LA70100M

No.7204-9/16

(6) REC-BELL filter, PB-A-BELL filter

4.3MHz A-BELL FILTER CHARACTERISTICS

4.3MHz BELL FILTER CHARACTERISTICS

It is an internal filter of which center frequency is fitted to 4.286MHz by automatic adjusting circuit (described later) that

uses input frequency (fsc), thus prevents this filter from affected by external components.

(7) REC-A-BELL filter, PB-BELL filter

1.1MHz A-BELL CHARACTERISTICS

1.1MHz BELL CHARACTERISTICS

It is an internal filter of which center frequency is fitted to 1.0715MHz by automatic adjusting circuit (described later) that

uses input frequency (fsc), thus prevents this filter from affected by external components.

(8) BELL/A-BELL filter frequency automatic adjustment

CONTROL

LOGIC

PROGRAMABLE

COUNTER

DIVIDER

MODE CONTROL

4.286MHz

BELL/A-BELL

OSC

ENABLE

GATE

CLOCK for COUNT UP

CLOCK for COUNT DOWN

DIFFERENCE

D0

CONTROL

CLOCK for COUNT DOWN

CLOCK for COUNT UP

MODE CONTROL

Fig.8 (a)

VOLTAGE CONTROL

UP/DOWN COUNTER

UP/DOWN COUNTER

4.43MHz CLOCK

C.SYNC

V.SYNC

GATE

DIFFERENCE

DIVIDER

PROGRAMABLE

COUNTER

DIVIDER

DIVIDER

1.0715MHz

BELL/A-BELL

OSC

D1

D2

D3

D4

D5

CONTROL

VOLTAGE CONTROL

D0

D1

D2

D3

D4

D5