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CDCLVP1204RGTT 데이터시트(PDF) 11 Page - Texas Instruments |
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CDCLVP1204RGTT 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 22 page Board Supply Chip Supply C 10 F m C 1 F m C 0.1 F m FerriteBead V CC (a) Output DC Termination (b) Output AC Termination CDCLVP1204 LVPECL 86 W 86 W 50 W 50 W V BB CDCLVP1204 LVPECL 250 W 62.5 W 250 W 62.5 W V CC V CC CDCLVP1204 www.ti.com SCAS880C – AUGUST 2009 – REVISED AUGUST 2011 Figure 13 illustrates this recommended power-supply decoupling method. Figure 13. Power-Supply Decoupling LVPECL Output Termination The CDCLVP1204 is an open emitter for LVPECL outputs. Therefore, proper biasing and termination are required to ensure correct operation of the device and to minimize signal integrity. The proper termination for LVPECL outputs is a 50 Ω to (VCC –2) V, but this dc voltage is not readily available on PCB. Therefore, a Thevenin equivalent circuit is worked out for the LVPECL termination in both direct-coupled (dc) and ac-coupled configurations. These configurations are shown in Figure 14a and b for VCC = 2.5 V and Figure 15a and b for VCC = 3.3 V, respectively. It is recommended to place all resistive components close to either the driver end or the receiver end. If the supply voltage for the driver and receiver is different, ac coupling is required. Figure 14. LVPECL Output DC and AC Termination for VCC = 2.5 V Copyright © 2009–2011, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): CDCLVP1204 |
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