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GS1524A bảng dữ liệu(PDF) 11 Page - Gennum Corporation |
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GS1524A bảng dữ liệu(HTML) 11 Page - Gennum Corporation |
11 / 16 page GS1524A Adaptive Cable Equalizer Data Sheet 28852 - 5 June 2009 11 of 16 4.1 Serial Digital Inputs The serial data signal may be connected to the input pins (SDI/SDI) in either a differential or single ended configuration. AC coupling of the inputs is recommended, as the SDI and SDI inputs are internally biased at approximately 1.8V. 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. The digital output signals have a nominal voltage of 750mVpp differential, or 375mVpp single ended when terminated with 50Ω as shown in Figure 4-1. Figure 4-1: Typical Output Voltage Levels 4.3 Programmable Mute Output and Cable Length Indicator For SMPTE 259M inputs, the GS1524A incorporates a programmable threshold output mute (MCLADJ) and an analog cable length indicator (CLI). 50 50 SDO SDO +187.5mV -187.5mV VCM = 2.925V typical +187.5mV -187.5mV VCM = 2.925V typical |
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Mô tả tương tự - GS1524A |
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