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AN1568D Datasheet(PDF) 5 Page - ON Semiconductor |
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AN1568D Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 10 page AN1568/D http://onsemi.com 5 termination should be used and placed as close as possible to the coupling capacitors. (Figure 7) Figure 7. Capacitive Coupling ECL to LVDS Using VOS Reference Voltage Z = 50 W Z = 50 W ECL 1 k W 1 k W 100 k W VOS= 1.2 V 10 pF 10 pF 3.3 V 50 W 50 W VTT LVDS Direct Interfacing Interfacing from 2.5 V LVPECL to LVDS Provided that the LVDS receiver can tolerate large input voltage peak to peak amplitude, 2.5 V LVPECL can be directly interfaced to LVDS receiver using proper ECL termination. 2.5 V LVPECL will be able to drive LVDS receiver with and without internal 100 W termination resistor. (See Figures 8, 9 and 10). Figure 8. Interfacing 2.5 V LVPECL to LVDS with External 100 W Termination Resistor 100 W LVPECL 2.5 V VCC RT RT LVDS ZO ZO Figure 9. Interfacing 2.5 V LVPECL to LVDS with Internal 100 W Termination Resistor 100 W LVPECL 2.5 V VCC RT RT LVDS ZO ZO Figure 10. PSPICE Simulation Levels of 2.5V LVPECL to LVDS Interface with Example Resistor Values 1.50 V 0.78 V 720 mV LVDS Input 2.5 V LVPECL Output Where RT = 75 W Furthermore, sreies termination can be used to reduce the amplitude of the signal as described in AND8020 application note, by placing RS resistor between the driver and the transmission line. (See Figures 11, 12 and 13). Figure 11. Interfacing 2.5 V LVPECL to LVDS with Series RS and External 100 W Termination Resistor 100 W LVPECL 2.5 V VCC RT RT LVDS ZO ZO RS RS |
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