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CDCLVP111VFR 데이터시트(PDF) 11 Page - Texas Instruments |
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CDCLVP111VFR 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 29 page CLK_SEL VBB 30 31 29 28 27 26 23 22 24 21 20 19 18 17 15 14 13 12 11 10 5 CLK0 CLK0 CLK1 CLK1 0 1 3 4 6 7 2 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q0 Q1 Q2 Q3 Q4 Q5 Q7 Q6 Q9 Q8 + + - - - - - CDCLVP111 www.ti.com SCAS859F – JANUARY 2009 – REVISED JUNE 2015 8 Detailed Description 8.1 Overview The CDCLVP111 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 8 (a and b) for VCC = 2.5 V and Figure 9 (a and b) for VCC = 3.3 V, respectively. TI recommends 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. 8.2 Functional Block Diagram 8.3 Feature Description The CDCLVP111 is a low-additive jitter universal to LVPECL fan out buffer with 2 selectable inputs. The small package, low-output skew, and low-additive jitter make for a flexible device in demanding applications. Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: CDCLVP111 |
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