Beko Plasma TV Manuel de service télécharger pdf (Page 40)

C-bus controlled single and multistandard

alignment-free IF-PLL demodulators

TDA9885; TDA9886

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6 BLOCK DIAGRAM

handbook, full pagewidth

MHC108

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

SINGLE REFERENCE QSS MIXER

INTERCARRIER MIXER

AND AM DEMODULATOR

SOUND TRAPS

4.5 to 6.5 MHz

TAGC

VAGC(pos)

AGC(neg)

VAGC

(1)

TOP

14 (15)

VPLL

19 (21)9 (8) 16 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

AUD

CVBS

audio output

video output: 2 V (p-p)

[1.1 V (p-p) without trap]

SIOMADSDASCL

MAD

AGC

(6, 12, 13, 14, 17,

19, 25, 28, 29, 32)

n.c.AGND

7 (5)

DGND

OUTPUT

PORTS

C-BUS TRANSCEIVER

22 (24)3 (1)

OP1 OP2 FMPLL

DEEM

AFD

sound intercarrier output

and MAD select

FM-PLL

filter

VIF-PLL

filter

de-emphasis

network

VIF2

VIF1

24 (27)

23 (26)

SIF2

SIF1

TDA9885

TDA9886

Fig.1 Block diagram.

(1) Not connected for TDA9885.

Pin numbers for TDA9885HN in parenthesis.

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 120 121

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Beko Plasma TV Manuel de service Page 40

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