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Pin numbers for TDA9881HN in parenthesis.

Fig 1.

Block diagram.

mhc504

SINGLE REFERENCE QSS MIXER

INTERCARRIER MIXER

DIGITAL VCO CONTROL

AFC DETECTOR

RC VCO

VIF PLL

VIF AGC

TUNER AGC

SUPPLY

SIF AGC

AUDIO PROCESSING

AND SWITCHES

NARROW-BAND

FM PLL DEMODULATOR

SOUND TRAPS

4.5 MHz to 6.5 MHz

TAGC

VAGC

TOP

14 (15)

VPLL

19 (21)

9 (8)

22 (24)

15 (16)

21 (23)

4 (2)

10 (9)

11 (10)

12 (11)

18 (20)

20 (22)

2 (31)

1 (30)

(18) 17

(7) 8

(3) 5

(4) 6

external reference signal

or 4 MHz crystal

REF

AFC

FMSO

CVBS

FM sound output

video output: 2 V (p-p)

QSSO

FM1

FM0

VP

3 (1)

i.c.

AGND

7 (5)

DGND

LOGIC

13 (14)

16 (17)

AMUTE0 VIF0

FMPLL

DEEM

AFD

single reference

QSS output

FM PLL

filter

VIF PLL

filter

de-emphasis

network

VIF2

VIF1

24 (27)

23 (26)

SIF2

SIF1

TDA9881