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GS2984 数据表(PDF) 11 Page - Gennum Corporation |
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GS2984 数据表(HTML) 11 Page - Gennum Corporation |
11 / 20 page GS2984 Adaptive Cable Equalizer Data Sheet 50985 - 3 March 2010 11 of 20 4.2 Cable Equalization The input signal passes through a variable gain equalizing stage, whose frequency response closely matches the inverse of the cable loss characteristic. In addition, the variation of the frequency response with control voltage imitates the variation of the inverse cable loss characteristic with cable length. The edge energy of the equalized signal is monitored by a detector circuit which produces an error signal corresponding to the difference between the desired edge energy and the actual edge energy. This error signal is integrated by both an internal and an external AGC filter capacitor providing a steady control voltage for the gain stage. As the frequency response of the gain stage is automatically varied by the application of negative feedback, the edge energy of the equalized signal is kept at a constant level which is representative of the original edge energy at the transmitter. The equalized signal is also DC restored, effectively restoring the logic threshold of the equalized signal to its correct level independent of shifts due to AC coupling. 4.3 Serial Digital Outputs The digital output signals have a nominal voltage of 800mVpp differential, or 400mVpp single-ended when terminated with 50Ω as shown in Figure 4-1. Figure 4-1: Typical Output Voltage Levels (for 3.3V Common Mode) 50 50 SDO SDO +200mV -200mV VCM = 2.9V typical +200mV -200mV VCM = 2.9V typical |
类似零件编号 - GS2984 |
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类似说明 - GS2984 |
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