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TEA2029C Arkusz danych(PDF) 3 Page - STMicroelectronics

Numer części TEA2029C
Szczegółowy opis  COLOR TV SCANNING AND POWER SUPPLY PROCESSOR
Download  9 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TEA2029C Arkusz danych(HTML) 3 Page - STMicroelectronics

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GENERAL DESCRIPTION
This integrated circuit uses I
2L bipolar technology
and combines analog signal processing with digital
processing.
Timing signals are obtained from a voltage-control-
led oscillator (VCO) operatingat 500KHz by means
of a cheap ceramic resonator. This avoids the
frequency adjustment normally required with line
and frame oscillators.
A chain of dividers and appropriate logic circuitry
produce very accurately defined sampling pulses
and the necessary timing signals.
The principal functions implemented are :
- Horizontal scanning processor.
- Frame scanning processor. Two applications are
possible :
- D Class : Po wer stage using an external
thyristor.
- B Class : Power stage using an external power
amplifier with fly-back generator
such as the TDA8170.
- Secondary switch mode power regulation.
The SMPS output synchronize a primary I.C.
(TEA2260/61) at the mains part.
This concept allows ACTIVE STANDBY facilities.
- Dual phase-locked loop horizontal scanning.
- High performance frame and line synchronization
with interlacing control.
- Video identification circuit.
- Super sandcastle.
- AGC key pulse output.
- Automatic 50-60Hz standard identification.
- VCR input for PLL time constant and frame syn-
chro switching.
- Frame saw-tooth generator and phase modula-
tor.
- Switching mode regulated power supply compris-
ing error amplifier and phase modulator.
- Security circuit and start-up processor.
- 500kHz VCO
The circuit is supplied in a 28 pin DIP case.
VCC = 12V.
Synchronization Separator
Line synchronization separator is clamped to
black level of input video signal with synchroniza-
tion 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 signals in noise conditions.
Frame Synchronization
Frame synchronization is fully integrated (no ex-
ternal 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 (6.7ms wide window),
- good noise immunity (0.4ms narrow window).
The internal generator starts the discharge of the
saw-tooth generator capacitor so that it is not dis-
turbed by line fly back effects.
Thanks to the logic control, the beginning of the
charge phase does not depend on any disturbing
effect of the line fly-back.
A32
µs timing is automatically applied on stan-
dardized 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 horizontalscanning frequency is obtainedfrom
the 500kHz VCO.
The circuit uses two phase-locked loops (PLL) :
the first one controls the frequency, the second one
controls the relative phase of the synchronization
and line fly-back signals.
The frequency PLL has two switched time con-
stants to provide :
- capture with a short time constant,
- good noise immunity after capture with a long
time constant.
The output pulse has a constant duration of 26
µs,
independent of VCC and any delay in switching off
the scanning transistor.
Video Identification
The horizontal synchronization signal is sampled
by a 2
µs pulse within the synchronization pulse.
The signal is integrated by an external capacitor.
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.
Super Sandcastle with 3 levels : burst, line fly-
back, frame blanking
In the event of vertical scanning failure, the frame
blanking level goes high to protect the tube.
Frame blanking time (start with reset of Frame
divider) is 24 lines.
VCR Input
This provides for continuous use of the short time
constant of the first phase-locked loop (frequency).
In VCR mode, the frame synchronization window
TEA2029C
3/9


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