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SY58012UMGTR Datasheet(PDF) 8 Page - Micrel Semiconductor |
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SY58012UMGTR Datasheet(HTML) 8 Page - Micrel Semiconductor |
8 / 9 page 8 Precision Edge® SY58012U Micrel, Inc. M9999-020207 hbwhelp@micrel.com or (408) 955-1690 Part Number Function Data Sheet Link SY58011U 7GHz, 1:2 CML Fanout Buffer/Translator http://www.micrel.com/product-info/products/sy58011u.shtml With Internal Input Termnations SY58012U 5GHz, 1:2 LVPECL Fanout Buffer/Translator http://www.micrel.com/product-info/products/sy58012u.shtml With Internal Input Termination SY58013U 6GHz, 1:2 Fanout Buffer/Translator w/400mV http://www.micrel.com/product-info/products/sy58013u.shtml LVPECL Outputs and Internal Terminations 16-MLF™ Manufacturing Guidelines www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf Exposed Pad Application Note M-0317 HBW Solutions http://www.micrel.com/product-info/as/solutions.shtml RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION R2 82 Ω R2 82 Ω ZO = 50Ω ZO = 50Ω +3.3V* +3.3V* VT = VCC —2V R1 130 Ω R1 130 Ω +3.3V* Figure 5. Parallel Termination-Thevenin Equivalent Note 1. For +2.5V systems: R1 = 250 Ω, R2 = 62.5Ω Note 2. For +3.3V systems: R1 = 130 Ω, R2 = 82Ω Z = 50 Ω Z = 50 Ω 50 Ω 50 Ω 50 Ω +3.3V +3.3V source destination Rb C1 0.01 µF (optional) Figure 6. Three-Resistor “Y–Termination” Note 1. Power-saving alternative to Thevenin termination. Note 2. Place termination resistors as close to destination inputs as possible. Note 3. Rb resistor sets the DC bias voltage, equal to VT. For +2.5V systems Rb = 19Ω. For +3.3V systems Rb = 46Ω to 50Ω. Note 4. C1 is an optional bypass capacitor intended to compensate for any tr/tf mismatches. LVPECL OUTPUT +3.3V +3.3V ZO = 50Ω R2 82 Ω +3.3V +3.3V R1 130 Ω R1 130 Ω R2 82 Ω VT = VCC —2V Q /Q R4 1k Ω R3 1.6k Ω VT = VCC —1.3V Figure 7. Terminating Unused I/O Note 1. Unused output (/Q) must be terminated to balance the output. Note 2. For +2.5V systems: R1 = 250 Ω, R2 = 62.5Ω, R3 = 1.25kΩ, R4 = 1.2k Ω. For +3.3V systems: R1 = 130 Ω, R2 = 82Ω, R3 = 1kΩ, R4 = 1.6kΩ. Note 3. Unused output pairs (Q and /Q) may be left floating. LVPECL output have very low output impedance (open emitter), and small signal swing which results in low EMI. LVPECL is ideal for driving 50 Ω and 100Ω controlled impedance transmission lines. There are several techniques in terminating the LVPECL output, as shown in Figures 5 through 7. |
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