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SIT5021 Datasheet(PDF) 4 Page - SiTime Corp. |
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SIT5021 Datasheet(HTML) 4 Page - SiTime Corp. |
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4 / 13 page ![]() The Smart Timing Choice The Smart Timing Choice SiT5021 1-220 MHz High Performance Differential (VC) TCXO Rev. 1.5 Page 4 of 8 www.sitime.com Termination Diagrams LVPECL: Z0 = 50 Z0 = 50 D+ D- OU T+ OU T- 50 VTT = VD D – 2.0 V LVPE C L D river Receiver Device 50 VDD Figure 3. LVPECL Typical Termination D+ D- OUT+ OUT- LVPECL Driver Receiver Device Z0 = 50 Z0 = 50 R1 50 50 R1 VTT 100 nF 100 nF VDD VDD= 3.3V => R1 = 100 to 150 VDD= 2.5V => R1 = 75 Figure 4. LVPECL AC Coupled Termination Z0 = 50 Z0 = 50 D+ D- OUT+ OUT- LVPECL Driver Receiver Device R1 R2 R3 R4 VDD VDD = 3.3V => R1 = R3 = 133 and R2 = R4 = 82 VDD = 2.5V => R1 = R3 = 250 and R2 = R4 = 62.5 VDD Figure 5. LVPECL with Thevenin Typical Termination |
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