SDA9362 Infineon Technologies Corporation, SDA9362 Datasheet - Page 21

• Manufacturer Part Number: SDA9362
• Description: Ddc-plus-deflection Controller
• Manufacturer: Infineon Technologies Corporation

b) control bits VR1, VR0 = 00 (no reduction of vertical size)
Vertical EHT Compensation
This item controls the influence of the beam current dependent input signal IBEAM on
the outputs VD+ and VD- according to the following equation
Horizontal EHT Compensation
This item controls the influence of the input signal IBEAM on the output E/W according
to the following equation:
AFC EHT Compensation
Deviation of the horizontal phase caused by high beam current (e.g. white bar) can be
eliminated by this control item. The beam current dependent input signal IBEAM is
multiplied by AFC EHT Compensation.
Semiconductor Group
V
V
V
V
VDPP
IBEAM
EW
IBEAM
overscan). It defines the start of the reduced amplitude (factors 0.5, 0.66, 0.75) of the
vertical sawtooth (refer page 35). When Start Reduced Scan = 0 the reduction
takes place over all lines including vertical flyback.
If Start Reduced Scan > Start Vertical Scan the D/A conversion of the sawtooth
starts (Start Reduced Scan - Start Vertical Scan) lines after begin of the
calculation.
This causes a jump of the output voltage VD+, VD- from flyback to scan level. It may
be useful to hide the automatic cut-off control lines if no overscan is desired (e.g. for
VGA display). If Start Reduced Scan <= Start Vertical Scan this byte has no effect.
:
V
:
:
:
EW
V
VDPP
=
variation of VD+ and VD- peak-to-peak voltage
variation of IBEAM input voltage
1)
If Vertical EHT Compensation = -128 the outputs VD+ and VD- are
independent of the input signal IBEAM.
variation of E/W output voltage
variation of IBEAM input voltage
1)
If Horizontal EHT Compensation = -128 the output E/W is independent
of the input signal IBEAM.
the factor 0.57 depends on
the factor 2.12 depends on
V
=
IBEAM
V
IBEAM
*
Horizontal EHT compensation
-------------------------------------------------------------------------------------------------- - * 2,12
*
Vertical EHT compensation
---------------------------------------------------------------------------------------- - * 0,57
V
128
V
21
REFP
REFP
512
,
,
V
V
REFH
REFH
,
,
V
V
+
REFL
REFL
+
128
128
1
1
SDA 9362
1998-02-01