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MAX3627CTJ+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3627CTJ+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 11 page +3.3V, Low-Jitter, Precision Clock Generator with Multiple Outputs Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. Interface Models Figures 7, 8, and 9 show examples of interface models. Layout Considerations The inputs and outputs are the most critical paths for the MAX3627 and great care should be taken to mini- mize discontinuities on these transmission lines between the connector and the IC. Here are some sug- gestions for maximizing the performance of the MAX3627: • An uninterrupted ground plane should be posi- tioned beneath the clock outputs. The ground plane under the crystal should be removed to mini- mize capacitance. • Ground pin vias should be placed close to the IC and the input/output interfaces to allow a return current path to the MAX3627 and the receive devices. • Supply decoupling capacitors should be placed close to the supply pins, preferably on the same layer as the MAX3627. • Take care to isolate crystal input traces from the MAX3627 outputs. • The crystal, trace, and two external capacitors should be placed on the board as close as possi- ble to the X_IN and X_OUT pins. • Maintain 100 Ω differential (or 50Ω single-ended) transmission line impedance into and out of the part. • Use good high-frequency layout techniques and multilayer boards with an uninterrupted ground plane to minimize EMI and crosstalk. Refer to the MAX3627 evaluation kit for more information. Exposed-Pad Package The exposed pad on the 32-pin TQFN package pro- vides a very low inductance path for return current trav- eling to the PCB ground plane. The pad is thermal and electrical ground on the MAX3627 and must be sol- dered to the circuit board ground for proper electrical performance. Chip Information PROCESS: BiCMOS 180k Ω 1.4V ESD STRUCTURES OSC_IN VDD Figure 7. Simplified OSC_IN Pin Circuit Schematic 10 Ω 10 Ω ESD STRUCTURES Q7 VDDO_SE Figure 8. Simplified LVCMOS Output Circuit Schematic 75k Ω ESD STRUCTURES OE VDD VDDO_DIFF Figure 9. Simplified OE Pin Circuit Schematic Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 32 TQFN-EP T3255+5 21-0140 |
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