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GS1574A Folha de dados(PDF) 11 Page - Gennum Corporation |
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GS1574A Folha de dados(HTML) 11 Page - Gennum Corporation |
11 / 16 page GS1574A Data Sheet 33416 - 5 March 2006 11 of 16 4. Detailed Description The GS1574A is a high speed BiCMOS IC designed to equalize serial digital signals. The GS1574A can equalize both HD and SD serial digital signals, and will typically equalize greater than 140m of Belden 1694A cable at 1.485Gb/s and 350m at 270Mb/s. The GS1574A is powered from a single +3.3V power supply and consumes approximately 215mW of power. 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. |
Nº de peça semelhante - GS1574A |
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Descrição semelhante - GS1574A |
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