TDA9112 datasheet(36/51 Pages) STMICROELECTRONICS

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TDA9112

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Figure 13. EWOut output waveforms

9.6 - DYNAMIC CORRECTION

OUTPUTS SECTION

9.6.1 - Composite horizontal and vertical

dynamic correction output HVDyCor

A composite waveform is output on pin HVDyCor.

It consists of a parabola of vertical deflection fre-

quency, on which a parabola of horizontal deflec-

tion frequency is superimposed. The two parabolic

components can independently be adjusted via

I2C bus, the vertical parabola in amplitude (

HVDC-

VAMP I2C bus control), the horizontal parabola in

amplitude and phase (

HVDC-HAMP and HVDC-

HSYM I2C bus controls). See also I2C BUS CON-

TROL REGISTER MAP chapter. The influence of

the vertical component can be nullified by adjust-

ing its control to minimum. The minimum value in

horizontal parabola amplitude I2C bus control

does not correspond to null horizontal amplitude.

Refer to Figure 14. The phase of the horizontal pa-

rabola can roughly be adjusted via

HDyCorPh I2C

bus bit to coincide either with the beginning or the

middle of the H-flyback pulse. Moreover, its centre

can be offset via

HVDC-HSYM I2C bus control.

There is a flat part of a quasi-constant length at the

beginning of the horizontal parabola. Refer to elec-

trical specifications for values.

As the vertical parabola component is generated

from the output vertical deflection drive waveform

(see Figure 12), it tracks with real vertical ampli-

tude and position (including breathing compensa-

tion). It is also affected by C- and S-corrections.

The horizontal parabola component tracks with

value in

HSIZE control and is horizontal breathing

compensated if

HDyCorTr I2C bit is set to 1 (0 by

default).

9.6.2 - Vertical dynamic correction output

VDyCor

A parabola at vertical deflection frequency is avail-

able on pin VDyCor. Its amplitude is adjustable via

VDC-AMP I2C bus control and polarity controlled

via VDyCorPol I2C bus bit. It tracks with real vertical

amplitude and position (including breathing com-

Keystone

PCC

Top

Bott om

Corners

Vertical sawtooth

alone

tVR

V(VCap)

TVR

V(EWOut)

alone

VEW-PCC

VEW-TCor

VEW-BCor

VEW-Key

VEW-DC

V(HEHT)

VRefO

VHEHT(min)

HSIZE (I2C)

min

med

ium

maxim

VEW(min)

VEW(max)

Vertical sawtooth

tVR

V(VCap)

TVR

VRefO

VHEHT(min)

Breathing

compensation

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