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ICS613MLFT Datasheet(PDF) 3 Page - Integrated Circuit Systems |
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ICS613MLFT Datasheet(HTML) 3 Page - Integrated Circuit Systems |
3 / 6 page LOW PHASE NOISE CLOCK MULTIPLIER MDS 613 C 3 Revision 111204 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com ICS613 External Component Selection The ICS613 requires a minimum number of external components for proper operation. Decoupling Capacitors Decoupling capacitors of 0.01 µF should be connected between VDD and GND pairs on pins 4 and 5, pins 6 and 8, pins 11 and 9, and pins 13 and 14 as close to the ICS613 as possible. For optimum device performance, the decoupling capacitors should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit. Series Termination Resistor When the PCB traces between the clock outputs and the loads are over 1 inch, series termination should be used. To series terminate a 50 Ω trace (a commonly used trace impedance) place a 33 Ω resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20 Ω. Crystal Tuning Load Capacitors The device crystal connections should include pads for small capacitors from X1 to ground and from X2 to ground. These capacitors are used to adjust the stray capacitance of the board to match the nominally required crystal load capacitance. Because load capacitance can only be increased in this trimming process, it is important to keep stray capacitance to a minimum by using very short PCB traces (and no vias) been the crystal and device. Crystal capacitors must be connected from each of the pins X1 and X2 to ground. The value (in pF) of these crystal caps should equal (CL -6pF)*2. In this equation, CL= crystal load capacitance in pF. Example: For a crystal with a 16 pF load capacitance, each crystal capacitor would be 20 pF [(16-6) x 2] = 20. Reducing Jitter and Phase Noise For applications that only require one output, jitter and phase noise can be reduced by tying the unused VDDO to ground. This will stop the output clock low which will result in less switching noise on the active output. Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS613. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. Item Rating Supply Voltage, VDD 7V All Inputs and Outputs -0.5V to VDD+0.5V Ambient Operating Temperature 0 to +70 °C Storage Temperature -65 to +150 °C Soldering Temperature 260 °C |
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