TDA4857PS Datasheet, PDF (2/56 Pages) NXP Semiconductors – I2C-bus autosync deflection controller for PC monitors

Philips Semiconductors
I²C-bus autosync deflection controller for
PC monitors
Product specification
TDA4857PS
FEATURES
Concept features
• Full horizontal plus vertical autosync capability
• Extended horizontal frequency range from
15 to 130 kHz
• 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 operation of
all power components
• X-ray protection
• Flexible switched mode B+ supply function block for
feedback and feed forward converter
• Internally stabilized voltage reference
• Drive signal for focus amplifier with 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 I²C-bus), vertical blanking and protection
blanking
• Output for fast unlock status of horizontal
synchronization 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 f_min and f_max by external
resistors
• Low jitter
• Soft start for horizontal and B+ control drive signals.
• Output for 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 pincushion,
horizontal size, corner and trapezium correction
• Optional tracking of EW drive waveform with line
frequency selectable by I²C-bus.
Focus section
• I²C-bus controllable output for vertical parabola
• Vertical parabola is independent of frequency and tracks
with vertical adjustments.
GENERAL DESCRIPTION
The TDA4857PS is a high performance and efficient
solution for autosync monitors. All functions are
controllable by the I²C-bus.
The TDA4857PS provides synchronization processing,
horizontal and vertical synchronization with full autosync
capability and very short settling times after mode
changes. External power components are given a great
deal of protection. The IC generates the drive waveforms
for DC-coupled vertical boosters such as the TDA486x
and TDA835x.
The TDA4857PS provides extended functions e.g. as a
flexible B+ control, an extensive set of geometry control
facilities and an output for vertical focus signals.
Together with the I²C-bus driven Philips TDA488x video
processor family, a very advanced system solution is
offered.
Vertical section
• I²C-bus controllable vertical picture size, picture
position, linearity (S-correction) and linearity balance
2000 Jan 31
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