Pin Configurations; Lm7808; Description - Toshiba 29VH27E Service Manual

• 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
• 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
• 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
VIF1 1
2
VIF2
3
OP1
FMPLL 4
DEEM 5
6
AFD
DGND 7
8
AUD
TOP 9
10
SDA
SCL 11
12
SIOMAD
n.c 13
TAGC 14
15
REF
16
VAGC
CVBS 17
AGND 18
19
VPLL
VP
20
21
AFC
OP2 22
23
SIF1
SIF2 24

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
2 C-bus or alternatively with potentiometer
Description
VIF differential input 1
VIF differential input 2
output 1 (open-collector)
FM-PLL for loop filter
de-emphasis output for capacitor
AF decoupling input for capacitor
digital ground
audio output
tuner AGC TakeOver Point (TOP)
I 2 C-bus data input/output
I 2 C-bus clock input
sound intercarrier output and MAD select
not connected
tuner AGC output
4 MHz crystal or reference input
VIF-AGC for capacitor (Not connected for TDA9885.)
video output
analog ground
VIF-PLL for loop filter
supply voltage (+5 V)
output
output 2 (open-collector)
differential input 1
differential input 2
23
2 C-bus