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 a 3.3 or 5.0 volt supply in a 9.9 x 11.8mm FR4 board with nickel cover.
Features
•
•
•
•
•
•
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
•
•
•
•
•
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
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
Description
Recommended Pad Layout
1.9
7.62
1.4
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
Test Circuit
t
R
V
OH
4
+
V
DD
-
.1µF
.01µF
I
C
V
C
1
+
-
Period
3
2
15pF
50%
V
OL
On Time
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.
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, Vectron 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.
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
Weight
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 ( 0.03 um) over Nickel (3um - 5um)
460 mg
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
60 sec Min, 260 sec Max
150°C
200°C
3ºC/sec Max
60 sec Min, 150 sec Max
480 sec Max
30 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
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
500
Page5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
