Vectron International • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
VT-490
Temperature Compensated Crystal Oscillator
Previous Vectron Model OSC
Vectron’s VT-490 Temperature Compensated Crystal Oscillator (TCXO) is a quartz stabilized, clipped sine wave output, analog
temperature compensated oscillator, operating o either 3.0 or 5.0 volt supply built on a 9.9x11.8 FR4 board with a cover.
Clipped Sine Wave Output•
Output Frequencies to 40 MHz •
Fundamental Crystal Design •
Optional VCXO Function available•
Gold over nickel contact pads •
SMD package•
Product is compliant to RoHS directive •
and fully compatible with lead free assembly
Wireless Communications•
Base Stations•
Point to point radios•
Broadband Access•
Test Equipment•
Features
Applications
Block Diagram
Description
VT-490
Page1
V
DD
Output
Vcontrol or NC
Gnd
Analog
Temperature
Comp.
Crystal
Vectron International • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Page2
Performance Specications
Table 1. Electrical Performance
Parameter Symbol Min. Typ Max Units
Output Frequency f
O
10 40 MHz
Supply Voltage
1
V
DD
+3.0 or +5.0 V
Supply Current, 8-16.800MHz
16.801-25.9999MHz
26.000-40.000MHz
I
DD
2.0
3.0
4.0
mA
Operating Temperature, (Ordering Option) T
OP
-20/70, -30/80, -40/85 °C
Stability Over T
OP
, (Ordering Option) ±1.5, ±2.0, ±2.5, ±5.0 ppm
Initial Accuracy, “No Adjust” Option ±1.0 ppm
Power Supply Stability, 10-16.800MHz
16.801-25.9999MHz
26.000-40.000MHz
±0.3
±0.5
±1.0
ppm
Load Stability ±0.5 ppm
Aging ±1 ppm/yr
Pull Range,
3
Mechanical Trim Only
Electrical and Mechanical Trim
Electrical Trim only
TPR
±8
±5
±8
ppm
Control Voltage to reach Pull Range, 5V
3.0V option
0.5
0.5
4.5
2.5
V
Control Voltage Impedance 100 Kohm
Output Level
2,
, 5V option
3.0V option
V
O
p/p 1.0
0.7
V
Output Load 10K II 10pF
Phase Noise, 10.000MHz
10Hz
100Hz
1kHz
10kHz
100kHz
-100
-123
-133
-143
-151
dBc/Hz
Start Up Time 10 ms
1. The VT-490 power supply pin should be ltered, 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
Table 2. Pinout
Pin # Symbol Function
1 V
C
TCXO Control Voltage or Ground
2 GND Electrical and Lid Ground
3 f
o
Output Frequency
4 V
DD
Supply Voltage
1.4
1.9
8.4
7.62
Outline Drawing
Recommended Pad Layout