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5V41235PGG датащи(PDF) 4 Page - Integrated Device Technology

номер детали 5V41235PGG
подробное описание детали  2 OUTPUT PCIE GEN1/2/3 SYNTHESIZER
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производитель  IDT [Integrated Device Technology]
домашняя страница  http://www.idt.com
Logo IDT - Integrated Device Technology

5V41235PGG датащи(HTML) 4 Page - Integrated Device Technology

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5V41235
2 OUTPUT PCIE GEN1/2/3 SYNTHESIZER
IDT® 2 OUTPUT PCIE GEN1/2/3 SYNTHESIZER
4
5V41235
MAY 5, 2017
Applications Information
External Components
A minimum number of external components are required for
proper operation.
Decoupling Capacitors
Decoupling capacitors of 0.01
F should be connected
between each VDD pin and the ground plane, as close to
the VDD pin as possible. Do not share ground vias between
components. Route power from power source through the
capacitor pad and then into ICS pin.
Crystal
A 25 MHz fundamental mode parallel resonant crystal
should be used. This crystal must have less than 300 ppm
of error across temperature in order for the 5V41235 to meet
PCI Express specifications.
Crystal Capacitors
Crystal capacitors are connected from pins X1 to ground
and X2 to ground to optimize the accuracy of the output
frequency.
CL= Crystal’s load capacitance in pF
Crystal Capacitors (pF) = (CL- 7) * 2
For example, for a crystal with a 8pF load cap, each external
crystal cap would be 2pF [(8-7)*2=2].
Current Source (Iref) Reference Resistor - RR
If board target trace impedance (Z) is 50
, then R
R = 475
(1%), providing IREF of 2.32 mA. The output current (IOH) is
equal to 6*IREF.
Output Termination
The PCI-Express differential clock outputs of the 5V41235
are open source drivers and require an external series
resistor and a resistor to ground. These resistor values and
their allowable locations are shown in detail in the
PCI-Express Layout Guidelines section.
The 5V41235 can also be configured for LVDS compatible
voltage levels. See the LVDS Compatible Layout
Guidelines section.
Output Structures
General PCB Layout Recommendations
For optimum device performance and lowest output phase
noise, the following guidelines should be observed.
1. Each 0.01µF decoupling capacitor should be mounted on
the component side of the board as close to the VDD pin as
possible.
2. No vias should be used between decoupling capacitor
and VDD pin.
3. The PCB trace to VDD pin should be kept as short as
possible, as should the PCB trace to the ground via.
Distance of the ferrite bead and bulk decoupling from the
device is less critical.
4. An optimum layout is one with all components on the
same side of the board, minimizing vias through other signal
layers (any ferrite beads and bulk decoupling capacitors can
be mounted on the back). Other signal traces should be
routed away from the 5V41235.This includes signal traces
just underneath the device, or on layers adjacent to the
ground plane layer used by the device.
R
R
475
6*IREF
=2.3 mA
IREF
See Output Termination
Sections - Pages 3 ~ 5


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