VS-751
Dual Frequency VCSO
VS-751
Description
The VS-751 is a SAW based voltage controlled oscillator that operates at the fundamental frequencies of the internal SAW filters.
These SAW filters are high-Q quartz devices that enable the circuit to achieve low phase jitter performance over a wide operating
temperature range. The dual oscillator is housed in a hermetically sealed leadless surface mount package offered on tape and
reel. It has a frequency select function that enables either “Frequency 1” or “Frequency 2.”
Features
•
•
•
•
•
•
•
•
•
5x7.5x2.5 mm Package
Output frequencies from 500MHz to 850MHz
3.3V operation
Low Jitter <0.25 ps-rms across 50kHz to 80MHz
LV-PECL configuration with fast transition times
Complementary outputs
Frequency select
Patent pending technology
Product is free of lead and compliant to EC RoHS directive
Applications
PLL circuits for clock smoothing and frequency translation
Description
Standard
• 1-2-4 Gigabit Fibre Channel
INCITS 352-2002
• 10 Gigabit Fibre Channel
INCITS 364-2003
• 10GbE LAN / WAN
IEEE 802.3ae
• OC-192
ITU-T G.709
• SONET / SDH
GR-253-CORE Issue4
• Synchronous Ethernet
ITU-T.8262
Block Diagram
Vcc
COutput
Output
SAW 1
SAW 2
Vc
FS
Gnd
Page1 of 8
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Rev: 11/12/2009
Performance Specifications
Electrical Performance
Parameter
Voltage
Current (No Load)
Symbol
V
CC
I
CC
Min
Supply
2.97
Typical
3.3
55
Maximum
3.63
70
Units
V
mA
Notes
2,3
3
Frequency
Nominal Frequency
Absolute Pull Range
Linearity
Gain Transfer (See pg 5)
Temperature Stability
Transition Time
f
N
APR
Lin
±50
500 - 850
±5
+405
±100
4
MHz
ppm
%
ppm/V
ppm
μsec
1,2,3
1,2,3,8
2,4,8
2,8
1,6
6
1,3
2,3
6
5,6
5,6
2,3
6
6,7
K
V
f
STAB
Outputs
Mid Level
Swing
Current
Rise Time
Fall Time
Symmetry
Spurious Suppression
Jitter (See pg 5)
V
CC
-1.4
550
V
CC
-1.3
650
250
250
V
CC
-1.2
950
20
400
400
55
0.250
V
mV-pp
mA
ps
ps
%
dBc
ps-rms
I
OUT
t
R
t
F
SYM
45
50
50
60
0.130
фJ
Z
C
BW
Control Voltage
Input Impedance
Modulation Bandwidth
Operating Temperature
Package Size
1]
2]
3]
4]
5]
6]
7]
8]
100
500
-40
5.0 x 7.5 x 2.5
85
kΩ
kHz
°C
mm
6
6
1,3
T
OP
See standard frequencies and ordering information (Pg 7).
Parameters are tested with production test circuit below (Fig 1).
Parameters are tested at ambient temperature with test limits guardbanded for specified operating temperature.
Measured as the maximum deviation from the best straight-line fit, per MIL-0-55310.
Measured from 20% to 80% of a full output swing (Fig 2).
Not tested in production, guaranteed by design, verified at qualification.
Integrated across 50kHz to 80MHz, per GR-253-CORE Issue3.
Tested with Vc = 0.3V to 3.0V.
Fig 1: Test Circuit
Fig 2: 10K LV-PECL Waveform
Test Circuit Notes:
1)
To permit 50Ω easurement of outputs, all DC inputs are biased down 1.3V.
2)
All voltage sources contain bypass capacitors to minimize supply noise.
3)
50Ω terminations are within test equipment.
Page2 of 8
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Rev: 11/12/2009
Absolute Maximum Ratings
Parameter
Power Supply
Input Current
Output Current
Voltage
Storage Temperature
Soldering Temperature / Duration
Symbol
V
CC
I
IN
I
OUT
V
C
T
STR
T
PEAK
/ t
P
Ratings
0 to 6
100
25
0 to V
CC
-55 to 125
260 / 40
Unit
V
mA
mA
V
°C
°C / sec
Stresses in excess of the absolute maximum ratings can permanently damage the device. Also, exposure to these absolute
maximum ratings for extended periods may adversly affect device reliability. Functional operation is not implied at these or any
other conditions in excess of those represented in the operational sections of this datasheet. Permanent damage is also possible
if any device input (Vc or FS) draws greater than 100mA.
Suggested Output Load Configuration
LV-PECL to LV-PECL:
For short transmission lengths, the power
consumption could be reduced by removing the 100Ω resistor and
doubling the value of the pull down resistors.
LV-PECL to LVDS:
Restricted for short transmission lengths.
Configuration may require modification depending on LVDS receiver.
Functional Test:
Allows standard power supply configuration.
Since AC coupled, the LV-PECL levels cannot be measured.
Production Test:
Allows direct DC coupling into 50Ω measurement
equipment. Must bias the power supplys as shown. Similiar to Figure 1.
Page3 of 8
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Rev: 11/12/2009
Typical Characteristics
Page4 of 8
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Rev: 11/12/2009
Reliability
VI qualification includes aging at various extreme temperatures, shock and vibration, temperature cycling, and IR reflow
simulation. The VS-751 family is capable of meeting the following qualification test at right:
Environmental Compliance
Parameter
Mechanical Shock
Mechanical Vibration
Solderability
Gross and Fine Leak
Resistance to Solvents
Conditions
MIL-STD-883, Method 2002
MIL-STD-883, Method 2007
MIL-STD-883, Method 2003
MIL-STD-883, Method 1014
MIL-STD-883, Method 2016
Handling Precautions
Although ESD protection circuitry has been designed into the VS-751 proper precautions should be taken when handling and
ounting. VI employs a human body model (HBM) and a charged-device model (CDM) for ESD susceptibility testing and design
protection evaluation.
ESD Ratings
Model
Human Body Model
Charged Device Model
Minimum
1500V
1000V
Conditions
MIL-STD-883, Method 3015
JEDEC, JESD22-C101
Reflow Profile (IPC/JEDEC J-STD-020C)
Parameter
PreHeat Time
Ramp Up
Time Above 217 °C
Time To Peak Temperature
Time at 260 °C
Ramp Down
Symbol
t
S
R
UP
t
L
T
AMB-P
t
P
R
DN
Value
60 sec Min, 180 sec Max
3 °C/sec Max
60 sec Min, 150 sec Max
480 sec Max
20 sec Min, 40 sec Max
6 °C/sec Max
The device has been qualified to meet the JEDEC standard
for Pb-Free assembly. The temperatures and time intervals
listed are based on the Pb-Free small body requirements.
The temperatures refere to the topside of the package,
measured on the package body surface. The VS-751 device is
hermetically sealed so an aqueous wash is not an issue.
Terminal Plating: Electroless Gold Plate over Nickel Plate
Page5 of 8
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Rev: 11/12/2009
