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GS2978-CTE3 데이터시트(PDF) 9 Page - Gennum Corporation |
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GS2978-CTE3 데이터시트(HTML) 9 Page - Gennum Corporation |
9 / 15 page GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 9 of 15 4.2.1 Output Amplitude (RSET) The output amplitude of the GS2978 can be adjusted by changing the value of the RSET resistor as shown in Table 4-1. For an 800mVp-p output with a nominal ±7% tolerance, a value of 750Ω is required. A ±1% SMT resistor should be used. The RSET resistor is part of the high speed output circuit of the GS2978. The resistor should be placed as close as possible to the RSET pin. In addition, the PCB capacitance should be minimized at this node by removing the PCB groundplane beneath the RSET resistor and the RSET pin. 4.2.2 Output Disable The serial output disable (DISABLE), disables power to the current mode serial digital output driver. When asserted LOW, the SDO/SDO output driver is powered off. SDO/SDO will float to VCC through the pull-up resistor. NOTE: If the DISABLE pin is left as a No Connect (NC), the SDO/SDO outputs are still active. 4.3 Output Return Loss Measurement To perform a practical return loss measurement, it is necessary to force the GS2978 output to a DC high or low condition. The actual measured return loss will be based on the outputs being static at VCC or VCC-1.6V. Under normal operating conditions the outputs of the device swing between VCC-0.4V and VCC-1.2V. Table 4-1: RSET vs. VOD RSET R (Ω) Output Swing (mVp-p) 995 608 824 734 750 800 680 884 573 1040 NOTE: For reliable operation of the GS2978 over the full temperature range, do not use an RSET value below 573Ω. |
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