TDA4855 datasheet(2/44 Pages) PHILIPS

2 / 44 page

1996 Jul 18

Philips Semiconductors

Preliminary speciﬁcation

Autosync Deﬂection Controller (ASDC)

TDA4855

FEATURES

Concept features

• 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.

Synchronization inputs

• Can handle all sync signals (Horizontal, Vertical,

Composite and Sync-on-video)

• Combined output for video clamping, vertical blanking

and protection blanking.

Horizontal section

• Extremely low jitter

• Frequency locked loop for smooth catching of line

frequency

• Simple frequency preset of fmin and fmax by external

resistors

• DC controllable wide range linear picture position

• Soft start for horizontal driver.

Vertical section

• 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.

EW section

• 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.

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.

TDA4855 Datasheet(PDF) 2 Page - NXP Semiconductors

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