LMK02002 Datasheet, PDF (1/22 Pages) National Semiconductor (TI) – Precision Clock Conditioner with Integrated PLL

LMK02002
www.ti.com
SNAS418 – AUGUST 2007
LMK02002 Precision Clock Conditioner with Integrated PLL
Check for Samples: LMK02002
FEATURES
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•2 20 fs Additive Jitter
• Integrated Integer-N PLL with Outstanding
Normalized Phase Noise Contribution of -224
dBc/Hz
• Clock Output Frequency Range of 1 to 800
MHz
• 4 LVPECL Clock Outputs
• Dedicated Divider and Delay Blocks on Each
Clock Output
• Pin Compatible Family of Clocking Devices
• 3.15 to 3.45 V Operation
• Package: 48 Pin WQFN (7.0 x 7.0 x 0.8 mm)
TARGET APPLICATIONS
• Data Converter Clocking
• Networking, SONET/SDH, DSLAM
• Wireless Infrastructure
• Medical
• Test and Measurement
• Military / Aerospace
DESCRIPTION
The LMK02002 precision clock conditioner combines
the functions of jitter cleaning/reconditioning,
multiplication, and distribution of a reference clock.
The device integrates a high performance Integer-N
Phase Locked Loop (PLL), and four LVPECL clock
output distribution blocks.
Each clock distribution block includes a
programmable divider, a phase synchronization
circuit, a programmable delay, a clock output mux,
and an LVPECL output buffer. This allows multiple
integer-related and phase-adjusted copies of the
reference to be distributed to eight system
components.
The clock conditioner comes in a 48-pin WQFN
package and is footprint compatible with other
clocking devices in the same family.
Functional Block Diagram
OSCin
OSCin*
R Divider
N Divider
Phase
Detector
Charge
Pump
CPout
Fin
Fin*
Distribution Path
CLK
DATA
LE
PWire
Port
Control
Registers
Divider
Mux
Delay
Divider
Mux
Delay
CLKout0
CLKout0*
CLKout1
CLKout1*
GOE
SYNC*
Device
LD
Control
Clock Buffers
Divider
Mux
Delay
Divider
Mux
Delay
CLKout2
CLKout2*
CLKout3
CLKout3*
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated