TDA9112A datasheet(46/60 Pages) STMICROELECTRONICS

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TDA9112A

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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,

phase

and

shape

(

HVDC-HAMP,

HVDC-HPH and HVDC-HSHAP I²C-bus controls).

See also Chapter 8 - page 27 chapter. The influence

of the vertical component can be nullified by ad-

justing its control to minimum. For horizontal

waveform component, refer to Figure 16 and Figure

. The minimum value in

HVDC-HAMP I²C-bus

control does not correspond to null horizontal am-

plitude. The phase of the horizontal parabola can

roughly be adjusted via HDyCorPh I²C-bus bit for

the waveform’s start to coincide either with the be-

ginning or the middle of the H-flyback pulse. More-

over, its centre can be offset via

HVDC-HPH I²C-

bus control. The shape of the horizontal parabola

can be adjusted via

HVDC-HSHAP I²C-bus control

from a power-of-two to about a power-of-four. Be-

tween the waves of two subsequent lines, a flat is

inserted at level corresponding to the beginning of

the new wave. Putting HDCFlatEn and HDyCorPh

to “1” will cause the flat part to begin at start of H-

flyback and end a delay after its middle. Only this

delay (its duration is quasi-constant) is applied

when HDCFlatEn is at “0”. Refer to electrical spec-

ifications for values.

The horizontal parabola component tracks with

value in

HSIZE control provided that HDyCorTr I²C

bit is set to 1 (0 by default).

As the vertical parabola component is generated

from the output vertical deflection drive waveform,

it tracks with real vertical amplitude and position. It

is not affected by C- and S-corrections or vertical

breathing compensation. It does not track with

Vertical size after-gain (Sad1Dh) nor with Vertical

position offset (Sad1Eh) adjustments.

The polarity of the HVDyCor output can be adjusted

via HVDyCorPol I²C-bus bit.

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 verti-

cal amplitude and position. It is not affected by C-

and S-corrections or breathing compensation. It

does not track with

Vertical size after-gain

(Sad1Dh)

nor

with

Vertical

position

offset

(Sad1Eh) adjustments.

The use of both correction waveforms is up to the

application (e.g. dynamic focus, dynamic bright-

ness control).

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