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參數(shù)資料
| 型號： | SDA 9257 |
| 廠商： | SIEMENS AG |
| 英文描述： | A Generator Chip as Frequency Synthesizer for TV Applications(應(yīng)用于TV的頻率同步的芯片) |
| 中文描述： | A的頻率合成器發(fā)生器芯片的電視應(yīng)用（應(yīng)用于電視的頻率同步的芯片） |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 224K |
| 代理商： | SDA 9257 |
Application Note
Semiconductor Group
294
SDA 9257: A Generator Chip as Frequency Synthesizer
for TV Applications
Color TV sets with the Siemens Featurebox are notable for their flicker-free picture and convenient
functions such as frame freeze picture-in-picture, 9-in-1 picture and noise reduction. Following
development of the SDA 9205-2 triple A/D converter and SDA 9257 clock sync generator, television
sets with analog processing of the video signal can now enjoy all the advantages of the digital
Featurebox. The SDA 9257 can also be used as a general purpose video pulse generator and
frequency synthesizer.
Using the clock sync generator (CSG), the triple ADC and an analog color decoder (e.g. TDA 4555),
analog TV frontends can now be designed that produce all the picture signals, sync pulses and
clock pulses required by the Featurebox (
figure 1
). The CSG works with all standards for composite
video blanking signals (CVBS), such as 50 Hz, 60 Hz, PAL, NTSC and SECAM, and is optimized
in its clock and sync generation for different TV and VCR sources.
Frequency Synthesizer
Used as a frequency synthesizer, the CSG generates frequencies between approximately 10.3 and
37.7 MHz at its clock outputs. The required frequency can be set in very fine increments by a 16-bit
value on the
I
2
C Bus and can also be crystal-controlled with an external crystal as a reference
(
figure 2
).
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