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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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