VT-820
Temperature Compensated Crystal Oscillator
Previous Vectron Model VTM3
VT-820
Description
Vectron’s VT-820 Temperature Compensated Crystal Oscillator (TCXO) is a quartz stabilized, clipped sine wave output, analog
temperature compensated oscillator, operating off either 1.8, 2.8, 3.0 or 3.3 volt supply in a hermetically sealed 3.2x2.5mm
ceramic package.
Features
•
•
•
•
•
•
±0.5ppm
Temperature Stability
Clipped Sine Wave Output
Output Frequencies to 45 MHz
Fundamental Crystal Design
Optional VCXO Function available
Hermetically Sealed Ceramic SMD package
•
•
•
•
•
•
•
•
•
Applications
GPS
WiMAX, Wi-Fi,Wi-LAN
Seismic Exploration
Wireless Communications
Base Stations
Point to point radios
Broadband Access
Test Equipment
Handsets
• 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
(Ordering Option)
Supply Current, 8 to 19.999MHz
20.000 to 31.9999MHz
32.000 to 45.000MHz
Operating Temperature, (Ordering Option)
Stability Over T
OP
, (Ordering Option)
Initial Accuracy
2
, “No Adjust” Option
Power Supply Stability, ±5% change
Load Stability
Aging
Pull Range, (Ordering Option)
Control Voltage to reach Pull Range
1.8V option
Control Voltage Impedance
Output Level
3
Output Load
Phase Noise, 10.000MHz
10Hz
100Hz
1kHz
10kHz
100kHz
Start Up Time
1. The VT-820 power supply pin should be filtered, eg, a 0.1 and 0.01uf capacitor.
2. Initial Accuracy is before IR reflow. Allow another 1ppm shift through 2 reflows and 24 hours.
3. The Output is DC coupled.
-91
-116
-137
-149
-150
2
ms
V
O
p/p
TPR
0.5
0.3
500
0.8
10K II 10pF
dBc/Hz
±5, ±8, ±10, ±12, ±15
2.5
1.5
Symbol
f
O
V
DD
I
DD
Min.
8
Typ
+1.8, 2.8, +3.0 or +3.3
Max
45
1.5
2.0
2.5
Units
MHz
V
mA
T
OP
0/55, -10/60, -20/70, -30/80, -30/85, -40/85
±0.5, ±1.0, ±1.5, ±2.0, ±2.5, ±3.0, ±3.5 ±4.0, ±5.0
±1.0
±0.2
±0.2
±1.0
°C
ppm
ppm
ppm
ppm
ppm/yr
ppm
V
V
Kohm
V
Outline Drawing
Dimensions in mm
Description
Frequency
Date Code
Frequency
Date Code
Page2
Pinout and Recommended Pad Layout
1.0
Table 2. Pinout
Pin #
1
2
3
4
Symbol
V
C
GND
f
o
V
DD
Function
TCXO Control Voltage or Ground
Electrical and Lid Ground
Output Frequency
Supply Voltage
2.30
Dimensions in mm
1.25
1.65
VCXO Function
S
VCXO Feature:
The VT-820 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, 500KMohm, 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-820 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-820-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.
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-820, 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
Symbol
T
STORE
V
DD
V
C
Rating
-40/85
6
0/V
DD
1000
1000
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
Page3
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 Compliance
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
Ramp Up
Time above 217°C
Time to Peak Temperature
Time at 260°C
Time at 240°C
Ramp down
Symbol
ts
R
UP
tL
tAMB-P
tP
tP2
R
DN
Value
200 sec Max
3°C/sec Max
150 sec Max
480 sec Max
30 sec Max
60 sec Max
6°C/sec Max
Tape & Reel
Table 6. Tape and Reel Information
Tape Dimensions (mm)
W
18
F
1.75
Do
1.55
Po
4
P1
4
A
178
B
2.5
Reel Dimensions (mm)
C
13
D
22
N
60
W1
11.5
W2
15
#/Reel
1000
Table 7. Standard Frequencies (MHz)
8.1920
15.000
19.200
25.000
39.000
10.000
16.000
19.392658
26.000
40.000
10.250
16.3670
19.440
27.000
41.4720
12.000
16.366667
19.6608
27.4560
45.000
12.800
16.367667
19.680
30.150
13.000
16.367673
20.000
30.400
13.568
16.368
20.7360
30.720
14.000
16.369
22.000
31.7967590
14.7456
16.736
23.104
37.800
15.360
16.800
24.5535
38.400
Page4
Ordering Information
VT-820- E F G - 206 A- xxMxxxxxxx
Frequency in MHz
Product
TCXO
Package
2.5x3.2
Voltage Options,
E: +3.3 Vdc ±5%,
F: +3.0 Vdc ±5%
G: +2.8 Vdc ±5%
J: +1.8 Vdc ±5%
Output
F: Clipped Sine Wave
Temp Range
R: 0 /55°C
K: -10/60°C
J: -20/70°C
G: -30/80°C
H: -30/85°C
E: -40/85°C
Tuning
0: Fixed, No tuning
A: ±5ppm
B: ±8ppm
C: ±10ppm
D: ±12ppm
E: ±15ppm
Stability
507: ±0.5ppm
106: ±1ppm
156: ±1.5ppm
206: ±2.0ppm
256: ±2.5ppm
306: ±3.0ppm
356: ±3.5ppm
406: ±4.0ppm
506: ±5.0ppm
*Note: not all combination of options are available.
Other specifications may be available upon request.
Example: VT-820-EFG-206A-19M200000
*
Add
_SNPBDIP
for tin lead solder dip
Example: VT-820_EFG-206A-19M2000000_SNPBDIP
Page5
DSP 与 ARM 处理器
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
