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F U N C T I O N S O F I C 3 O 3 T E R M I N A L S
I
S{urve
I Input
DOWN
MANU
I -
M E M O
I n p u t
When UP search is indicated, holds at low for more than 5 msec.
when low level is maintained during uP search, search continues even when s{urve
voltage is applied to S-Curve terminâI.
Auto search station selection input terminal.
Starts DOWN search at low, stops when S-Curve voltage is applied to S{urve terminal
and after AFC operation.
When DOWN search is indicated, holds at low for more than 5 msec'
when low level is maintained during DowN search, search continues even when s-curve
I -
Manual station selection state is cancelled when any one of the UF,DôWN
or channel
input terminals goes low.
-
Preset memory input terminal.
-
Enables memory while it is holding at low.
-
The external comparator output signal which forms the A/D convertel during manual
mode is applied.
-
At high, counts up 10 bits data and ladder output voltage rises.
At low. counts down 10 bits data and ladder output voltage decreases.
Output terminal which controls radio sensitivity during auto search.
At low only during search; usually at high.
;T*-
Pin No. Pin Name
Input/Output
Function
I
C R r
Input/Output
Generates LSI system basic clock signal by connecting to CR time constant circuit and
forming oscillator circuit. (oscillation period: 0.8 msec)
2
CRz
Input/Output
Forms timer circuit by connecting with CR time constant circuit.
Determines pulse width, etc. of MUTE output signal during band switching.
(operation time: 0.5 sec)
J
BUC
Input
Back-up control terminal; is in back-up state at low level
TEST
Input
TEST terminal of LSI internal circuit.
In TEST state at high level.
f
F M
Input
FM band input terminal.
At low, achieves FM reception state and maintains it even if it later goes high.
( H o l d s a t l o w f o r m o r e t h a n 5 m s e c . )
6
MW
Input
MW band input terminal.
At low, achieves MW reception state and maintains it even if it later goes high
( H o l d s a t l o w f o r m o r e t h a n 5 m s e c . )
7
LW
Input
LW band input terminal.
At low, achieves LW reception state and maintains it even if it later goes high.
(Holds at low for more than 5 msec.)
8
F/A OUT
Outpu
Outputs control signal which indicates band reception state.
F M b a n d . . . . . h i g h
AM band
low (MW/LW)
l o
M/L OUT
Output
Outputs control signal which indicates band reception state.
M W b a n d . . . . . h i g h
L W b a n d . . . . . l o w
Not used in this model.
l 0
CV OUT
Output
Output of analog signal transfer gate; outputs varactor impressed voltage.
Input qi analog signal transfer gate; inputs ladder output voltage.
1 1
CV IN
lnput
t 2
Manu Tune
Input
Input of analog signal transfer gate; inputs
l:"19,'
Inputs S-Curve voltage of F-M, AM.
tuning voltage generated by vari4ble
-
Input of LSI comparator; inputs control signal for AFC operation'
.Auto search station selection input terminal'
Starts UP search at low, stops when S-Curve voltage is applied to S-curve terminal
after AFC operation.
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