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VP = 5 V (9 V)

18

1

2

20

16

17

INTERNAL

REFERENCE

VOLTAGE

TRAVELLING

WAVE

DIVIDER

AFC

DETECTOR

AGC

DETECTOR

VCO

3-STAGE

IF-AMPLIFIER

FREQUENCY

DETECTOR

AND PHASE

DETECTOR

9

10

15

7

IF

AGC

12

TUNER

AGC

tuner AGC

takeover

point

TDA9801

VIDEO

DEMODULATOR

VIDEO

AMPLIFIER

19

3

14

11

13

8

BUFFER AMPLIFIER

AND NOISE CLIPPER

FM-PLL

DETECTOR

LIMITER

AMPLIFIER

AF

AMPLIFIER

1 V (p-p)

4

5

6

sound

mute

switch

SOUND

TRAP

SOUND

FILTER

sound

mute

video and

intercarrier

n.c.

MHA879

TPLL

2fPC

VP

VCO2

VCO1

AFC

AF

DAF

CDAF

CVBS

2 V (p-p)

SI

VI

VSO

MUTE

AGC

CAGC

TAGC

TOP

RTOP

ADJ

VIF2

VIF1

GND

Fig.1 Block diagram.