VT-501
Temperature Compensated Crystal Oscillator
Previous Vectron Model VTD3
VT-501
Description
Vectron’s VT-501 Temperature Compensated Crystal Oscillator (TCXO) is a quartz stabilized, CMOS output, analog temperature
compensated oscillator, operating off either 3.3 or 5.0 volt supply, 9.9x11.8 FR4 board with a nickel cover.
Features
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•
•
•
CMOS Output
Output Frequencies to 61.440 MHz
Fundamental Crystal Design
Optional VCXO Function available
Gold over nickel contact pads
Hermetically Sealed Ceramic SMD package
•
•
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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, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Page1
Performance Specifications
Specifications
Table 1. Electrical Performance
Parameter
Output Frequency
Supply Voltage
1
Supply Current, 8-22MHz
>22MHz
Operating Temperature,
ordering option
Stability Over T
OP
,
ordering option
Initial Accuracy, “No Adjust” Option
Power Supply Stability
Load Stability
Aging
Pull Range
Control Voltage to reach Pull Range, 5V
3.3V option
Control Voltage Impedance
Output Level
2
Output High
Output Low
Output High Drive
Output Low Drive
Output Load
Duty Cycle
Phase Noise, 10.000MHz
10Hz
100Hz
1kHz
10kHz
100kHz
Start Up Time
1. The VT-501 power supply pin should be filtered, eg, a 0.1 and 0.01uf capacitor
2. The Output is DC coupled
3. Duty Cycle is On Time/Period, see Figure 2. Test Circuit is shown in Figure 1.
-107
-138
-148
-152
-154
10
ms
V
OH
V
OL
I
OH
I
OL
TPR
0.5
0.3
100
0.9*V
DD
0.1*V
DD
-4
4
15
40/60
±5, ±8, ±10, ±12, ±15
4.5
3.0
Symbol
f
O
V
DD
I
DD
T
OP
Min.
8
Typ
+3.3 or +5.0
Max
61.440
15
24
Units
MHz
V
mA
°C
ppm
ppm
ppm
ppm
ppm/yr
ppm
V
kohm
V
V
mA
mA
pF
%
dBc/Hz
0/55, -10/60, -20/70, -30/80, -40/85
±1.0, ±1.5, ±2.0, ±2.5, ±3.0, ±4.0, ±5.0
±2.0
±1.0
±0.3
±1.0
Outline Drawing
9.9
1.3±0.1
Description
0.7
Recommended Pad Layout
1.9
7.62
Frequency
Date Code
1.4
11.8
7.62
1.2±0.1
8.4
Dimensions in mm
2.2
1.4
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, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Test Circuit
t
R
V
OH
4
+
V
DD
-
.1μF
.01μF
I
C
V
C
1
+
-
Period
3
2
15pF
On Time
50%
V
OL
t
F
I
DD
Figure 1 Test Circuit
Figure 2 Duty Cycle, On Time/Period
Phase Noise and Alan Deviation Plot
Figure 3 Phase Noise Plot for a 10.000MHz output
Figure 4 Alan Deviation Plot for a 10.000MHz output
VCXO Function
S
VCXO Feature:
The VT-501 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.
“No Adjust” Option:
In applications were the VT-501 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-501-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.
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Page3
Maximum Ratings
S
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.
Although ESD protection circuitry has been designed into the VT-501, 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.
The
Reliability
Table 3. Maximum Ratings
Parameter
Storage Temperature
Supply Voltage
Control Voltage
ESD, Human Body Model
ESD, Charged Device Model
Symbol
T
STORE
V
DD
V
C
Rating
-40/85
7
0/V
DD
1000
500
Unit
ºC
V
V
V
V
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
S
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
Symbol
t
s
Ts-min
Ts-max
R
UP
t
L
t
25-PEAK
t
P
t
P2
R
DN
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
Ramp Up
Time above 217C
Time to Peak Temperature
Time
at
260C
Time at 240C
Ramp down
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Page4
IR Reflow
Tape & Reel
Table 6. Tape and Reel Information
Tape Dimensions (mm)
W
24
F
11.5
Do
1.5
Po
4
P1
16
A
330
B
2
Reel Dimensions (mm)
C
13
D
21
N
80
W1
24.4
W2
28.4
#/Reel
1000 or
2000
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Page5
嵌入式系统
