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ML6420CS-1 Datasheet(PDF) 8 Page - Micro Linear Corporation |
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ML6420CS-1 Datasheet(HTML) 8 Page - Micro Linear Corporation |
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8 / 20 page  ML6420 8 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) 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. 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 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. 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. NTSC/PAL: A 5.50MHz cut-off frequency provides good filtering for 4.2MHz, 5.0MHz. 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 27MHz Y/C and CV sampling and 6.75MHz or 13.5MHz U/V sampling. The ML6421 has the same pin-out as the ML6420. 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 RANGE input = 0V, 0.5V £ VIN £ 1.5V; with RANGE input = 5V, 0.0 £ VIN £ 1.0V.) and the ADC. Figure 8 is typically 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. USING VIDEO FILTERS The ML6420 are monolithic, triple/dual lowpass filters intended for input anti-aliasing prior to analog to digital conversion in video systems. |
Similar Part No. - ML6420CS-1 |
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Similar Description - ML6420CS-1 |
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