LA1781M datasheet(5/48 Pages) SANYO

부품명	LA1781M

상세설명	For Car Radios Single-Chip Tuner IC

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제조업체	SANYO [Sanyo Semicon Device]

홈페이지	https://www.sanyo-av.com/us/

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5 / 48 page

LA1781M

No.6038-5/48

Operating Characteristics and Symbols Used in the Test Circuit Diagrams

(1) Switches (SW)

Switch on = 1, SW off = 0

There are two switches that use signal transfer.

1) SW2 : switches between the mixer input and the IF input.

2) SW4 : switches between noise canceler input and IF output + noise canceler input.

(2) Types of SG used

PG1 (AC1)

Used for noise canceler testing. A pulse generator and an AF oscillator are required.

AC2

Used for FM front end testing. Outputs an 83MHz signal.

AC3

Used for FM IF, noise canceler, and MPX testing. Outputs a 10.7MHz signal. Stereo modulation must be possible.

AC4

Used for AM testing. Outputs 1 MHz and 1.4MHz signals.

AC5

Used with the MRC. Can also be used for AF and OSC.

(3) Power supply

VCC

8V

VCC1

5V

SD, stereo, seek/stop

VCC2

0.1V/0.7V/2V/4V

Keyed AGC, Mute ATT

VCC3

0.1V/0.6V/2V

These levels must be

variable.

HCC, SNC, SASC (MRC)

(4) (a) Switches

Parameter

ON

OFF

SW1

AM/FM switching. The FE VCC is supplied to pin 62.

FM

AM

SW2

FM IF switching. Pin 51/FE output

FE IF OUT (A)

AC3 (B)

SW3

For conversion gain testing

Conversion gain measurement (A)

Other/purposes

SW4

For switching between noise canceler input and IF output + noise

canceler.

AC1 (A)

Other/purposes

SW5

High-speed SD

Other/purposes

SW6

SEEK/STOP (IF BUFF ON/OFF)

STOP

Seek (IF buffer output)

SW7

MUTE ATT 200k

Ω

MUTE 200k

Ω

OFF

SW8

MUTE ATT 30k

Ω

MUTE 30k

Ω

OFF

SW9

For pilot cancellation testing

When pilot cancellation is used

When pilot cancellation is not used

SW10

Mute off (pin 33)

MUTE OFF

MUTE ON

(b) Trimmers (variable resistors)

VR1

Separation adjustment

VR2

Pilot cancellation adjustment

(5) Test Points

(a) DC voltages

VD1

FM RF AGC voltage

Pin 2

VD2

AM/FM SD, AM Tweet, FM stereo indicator

Pin 26

VD3

AM/FM S-meter

Pin 24

VD4

MRC output

Pin 27

VD5

Mute drive output

Pin 33

VD6

AM antenna damping voltage

Pin 46

VD7

N.C. Gate time

Pin 8

(b) AC voltages

VA1

AM/FM OSC Buff

Pin 4

VA2

First IF output

Pin 53

→ CF → pin 51 load level (10.7MHz)

VA3

IF counter buffer

Pin 23 (10.7MHz/450kHz)

VA4

MPX OUT Left ch

Pin 15 (AF)

VA5

MPX OUT Right ch

Pin 16 (AF)

유사한 부품 번호 - LA1781M

제조업체	부품명	데이터시트	상세설명
Sanyo Semicon Device	LA1781M	567Kb / 50P	Single-Chip Tuner IC for Car Radios

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