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TDA4857

I2C-bus autosync deflection controller for PC monitors

Philips Electronics 

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 fmin and fmax 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

2

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