[sdiy] Suitable DACs for Demultiplexing

[George Hearn]

If one has a few quid spare (or just requests samples, which ADI are good at
supplying) then you can get a range of multichannel DACs these days.  These
negate any requirements for multiplexing or sample and hold and are tiny.
Take the AD5371, it's got 40 channels, one DAC per channel plus gain and
offset DACs in a tiny package with very few external parts.  There are
8/16/32 channel options and a range of resolutions.  The DACs are fast
enough to have a refresh rates up to audio frequencies so you can add LFOs,
env's etc to each channel if you're cpu is fast enough.
  They are expensive, but one must contrast this against the better
reliability and performance, reduction in size and assembly costs over a
traditional sample and hold topology.  If these were available in the
Jupiter/Prophet/OB- days they would have been very useful!  George

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Justin Owen
Sent: 22 October 2009 09:25
To: Tom Wiltshire; Synth-DIY List
Subject: Re: [sdiy] Suitable DACs for Demultiplexing

-----Original Message-----
From: Tom Wiltshire [tom at electricdruid.net]

>Can anyone give me any guidance about which types of DACs are good  for
this application?

Tom,

Note sure if this will help, but Colin Fraser sent me a link in August of
this year as part of a thread I started called "Micro as a Linear to
Exponential converter?"

http://www.sequentix.com/gx1/

He also mentioned that he'd been using a 4051 Mux to get 8 outputs from a
LTC1597 DAC.

Maybe there'll be some info there.

I've recently started using a TLV5618 Dual 12-bit DAC driven by an
Arduino/ATMega 328 and was hoping to do what you're trying to do using a
4052 Mux - so I'd definitely be interested in your progress.

HTH,

Justin


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