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Theory
of
Operaton
-
494[l4g4Ap
Servlce,
Vot. 1
Figure
7-26. Simplilied
tune voltage converler.
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In addition
to
ihe six
steering lines
that drive the
steering
gates,
U4025 also
supplies
the
trackc
(coarse)
and
trackf
(fine)
lines,
which control
the track/hold
selector
transistor for
each
converter
side.
Tabte 7-1 9
illustrates
the format
for
ADDRESS
70.
Table
7-20
tists
some
of
the
significant
states
that are
used
to
tune the
DAC.
The third
output from
U4045,
ADDRESS
80,
controls
transistors 01058
and
O2017.
which enable the
write-
back function.
Slorage
Reglsters.
Six
storage
registers
are
used
in
the
circuit, U3015,
U3025, U3035, U3050,
U3060,
and
U3070.
Since both sets
are identical, only
the
coarse
tune
section will
be described.
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ruooeour
Dl
PREAiIPLIFIER
INTEGRATOR
V MODE
OUT
'141&126
7-74