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GS2988-INE3 Arkusz danych(PDF) 11 Page - Gennum Corporation |
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GS2988-INE3 Arkusz danych(HTML) 11 Page - Gennum Corporation |
11 / 17 page GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 11 of 17 The RSET resistor is part of an internal DC feedback loop in the GS2988. The resistor should be placed as close as possible to the RSET pin, and connected directly to the VCC plane (traces/wires may cause instability). In addition, the PCB capacitance should be minimized at this node by removing the PCB groundplane beneath the RSET resistor and the RSET pin. NOTE: Care should be taken when considering layout of the RSET resistor. Please refer to Section 5.1 for more details. Figure 4-1: VOUT vs. RSET In order to determine the best starting value for Rset, the following formula should be used: Rset = 8*(Rtrm/VoutppSE) Where VoutppSE is in Volts, and both resistances are in Ω. Rtrm is the value of the termination resistors, which should be equal to the characteristic impedance of the cable, and is typically 75Ω. The cable must be short (≤1m), and terminated at both ends for the formula to be valid. Example: For a 75Ω cable, Rtrm = 75Ω (at both ends), VoutppSE = 800mV Rset = 8*(75/0.8) = 750Ω 1.75 1.5 1.25 1.0 0.75 0.5 0.25 2.0 0.250 0.500 0.750 1.0 1.25 1.5 RSET (k Ω) |
Podobny numer części - GS2988-INE3 |
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Podobny opis - GS2988-INE3 |
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