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GS1574-CNE3 Arkusz danych(PDF) 11 Page - Gennum Corporation |
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GS1574-CNE3 Arkusz danych(HTML) 11 Page - Gennum Corporation |
11 / 18 page GS1574 Data Sheet 28854 - 5 May 2007 11 of 18 4. Detailed Description The GS1574 is a high speed bipolar IC designed to equalize serial digital signals. The GS1574 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 GS1574 is powered from a single +3.3V power supply and consumes approximately 270mW 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. 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. |
Podobny numer części - GS1574-CNE3 |
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Podobny opis - GS1574-CNE3 |
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