OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

M685-02-AE-AH

P1-P3P4-P6P7-P7
M685 Datasheet Rev 0.7 Revised 29Jul2009
Integrated Device Technology, Inc. ● Communication Modules ● www.idt.com ● tel (508) 852-5400
M685
D
UAL
SAW, S
ELECTABLE
F
REQUENCY
VCSO
Preliminary Information
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 177 MHz.
The M685-02 provides 500 to 708 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).
F
EATURES
◆ Two integrated SAW devices and selectable output
frequency; supports multi-rate optical interfaces
◆ M685-01 output frequencies from 125 to 177 MHz
M685-02 output frequencies from 500 to 708 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
◆ Pb-free / Compliant to EC RoHS Directive
P
IN
A
SSIGNMENT
(5 x 7.5mm SMT)
Figure 1: Pin Assignment
B
LOCK
D
IAGRAM
Figure 2: Block Diagram
Sample of Available Output Frequencies
VCSO Center
Frequencies
1
(MHz)
Note 1: Specify VCSO center frequencies at time of order
Applications
155.5200, 167.3316 SONET/SDH, SONET/SDH FEC
156.2500, 161.1328 Gigabit Ethernet, GbE FEC
622.0800, 669.3266 SONET/SDH, SONET/SDH FEC
625.0000, 644.5313 Gigabit Ethernet, GbE FEC
Table 1: Sample of Available Output Frequencies
M680
(Top View)
1
2
34
5
6
VIN
F
_SEL
VCC
nFO
U
GND FOU
T
M685
F_SEL
VIN
nFOUT
SAW Delay Line
Phase
Shifter
M685
VCSO
FOUT
SAW Delay Line
Phase
Shifter
VCSO
M685 Dual SAW, Selectable Frequency VCSO
M685 Datasheet Rev 0.7 2 of 7 Revised 29Jul2009
Integrated Device Technology, Inc. ● Communication Modules ● www.idt.com ● tel (508) 852-5400
M685
D
UAL
SAW, S
ELECTABLE
F
REQUENCY
VCSO
Preliminary Information
P
IN
D
ESCRIPTIONS
Number Name
I/O
Configuration Description
1VIN
Input Frequency control input.
2 F_SEL
Input Internal pull-down resistor
1
Frequency select:
Logic
1
selects Frequency 2
.
Logic
0
selects Frequency 1
.
3GND
Ground Power supply ground connection.
4
5
FOUT
nFOUT
Output No internal terminator Clock output pair. Differential LVPECL.
6VCC
Power Power supply connection, connect to +
3.3
V.
Table 2: Pin Descriptions
Note 1: See “Frequency Select” in Table 5 (DC Characteristics for M685-01 on pg. 3) and Table 7 (DC Characteristics for M685-02 on pg. 4).
A
BSOLUTE
M
AXIMUM
R
ATINGS
1
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
.
Symbol Parameter Rating Unit
V
I
Inputs -
0.5
to V
CC
+
0.5
V
V
O
Outputs -
0.5
to V
CC
+
0.5
V
V
CC
Power Supply Voltage
4.6
V
T
S
Storage Temperature -
55
to +
125
o
C
Table 3: Absolute Maximum Ratings
R
ECOMMENDED
C
ONDITIONS
OF
O
PERATION
Symbol Parameter Min Typ Max Unit
V
CC
Positive Supply Voltage
2.97 3.3 3.63
V
T
A
Ambient Operating Temperature
-
40 25
+
85
o
C
Table 4: Recommended Conditions of Operation
M685 Datasheet Rev 0.7 3 of 7 Revised 29Jul2009
Integrated Device Technology, Inc. ● Communication Modules ● www.idt.com ● tel (508) 852-5400
M685
D
UAL
SAW, S
ELECTABLE
F
REQUENCY
VCSO
Preliminary Information
E
LECTRICAL
S
PECIFICATIONS
FOR
M685-01
DC Characteristics for M685-01
Unless stated otherwise, V
CC
= 3.3 Volts + 10%, T
A
= 0 to 85
o
C, VCSO Freq.’s = 155.52, 167.3316MHz, Outputs terminated into 180
Ω
to ground
Symbol Parameter Pin Min Typ Max Unit
Power Supply V
CC
Positive Supply Voltage
VCC
2.97 3.3 3.63
V
I
CC
Power Supply Current
90 125
mA
Control
Voltage
V
IN
Input Control Voltage Range
VIN
0 3.3
V
V
IN
Input Impedence
100
kΩ
Frequency
Select
1
Note 1: Internally pulled down to Logic 0 (Frequency 1) if left unselected.
V
IH
Input High Voltage
F_SEL
2
V
cc
+
0.3
V
V
IL
Input Low Voltage -
0.3
0.8
V
I
IH
Input High Current 5 µA
I
IL
Input Low Current -1
50
µA
R
pulldown
Internal Pull-down Resistor
51
kΩ
Differential
Outputs
V
OH
Output High Voltage
FOUT, nFOUT
V
cc
-
0.98 V
cc
-
0.75
V
V
OL
Output Low Voltage
V
cc
-
1.95 V
cc
-
1.63
V
V
P
-
P
Peak to Peak Output Voltage
2
Note 2: Single-ended measurement. See Figure 3, Output Rise and Fall Time, on pg. 5.
0.450 0.625 0.85
V
P
-
P
I
OUT
Output Current
20
mA
Table 5: DC Characteristics for M685-01
AC Characteristics for M685-01
Unless stated otherwise, V
CC
= 3.3 Volts + 10%, T
A
= 0 to 85
o
C, VCSO Freq.’s = 155.52, 167.3316MHz, Outputs terminated into 180
Ω
to ground
Symbol Parameter Min Typ Max Unit
Notes
Control Voltage V
IN
Modulation Bandwidth
VIN
600
kHz
Output F
OUT
Output Center Frequency Range
M685-01 125 177
MHz
APR Absolute (Guaranteed) Pull-Range
1
Note 1: Also fully meets ±50 ppm minimum pull-range specification that is commonly required.
±
120
ppm
f
STAB
Frequency Stability
100
ppm p-p
At any givin V
IN
L
IN
Tuning Linearity
6
%
V
IN
=
0.3
to
3.0
V
Best fit straight line
K
VCO
VCO Gain
@
155.52
MHz
400
ppm/V
V
IN
=
0.3
to
3.0
V
Non-harmonic Spurious
-50 -77
dBc
Φ
n SSB (single sideband)
Phase Noise, offset
from carrier
@
155.52
MHz
100Hz Offset -48
dBc/Hz
1kHz Offset -75
dBc/Hz
10kHz Offset -99
dBc/Hz
100kHz Offset -124
dBc/Hz
1MHz Offset -142
dBc/Hz
J(t) Jitter (rms)
@
155.52
MHz
12kHz to 20MHz 0.30
ps rms
50kHz to 80MHz 0.18
ps rms
odc Output Duty Cycle
2
Note 2: See Parameter Measurement Information on pg. 5.
45 55
%
t
R
Output Rise Time
2
for
FOUT,
nFOUT
275 425
ps
20
% to
80
%
t
F
Output Fall Time
2
for
FOUT,
nFOUT
275 425
ps
20
% to
80
%
Table 6: AC Characteristics for M685-01
P1-P3P4-P6P7-P7

M685-02-AE-AH

Mfr. #:
Buy M685-02-AE-AH
Manufacturer:
IDT
Description:
Clock Synthesizer / Jitter Cleaner DUAL VCSO
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet