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NB3H5150 Datasheet(PDF) 16 Page - ON Semiconductor |
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NB3H5150 Datasheet(HTML) 16 Page - ON Semiconductor |
16 / 19 page NB3H5150 www.onsemi.com 16 Interfacing from 3.3 V LVPECL to LVDS Since the output levels VOH and VOL of 3.3 V LVPECL are more positive than the input range of LVDS receiver, a special interface is required. (See Figures 12 and 13). Furthermore, the open emitter design of the ECL output structure needs proper termination, which can be implemented with a resistor divider network to generate proper LVDS DC levels (eq. 1). RE1 ) RE2 + RE (eq. 1) The resistor divider network will divide the output common mode voltage of LVPECL (VCM(LVPECL)) to input common mode voltage of LVDS (VCM(LVDS)). RE2 RE1 ) RE2 + VCM(LVDS) VCM(LVPECL) (eq. 2) Where: RE1 = partial emitter current bias resistor RE2 = partial emitter current bias resistor RE = RE1 + RE2, the total emitter current bias resistor (see AND8020) VCM(LVPECL) = Common Mode Voltage VCM(LVDS) = Common Mode Voltage 3.3 V LVPECL output will be able to drive an LVDS receiver with or without an internal 100 W termination resistor. Figure 12. Interfacing 3.3 V LVPECL to LVDS LVPECL LVDS 3.3 V VCC RE1 RE1’ RE2’ RE2 ZO ZO ZO ZO RT 100 W Figure 13. Interfacing LVPECL to LVDS with Internal 100 W Termination Resistor LVPECL LVDS 3.3 V VCC RE1 RE1’ RE2’ RE2 RT 100 W ZO ZO ZO ZO Examples: For 50 W controlled impedance, the resistor values for 3.3V LVPECL converted to LVDS voltage levels are as follows: RE1 = 55 W RE2 = 95 W RE1 + RE2 = RE = 150 W RT = 100 W VCM(LVPECL) = 1.9 V VCM(LVDS) = 1.2 V |
Similar Part No. - NB3H5150_16 |
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Similar Description - NB3H5150_16 |
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