TDA9112A View Datasheet(PDF) - STMicroelectronics
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MFG CO.
'TDA9112A' PDF : 60 Pages View PDF
TDA9112A
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
17. 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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