LA1781M データシートの表示（PDF） - SANYO -> Panasonic

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LA1781M

For Car Radios Single-Chip Tuner IC

SANYO -> Panasonic 

Continued from preceding page.

Pin No.

Pin function

20

VCO

LA1781M

Pin description

The oscillator frequency is 912Hz.

KBR-912F108

(Kyocera Corporation)

CSB-912JF108

(Murata Mfg. Co., Ltd.)

Equivalent circuit

CSB

912

JF104

20

VREF

10pF

21

PHASE COMP.

22

PHASE COMP.

VREF

15kΩ

+

15kΩ

19kΩ

21

22

23

IF counter buffer seek/stop

switching

This pin functions both as the IF

counter buffer (AC output) and as the

seek/stop switch pin.

The voltage V23 switches between

the following three modes.

During FM reception :

5V : Seek mode

2.5V : Forced SD mode

0V : Reception mode

AM reception

(two modes : 0 and 5V)

5V : Seek mode

0V : Reception mode

4.9V

+

--

SW

+

--

SD circuit

50kΩ

10kΩ

AM MUTE

1.3V VCC IF counter

buffer

150Ω

50F

23

51kΩ

IF

BUFF.

STOP

Forced SEEK

SD:2.5V 5V

Continued on next page.

No.6038-9/48

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