In the brochure "Understanding and ApplyingDigital Potentiometers" written by
Chris Hyde and Dave Lunsetter, I found a good overview of different digipots
in different applications published by Analog Devices.
3 wire links from a AD5290 to a microcontroller proto board observe me, that the
AD5290 obvious can not reach absolute zero and also can not reach absolute max.
values if used as three terminal potentiometer (as voltage divider).
My personal selection of AD5290 is based on a must of +-15V (AC/DC) range and 8bit
resolution and avail. in several kOhms ranges.
Is there an other architecture avalilable from AD with virtual absolute connection
of W to A and W to B, when applied as potentiometer to get a FULL range potentiometer?
It is fully clear to me, that a minimal resistor value of some ten ohms is left if used
as rheostat, as potmeter not relevant.