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GS9024 Datasheet(PDF) 6 Page - Gennum Corporation |
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GS9024 Datasheet(HTML) 6 Page - Gennum Corporation |
6 / 8 page GENNUM CORPORATION 521 - 70 - 06 6 Fig. 9 Output Data Waveform at 270Mb/s, 300m Fig. 10 Output Data Waveform at 540Mb/s, 200m DETAILED DESCRIPTION The GS9024 Automatic Cable Equalizer is a bipolar integrated circuit designed to equalize serial digital data signals between 30Mbps and 622Mbps. Powered from a single +5V or -5V supply, the device consumes approximately 240mW of power. The serial data signal is connected to the input pins (SDI/SDI) either differentially or single ended. The input signal passes through a variable gain equalizing stage whose frequency response closely matches the inverse 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 gain stage provides up to 40dB of gain at 200MHz which will typically result in equalization of greater than 350m at 270Mb/s of Belden 8281 cable. 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 an external differential AGC filter capacitor (AGC+/AGC-) 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 DC restored, thereby restoring its logic threshold to its corrective level regardless of shifts due to AC coupling. The digital output signals have PECL voltage levels (800mV) and are available at pins SDO and SDO. 1. OUTPUT HIGH Z A HIGH Z pin allows the data outputs to be put into a high impedance state which disconnects them from the output traces. This feature is ideal for input expansion in router applications as it eliminates the need for input muxes or crosspoints. 2. SIGNAL STRENGTH INDICATION/CARRIER DETECT The GS9024 incorporates an analog signal strength indicator/carrier detect output (SSI/CD) which indicates both the presence of a carrier and the amount of equalization applied to the signal. The voltage output of this pin versus cable length (signal strength) is shown in Figure 11. With 0m of cable (800mV input signal levels), the SSI/CD output voltage is approximately 4.5V. As the cable length increases, the SSI/CD voltage decreases linearly providing accurate correlation between the SSI/CD voltage and cable length. When the signal strength decreases to the level set at the "Carrier Detect Threshold Adjust" pin, the SSI/CD voltage goes to a logic "0" state (0.8V) and can be used to drive other TTL/CMOS compatible logic inputs. In addition, when loss of carrier is detected the SDO/SDO outputs are muted (set to a known static state). |
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