[sdiy] Re: Inexpensive 16 bit DAC?

[Luís Marka]

Or why not go with the Analog Devices DAC312HP (or HS, for the surface mount
option)? It is a 12-bit DAC, equivalent to the AM6012, used in the
Memorymoog and Jupiter 8.

----- Original Message ----- 
From: "Tim Parkhurst" <tparkhurst at siliconbandwidth.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, April 28, 2005 2:45 PM
Subject: RE: [sdiy] Re: Inexpensive 16 bit DAC?


> What about the trick Oberheim used on the Matrix 12? Or was it the OB
> series? Anyway, they used an 8 bit DAC, but in places where they need
higher
> resolution (VCO fine tune, fer example), they used a fairly simple trick
to
> get (approx) 12 to 13 bit resolution:
>
> Set DAC Vref to its 'normal' level. Say +10V
> Convert 8 MSB, store analog result in S/H
> Set DAC Vref to lower level. Say 1V
> Convert 8 LSB, add analog result to MSB conversion.
>
> Basically, you take two 8-bit samples, but you change the Vref for the LSB
> sample and add the two results. The voltage levels I have listed above are
> only examples, but you get the basic idea.
>
>
> Tim (lots of basic ideas) Servo
>
> "Imagination is more important than knowledge." - Albert Einstein
>
> **********************************