Philips Semiconductors
Product specification
I
2
C-bus autosync deflection controller for
PC monitors
FEATURES
Concept features
•
Full horizontal plus vertical autosync capability
•
Extended horizontal frequency range from
15 to 130 kHz
•
Comprehensive set of I
2
C-bus driven geometry
adjustments and functions, including standby mode
•
Very good vertical linearity
•
Moire cancellation
•
Start-up and switch-off sequence for safe operation 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 I
2
C-bus), vertical blanking and protection
blanking
•
Output for fast unlock status of horizontal
synchronization and blanking on grid 1 of picture tube.
Horizontal section
•
I
2
C-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 f
min
and f
max
by external
resistors
•
Low jitter
•
Soft start for horizontal and B+ control drive signals.
Vertical section
TDA4841PS
•
I
2
C-bus controllable vertical picture size, picture
position, linearity (S-correction) and linearity balance
•
Output for I
2
C-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
•
I
2
C-bus controllable output for horizontal pincushion,
horizontal size, corner and trapezium correction
•
Optional tracking of EW drive waveform with line
frequency selectable by I
2
C-bus.
Focus section
•
I
2
C-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.
1999 Oct 25
2
PHILIPS [ NXP SEMICONDUCTORS ]
