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1 V (p-p)

MHA957

VCO

TWD

AND TV AFC

INTERCARRIER

MIXER

FPLL

VIF AMPLIFIER

AND

AGC DETECTOR

RIF AMPLIFIER

AND

AGC DETECTOR

TUNER

AGC

VIF

AGC

VIF

SAW

SOUND

TRAP

VIDEO

DEMODULATOR

AND AMPLIFIER

TV AFC

DETECTOR

INTERNAL

VOLTAGE

STABILIZER

GND

VP

AFC/RIF

level

2

× fPC

TPLL

CVAGC

TADJ

TV/radio

tuner AGC

1

12

TAGC

ViVIF1

ViRIF

ViVIF2

Vo(int)

ViFM

2

LOGIC

4

3

CDEC

forced

mute

soft mute

threshold

adjust

LP0

8

LP2

4.5 MHz

918

11

10

13

7

14

19

16

15

6

5

20

17

VoAF

1.1 V (p-p)

video

FM-PLL DEMODULATOR AND

AF SIGNAL PROCESSING

LEVEL DETECTOR

TDA9809M

10.7 MHz

10.7 MHz

RADIO

AFC

10.7 MHz

ceramic

resonator

Fig.1 Block diagram.