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参数资料
| 型号： | DDP3315CQA |
| 厂商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封装： | PLASTIC, QFP-80 |
| 文件页数： | 11/62页 |
| 文件大小： | 1746K |
| 代理商： | DDP3315CQA |
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ADVANCE INFORMATION
Micronas
19
2.3.5. Vertical and East/West Deflection
The calculations of the Vertical deflection and East/
West correction waveforms are done in the internal
processor. They are described as polynomials in x,
where x varies from
0.5zoom to +0.5zoom for one
field. For zoom>1, the range is limited between
0.5
and +0.5.
The vertical deflection waveform is calculated as fol-
lows (without EHT compensation):
– VPOS
defines the vertical raster position
– AMPL
is the vertical raster amplitude
(zoom
≥ 1)
– LIN
is the linearity coefficient
– SCOR
is the coefficient for S-correction
– OFFSET is an internal parameter
The vertical sawtooth signal will be generated from a
differential current D/A converter and can drive a DC
coupled power stage. In order to get a faster vertical
retrace timing, the output current of the vertical D/A-
converter can be increased during the retrace for a
programmable number of lines (FLYBL). The range
between the end of the flyback and the beginning of
the raster is also programmable (HOLDL).
The East/West deflection waveform, generated from a
single ended D/A converter, is given with the equation:
– WIDTH
is a DC value for the picture width
– TRAPEZ is the trapezoidal correction
– CUSH
is the pincushion correction
– CORNU is the upper corner correction
– CORNL
is the lower corner correction
Fig. 2–16: Vertical and East/West deflection
waveforms
2.3.6. Vertical Zoom
With vertical zoom the DDP 3315C is able to display
different aspect ratios of the source signal on tubes
with 4:3 or 16:9 aspect ratio by adapting the corre-
sponding raster.
Fig. 2–17: Vertical zoom
V
vpos
ampl x
lin x
2
offset
–
() scor x x
2
offset
–
()
++
()
+
=
EW
width
trapez x
cush x
2
corner x
4
+
+
+
=
-0.5
-0.3
-0.1
0.1
0.3
0.5
-0.5
-0.3
-0.1
0.1
0.3
0.5
V
e
rt
ic
al
amp
lit
ude
E/W
am
pli
tud
e
0.5
0.3
0.1
0.3
0.5
0.3
0.1
0.3
0.5
x
1
0.75
0.5
0.25
0
0.25
0.5
0.75
1
0.75
0.5
0.25
0
0.25
0.5
0.75
1
Stop
Start
vertical
sawtooth
East/West
parabola
zoom
normal
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