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GS2988 데이터시트(PDF) 9 Page - Gennum Corporation |
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GS2988 데이터시트(HTML) 9 Page - Gennum Corporation |
9 / 17 page GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 9 of 17 4. Detailed Description 4.1 Serial Data Input The GS2988 features a differential input buffer with on-chip 100Ω differential termination. The serial data input signal is connected to the DDI and DDI input pins of the device. Input signals can be single-ended or differential, DC or AC-coupled. The serial data input buffer is capable of operation with any binary coded signal that meets the input signal level requirements, in the range of 270Mb/s to at least 2.97Gb/s. The input circuit is self-biasing to allow for simple AC or DC-coupling of input signals to the device. 4.2 Input Trace-equalization The GS2988 features fixed trace-equalization to compensate for PCB trace dielectric losses. NOTE: This feature is not available in SD mode, and therefore trace-equalization must be disabled when operating in this mode. The trace-equalization has two settings, OFF and ON. ON invokes a typical 3dB gain value at 1.5GHz. This value is optimized for compensating the high-frequency losses associated with approximately 10 inches of 5-mil stripline in FR4 material. 4.3 Serial Data Output The GS2988 features a current-mode differential output driver capable of driving up to 1800mVpp single-ended into a 1m length of 75Ω cable terminated at both ends. The output signal amplitude or swing is user configurable using an external RSET resistor. The SDO/SDO pin of the device provide the serial data outputs. 4.3.1 Slew Rate Selection (Rise/Fall Time Requirement) The GS2988 supports two user-selectable output slew rates. Control of the slew rate is determined by the setting of the SD/HD input pin. Table 4-1: Input Trace-Equalization EQ_EN Function 0 Typical 3dB Trace Equalization 1Trace Equalization OFF Floating Trace Equalization OFF |
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