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In Reply to: RE: Ladder DACs for volume controls. posted by rick_m on October 2, 2014 at 07:24:42:
>Some are, or at least were, just R-2R networks and transmission gates so
>you could use them for four quadrant multipliers (one axis being digital,
>the other the "reference voltage" port) with a little biasing.
I always thought this was an elegant piece of lateral thinking: rather than
connect the DAC's voltage-reference pin to a steady DC voltage, you feed it
the audio signal The value of the DAC's internal resistor ladder is then
set by applying an 8-bit word to the data port.
I first knowingly saw it used in the Mark Levinson No.38 preamp from the
early 1990s, so I am astonished to learn that the Acoustic Research SRC,
which I used 30 years ago, also featured it. I believe that this kind of
control gives an improvement in S/N ratio as the volume setting decreases.
John Atkinson
Technical Editor, Stereophile
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Ladder DACs for volume controls. - John Atkinson 10:52:34 10/04/14 (1)
- RE: Ladder DACs for volume controls. - Kal Rubinson 16:21:22 10/04/14 (0)
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