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ICS84329BVT bảng dữ liệu(PDF) 12 Page - Integrated Circuit Systems |
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ICS84329BVT bảng dữ liệu(HTML) 12 Page - Integrated Circuit Systems |
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12 / 19 page ![]() 84329BV www.icst.com/products/hiperclocks.html REV. B JANUARY 18, 2006 12 Integrated Circuit Systems, Inc. ICS84329B 700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER V CC - 2V 50 Ω 50 Ω RTT Z o = 50Ω Z o = 50Ω FOUT FIN RTT = Z o 1 ((V OH + VOL) / (VCC – 2)) – 2 3.3V 125 Ω 125 Ω 84 Ω 84 Ω Z o = 50Ω Z o = 50Ω FOUT FIN The clock layout topology shown below is a typical termina- tion for LVPECL outputs. The two different layouts mentioned are recommended only as guidelines. FOUT and nFOUT are low impedance follower outputs that generate ECL/LVPECL compatible outputs. Therefore, ter- minating resistors (DC current path to ground) or current sources must be used for functionality. These outputs are FIGURE 6B. LVPECL OUTPUT TERMINATION FIGURE 6A. LVPECL OUTPUT TERMINATION designed to drive 50 Ω transmission lines. Matched imped- ance techniques should be used to maximize operating frequency and minmize signal distortion. Figures 6A and 6B show two different layouts which are recommended only as guidelines.Other suitable clock layouts may exist and it would be recommended that the board designers simulate to guarantee compatibility across all printed circuit and clock component process variations. TERMINATION FOR LVPECL OUTPUTS |
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