23
•
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 I
2
C-bus readable
•
Take Over Point (TOP) adjustable via I
2
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
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).
14.15.3.Pin Configurations
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)
SDA
10
I
2
C-bus data input/output
SCL
11
I
2
C-bus clock input
SIOMAD
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 (Not connected for TDA9885.)
CVBS
17
video output
AGND
18
analog ground
VPLL
19
VIF-PLL for loop filter
VP
20
supply voltage (+5 V)
AFC
21
output
OP2
22
output 2 (open-collector)
SIF1
23
differential input 1
SIF2
24
differential input 2
14.16.LM7808
14.16.1.Description
The L7800 series of three-terminal positive regulators is available in TO -220 TO -220FP TO-3 and D 2
PAK packages and several fixed output voltages, making it useful in a wide range of applications.
These regulators can provide local on-card regulation, eliminating the distribution problems associated
with single point regulation. Each type employs internal current limiting, thermal shutdown and safe
area protection, making it essentially indestructible. If adequate heat sinking is provided, they can
deliver over 1A output current. Although designed primarily as fixed voltage regulators, these devices
can be used with external components to obtain adjustable voltages and currents.
14.16.2.Features
Output Current Up To 1.5 A
Output Voltages of 5; 5.2; 6; 8; 8.5; 9; 12; 15; 18; 24V
Thermal Over load protection
Short Circuit Protection
Output Transition SOA Protection
Содержание 29VH27E
Страница 1: ...SERVICE MANUAL PRINTED IN UK 2003 C COLOURTELEVISION 29VH27E TOSHIBA 050 200332 AK52 Chassis ...
Страница 2: ...SM52 DRX_IF ...
Страница 5: ...iii 16 3 VIDEO ALIGNMENTS 33 16 4 SERVICE ALIGNMENTS 34 17 BLOCK DIAGRAM 36 18 CIRCUIT DIAGRAMS 37 ...
Страница 42: ...37 18 CIRCUIT DIAGRAMS 11ak52e3 VIDEO ...
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Страница 170: ...Cabinet Exploded View N A ...