Hitachi C28W440N, Service Manual

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36
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4 MHz reference frequency input [signal from Phase-Locked Loop (PLL) tuning system] or
operating as crystal oscillator
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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
•
Precise fully digital Automatic Frequency Control (AFC) detector with 4-bit digital-to-analog
converter; AFC bits via I²C-bus readable
•
TakeOver Point (TOP) adjustable via I²C-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
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Sound IF (SIF) input for single reference Quasi Split Sound (QSS) mode (PLL controlled)
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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 I²C-bus
•
AM demodulator without extra reference circuit
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Alignment-free selective FM-PLL demodulator with high linearity and low noise
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I²C-bus control for all functions
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I²C-bus transceiver with pin programmable Module Address (MAD).
GENERAL DESCRIPTION
The TDA9885 is an alignment-free single standard (without positive modulation) vision and sound
IF signal PLL.
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.
Pin No: Name Short Description
1 VIF1 VIF differential input 1
2 VIF2 VIF differential input 2
3 OP1 output 1 (open-collector)
4 FMPLL FM-PLL for loop filter
5 DEEM de-emphasis output for capacitor
6 AFD AF decoupling input for capacitor
7 DGND digital ground
8 AUD audio output
9 TOP tuner AGC TakeOver Point (TOP)
10 SDA I²C-bus data input/output
11 SCL I²C-bus clock input
12
SIOMAD sound intercarrier output and MAD select
13 NC not connected
14 TAGC tuner AGC output
15 REF 4 MHz crystal or reference input
16 VAGC VIF-AGC for capacitor