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ML6420CS-1 参数 Datasheet PDF下载

ML6420CS-1图片预览
型号: ML6420CS-1
PDF下载: 下载PDF文件 查看货源
内容描述: 三/双相位均衡,低通滤波器的视频 [Triple/Dual Phase-Equalized, Low-Pass Video Filter]
分类和应用: 有源滤波器光电二极管信息通信管理LTE
文件页数/大小: 20 页 / 273 K
品牌: MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
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ML6420  
RGB: When the bandwidth of each signal is the same,  
then the 5.5MHz or 8.0MHz/9.3MHz are appropriate  
depending on the sampling rate. (13.5MHz vs 27MHz)  
filtering for 4.2MHz, 5.0MHz.  
YUV: When the luminance bandwidth is different from the  
color bandwidth, the ML6420-4 with the 8.0, 3.0 and  
3.0MHz filters are more appropriate.  
Sinx/x: For digital video system with output D/A converters,  
there is a fall-off in response with frequency due to discrete  
sampling. The fall-off follows a sinx/x response. The ML6421  
and ML6423 filters have a complementary boost to provide  
a flatter overall response. The boost is designed for 13.5MHz  
and 27MHzY/C and CV sampling and 6.75MHz or  
13.5MHz U/V sampling. The ML6421 has the same pin-out  
as the ML6420.  
S-Video: For Y/C (S-video) and Y/C + CV (Composite  
Video) systems the ML6420 with 5.5MHz or 8.0MHz  
filters or ML6422 with 5.5MHZ and 9.3MHz filters are  
appropriate. In NTSC the C signal occupies the bandwidth  
from about 2.6MHz to about 4.6MHz, while in PAL the C  
signal occupies the bandwidth from about 3.4MHz to  
about 5.4MHz. In both cases, a 5.5MHz low pass filter  
provides adequate rejection for both sampling and  
reconstruction. In addition, using the same filter for both Y/  
C and CV maintains identical signal timing  
TYPICAL CLAMPING SCHEMES  
Figures 8 and 9 show two typical applications of the  
ML6420 for anti-aliasing prior to A-to-D conversion. In  
Figure 8, a single precision digital feedback clamp circuit  
includes both the ADC and the ML6420. This establishes  
the proper DC operating point for the ML6420 (with  
without adjustments.  
Composite: When one or more composite signals need to  
be filtered, then the 5.50MHz, 8.0MHz, or 9.3MHz filters  
permit filtering of one, two or three composite signals.  
RANGE input = 0V, 0.5V  
V
1.5V; with RANGE input  
IN  
= 5V, 0.0 1.0V.) and the ADC. Figure 8 is typically  
V
IN  
used with ADC’s that require external clamp circuitry.  
Figure 9 shows AC coupled application for ADC’s with  
built-in clamps. In this case, the clamp is internal to the  
ADC and the ML6420 uses a simple coarse clamp at its  
input to establish the proper operating point.  
4X Over sampling: While the ML6420 filters can eliminate  
the need for over sampling combined with digital filtering,  
there are times when over sampling is needed. For these  
situations, 8.0MHz or 9.3MHz is used in place of  
5.5MHz, and 3.0MHz is used in place  
of 1.8MHz.  
USING VIDEO FILTERS  
NTSC/PAL: A 5.50MHz cut-off frequency provides good  
The ML6420 are monolithic, triple/dual lowpass filters  
intended for input anti-aliasing prior to analog to digital  
conversion in video systems.  
8