tda4855 NXP Semiconductors, tda4855 Datasheet - Page 2

• Manufacturer Part Number: tda4855
• Description: Autosync Deflection Controller Asdc
• Manufacturer: NXP Semiconductors

Philips Semiconductors
FEATURES
Concept features
Synchronization inputs
Horizontal section
1996 Jul 18
Full Horizontal (H) plus Vertical (V) autosync capability
Completely DC controllable for analog and digital
concepts
Excellent geometry control functions (e.g. automatic
correction of East-West (EW) parabola during
adjustment of vertical size and vertical shift)
Flexible Switched Mode Power Supply (SMPS) function
block for feedback and feed forward converters
Horizontal focus parabola with amplitude control
X-ray protection
Start-up and switch-off sequence for safe operation of
all power components
Very good vertical linearity
Internal supply voltage stabilization
SDIP32 package.
Can handle all sync signals (Horizontal, Vertical,
Composite and Sync-on-video)
Combined output for video clamping, vertical blanking
and protection blanking.
Extremely low jitter
Frequency locked loop for smooth catching of line
frequency
Simple frequency preset of f
resistors
DC controllable wide range linear picture position
Soft start for horizontal driver.
Autosync Deflection Controller (ASDC)
min
and f
max
by external
2
Vertical section
EW section
GENERAL DESCRIPTION
The TDA4855 is a high performance and efficient solution
for autosync monitors. The concept is fully DC controllable
and can be used in applications with a microcontroller and
stand-alone in rock bottom solutions.
The TDA4855 provides synchronization processing, H + V
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 TDA486X and TDA8351.
The TDA4855 provides extended functions e.g. as a
flexible SMPS block and an extensive set of geometry
control facilities, providing excellent picture quality.
Together with the Philips TDA488X video processor family
a very advanced system solution is offered.
Vertical amplitude independent of frequency
Automatic correction of picture height for VGA350 and
VGA400 modes
DC controllable picture height, picture position and
S-correction
Differential current outputs for DC coupling to vertical
booster.
Output for DC adjustable EW parabola with smoothed
top
DC controllable picture width and trapezium correction
Optional tracking of EW parabola with line frequency
Prepared for additional DC controls of vertical linearity,
EW-corner, EW pin balance, EW parallelogram, vertical
focus by extended application.
Preliminary specification
TDA4855