Technics ST-9038 User Manual

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PLL
SYNTHESIZER
This
PLL
lC is designed
for
CB
and has various functions,
which include the following
components.
(1
)
Programmable
frequency
divider
Changing the level
of
terminal
@
V to
"O"
(l-
level)
causes
P1
-
PB
to
be directly connected
to the
program
terminals
of the
programmable
divider.
Then
the
programming
is
performed
in
accordance
with the
binary codes and
frequency
dividing
can
be done
up to
3
-
255. P1
-
P6
are used in this equipment,
but
P7
and
PB
are
not
used
Also, P6
is
fixed
at
"1",
and the codes
added to
Pl
-
Pb
make
the
frequency
divíding ratio
variab
le.
(2)
Reference frequency
oscillator
and its frequency
divider.
Connecting
a crystal
oscillator element
to
X1
-
X2 makes
higher
precision
frequencies
obtainable.
ln this
case a 12.5
KHz crystaloscillator
element
is connected,
and the frequency
is
divided
by the
divider
with a stage
of
FIF
and
9 bits, thus obtaining
the reference
frequency
as the
comparison
frequency
of
the
PLL.
(3)
Phase
comparator
The reference
frequency
12.5
KHz
obtained
in
(2)
is compared
with the
12.5 K{zobtained by
division of the Vco,
and the difference in
phase
between these two,
if any, appears at the
output
of the
phase
comparator.
il^
1-5-2
Frequency
division
in
fixed
code
presetting
fín
Contents
of
74L5192
9-1
9-2
5
Borrow.out
of
7
4L5192
t
o
I
(o)
I
9
o
$
Contents
of
lPD861C
Output of
,¡
PD861c
A 74L574
-O
B. 74L574
D
B
74L574
A
o
57
56
t
(
Load
signal)
5

Technics ST-9038 Specifications

General

Brand	Technics
Model	ST-9038
Category	Tuner
Language	English