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G261 Datasheet(PDF) 3 Page - Global Mixed-mode Technology Inc |
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G261 Datasheet(HTML) 3 Page - Global Mixed-mode Technology Inc |
3 / 5 page Ver 3.2 Dec 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 3 G261 Global Mixed-mode Technology Inc. Application Information Figure 1. LVD SCSI Discrete Resistor Stack Table1. Resistor Network v.s Standard OUTPUTS SPECIFICATION 107.3Ω Diff 100Ω to 110Ω 112.9mV Diff Bias 100mV to 125mV 237Ω Common Mode 100Ω to 300Ω 1.25V Common Mode 1.2V to 1.30V Application Note: The resistor network, along with the 1.75V and 0.75V references will give the correct dif- ferential impedance, bias voltage, common mode impedance and common mode voltage as show in Table 1. Layout guideline: 1. For stable operation, the 1µF capacitor on TERMPWR pin and 4.7µF capacitors on REG1 and REG2 pins must be placed within 0.25 inch of their respective pins. 2. The PCB trace length form Lx- and Lx+ to the connector pins (all 27pairs) must be of equal length, in or- der to minimize the signal skew among these pairs. In addition, these traces must be as short as possible, in order to minimize capacitance. REF 1.3V SOURCE/SINK REGULATOR 50 mA SOURCE/SINK TERMPWR 50 mA SOURCE/SINK DIFFSENSE REG1 REG2 SOURCE 5 to 15mA REF 1.75V REF 0.75V SOURCE/SINK REGULATOR 4.7µF 4.7µF 121 1% 121 1% L1- L1+ L27- L27+ 475 1% 475 1% 475 1% PGND 475 1% 1.3V ±0.1V 1.75V ±50mV 0.75V ±50mV 1µF DIFFSENSE: SOURCE ONLY FROM TERMPWR to DIFFSENS pin REF 1.3V SOURCE/SINK REGULATOR 50 mA SOURCE/SINK TERMPWR 50 mA SOURCE/SINK DIFFSENSE REG1 REG2 SOURCE 5 to 15mA REF 1.75V REF 0.75V SOURCE/SINK REGULATOR 4.7µF 4.7µF 121 1% 121 1% L1- L1+ L27- L27+ 475 1% 475 1% 475 1% PGND 475 1% 1.3V ±0.1V 1.75V ±50mV 0.75V ±50mV 1µF DIFFSENSE: SOURCE ONLY FROM TERMPWR to DIFFSENS pin |
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