Integrated
Circuit
Systems, Inc.
Product Brief
M660
D
UAL
SAW, S
ELECTABLE
F
REQUENCY
VCSO
P
IN
A
SSIGNMENT
(9 x 14 mm SMT)
nFOUT
5
FOUT
4
3
GND
VCC
6
1
VIN
G
ENERAL
D
ESCRIPTION
The M660-01 is a dual SAW, selectable frequency
VCSO for low-jitter clock generation. An integrated
SAW (surface acoustic wave) delay line implements
the high-Q VCO (voltage controlled oscillator) function,
which results in low output phase noise and very low
jitter. The M660-01 is available in a range of center
frequencies from 125 to 175MHz. The M660-02 is
available in a range of center frequencies from 500 to
700MHz. Minimum pull-range is +50 ppm (wider
pull-range is available). The M660 is well suited for
phase-locked loop implementations, clock and data
recovery circuits, and other timing applications in
telecom and optical fiber networking systems
(e.g., OC-48, OC-192).
M660
(Top View)
2
F
EATURES
•
M660-01 output frequencies from 125 to 175 MHz
•
•
•
•
•
•
•
•
M660-02 output frequencies from 500 to 700 MHz
(Specify center frequency at time of order)
Two integrated SAW devices
Selectable output frequency
Supports multi-rate optical interface requirements
Low phase jitter 0.37ps rms typical (12kHz to 20MHz)
Low phase noise -70dBc/Hz @ 1kHz offset
Differential 3.3V LVPECL output
Single 3.3V power supply
Small 9 x 14 mm SMT (surface mount) package
Sample of Available Output Frequencies
VCSO Center Frequency
1
(MHz)
622.0800
625.0000
644.5313
669.3266
Applications
SONET/SDH
Gigabit Ethernet
Gigabit Ethernet FEC
SONET/SDH FEC
1. Specify VCSO center frequency at time of order
B
LOCK
D
IAGRAM
M660
SAW Delay Line
VCSO
Phase
Shifter
F_SEL
VIN
SAW Delay Line
FOUT
nFOUT
VCSO
Phase
Shifter
F_SEL
M660 PB Rev 2.1
M660 Dual SAW, Selectable Frequency VCSO
Revised 12Nov2003
●
Integrated Circuit Systems, Inc.
Communications Modules
●
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●
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