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TEA2130STN/a1779avaiTV AND SATELLITE DECODER SCANNING PROCESSOR


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TEA2130
TV AND SATELLITE DECODER SCANNING PROCESSOR
TEA2130
TV AND SATELLITE DECODER SCANNING PROCESSOR
September 1993 AUTOMATIC TIME CONSTANT SWITCHING
FOR VCR. DIGITAL VIDEO IDENTIFICATION CIRCUIT. 500kHz RESONATOR OSCILLATOR. NO LINE AND FRAME OSCILLATOR AD-
JUSTMENT. DUAL PLL FOR LINE DEFLECTION. SUPER SANDCASTLE OUTPUT. AUTOMATIC 50Hz/60Hz STANDARD IDENTI-
FICATION. EXCELLENT INTERLACING CONTROL. FRAME SAFETY INPUT. FRAME SAWTOOTH GENERATOR. FULLY ESD AND LATCH-UP PROTECTED
PIN CONNECTIONS
DESCRIPTION

The TEA2130 is a complete (horizontal and verti-
cal) deflection processor, for TV applications and
all applications which require a flexible, high per-
formance scanning processor (Satellite Decoder,
Video Multimedia).
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BLOCK DIAGRAM
GENERAL DESCRIPTION
Introduction

This integrated circuit uses high density I2L bipolar
technology and combines analog signal process-
ing with digital processing.
Timing signals are obtained from a voltage-control-
led oscillator (VCO) operating at 500kHz by means
of a cheap ceramic resonator. This avoid the fre-
quency adjustment normally required with line and
frame oscillators.
A chain of dividers and appropriate logic circuitry
produces very accurate defined sampling pulses
and the necessary timing signals.
Internal Functions
Horizontal scanning processor Frame scanning processorB class frame output stage using an external
power amplifier with flyback generator Line and frame synchronization separation Dual phase-locked loop horizontal scanning High performance frame and line synchronization
with interlacing control. Supersandcastle generator with reduced burst
gate pulse for 60Hz Automatic 50Hz / 60Hz standard identification Frame saw-tooth generator Digital video identification circuit Very steady free running mode of the line and
frame oscillator when no video is detected. This
allows on screen display without phase Jitter in
research mode of the tuner Automatic VCR mode recognition for time con-
stant switching Frame safety input
WORKING DESCRIPTION
Synchronization Separator

Line synchronization separator is clamped to black
level of input video signal with synchronization
pulse bottom level measurement.
The synchronization pulses are divided centrally
between the black level and the synchronization
pulse bottom level, to improve performance on
video signal in noise conditions.
TEA2130

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Frame Synchronization
Frame synchronization is fully integrated (no exter-
nal capacitor required).
The frame timing identification logic permits auto-
matic adaptation to 50-60Hz standards or non-in-
terlaced video.
An automatic synchronization window width sys-
tem provides: Fast frame capture (7.3ms wide window) Good noise immunity (0.4ms narrow window)
The internal generator starts the discharge of the
sawtooth generator capacitor, so that it is not dis-
turbed by line flyback effects.
Thanks to the logic control, the beginning of the
charge phase does not depend on any disturbing
effect of the line flyback. A 32μs timing is automat-
ically applied on standardized transmissions for
perfect interlacing.
In VCR mode, the discharge time is controlled by
an internal monostable independent of the line
frequency and gives a direct frame synchroniza-
tion.
Horizontal Scanning

The horizontal scanning frequency is obtained from
the 500kHz VCO.
The circuit uses two PLL: The first one controls the frequency The second one controls the relative phase of the
output line pulse and the line flyback signals.
The output pulse has a constant duration of 29μs,
independent of VCC and of any delay in switching-
off the scanning transistor.
Supersandcastle Generator

This output delivers a 3 level synchronization sig-
nal: Burst level Line blanking level Frame blanking level
In the event of vertical scanning failure, the frame
blanking level goes high to protect the tube.
Frame Scanning

The current to charge the frame sawtooth gener-
ator is automatically switched to 60Hz operation to
maintain constant amplitude.
Automatic VCR Mode Recognition for Time
Constant Switching
A third phase comparator is used to detect VCR
signals and to switch the φ1 short time constant.A noise level measurement is realized on the
video synchronization pulse to inhibit the short
time constant if the noise level is superior to an
adjustable threshold. VCR signals are detected if peak to peak signal
on pin 2 is superior to an internal threshold.
This threshold is depending on the noise level. So
with a no noisy video signal, the auto VCR switch
sensitivity is maximum, and it decreases when the
noise increases. The sensitivity of the noise gate and the auto VCR
switch is adjustable by external resistance. Long and short time constants can be selected
manually by Pin 20.
Digital Video Identification
digital circuit controls the identification signal.
When identification signal is low, the line oscillator
is set on a reference frequency. When identification
signal is high, φ1 is locked and the catching phase
can start. So that, the TEA2130 allowed on screen
displays in a steady way even without video signal
(during tuner research for example).
Identification Output

The identification function provides three different
levels : 0V : No video identification 6V : 60Hz video identification 12V : 50Hz video identification
This information may be used for timing research
in the case of frequency or voltage synthetizer type
receivers and for audio muting.
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
TEA2130

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ELECTRICAL CHARACTERISTICS (Tamb = 25o C; VCC = 12V; Pulse duration 50% of the amplitude)
VIDEO INPUT (Pin 19)
50% SYNCH. PULSE CLAMP (Pin 18)
φ 1 AND φ 3 COMPARATOR (Pin 2- Pin 3)
VIDEO IDENTIFICATION AND STANDARD OUTPUT (Pin 7)
REFERENCE VOLTAGE (Pin 1)
AUTO VCR SWITCH (Pin 2)
NOISE GATE (Pin 20)
TEA2130

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ELECTRICAL CHARACTERISTICS (continued)
(Tamb = 25o C; VCC = 12V; Pulse duration 50% of the amplitude)
φ 2 COMPARATOR (Pin 14)
LINE MONOSTABLE (Pin 10)
LINE OUTPUT (Pin 11)
LINE SAW-TOOTH (Pin 8)
LINE FLYBACK INPUT (Pin 13)
SUPER SANDCASTLE GENERATOR (Pin 12)
TEA2130

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ELECTRICAL CHARACTERISTICS (continued)
Tamb = 25o C; VCC = 12V; Pulse duration 50% of the amplitude
FRAME SAW-TOOTH GENERATOR
FRAME LOGIC SYNCH.
CURRENT REFERENCE (Pin 9)
FRAME SAFETY INPUT (Pin 6)
TEA2130

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