More ramblings about VCDO...

[Paul Maddox]

Tim,

>
>I need an opinion. My VCDO is going to clock at about 2 MHz. But this means 
>that
>my output DAC has to settle in about 0.5 uS. I looked around for 16-bit 0.5 
>uS
>D/As and OUCH! I do not want to spend $50 US on the converter. So my 
>question is
>this: How do you all feel about 12, 10, or even 8 bits for the output DAC? 
>I
>cringe at the thought of stooping to 8 bit DACs. I have ordered samples of 
>some
>slower 12-bit DACs that will reduce my clock speed down to 500 kHz. Yuck. 
>The
>search continues..
>


errrr, you dont need 0.5uS... that woulgive you a playback rate of 2MHZ... 
if you're talking audio say you have a 6KHZ waveform (ouch thats high) and 
say 128bytes perwave, this is 768Khz this means you could use a 1us settling 
time dac.. but how high do you wanna go?
think about it at this frequency most of the harmonics will be inaudible 
anyhow.. I used a DAC0800 for mine, works fine, sounds great and its cheap 
too :-), the output frequency goes up more than high enough for me.

Just a few thoughts

Paul



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