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SY89529LZH Datasheet(PDF) 7 Page - Micrel Semiconductor |
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SY89529LZH Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 11 page 7 Precision Edge® SY89529L Micrel, Inc. M9999-110405 hbwhelp@micrel.com or (408) 955-1690 Power Supply Filtering Techniques As in any high speed integrated circuits, power supply filtering is very important. V CC1, VCC_Analog, VCC_TTL and V CC_OUT should be individually connected to the power supply plane through vias, and bypass capacitors should be used for each pin. To achieve optimum jitter performance, better power-supply isolation is required. In this case a ferrite bead along with a 1 µF and a 0.01µF bypass capacitor should be connected to each power supply pin. Figure 6 illustrates power-supply filtering using ferrite beads and bypass capacitors. *For VCC_Analog,VCC_TTL, VCC1, use ferrite bead = 200mA, 0.45 Ω DC, Murata P/N BLM21A1025 *For VCC_OUT use ferrite bead = 3A, 0.025 Ω DC, Murata, P/N BLM31P005 *Componet sizs: 0805 1 µF 22 µF 0.01 µF Ferrite Bead* “Power Supply” side “Device” side VCC Pins Figure 5. Power Supply Filtering Termination for PECL Outputs The differential PECL outputs, FOUT and /FOUT, are low- impedance emitter-follower outputs. Therefore, terminating resistors (DC current path to ground) or current sources must be used for functionality. These outputs are designed to drive 50 Ωtransmissionlines.Matchedimpedancetechniquesshould be used to maximize operating frequency and minimize signal distortion. There are a few simple termination schemes. Figure 7 shows a common 3-resistor termination scheme. For more termination examples, see Micrel’s Application Note 9 online at www.micrel.com. z = 50 Ω Low impedance, emitter-follower outputs z = 50 Ω 50 Ω FOUT /FOUT 50 Ω SY89529L 3-resistor network available* *3-resistor network = Thin-film Technologies, P/N TFT-RN1632-AN1DNC 50 Ω Figure7. LVPECL Output Termination |
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