Rainbow-electronics MAX3625В Manual de usuario

Busca en linea o descarga Manual de usuario para Hardware De La Computadora Rainbow-electronics MAX3625В. Rainbow Electronics MAX3625В User Manual Manual de usuario

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MAX3625B
Low-Jitter, Precision Clock
Generator with Three Outputs
________________________________________________________________
Maxim Integrated Products
1
19-4978; Rev 0; 10/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
General Description
The MAX3625B is a low-jitter, precision clock generator
optimized for networking applications. The device inte-
grates a crystal oscillator and a phase-locked loop
(PLL) clock multiplier to generate high-frequency clock
outputs for Ethernet, 10G Fibre Channel, and other net-
working applications.
Maxim’s proprietary PLL design features ultra-low jitter
and excellent power-supply noise rejection, minimizing
design risk for network equipment.
The MAX3625B has three LVPECL outputs. Selectable
output dividers and a selectable feedback divider allow
a range of output frequencies.
Applications
Ethernet Networking Equipment
Fibre Channel Storage Area Network
Features
Crystal Oscillator Interface: 24.8MHz to 27MHz
CMOS Input: Up to 320MHz
Output Frequencies
Ethernet: 62.5MHz, 125MHz, 156.25MHz, 312.5MHz
10G Fibre Channel: 159.375MHz, 318.75MHz
Low Jitter
0.14ps
RMS
(1.875MHz to 20MHz)
0.36ps
RMS
(12kHz to 20MHz)
Excellent Power-Supply Noise Rejection
No External Loop Filter Capacitor Required
Ordering Information
CRYSTAL
OSCILLATOR
LVCMOS
DIVIDERS:
M = 24, 25
NA = 10, 2, 4, 5
NB = 10, 2, 4, 5
REF_IN
X_IN
X_OUT
0
1
0
1
PFD FILTER
RESET
RESET
RESET LOGIC/POR
DIVIDER
M
RESET
DIVIDER
NB
DIVIDER
NA
VCO
620MHz TO 648MHz
LVPECL
BUFFER
QA
QA_OE
QA
LVPECL
BUFFER
QB1
QB1
LVPECL
BUFFER
QB0
FB_SEL
QB_OE
QB0
SELB[1:0]
SELA[1:0]IN_SEL
BYPASSMR
MAX3625B
SELA[1:0]
RESET
SELB[1:0]
FB_SEL
BYPASS
33pF
27pF
Block Diagram
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
Typical Application Circuit appears at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX3625BEUG+ -40°C to +85°C 24 TSSOP-EP*
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Indice de contenidos

Pagina 1

MAX3625BLow-Jitter, Precision Clock Generator with Three Outputs________________________________________________________________Maxim Integrated Produ

Pagina 2

MAX3625BLow-Jitter, Precision Clock Generator with Three OutputsMaxim cannot assume responsibility for use of any circuitry other than circuitry entir

Pagina 3

MAX3625BLow-Jitter, Precision Clock Generator with Three Outputs2 ____________________________________________________________________________________

Pagina 4

MAX3625BLow-Jitter, Precision Clock Generator with Three Outputs______________________________________________________________________________________

Pagina 5

MAX3625BLow-Jitter, Precision Clock Generator with Three Outputs4 ____________________________________________________________________________________

Pagina 6

MAX3625BLow-Jitter, Precision Clock Generator with Three Outputs______________________________________________________________________________________

Pagina 7

Detailed DescriptionThe MAX3625B is a low-jitter clock generator designedto operate at Ethernet and Fibre Channel frequencies. Itconsists of an on-chi

Pagina 8

MAX3625BLow-Jitter, Precision Clock Generator with Three Outputs______________________________________________________________________________________

Pagina 9

MAX3625BCrystal SelectionThe crystal oscillator is designed to drive a fundamentalmode, AT-cut crystal resonator. See Table 4 for recom-mended crystal

Pagina 10 - Generator with Three Outputs

Interface ModelsFigures 6 and 7 show examples of interface models.Layout ConsiderationsThe inputs and outputs are critical paths for theMAX3625B, and

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