? 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 for all
2
negative and positive modulated standards via IC-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-analogue
2
converter; AFC bits via IC -bus readable
2
? TakeOver Point (TOP) adjustable via IC-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
2
performance single reference QSS mode and in intercarrier mode, switchable via IC-bus
? AM demodulator without extra reference circuit
? Alignment-free selective FM-PLL demodulator with high linearity and low noise
2
? IC-bus control for all functions
2
? IC-bus transceiver with pin programmable Module Address (MAD).
12.29.3. Pinning
SYMBOL PIN DESCRIPTION
VIF1 1 VIF differential input 1
VIF2 2 VIF differential input 2
OP1 3 output 1 (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)
2
SDA 10 IC-bus data input/output
SCL 11 I2C-bus clock input
SIOMA 12 sound intercarrier output and MAD select
n.c. 13 not connected
TAGC 14 tuner AGC output
REF 15 4 MHz 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 (+5 V)
AFC 21 AFC output
OP2 22 output 2 (open-collector)
SIF1 23 SIF differential input 1
SIF2 24 SIF differential input 2
33
27? TFT TV Service Manual 10/10/2005 |
ACEC
