Ferranti's ZN426-8 is an 8-bit
monolithic digital to analogue
converter containing an R/2R
ladder network with precision
bipolar switches and a 2.5 V
precision voltage reference.
The circuit shown here is connected
to the PC's parallel
printer port, and provides a
simple means of communication
with the analogue world. It
is capable of generating as well
as reading voltages between 0
and 2.55 V in steps of 10 mV.
The ZN428 also as an A-D
converter with the help of a
comparator. The circuit is powered by an external 5-V source,
and controlled by a small Pascal Program.
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