Daewoo DDT-21H9ZZF, Service Manual, Page: 26 / 83

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Service Manual CP-099F
4-3 TDA9886 IIC-bus controlled single/multi standard Alignment-free IF-PLL
4-3-1- DISCRIPTION
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.
4-3-2- FEATURES
- 5V 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, excellent pulse response).
- Gated phase detector for L/L accent standard.
- Fully integrated VIF Voltage controlled Oscillator(VCO), alignment-free, frequencies switchable forall negative
and positive modulated standards via I
2
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.
- 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.
- 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
2
C-bus.
- AM demodulator without extra reference circuit.
- alignment-free selective FM-PLL demodulator with high linearity and low noise.
- I
2
C-bus control for all functions.
- I
2
C-bus transceiver with pin programmable Module Address (MAD).
4-3-3 PINNING
SYMBOL PIN DESCRIPTION
VIF1 1 VIF differential input 1
VIF2 2 VIF differential input 2
OP1 3 DVD Reset (open-collector)
FMPLL 4 FM-PLL for loop filter
DEEM 5 de-emphasis output for capacitor
AFD 6 AF decoupling input for capacitor
DGND 7 digital ground
AUD 8 Audio output
TOP 9 Tuner AGC TakeOver point(TOP)
SDA 10 I
2
C-bus data input/output
SCL 11 I 2 C-bus clock input
SLOMAD 12 sound intercarrier output and
MAD select
SYMBOL PIN DESCRIPTION
n.c 13 not connected
TAGC 14 tuner AGC output
REF15 4MHz crystal or reference input
VAGC 16 VIF-AGC for capacitor : note 1
CVBS 17 Video output
AGND 18 analog ground
VPLL 19 VIF-PLL for loop filter
Vp 20 supply voltage (+5V)
AFC 21 AFC output
OP2 22 output 2(open-collector)
SIF1 23 SIF differential input 1
SIF2 24 SIF differential input 2