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Sansui 7900Z - Interior Block Diagram of IC; TC9140 P (PLL Synthesizer Control IC) Function

Sansui 7900Z
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99002/8900ZDB/7900Z
3.
INTERIOR
BLOCK
DIAGRAM
OF
IC
e@
TC9140P
(PLL
Synthesizer
Control
IC)
AMwy
PSC
FMw
Programmable
Counter
Channel
Control
Indicalor
Driver
Preset
Memory
Memory
Channel
Digital
Cont?ol
LED
Driver
Memory
Read
Write
Control
Functions
Terminais
to
connect
a
quartz
oscillator
for
generating
a
reference
frequency.
Terminals
to
input
a
signal
for
switching
FM/
AM
band
and
a
signal
for
selecting
the
IF
fine
tuning
in
FM
receiving.
AM
FM
(10.7MHz
—
50K)
FM
(10.7MHz
+
50K}
FM
(10.7MHz)
Terminals
to
input
a
signal
for
selecting
desti-
nations
of
Japan,
USA,
and
Europe.
*
Inputs
of
terminals
E;
and
E,
are
read
and
latched
in
INH
=L
state
and
in
FM/
USA
AM
switching.
Europe
osc
Terminal
to
connect
capacitor
and
resistor
for
the
oscillator
for
determinating
the
speed
of
automatic
search
operation.
The
automatic
store-release
in
the
preset
memory
unit
and
the
conversion
period
to
fast
forwarding
in
manual
selection
of
broadcasting
stations
are
determined
according
to
this
oscillation
fre-
quency.
Terminal
to
input
a
signal
for
switching
the
manual
operation
to
automatic
search
opera-
tion
or
vice
versa
in
the
UP/DOWN
tuning
mode.
“H"
:
Automatic,
“L’
:
Manual
Terminals
to
input
a
signal
from
the
tuning
key.
*
In
manual
operation:
When
the
key
is
kept
depressed
for
0.3
sec
or
more
in
one-step/
one-push
step
feeding,
the
operation
changes
to
fast
forwarding;
when
the
key
is
released,
the
operation
stops
at
the
next
stop.
In
this
case,
even
if
there
is
a
station
on
the
way,
the
station
is
neglected.
*{n
automatic
search
operation
(7900Z):
When
the
key
is
depressed
once,
the
auto-
matic
search
operation
starts
and
stops
auto-
matically
after
having
selected
the
desired
station.
*
A
pull-up
resistance
is
provided
therein.
Indicator
Decorder
Functions
A-STOP
|
Terminal
to
input
a
signal
for
performing
the
automatic
search
stop.
When
a
“H’
level
signal
is
applied
to
this
ter-
minal
during
automatic
search
operation,
the
scanning
operation
stops.
(7900Z
Only)
Terminal
to
input
a
signal
for
storing
data
in
the
preset
memory
unit,
Input/output
termi-
nal
in
which
a
LED
driver
is
provided.
*
When
depressing
the
MEMO
key,
the
MEMO
lamp
comes
on,
Next,
when
any
desired
memory
No.
key
is
depressed,
the
data
on
receiving
frequency
is
written
into
the
memory
unit
and
the
MEMO
lamp
goes
off.
*When
the
MEMO
key
is
depressed
and
the
memory
No.
key
is
not
depressed,
the
fre-
quency
data
is
released
automatically.
Terminals
to
input
a
signal
for
designating
memory
addresses,
input/output
terminals
in
which
a
LED
driver
is
provided.
*
Terminals
M,
to
Mg
designate
the
addresses
of
FM
memory
unit
in
FM
receiving
and
the
addresses
of
AM
memory
unit
in
AM
re-
ceiving.
*
When
depressing
the
MEMO
key
and
any
de-
sired
station
key
of
My;
to
Mg,
the
data
is
written
into
the
memory
unit.
*
When
depressing
any
desired
station
key
of
M,
to
Meg,
the
data
is
read
out.
Terminals
to
output
the
data
for
displaying
the
received
frequency
digitally
and
a
timing
signal.
The
data
fed
to
the
driver
TD6301P
for
dis-
playing
a
static
frequency
and
the
timing
sig-
nal
are
outputted
once
only
when
the
fre-
quency
is
updated
in
sutth
case
as
when
the
power
supply
is
tuned
on,
the
UP/DOWN
key
is
depressed,
the
automatic
scanning
operation
is
made,
the
data
are
read
out
of
the
memory
unit,
or
FM/AM
is
switched.
In
the
ordinary
receiving
state,
this
terminal
is
fixed
to
a
“L”
fevel.
*
Data:
Binary
coded
frequency
data
and
re-
ceiving
band.
*
CK-1, CK-2:
Initialize
and
transfer
clock
sig-
nals.
*
0/5:
For
displaying
50
kHz
during
FM
re-
ceiving
in
Europe.
Terminal
to
output
a
signal
for
driving
the
LEDs
for
displaying
the
linear
scate
on
a
re-
ceived
frequency.
The
LEDs
are
driven
in
push-pull
connection
with
the
terminals
H,
to
Hs.
18
points
at
its
maximum.
Terminals
to
output
a
signal
for
driving
the
LEDs
for
displaying
the
linear
scale
on
a
re-
ceived
frequency.
The
LEDs
are
driven
in
push-pull
connection
with
the
terminals
Zg
to
Z2.
Terminal
to
output
a
signal
from
a
phase
comparator.
This
terminal
can
be
used
for
FM
and
AM,
separately.
Terminal
to
output
a
signal
for
generating
a
sound
“Pee
to
confirm
that
the
key
is
de-
Pressed
correctly.
:
Terminal
to
output
the
muting
signal.
The
ter-
minal
is
kept
in
“L”
level
in
ordinary
state,
and
in
“H”
level
in
muting.
Terminal
to
input
a
signal
from
the
FM
pro-
grammable
counter.
An
amplifier
is
provided
in
the
input.
Terminal
to
input
a
signal
from
the
AM
pro-
grammable
counter.
An
amplifier
is
provided
in
the
input.
Terminal
to
input
a
signal
of
inhibit.
Ordinary
operation
in
“H”
level;
inhibit
operation
in
"L”
level.
4
Terminal
to
input
an
initialize
signal.
This
ter-
minal
changes
to
H
level
in
the
ordinary
opera-
tion
and
to
L
level
in
the
initialize
operation.
GND,
Voo
Power
supply
terminals.
5V
+0.5V

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