac but it is considerably more expensive than any other ADC and requires an external decimation filter.

The ADC You are referring is PCM1750 I presume ?
I have looked at this but the appropriate decimation filter (DF1750) is no longer available from TI. Is there any other usable filters available ? I can't find any !?
When it come to cost...if this is what it takes to get it working...this is the way I have to go...

Whould it be better to use a 16-bit ADC instead of a 20 or higher ?
(....will not loose any data or something like that ???)

Lyra

Lyra · 9th March 2006, 12:35 PM

I can get (I think....

) CS5330A in small quantities, an for what I can see this little ADC could be just perfect for this, but I am a little concerned about the dynamic range...it's just 94dB, versus the original CS5389's 107dB (both A-weighted)
This is PA equipment and I am a little concerned that 94dB just might be a little small number !?

macboy · 9th March 2006, 03:03 PM

I'd use a TI TAS3103. It is a simple little DSP which can input and output virutally any format at virtually any bit depth. And it can provide you with dithered 18 bit signal if you wish, rather than truncated. You do not need to write a single line of code to use this DSP; you just configure it.

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9th March 2006, 11:09 AM	#11
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	You could also try looking for the Swiss Army knife of ADC's the CS5396. Failing that, the nearest thing in current production is the Wolfson WM8785

9th March 2006, 12:35 PM	#13
Lyra diyAudio Member Join Date: Nov 2003 Location: Norway	I can get (I think.... ) CS5330A in small quantities, an for what I can see this little ADC could be just perfect for this, but I am a little concerned about the dynamic range...it's just 94dB, versus the original CS5389's 107dB (both A-weighted) This is PA equipment and I am a little concerned that 94dB just might be a little small number !?

9th March 2006, 03:03 PM	#14
macboy diyAudio Member Join Date: Oct 2003 Location: Ottawa, Canada	I'd use a TI TAS3103. It is a simple little DSP which can input and output virutally any format at virtually any bit depth. And it can provide you with dithered 18 bit signal if you wish, rather than truncated. You do not need to write a single line of code to use this DSP; you just configure it.

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