Philips Semiconductors
Product specification
Economy Autosync Deflection Controller
(EASDC)
TDA4858
FEATURES
Vertical section
• Vertical amplitude independent of frequency
Concept features
• DC controllable picture height, picture position and
S-correction
• Full Horizontal (H) plus Vertical (V) autosync capability
• Completely DC controllable for analog and digital
concepts
• Differential current outputs for DC coupling to vertical
booster.
• Excellent geometry control functions [e.g. automatic
correction of East-West (EW) parabola during
adjustment of vertical size and vertical shift]
EW section
• Output for DC adjustable EW parabola
• Flexible Switched Mode Power Supply (SMPS) function
block for feedback and feed forward converters
• DC controllable picture width and trapezium correction
• Optional tracking of EW parabola with line frequency
• X-ray protection
• Start-up and switch-off sequence for safe operation of
all power components
• Prepared for additional DC controls of vertical linearity,
EW-corner, EW pin balance, EW parallelogram, vertical
focus by extended application.
• Very good vertical linearity
• Internal supply voltage stabilization
• SDIP32 package.
GENERAL DESCRIPTION
The TDA4858 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.
Synchronization inputs
• Can handle all sync signals (horizontal, vertical,
composite and sync-on-video)
The TDA4858 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.
• Combined output for video clamping, vertical blanking
and protection blanking
• Start of video clamping pulses externally selectable.
Horizontal section
• Extremely low jitter
The TDA4858 provides extended functions e.g. as a
flexible SMPS block and an extensive set of geometry
control facilities, providing excellent picture quality.
• Frequency locked loop for smooth catching of line
frequency
• Simple frequency preset of fmin and fmax by external
resistors
Together with the Philips TDA488x video processor family
a very advanced system solution is offered.
• DC controllable wide range linear picture position
• Soft start for horizontal driver.
ORDERING INFORMATION
TYPE
PACKAGE
NUMBER
NAME
DESCRIPTION
plastic shrink dual in-line package; 32 leads (400 mil)
VERSION
TDA4858
SDIP32
SOT232-1
1997 Oct 27
2
NXP [ NXP ]
