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GS9024C-CKB 데이터시트(PDF) 6 Page - Gennum Corporation |
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GS9024C-CKB 데이터시트(HTML) 6 Page - Gennum Corporation |
6 / 8 page GENNUM CORPORATION 20581 - 0 6 Fig. 9 Output Data Waveform at 270Mb/s, 300m DETAILED DESCRIPTION DETAILED DESCRIPTION DETAILED DESCRIPTION DETAILED DESCRIPTION The GS9024C Automatic Cable Equalizer is a bipolar integrated circuit designed to equalize serial digital data signals between 30Mbps and 360Mbps. 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 GS9024C 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 10. 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). Fig. 10 3. CARRIER DETECT THRESHOLD ADJUST The threshold level at which loss of carrier is detected is adjustable via external resistors at the CD_ADJ pin. The control voltage at the CD_ADJ pin is set by a simple resistor divider circuit. The threshold level is adjustable from 200m to 350m. By default (no external resistors), the threshold is typically 320m. Connecting this pin to Ground disables the SDO/SDO muting function and allows for maximum possible cable length equalization. This feature is designed for use in applications such as routers where signal crosstalk and circuit noise cause the equalizer to output erroneous data when no input signal is present. This problem is not solved by using a 0 1 2 3 4 5 50 100 150 200 250 300 350 400 450 500 CABLE LENGTH (m) 0 CD_ADJ CONTROL RANGE |
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