[sdiy] Re: Inexpensive 16 bit DAC?

[karl dalen]

--- Tim Parkhurst <tparkhurst at siliconbandwidth.com> wrote:

> 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:

Xpander and Matrix 12 dont use 8 bits, they use 14 bit DAC,
and to achive even higher resolution they first mux 14 bits
into a down scaled (gain less then 1)buffer, next they
put out 14 bits these are added to the Cv value stored 
in the down scaler buffer, result , very high and not
needed resulotion!!

OB8 uses the same DAC 3140.

U814, U815 and R849 are the down scaler, U813 are
the summing inverting buffer for the two voltages.

Reg
KD