SDA9362 查看數據表（PDF） - Siemens AG

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SDA9362

DDC-PLUS-Deflection Controller

Siemens AG 

SDA 9362

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.

b) control bits VR1, VR0 = 00 (no reduction of vertical size)

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.

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

∆VVDPP

=

∆VIBEAM

*

V-----e---r--t--i-c---a---l---E----H-----T-----c---o---m-----p----e---n---s---a----t-i--o---n-----+-----1---2----8-

512

*

0,571 )

∆VVDPP:

∆VIBEAM:

variation of VD+ and VD- peak-to-peak voltage

variation of IBEAM input voltage

1) the factor 0.57 depends on VREFP, VREFH, VREFL

If Vertical EHT Compensation = -128 the outputs VD+ and VD- are

independent of the input signal IBEAM.

Horizontal EHT Compensation

This item controls the influence of the input signal IBEAM on the output E/W according

to the following equation:

∆VEW

=

∆VIBEAM

*

H-----o----r--i--z---o----n----t--a---l---E----H-----T-----c---o----m-----p---e---n----s---a---t--i-o---n-----+-----1---2----8-

128

*

2,121 )

∆VEW:

∆VIBEAM:

variation of E/W output voltage

variation of IBEAM input voltage

1) the factor 2.12 depends on VREFP, VREFH, VREFL

If Horizontal EHT Compensation = -128 the output E/W is independent

of the input signal IBEAM.

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

21

1998-02-01

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