[sdiy] d/a, voltage references & multiplexing considerations

[James Patchell]

I like the Crystal Semi DACs....24 bits...192KHz....can't get much better 
than that...and they are not that expensive...although...a bit tough to 
get...I am planning on using their 8 channel DAC on the FPGA board I am 
going to do (someday).  The Crystal Semi parts are, however, delta sigma 
converters...this helps because you don't need a complicated anti alias 
filter...they might be a little less flexable...

However...the AD1861 would be considered high quality...much better than a 
CD...

At 05:38 AM 1/2/2006 +0100, Karl Ekdahl wrote:
>I'm after a d/a for audio use, high quality. I'm thinking of using a 
>18-bit AD1861 with 0.008% THD (since i have them), is this good for 
>high-quality audio? I assume that i should use a good voltage reference 
>for the analog voltage in so i'm looking for suggestions on components and 
>circuits for that. Also i'm thinking that since it supports 16x oversample 
>i could multiplex it into a number of outs using sample and holds, is this 
>a bad idea?  Also, i'm a little confused as how to wire the 1861 for 
>voltage out, the only thing i found on the net was someone hooking up Iout 
>to SJ and RF to Vout and then tie both together with a cap of mysterious value.
>
>any thoughts appreciated
>
>Karl

         -Jim
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