Renesas ICS601-21 User manual

ICS601-21 Preliminary 1Revision 010405

Integrated Circuit Systems, Inc. l525 Race Street, San Jose, CA 95126 ltel (408) 297-1201 lwww.icst.com

ICS601-21 Demo Board Instructions

ICS601-21 Demo Board

The ICS601-21 demo board provides a way to quickly evaluate the performance of the ICS601-21 Low

Phase Noise Clock Multiplier.

Power

Connect either 3.3 volts across the VDD and GND header pins.

Frequency Selection

The output frequency can be changed by setting S0, S1 and S2 on SW1 according to the information in the

Multiplier Select Table on page 2 of the datasheet. Alternatively, shunts can be soldered to the appropriate

0604 device landings underneath SW1. Turning on a switch or stuffing a shunt will pull that particular input

low. Opening the switch or removing the shunt will allow the on-chip pull-up resistors to take the input high.

Input Options

The ICS601-21 Demo board supports either a thru hole or an SMT crystal or a single ended clock input.

Crystal Tuning

In order to achieve 0 PPM frequency synthesis, the ICS601-21 supports external tuning capacitors (C1 and

C2). For exact tuning when using a crystal, capacitors should be connected from pins X1 to ground and X2

to ground. The value of these capacitors is given by the following equation, where CLis the specified

crystal load capacitance in pF:

C1 and C2 (pF) = (CL - 5) x 2.

So, for a crystal with 16 pF load capacitance, use two 22 pF caps.

Output Termination

The 50 ohm resistors R3 and R5 as serve as termination resistors to ground. These values match the

PCB’s trace impedance. Component locations R2 and R4 are provided to allow for user experimentation.

This “on-board” termination allows the clock outputs to be measured directly with a high impedance

oscilloscope probe. To use “off-board” termination, remove R3 and R5, connect 50 ohm coax cables

between the clock connectors and the oscilloscope and terminate with 50 ohms in the oscilloscope.

Trace Impedance

The ICS601-21 board has controlled impedance traces of 50 ohms for all clock inputs and outputs.

Component Crystal Input 50 ohm Clock Input

CN1 open SMA connector

R1 open short

C2 open 50 ohm

Y1/Y2 stuff only one open

ICS601-21 Demo Board Instructions

ICS601-21 Preliminary 2Revision 010405

Integrated Circuit Systems, Inc. l525 Race Street, San Jose, CA 95126 ltel (408) 297-1201 lwww.icst.com

Demo Board Schematics

ICS601-21 Demo Board Instructions

ICS601-21 Preliminary 3Revision 010405

PCB Power Plane

PCB Ground Plane

PCB Top

PCB Bottom

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(Rev.1.0 Mar 2020)

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