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參數(shù)資料
| 型號(hào)： | SDA9589X |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | PIP IV Advanced SOPHISTICUS High-End Picture-In-Picture ICs |
| 中文描述： | 畫(huà)中畫(huà)四先進(jìn)SOPHISTICUS高端畫(huà)中畫(huà)，圖像芯片 |
| 文件頁(yè)數(shù)： | 14/102頁(yè) |
| 文件大小： | 2306K |
| 代理商： | SDA9589X |
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SDA 9489X
SDA 9589X
System Description
Micronas
4-14
Preliminary Data Sheet
by a digital PLL. At SECAM operation the PLL runs free and generates the line-wise
alternating subcarriers. A CORDIC structure demodulates the frequency-modulated UV
signals. The following SECAM de-emphasis filter characteristic is adjustable
(DEEMP)
.
The chroma signal can be filtered before demodulation by means of a selectable IF-
prefilter (
IFCOMP
).
Figure 4-5
SECAM de-emphasis filter characteristic and IF-compensation filter
characteristic
The Hue Control (
HUE
) influences the phase of the demodulation subcarrier between
-44.8° and 43.4° in steps of 1.4°. This is provided for NTSC only and adjustment is
ineffective for PAL and SECAM signals.
The reference for the subcarrier generation is a crystal stable clock of 20.25000 MHz. In
order to avoid color standard detection problems, the maximum deviation of this
frequency should not exceed 100ppm. For a good PLL locking behavior a maximum
deviation of 40ppm is recommended. A small frequency adjustment (-150 ... +310 ppm)
is possible for using a crystal with small frequency deviations
(SCADJ)
. For test
purposes,
CPLL
allows to open the loop of the chroma PLL.
For deviations in the chroma signal up to 30dB, a stable output amplitude after chroma
decoding is achieved due to the ACC (Automatic Chroma Control). If the chroma signal
(color burst) is below a selectable threshold (
CKILL
), the color will be switched off.
Alternatively the color-killer can be bypassed and the color can be switched on or off
under all conditions (
COLON
). By setting
ACCFIX
, the automatic chroma control is
disabled and set to a default value.
3.58
4.4
2
3
4
5
6
10
7.5
5
2.5
0
2.5
5
frequency [MHz]
g
0
0.5
1
1.5
2
2.5
20
15
10
5
0
frequency [MHz]
g
DEEMP = ’00’
DEEMP = ’01’
DEEMP = ’10’
DEEMP = ’11’
IFCOMP = ’00’
IFCOMP = ’01’
IFCOMP = ’10’
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