Vectron’s VT-490 Temperature Compensated Crystal Oscillator (TCXO) is a quartz stabilized, clipped sine wave output, analog
temperature compensated oscillator, operating off either 3.0 or 5.0 volt supply built on a 9.9x11.8 FR4 board with a cover.
Features
•
•
•
•
•
•
Clipped Sine Wave Output
Output Frequencies to 40 MHz
Fundamental Crystal Design
Optional VCXO Function available
Gold over nickel contact pads
SMD package
•
•
•
•
•
Applications
Wireless Communications
Base Stations
Point to point radios
Broadband Access
Test Equipment
• Product is compliant to RoHS directive
and fully compatible with lead free assembly
Block Diagram
V
DD
Crystal
Output
Analog
Temperature
Comp.
Vcontrol or NC
Gnd
Vectron International • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
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Performance Specifications
Table 1. Electrical Performance
Parameter
Output Frequency
Supply Voltage
1
Supply Current, 8-16.800MHz
16.801-25.9999MHz
26.000-40.000MHz
Operating Temperature, (Ordering Option)
Stability Over T
OP
, (Ordering Option)
Initial Accuracy, “No Adjust” Option
Power Supply Stability, 10-16.800MHz
16.801-25.9999MHz
26.000-40.000MHz
Load Stability
Aging
Pull Range,
3
Mechanical Trim Only
Electrical and Mechanical Trim
Electrical Trim only
Control Voltage to reach Pull Range, 5V
3.0V option
Control Voltage Impedance
Output Level
2,
, 5V option
3.0V option
Output Load
Phase Noise, 10.000MHz
10Hz
100Hz
1kHz
10kHz
100kHz
Start Up Time
1. The VT-490 power supply pin should be filtered, eg, a 0.1 and 0.01uf capacitor
2. The Output is AC coupled
3. A special trim tool, KMTZ04, should be used to adjust the frequency
-100
-123
-133
-143
-151
10
V
O
p/p
TPR
±8
±5
±8
0.5
0.5
100
1.0
0.7
10K II 10pF
dBc/Hz
4.5
2.5
Symbol
f
O
V
DD
I
DD
Min.
10
Typ
+3.0 or +5.0
Max
40
2.0
3.0
4.0
Units
MHz
V
mA
T
OP
-20/70, -30/80, -40/85
±1.5, ±2.0, ±2.5, ±5.0
±1.0
±0.3
±0.5
±1.0
±0.5
±1
°C
ppm
ppm
ppm
ppm
ppm/yr
ppm
V
Kohm
V
ms
Outline Drawing
Recommended Pad Layout
1.9
1.4
7.62
8.4
Table 2. Pinout
Pin #
1
2
3
4
Page2
Symbol
V
C
GND
f
o
V
DD
Function
TCXO Control Voltage or Ground
Electrical and Lid Ground
Output Frequency
Supply Voltage
Vectron International • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
VCXO Function
VCXO Feature:
The VT-490 can be ordered with a VCXO function for applications were it will be used in a PLL, or the output
frequency needs fine tune or calibration adjustments. This is a high impedance input , 1Mohm, and can be driven with an op-amp
or terminated with adjustable resistors etc.
Pin 1 should not be left floating on the VCXO optional device.
S
“No Adjust” Option:
In applications were the VT-490 will not be used in a PLL , or the output frequency does not need fine tune
adjustments, the best device to use would be a VT-490-xxx-xxx0. By using the “no adjust” option, the circuit is simplified as Vc
does not need to be adjusted or set to a predetermined voltage and pin 1 should be grounded (pin 1 can be left open but should
not be set to a voltage such as an RF signal or power supply voltage.
Phase Noise
Output Waveform
Absolute Maximum Ratings and Handling Precautions
Stresses in excess of the absolute maximum ratings can permanently damage the device. Functional operation is not implied or any other
excess of conditions represented in the operational sections of this data sheet. Exposure to absolute maximum ratings for extended
periods may adversely affect device reliability.
S
Although ESD protection circuitry has been designed into the VT-490, proper precautions should be taken when handling and mounting,
VI employs a Human Body Model and Charged Device Model for ESD susceptibility testing and design evaluation.
ESD thresholds are dependent on the circuit parameters used to define the model. Although no industry standard has been adopted for
the CDM a standard resistance of 1.5kOhms and capacitance of 100pF is widely used and therefor can be used for comparison purposes.
Table 3. Maximum Ratings
Parameter
Storage Temperature
Supply Voltage
Control Voltage
ESD, Human Body Model
ESD, Charged Device Model
-
Maximum Ratings
Symbol
T
STORE
V
DD
V
C
Rating
-55/125
6
0/V
DD
1500
1000
Unit
ºC
V
V
V
V
Vectron International • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Page3
Table 4. Environmental Compliance
Parameter
Mechanical Shock
Mechanical Vibration
Temperature Cycle
Solderability
Fine and Gross Leak
Resistance to Solvents
Moisture Sensitivity Level
Contact Pads
Condition
MIL-STD-883 Method 2002
MIL-STD-883 Method 2007
MIL-STD-883 Method 1010
MIL-STD-883 Method 2003
MIL-STD-883 Method 1014
MIL-STD-883 Method 2015
MSL1
Gold over Nickel
IR Reflow
Suggested IR Profile
Devices are built using lead free epoxy and can be
subjected to standard lead free IR reflow conditions
shown in Table 5. Contact pads are gold over nickel and
lower maximum temperatures can also be used, such as
220C.
Table 5. Reflow Profile
Parameter
PreHeat Time
Ts-min
Ts-max
Ramp Up
Time above 217C
Time to Peak Temperature
Time at 260C
Time at 240C
Ramp down
S
Symbol
t
s
Value
200 sec Max
150°C
200°C
3ºC/sec Max
150 sec Max
480 sec Max
10 sec Max
60 sec Max
6ºC/sec Max
R
UP
t
L
t
25C to peak
t
P
t
P2
R
DN
Tape and Reel Information
Table 6. Tape and Reel Information
Tape Dimensions (mm)
W
16
F
7.5
Do
1.5
Po
4
P1
8
A
180
B
1.5
Reel Dimensions (mm)
C
13
D
20.2
N
60
W1
16.4
W2
20.4
#/Reel
1000
Vectron International • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Page4
Table 7. Standard Frequencies (MHz)
10.000
15.000
19.200
24.5454
40.000
10.245
16.000
19.440
24.5535
12.504
16.325291
19.6608
24.576
12.800
16.36625
19.680
25.000
13.000
16.367667
19.800
25.600
13.568
16.3683
20.000
26.000
14.000
16.396
20.910
27.000
14.31818
16.800
21.250
27.456
14.4844
17.500
23.104
28.800
14.7456
18.414
24.000
32.768
Ordering Information
VT- 490- F F J - 206 A- xxMxxxxxxx
Frequency in MHz
Product
TCXO
Package
9.9x11.8, FR4, trim
Voltage Options
D: +5.0 Vdc ±5%,
F: +3.0 Vdc ±5%
Output
F: Clipped Sine Wave
Temp Range
J: -20/70°C
G: -30/80°C
E: -40/85°C
Tuning
0: Fixed, Mechanical tuning only
A: ±5ppm Mechanical and Electrical
B: ±8ppm Electrical tuning only
Stability
156: ±1.5ppm
206: ±2.0ppm
256: ±2.5ppm
506: ±5.0ppm
*Note: not all combination of options are available.
Other specifications may be available upon request.
Example: VT-490-FFJ-206A-19M2000000
Vectron International
267 Lowell Road, Suite 102
Hudson, NH 03051
Tel: 1.888.328.7661
Fax: 1.888.329.8328
USA:
Vectron International
Landstrasse, D-74924
Neckarbischofsheim, Germany
Tel: +49 (0) 3328.4784.17
Fax: +49 (0) 3328.4784.30
Europe:
Vectron International
68 Yin Cheng Road (C), 22
nd
Floor
One LuJiaZui
Pudong, Shanghai 200120, China
Tel: 86.21.6194.6886
Fax: 86.21.6194.6699
Asia:
Disclaimer
Vectron International reserves the right to make changes to the product(s) and or information contained herein without notice. No liability is assumed as a result of their use or application.
No rights under any patent accompany the sale of any such product(s) or information.
Rev: 02/11/2014
Vectron International • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
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