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LM1270NA Arkusz danych(PDF) 4 Page - National Semiconductor (TI) |
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LM1270NA Arkusz danych(HTML) 4 Page - National Semiconductor (TI) |
4 / 27 page External Interface Signals Electrical Characteristics (Continued) Note 15: Limits met by matching the external resistor going to pin 24 to the H Flyback voltage. Typical Performance Characteristics V CC = 5V, TA = 25˚C unless otherwise specified. Emphasis, Center Frequency at Maximum Center Frequency, Emphasis at Maximum 20063502 20063503 The above two plots show the processing done by the LM1270 on the video input signal. There are two variables for the video processing, emphasis and center frequency. Emphasis is controlled by bits 0-2 in register 0B. This gives 8 different levels of emphasis. In the above plot the center frequency is set at its maximum level and the 8 different levels of emphasis is measured. The output video with no emphasis is adjusted to a 0.7 V P-P level. Using maximum emphasis the video is increased to a 0.9 V P-P level at the rising edge of the video. If the falling edge was measured it would show a similar waveform, but going in the negative direction. Center frequency is shown in the second plot. Control of the center frequency is done with bits 0-3 in register 0C. This gives 16 adjustments for this feature. Every other adjustment is shown in the above plot, showing all 16 adjustments would have made the plot too hard to read. The curves closely approximate the peaking of an RC network, therefore the term center frequency means the RC time constant that is approximated by each curve in the above plot. A true RC peaking network would give very large overshoots. The LM1270 has special circuitry to clip the very large over- shoots, yet has the complete benefit of the RC peaking. This special circuitry allows for much more overshoot than one could do with RC peaking and still not saturate the video channel. Note that the video channel with the emphasis also has its own independent contrast control. This allows the user to adjust his monitor for a brighter picture within the Hi-Brite window and optimize the emphasis for the resolution he is using with the monitor. Now the user of the monitor can give his pictures or video a special “sparkle” when using the capabilities of the LM1270. www.national.com 4 |
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