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GENERAL DESCRIPTION
16.1.1.
The TDA 8885 is I² C-bus controlled singlechip TV processor, which is intended to be applied in PAL/NTSC
and multi-standard television receivers. IC contains integrated sound band-pass trap circuits, a switchable
group delay correction circuit and a multi-standard colour decoder which needs only one (12 MHz)
reference crystal for all standards.
Furthermore various picture improvement features have been included.
FEATURES
16.1.2.
• Multi-standard vision IF circuit with an alignment-free PLL demodulator without external components
• Internal (switchable) time-constant for the IF-AGC circuit
• Switchable sound trap and group delay correction circuit for the demodulated CVBS signal
• Flexible source selection with CVBS switch and a Y (CVBS)/C input so that a comb filter can be
applied
• Integrated chrominance trap circuit
• Integrated luminance delay line with adjustable delay time
• Integrated chroma band-pass filter with switchable centre frequency
• Colour decoder which needs only one 12 MHz reference crystal (or external clock signal) for all
standards
• Blanking of the ' helper signals' for PAL
• Several picture improvement features.
• Internal base-band delay line
• Linear RGB input and fast blanking
• RGB control circuit with ' Continuous Cathode Calibration' , white point and black level offset
adjustment so that the colour temperature of the dark and the light parts of the screen can be chosen
independently.
• Adjustable peak white limiting circuit
• Possibility to insert a ' blue back' option when no video signal is available
• Horizontal synchronisation with two control loops and alignment-free horizontal oscillator
• Vertical count-down circuit
• Vertical driver optimised for DC-coupled vertical output stages for improved geometry
• Vertical geometry processing.
• Low-power start-up for the horizontal drive circuit
• I²C-bus control of various functions
• QSS sound IF amplifier
•
AM sound demodulator
•
PAL decoder
•
SECAM decoder
•
NTSC decoder
•
Additional RGB input
•
Black stretch and Blue stretch
•
Dynamic skin tone control and coring on complete video signal
•
Video dependent coring and Colour Transient Improvement
•
White stretch and green enhancement
•
Horizontal geometry (EW)
•
Horizontal and vertical zoom
•
Horizontal parallelogram and angle correction
•
2
CVBS output
nd
•
Additional YUV/ RGB input with saturation control
•
2 (I²C- bus controlled) switch outputs, which can be used to switch external circuits
and EDTV-2
PLUS
15
- Quick Links:
- Colour Television
- Introduction
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