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GS1679-INTE3 데이터시트(PDF) 7 Page - Gennum Corporation |
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GS1679-INTE3 데이터시트(HTML) 7 Page - Gennum Corporation |
7 / 16 page GS1679 Cable Driver with HD/SD Capability Data Sheet 54175 - 1 March 2011 7 of 16 3. Detailed Description Figure 3-1: GS1679 Functional Block Diagram 3.1 Serial Data Input The GS1679 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 digital 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 1.485Gb/s. The input circuit is self-biasing to allow for simple AC or DC-coupling of input signals to the device. 3.2 Serial Digital Output The GS1679 features dual current-mode differential output drivers capable of driving up to 1200mVpp 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 SDO1/SDO1 and SDO2/SDO2 pins of the device provide the serial digital outputs. 3.2.1 Slew Rate Selection (Rise/Fall Time Requirement) The GS1679 supports two user-selectable output slew rates. Control of the slew rate is determined by the setting of the SD/HD input pin. DDI DDI RSET SDO1 SDO1 SDO2 SDO2 DISABLE2 DISABLE1 Band Gap Reference & Output Control Slew Rate Control SD/HD |
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