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ICS85322AMI Datasheet(PDF) 7 Page - Integrated Circuit Systems |
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ICS85322AMI Datasheet(HTML) 7 Page - Integrated Circuit Systems |
7 / 13 page 85322AMI www.icst.com/products/hiperclocks.html REV. B OCTOBER 7, 2003 7 Integrated Circuit Systems, Inc. ICS85322I DUAL LVCMOS / LVTTL-TO-DIFFERENTIAL 2.5V / 3.3V LVPECL TRANSLATOR TERMINATION FOR 2.5V LVPECL OUTPUT Figure 2A and Figure 2B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminat- ing 50 Ω to V CC - 2V. For VCC = 2.5V, the VCC - 2V is very close to ground level. The R3 in Figure 2B can be eliminated and the termination is shown in Figure 2C. FIGURE 2C. 2.5V LVPECL TERMINATION EXAMPLE R2 50 Zo = 50 Ohm VCCO=2.5V R1 50 Zo = 50 Ohm + - 2.5V 2,5V LVPECL Driv er FIGURE 2B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE VCCO=2.5V R1 50 R2 50 Zo = 50 Ohm R3 18 2,5V LVPECL Driv er Zo = 50 Ohm + - 2.5V FIGURE 2A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE R2 62.5 2.5V 2,5V LVPECL Driv er R3 250 Zo = 50 Ohm Zo = 50 Ohm R4 62.5 2.5V + - R1 250 VCCO=2.5V |
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