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ICS601M-01ILFT Datasheet(PDF) 3 Page - Integrated Circuit Systems

Part # ICS601M-01ILFT
Description  LOW PHASE NOISE CLOCK MULTIPLIER
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS601M-01ILFT Datasheet(HTML) 3 Page - Integrated Circuit Systems

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LOW PHASE NOISE CLOCK MULTIPLIER
MDS 601-01 L
3
Revision 111204
In te gr ated Circuit Systems 525 Ra ce Street, San Jose, CA 9512 6 tel (4 08) 297-1 201 www.icst.com
ICS601-01
Achieving Low Phase Noise
Figure 1 shows a typical phase noise measurement in a 125 MHz system. Therea are a few simple steps
that can be taken to achieve these levels of phase noise from the ICS601-01. Variations in VDD will
increase the hase noise, so it is important to have a stable, low noise supply voltage at the device. Use
decoupling capacitors of 0.1
µF in parallel with 0.01µF. It is important to have these capacitors as close as
possible to the ICS601-01 supply pins.
Disabling the REFOUT clock is also important for achieving low phase noise; lab tests have shown that this
can reduce the phase noise by as much as 10 dBc/Hz.
External Component/Crystal Selection
The ICS601-01 requires a minimum number of external components for proper operation. Decoupling
capacitors of 0.01
µF and 0.1µF should be connected between VDD and GND, as close to the part as
possible. A series termination resistor of 33
Ω may be used for each clock output. The crystal must be
connected as close to the chip as possible. The crystal should be fundamental mode, parallel resonant. Do
not use third overtone. For exact tuning when using a crystal, capacitors should beconnected from pins X1
to ground and X2 to ground. In general, the value of these capacitors is given by the following equation,
where CL is the crystal load capacitance: Crystal caps (pF) = (CL - 5) x 2. So for a crystal with 16 pF load
capacitance, two 22 pF caps can be used. For any given board layout, ICS can measure the board
capacitance and recommend the exact capacitance value to use.
Figure1. PhaseNoiseof ICS601-01for125MHzoutput, 25MHzcrystal input.
VDD=3.3V, REFOUTdisabled.
-140
-120
-100
-80
-60
-40
-20
0
1.00E+01
1.00E+02
1.00E+03
1.00E+04
1.00E+05
1.00E+06
1.00E+07
Offset fromCarrier (Hz)


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