Horizontal Deflection Signal Processing - Mitsubishi DPLUS 74SB -BKA Service Manual

3. Horizontal deflection signal processing / Vertical and geometrical compensa-
tion of the raster
I²C-bus autosync deflection controller for PC monitors
FEATURES
Concept features
• Full horizotal plus vertical autosync capability
• Extended horizontal frequency range from 15 to
130kHz
• Comprehensive set of I²C-bus driven geometry
adjustments and functions, including standby
mode
• Very good vertical linearity
• Moire cancellation
• Start-up and switch-off sequence for safe opera-
tion of all power components
• X-ray protection
• Power dip recognition
• Flexible switched mode B+ supply function block
for feedback and feed forward converter
• Internally stabilized voltage reference
• Drive signal for focus amplifiers with combined
horizontal and vertical parabola waveforms
• DC controllable inputs for Extremely High Tension
(EHT) Compensation
• SDIP32 Package
Synchronization
• Can handle all sync signals (horizontal, vertical,
composite and sync-on-video)
• Output for video clamping (leading/trailing edge
selectable by the I²C-bus), vertical blanking and
protection blanking
• Output for fast unlock status of horizontal syn-
chronization and blanking on grid 1 of picture
tube.
Horizontal section
• I²C-bus controllable wide range linear picture
position, pin unbalance and parallelogram
correction via horizontal phase
• Frequency-locked loop for smooth catching of
horizontal frequency
• Simple frequency preset of fmin and fmax by
external resistors
• Low jitter
• Soft start for horizontal and B+ control drive
signals.
Vertical section
• I²C-bus controllable vertical picture size, picture
position, linearity (S-correction) and linearity
balance
• Output for the I²C-bus controllable vertical
sawtooth and parabola (for pin unbalance and
parallelogram)
• Vertical picture size independent of frequency
• Differential current outputs for DC coupling to
vertical booster
• 50 to 160 Hz vertical autosync range.
East-West (EW) section
• I²C-bus controllable output for horizontal pincush-
ion, horizontal size, corner and trapezium correc-
tion
• Optional tracking of EW drive waveform with line
frequency selectable by the I²C-bus.
Focus section
• I²C-bus controllable output for horizontal and
vertical parabolas
• Vertical parabola is independent of frequency and
tracks with vertical adjustments
• Horizontal parabola independent of frequency
• Adjustable pre-correction of delay in focus output
stage.
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TDA4857