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參數(shù)資料
| 型號： | TDA9160 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | PAL/NTSC/SECAM decoder/sync processor(PAL/NTSC/SECAM譯碼器/ 同步處理器) |
| 中文描述： | COLOR SIGNAL DECODER, PDIP32 |
| 封裝： | 0.400 INCH, PLASTIC, SDIP-32 |
| 文件頁數(shù)： | 24/27頁 |
| 文件大?。?/td> | 220K |
| 代理商： | TDA9160 |
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December 1991
24
Philips Semiconductors
Preliminary specification
PAL/NTSC/SECAM decoder/sync processor
TDA9160
Adjustment of geometry control
parameters
The deflection processor of the
TDA9160 offers nine control
parameters for picture alignment:
S-correction, vertical amplitude,
vertical slope and vertical shift for
the vertical picture alignment
Horizontal shift, EW width, EW
parabola/width, EW
corner/parabola and EW trapezium
correction for the horizontal picture
alignment
The required values for the settings of
S-correction, EW parabola/width ratio
and EW corner/parabola ratio are
determined for a particular
combination of picture tube type,
vertical output stage and EW output
stage. These parameters can be
preset via the I
2
C-bus and do not
require any additional adjustment.
The remainder of the parameters are
preset to the mid value of their control
range (i.e. 1F), or to values that have
obtained from previous TV set
adjustments.
After the vertical S-correction has
been preset the vertical picture
alignment could, in theory, be
completed by positioning the top of
the picture using the vertical
amplitude adjustment and the bottom
of the picture using the vertical slope
adjustment (see note). It can be
shown, however, that without
compensation offsets in the external
vertical output stage or in the picture
tube would result in a certain linearity
error especially with picture tubes that
need large S-correction. The total
linearity error is in first order
approximation proportional to the
offset and to the square of the
required S-correction. A vertical shift
control is available for offset
compensation.
For adjustment of the vertical shift,
independent of the vertical slope, a
special vertical shift alignment is
provided. This mode is entered by
setting the SBL bit HIGH. In this mode
the
(R-Y) and
(B-Y) outputs are
blanked during the second half of the
picture. The first line in which the
colours are blanked must be
positioned in the middle of the screen.
The necessity to use the vertical shift
alignment depends on the expected
offsets in the vertical output stage and
picture tube, on the required value of
the S-correction and on the demands
upon the vertical linearity. If the
vertical shift alignment is not used
VSH should be set to its mid value
(i.e. VSH = 1F).
The actual factory adjustments of the
picture consist of the following steps:
The vertical shift is adjusted as
previously described (if required).
The top of the picture is positioned
by adjusting the vertical amplitude
and the bottom of the picture by
adjusting the vertical slope
The picture is positioned in the
horizontal direction by adjusting the
EW width and horizontal shift
The left and right hand sides of the
picture are aligned in parallel by
adjusting the EW trapezium
correction (if required).
Note
The value of the vertical slope
determines the charge current of the
vertical sawtooth capacitor (C
saw
as
shown in Fig.8) and thus the
amplitude of the sawtooth voltage at
pin 11. This voltage serves as the
input voltage for the geometry
processor. Consequently the setting
of the vertical slope will affect both the
vertical and EW output currents.
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