TDA4856 데이터 시트보기 (PDF) - Philips Electronics

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TDA4856

I2C-bus autosync deflection controller for PC monitors

Philips Electronics 

Philips Semiconductors

I2C-bus autosync deflection controller for

PC monitors

Product specification

TDA4856

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

• Power dip recognition

• Flexible switched mode B+ supply function block for

feedback and feed forward converter

• Internally stabilized voltage reference

• Drive signal for focus amplifiers with combined

horizontal and 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.

Vertical section

• I2C-bus controllable vertical picture size, picture

position, linearity (S-correction) and linearity balance

• 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 horizontal and vertical

parabolas

• Vertical parabola is independent of frequency and tracks

with vertical adjustments

• Horizontal parabola independent of frequency

• Adjustable pre-correction of delay in focus output stage.

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.

2003 Sep 30

2

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