Integrated
Circuit
Systems, Inc.
Preliminary Information
M680-02
D
UAL
SAW, S
ELECTABLE
F
REQUENCY
VCSO
P
IN
A
SSIGNMENT
(5 x 7mm SMT)
nFOUT
(Top View)
G
ENERAL
D
ESCRIPTION
The M680-02 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 M680-02 is available in
a range of center frequencies from 500 to 700MHz.
Minimum pull-range is
±50
ppm (wider pull-range is
available). The M680-02 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).
6
M680-02
M680
1
2
F_SEL
3
GND
Figure 1: Pin Assignment
F
EATURES
◆
Two integrated SAW devices
◆
Selectable output frequency
◆
Supports multi-rate optical interface requirements
◆
VCSO center frequencies from 500 to 700 MHz
(Specify center frequency at time of order)
◆
Low phase jitter 0.37ps rms typical (12kHz to 20MHz)
◆
Low phase noise -70dBc/Hz @ 1kHz offset typical
◆
Differential 3.3V LVPECL output
◆
Single 3.3V power supply
◆
Small 5 x 7mm SMT (surface mount) package
Sample of Available Output Frequencies
VCSO Center Frequency
1
(MHz)
622.0800
625.0000
644.5313
669.3265
Applications
SONET/SDH
Gigabit Ethernet
Gigabit Ethernet FEC
SONET/SDH FEC
Table 1: Sample of Available Output Frequencies
Note 1: Specify VCSO center frequency at time of order.
B
LOCK
D
IAGRAM
M680-02
M680
SAW Delay Line
VCSO
Phase
Shifter
VIN
5
4
FOUT
VCC
VIN
SAW Delay Line
FOUT
nFOUT
VCSO
Phase
Shifter
F_SEL
Figure 2: Block Diagram
M680-02 Datasheet Rev 1.0
M680-02 Dual SAW, Selectable Frequency VCSO
Revised 19Sep2003
●
Integrated Circuit Systems, Inc.
Communications Modules
●
w w w. i c s t . c o m
●
tel (508) 852-5400
Integrated
Circuit
Systems, Inc.
M680-02
D
UAL
SAW, S
ELECTABLE
F
REQUENCY
VCSO
Preliminary Information
P
IN
D
ESCRIPTIONS
Number
1
2
3
4
5
6
Name
VIN
F_SEL
GND
FOUT
nFOUT
VCC
I/O
Configuration
Description
Input
Input
Ground
Output
Power
No internal terminator
Internal pull-down resistor
1
Tuning control voltage.
Frequency select:
Logic
1
selects Frequency 2
.
Logic
0
selects Frequency 1
.
Power supply ground connections.
Clock output pair. Differential LVPECL.
Power supply connection, connect to +
3.3
V.
Table 2: Pin Descriptions
Note 1: See “Frequency Select” in Table
5, DC Characteristics
on
pg. 3.
A
BSOLUTE
M
AXIMUM
R
ATINGS1
Symbol Parameter
Rating
Unit
V
I
V
O
V
CC
T
S
Inputs
Outputs
Power Supply Voltage
Storage Temperature
-
0.5
to V
CC
+
0.5
-
0.5
to V
CC
+
0.5
3.63
V
V
V
o
C
-
55
to +
125
Table 3: Absolute Maximum Ratings
Note 1:Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Functional operation of product at these conditions
or any conditions beyond those listed in
Recommended Conditions of Operation, DC Characteristics,
or
AC Characteristics
is not implied. Exposure to absolute maximum rating conditions for extended periods
may affect product reliability.
R
ECOMMENDED
C
ONDITIONS OF
O
PERATION
Symbol Parameter
Min
2.97
Typ
3.3
25
Max
3.63
Unit
V
CC
T
A
Positive Supply Voltage
Ambient Operating Temperature
V
o
C
-
40
+
85
Table 4: Recommended Conditions of Operation
M680-02 Datasheet Rev 1.0
Integrated Circuit Systems, Inc.
●
2 of 4
Communications Modules
●
Revised 19Sep2003
w w w. i c s t . c o m
●
tel (508) 852-5400
Integrated
Circuit
Systems, Inc.
M680-02
D
UAL
SAW, S
ELECTABLE
F
REQUENCY
VCSO
Preliminary Information
E
LECTRICAL
S
PECIFICATIONS
DC Characteristics
Unless stated otherwise, V
CC
= 3.3 Volts + 10%, T
A
= 0 to 85
o
C, VCSO Freq.’s = 622.08, 669.3265MHz, Outputs terminated into 180Ω to ground
Symbol Parameter
Pin
VCC
Min
2.97
Typ
3.3
90
Max
3.63
125
V
cc
Unit
Power Supply V
CC
I
CC
Control
Voltage
V
IN
Positive Supply Voltage
Power Supply Current
Input Control Voltage Range
V
IN
Input Impedence
V
IN
Modulation Bandwidth
V
mA
V
kΩ
kHz
0
VIN
100
600
2
Frequency
Select
1
V
IH
V
IL
I
IH
I
IL
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
F_SEL
V
cc
+
0.3
0.8
V
V
µA
µA
-
0.3
5
-1
50
51
V
cc
-
0.98
V
cc
-
0.75
V
cc
-
1.63
0.625
0.85
20
R
pulldown
Internal Pull-down Resistor
Differential
Outputs
V
OH
V
OL
V
P
-
P
I
OUT
Output High Voltage
Output Low Voltage
Peak to Peak Output Voltage
Output Current
FOUT, nFOUT
V
cc
-
1.95
0.450
kΩ
V
V
V
P
-
P
mA
Table 5: DC Characteristics
Note 1: Internally pulled down to Logic 0 (Frequency 1) if left unselected.
AC Characteristics
Unless stated otherwise, V
CC
= 3.3 Volts + 10%, T
A
= 0 to 85
o
C, VCSO Freq.’s = 622.08, 669.3265MHz, Outputs terminated into 180Ω to ground
Symbol Parameter
Min
500
Typ
Max
700
Unit
Notes
Frequency
F
OUT
APR
f
STAB
L
IN
K
VCO
Output Center Frequency Range
Absolute Pull-Range
1
Frequency Stability
Tuning Linearity
Average VCO Gain
Non-harmonic Spurious
SSB (single sideband)
Phase Noise, offset
from carrier
@
622.08
MHz
MHz
ppm
ppm p-p
%
ppm/V
dBc
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
ps rms
ps rms
%
ps
ps
20
% to
80
%
20
% to
80
%
Table 6: AC Characteristics
±
50
75
6
225
-50
100Hz Offset
1kHz Offset
10kHz Offset
100kHz Offset
1MHz Offset
-77
-40
-70
-99
-122
-142
0.37
0.19
45
275
275
55
400
400
V
IN
=
0.3
to
3.0
V
Best fit straight line
V
IN
=
0.3
to
3.0
V
Outputs
Φ
n
J(t)
odc
t
R
t
F
Jitter (rms)
Output Duty Cycle
2
12kHz to 20MHz
50kHz to 80MHz
Output Rise Time
2
for
FOUT, nFOUT
Output Fall Time
2
for
FOUT, nFOUT
Note 1: Consult ICS for availability of other APRs.
Note 2: See
Parameter Measurement Information
on
pg. 4.
M680-02 Datasheet Rev 1.0
Integrated Circuit Systems, Inc.
●
3 of 4
Communications Modules
●
Revised 19Sep2003
w w w. i c s t . c o m
●
tel (508) 852-5400
Integrated
Circuit
Systems, Inc.
M680-02
D
UAL
SAW, S
ELECTABLE
F
REQUENCY
VCSO
Preliminary Information
P
ARAMETER
M
EASUREMENT
I
NFORMATION
Output Rise and Fall Time
80%
Clock
Outputs
20%
t
R
80%
V
SWING
20%
t
F
Output Duty Cycle
nFOUT
FOUT
t
PW
(Output Pulse Width)
t
PERIOD
odc =
t
PW
t
PERIOD
Figure 3: Output Rise and Fall Time
Figure 4: Output Duty Cycle
D
EVICE
P
ACKAGE
-
5 x 7mm SMT (Surface Mount) Package
Mechanical Dimensions:
Dimensions are in mm;
dimensions in [ ] are in inches
Unless otherwise specified, all
dimensions are
±0.13
[0.005]
Figure 5: Device Package - 5 x 7mm SMT (Surface Mount) Package
O
RDERING
I
NFORMATION
For Output Frequencies (MHz)
Order Part Number
Standard Output Frequencies
AA
622.0800
AG
AB
AC
AD
AE
AF
625.0000
627.3296
644.5313
666.5143
669.1281
AH
AI
AJ
AK
AL
669.3120
669.3265
670.8386
672.1600
690.5692
693.4830
Frequency 1
,
Frequency 2
e.g., 622.0800, 669.3265
M680-02-Ax-Ax
M680-02-AA-AH
Table 7: Ordering Information
Table 8: Standard Output Frequencies
Consult ICS for the availability of other VCSO frequencies.
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS)
assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would
result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial
applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary
environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any
circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or
critical medical instruments.
M680-02 Datasheet Rev 1.0
Integrated Circuit Systems, Inc.
●
4 of 4
Communications Modules
●
Revised 19Sep2003
w w w. i c s t . c o m
●
tel (508) 852-5400
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