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M685-01-BB-BD

Description
DUAL SAW, SELECTABLE FREQUENCY VCSO
File Size194KB,7 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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M685-01-BB-BD Overview

DUAL SAW, SELECTABLE FREQUENCY VCSO

Integrated
Circuit
Systems, Inc.
Preliminary Information
M685
nFOUT
D
UAL
SAW, S
ELECTABLE
F
REQUENCY
VCSO
P
IN
A
SSIGNMENT
(5 x 7.5mm SMT)
FOUT
VCC
G
ENERAL
D
ESCRIPTION
The M685 is a dual SAW, selectable frequency VCSO
frequency source 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 M685-01 is available in
a range of center frequencies from 125 to 175 MHz.
The M685-02 provides 500 to 700 MHz. Guaranteed
minimum pull-range of
±120
ppm meets GbE
requirements. (It also fully satisfies
±50
ppm minimum
pull-range specification commonly required.) Industry-
standard Kvco (VCO Gain) provides full replacement
compatibility. The M685 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).
6
5
M685
M680
( To p Vi ew)
1
2
VIN
F_SEL
Figure 1: Pin Assignment
Sample of Available Output Frequencies
VCSO Center
Frequencies
1
(MHz)
155.5200, 167.3316
156.2500, 161.1328
622.0800, 669.3266
625.0000, 644.5313
Applications
SONET/SDH, SONET/SDH FEC
Gigabit Ethernet, GbE FEC
SONET/SDH, SONET/SDH FEC
Gigabit Ethernet, GbE FEC
F
EATURES
Two integrated SAW devices and selectable output
frequency; supports multi-rate optical interfaces
M685-01 output frequencies from 125 to 175 MHz
M685-02 output frequencies from 500 to 700 MHz
(Specify center frequencies at time of order)
Industry-standard Kvco for full compatibility
Low phase jitter 0.2ps rms typical for the M685-02
(50kHz to 80MHz)
Differential 3.3V LVPECL output
Single 3.3V power supply
Small 5 x 7.5mm SMT (surface mount) package
Table 1: Sample of Available Output Frequencies
Note 1: Specify VCSO center frequencies at time of order
B
LOCK
D
IAGRAM
M680
M685
SAW Delay Line
VCSO
Phase
Shifter
VIN
SAW Delay Line
VCSO
Phase
Shifter
F_SEL
Figure 2: Block Diagram
M685 Datasheet Rev 0.4
M685 Dual SAW, Selectable Frequency VCSO
I n t e g r a t e d C i r c u i t S y s t e m s, I n c .
Networking & Communications
w w w. i c s t . c o m
tel (508) 852-5400
GND
3
4
FOUT
nFOUT
Revised 16Nov2004

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