Sansui 5900Z - Page 5

59002/49002/3900Z
Pin
No.
14
15
16
17
19
Input /
Output
UP Input
Input
MANU input
mae “
| M-U/D input
Output
_ uPC1161C (MPX
Description of Function and
Operation
Automatic search input pin
At L level, UP search starts and
continues its operation until S-
curve voitage is fed to S-Curve
input pin and AFC operation is
completed.
Automatic search input pin
At L level, DOWN search starts
and continues its operation until
S-curve voltage is fed to S-Curve
input pin and AFC operation is
completed.
Manual tuning select pin
At L Jevel, manual tuning func-
tion is selected. When UP or
DOWN input pin is turned to L
level, manual tuning function is
released.
Preset memory function input pin
During L level is held, memory
operation is available.
Output voltage of external com-
parator which composes analog/
digital converter is fed to this
input pin.
i At H level, 10 bit data counts up
and output voltage of external
ladder resistor increases.
At L tevel, 10 bit data counts
down and output voltage of ex-
ternal ladder resistor decreases.
Tuner sensitivity control pin
When automatic search tuning is
in operation, pin voltage holds L
level. Normally H level.
IC)
Pin Input/ Description of Function and
No. Output Operation
20 Output | Indicator signal output pin of
manual tuning
When manuai tuning function is
selected, output turns to L level.
Power supply is connected to this
pin.
+9 Vtyp: Normal operation
+5 V typ: Back up operation
21 VDD
22 | MUTE Muting control signal output pin
H fevel is held when automatic
search tuning, preset tuning or
band selection is in operation.
Output
23 | F-Tune | Output
Output pin for fine tuning
AFC voitage is generated by con-
necting external low-pass filter.
Reference voltage (+8 V typ) is
supplied for internal digital/analog
converter and reference compara-
tor level window comparator.
25° 661. B10
Output | Output pins of 10 bit UP/DOWN
34
counter (incl. buffer for ladder re-
sistor)
The outputs are converted from
| digital to analog voitage by exter-
| | nal ladder resistor (R = more than
| | 10 kQ}
| Ground pin of LSI
| Memory channel input and sekc-
ted channei indicator output pins
| At L level, memorized station is
tuned, and when MEMO pin is L
level, a tuned station is memorized.
Input/
Output
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11 9
Voltage Regulator |
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6th
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Level
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Drive
Drive
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Audio
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Audio
Mute
5
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