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TDA956XPS 데이터시트(PDF) 2 Page - NXP Semiconductors

부품명 TDA956XPS
상세설명  TV signal processor-Teletext decoder with embedded m-Controller
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

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2000 Jun 22
2
Philips Semiconductors
Tentative Device Specification
TV signal processor-Teletext decoder
with embedded
µ-Controller
TDA955X/6X/8X PS/N1 series
GENERAL DESCRIPTION
The various versions of the TDA955X/6X/8X PS/N1 series
combine the functions of a video processor together with a
µ-Controller and US Closed Caption decoder. Several
versions have a Teletext decoder on board. The Teletext
decoder has an internal RAM memory for 1or 10 page text.
The ICs are intended to be used in economy television
receivers with 90
° and 110° picture tubes.
The ICs have supply voltages of 8 V and 3.3 V and they
are mounted in an S-DIP 64 envelope.
The features are given in the following feature list. The
differences between the various ICs are given in the table
on page 4.
FEATURES
TV-signal processor
• Multi-standard vision IF circuit with alignment-free PLL
demodulator
• Internal (switchable) time-constant for the IF-AGC circuit
• A choice can be made between versions with mono
intercarrier sound FM demodulator and versions with
QSS IF amplifier. In the QSS versions without
East-West output an AM/FM mode can be activated. In
that case both the QSS amplifier (for AM demodulation)
and the FM demodulator are available.
• The mono intercarrier sound circuit has a selective
FM-PLL demodulator which can be switched to the
different FM sound frequencies (4.5/5.5/6.0/6.5 MHz).
The quality of this system is such that the external
band-pass filters can be omitted.
• The FM-PLL demodulator can be set to centre
frequencies of 4.74/5.74 MHz so that a second sound
channel can be demodulated. In such an application it is
necessary that an external bandpass filter is inserted.
• The QSS amplifier and mono intercarrier sound circuit of
some versions can be used for the demodulation of FM
radio signals
• Source selection between the ‘internal’ CVBS and one
external CVBS or Y/C signal
• Integrated chrominance trap circuit
• Integrated luminance delay line with adjustable delay
time
• Picture improvement features with peaking (with
switchable centre frequency, depeaking, variable
positive/negative overshoot ratio and video dependent
coring) and blue- and black stretching
• Integrated chroma band-pass filter with switchable
centre frequency
• Only one reference (12 MHz) crystal required for the
µ-Controller, Teletext- and the colour decoder
• PAL/NTSC or multi-standard colour decoder with
automatic search system
• Internal base-band delay line
• Indication of the Signal-to-Noise ratio of the incoming
CVBS signal
• RGB control circuit with ‘Continuous Cathode
Calibration’, white point and black level off-set
adjustment so that the colour temperature of the dark
and the light parts of the screen can be chosen
independently.
• A linear RGB/YUV/YPBPR input with fast blanking for
external RGB/YUV sources. The synchronisation circuit
can be connected to the incoming Y signal. The
Text/OSD signals are internally supplied from the
µ-Controller/Teletext decoder.
• Contrast reduction possibility during mixed-mode of
OSD and Text signals
• Adjustable ‘wide blanking’ of the RGB outputs
• Horizontal synchronization with two control loops and
alignment-free horizontal oscillator
• Vertical count-down circuit
• Vertical driver optimized for DC-coupled vertical output
stages
• Horizontal and vertical geometry processing
• Horizontal and vertical zoom function for 16 : 9
applications
• Horizontal parallelogram and bow correction for large
screen picture tubes
• Low-power start-up of the horizontal drive circuit


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