Beko Plasma TV Manuel de service télécharger pdf (Page 39)

C-bus controlled single and multistandard

alignment-free IF-PLL demodulators

TDA9885; TDA9886

1 FEATURES

• 5 V supply voltage

• Gain controlled wide-band Vision Intermediate

Frequency (VIF) amplifier, AC-coupled

• Multistandard true synchronous demodulation with

active carrier regeneration: very linear demodulation,

good intermodulation figures, reduced harmonics, and

excellent pulse response

• Gated phase detector for L and L-accent standard

• Fully integrated VIF Voltage Controlled Oscillator

(VCO), alignment-free, frequencies switchable for all

negative and positive modulated standards via I

C-bus

• Digital acquisition help, VIF frequencies of 33.4, 33.9,

38.0, 38.9, 45.75, and 58.75 MHz

• 4 MHz reference frequency input: signal from

Phase-Locked Loop (PLL) tuning system or operating

as crystal oscillator

• VIF Automatic Gain Control (AGC) detector for gain

control, operating as peak sync detector for negative

modulated signals and as a peak white detector for

positive modulated signals

• External AGC setting via pin OP1

• Precise fully digital Automatic Frequency Control (AFC)

detector with 4-bit digital-to-analog converter, AFC bits

readable via I

C-bus

• TakeOver Point (TOP) adjustable via I

C-bus or

alternatively with potentiometer

• Fully integrated sound carrier trap for 4.5, 5.5, 6.0,

and 6.5 MHz, controlled by FM-PLL oscillator

• Sound IF (SIF) input for single reference Quasi Split

Sound (QSS) mode, PLL controlled

• SIF-AGC for gain controlled SIF amplifier, single

reference QSS mixer able to operate in high

performance single reference QSS mode and in

intercarrier mode, switchable via I

C-bus

• AM demodulator without extra reference circuit

• Alignment-free selective FM-PLL demodulator with high

linearity and low noise

• I

C-bus control for all functions

• I

C-bus transceiver with pin programmable Module

Address (MAD)

• Four I

C-bus addresses via MAD.

2 GENERAL DESCRIPTION

The TDA9885 is an alignment-free multistandard

(PAL and NTSC) vision and sound IF signal PLL

demodulator for negative modulation only and

FM processing.

The TDA9886 is an alignment-free multistandard

(PAL, SECAM and NTSC) vision and sound IF signal PLL

demodulator for positive and negative modulation,

including sound AM and FM processing.

3 APPLICATIONS

• TV, VTR, PC and STB applications.

4 ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA9885T/V3 SO24 plastic small outline package; 24 leads; body width 7.5 mm SOT137-1

TDA9885TS/V3 SSOP24 plastic shrink small outline package; 24 leads; body width 5.3 mm SOT340-1

TDA9885HN/V3 HVQFN32 plastic, heatsink very thin quad ﬂat package; no leads; 32 terminals;

body 5 × 5 × 0.85 mm

SOT617-1

TDA9886T/V3 SO24 plastic small outline package; 24 leads; body width 7.5 mm SOT137-1

TDA9886TS/V3 SSOP24 plastic shrink small outline package; 24 leads; body width 5.3 mm SOT340-1

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 120 121

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Beko Plasma TV Manuel de service Page 39

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