[sdiy] PIC help

[Andre Majorel]

On 2009-06-07 19:28 -0600, Scott Juskiw wrote:

> 4. If using an external DAC, is there any advantage to using one
> DAC with lots of multiplexing to get 24 outputs vs. using
> several 8-channel DACs (e.g. TLV5610)?

With more DACs, you can get more (channels x samples per second).
Just one DAC ensures that any two channels are matched. There will
be conversion errors, but the channels will be interchangeable. In
some cases, I suppose that might be desirable.

For example, if you were designing an 8-voice polyphonic
MIDI-to-CV and the refresh rate was so high that you had to use
two DACs, would you use one DAC for CV outputs 1-8 and one for
velocity outputs 1-8 or one for CV & velocity outputs 1-4 and one
for CV & velocity outputs 5-8 ?

> 5. It seems that dsPIC chips don't have enough built-in EEPROM
> to store all the info I want for the presets. Is it best to
> avoid trying to max out the internal EEPROM and use an external
> EEPROM?

A separate EEPROM chip would make maintenance easier when the
EEPROM reaches EOL. Not that this is likely to ever happen, of
course.

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>