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5V50009DCG8 Datasheet(PDF) 3 Page - Integrated Device Technology

Part # 5V50009DCG8
Description  SPREAD SPECTRUM CLOCK GENERATOR
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

5V50009DCG8 Datasheet(HTML) 3 Page - Integrated Device Technology

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IDT5V50009
SPREAD SPECTRUM CLOCK GENERATOR
SSCG
IDT™ SPREAD SPECTRUM CLOCK GENERATOR
3
IDT5V50009
REV C 040609
External Components
The IDT5V50009 requires a minimum number of external
components for proper operation.
Decoupling Capacitor
A decoupling capacitor of 0.01µF must be connected
between VDD and GND, as close to these pins as possible.
For optimum device performance, the decoupling capacitor
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 trace between the clock output and the load
is over 1 inch, series termination should be used. To series
terminate a 50
Ω trace (a commonly used trace impedance)
place a 33
Ωresistor 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.
PCB Layout Recommendations
For optimum device performance and lowest output phase
noise, the following guidelines should be observed.
1) The 0.01µF decoupling capacitor should be mounted on
the component side of the board as close to the VDD pin as
possible. No vias should be used between the decoupling
capacitor and VDD pin. The PCB trace to VDD pin should
be kept as short as possible, as should the PCB trace to the
ground via.
2) To minimize EMI, the 33
Ω series termination resistor (if
needed) should be placed close to the clock output.
3) An optimum layout is one with all components on the
same side of the board, minimizing vias through other signal
layers. Other signal traces should be routed away from the
IDT5V50009. This includes signal traces just underneath
the device, or on layers adjacent to the ground plane layer
used by the device.
Crystal Information
The crystal used should be a fundamental mode (do not use
third overtone), parallel resonant. Crystal capacitors should
be connected from pins X1 to ground and X2 to ground to
optimize the initial accuracy. The value of these capacitors
is given by the following equation:
Crystal caps (pF) = (CL - 6) x 2
In the equation, CL is the crystal load capacitance. So, for a
crystal with a 16 pF load capacitance, two 20 pF [(16-6) x 2]
capacitors should be used.
Spread Spectrum Profile
The IDT5V50009 low EMI clock generator uses an
optimized frequency slew rate algorithm to facilitate down
stream tracking of zero delay buffers and other PLL devices.
The frequency modulation amplitude is constant with
variations of the input frequency.
Ti m e
Modulation Rate


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