VTM3 series
Voltage Controlled Temperature Compensated Crystal Oscillator
Features
•
Small 3.2x2.5 package size
•
Clipped Sine Wave Output
•
Output Frequencies to 45 MHz
•
Fundamental Crystal Design
•
Optional VCXO Function available
•
Gold over nickel contact pads
•
Hermetically Sealed Ceramic SMD package
The VTM3, VCTXCO
•
Product is compliant to RoHS directive
and fully compatible with lead free assembly
Applications
•
GPS
•
WiMAX, Wi-Fi, Wi-LAN
•
Seismic Exploration
•
Point to point radios
•
Broadband Access
•
Test Equipment
•
PDA’s
Description
Vectron’s VTM3 Temperature Compensated
Crystal Oscillator (TCXO) is a quartz stabilized,
clipped sine wave output, analog temperature
compensated oscillator, operating off either a
2.8, 3.0, or 3.3 volt supply.
Vectron International: 267 Lowell Road, Suite 102, Hudson NH 03051
Tel: 1-88-VECTRON-1
e-mail: vectron@vectron.com
VTM3 Data Sheet
Performance Characteristics
Table 1. Electrical Performance
Parameter
Frequency
1
Typical Supply Voltage
Ordering option, see last page
Supply Current
8.000 MHz to < 20.000 MHz
20.000 MHz to < 32.00 MHz
32.000 MHz to 45.00 MHz
2
Output Level
Output Load
Control Voltage Impedance
Control Voltage to reach pull
All options (3.3,3.0 and 2.8V)
Pull Range
Ordering option, see last page
Temperature Stability
Ordering option, see last page.
Initial Accuracy, “No Adjust” option
Power Supply Stability
Load Stability
Aging
Operating temperature
Ordering option, see last page
Phase Noise, 12.000MHz
10 Hz offset
100 Hz offset
1 kHz offset
10 kHz offset
100 kHz offset
1 MHz offset
5 MHz offset
Start-up time
Symbol
f
O
Min
8.000
Maximum
45.000
2.8, 3.0, or 3.3
Typical
Units
MHz
Vdc
mA
1.5
2.0
2.5
Vp/p
Z
Vc
0.8
10K II 10pf
500
0.5
TPR
±5, ±8, ±10, ±15
±0.5 to ±5.0
±0.5
2.5
ppm
ppm
Kohm
V
V
I
DD
±1.0
ppm
±0.2
ppm
±0.2
ppm
±1.0
ppm/year
0/55, -10/60, -20/70, -30/80, -40/85
°C
dBc/Hz
-89
-117
-135
-148
-153
-154
-155
2
ms
1. A 0.01uF and a 0.1uF capacitor should be located as close to the supply as possible (to ground) is recommended.
2. Output is DC coupled
.
Vectron International: 267 Lowell Rd, Suite 102, Hudson NH 03051
Tel: 1-88-VECTRON-1
e-mail: vectron@vectron.com
VTM3 Data Sheet
Figure 2. Clipped Sine Wave Output
VCXO Functional Description
VCXO Feature:
The VTM3 can be ordered with a VCXO function for applications where it will be used in a
PLL, or the output frequency needs fine tune adjustments. This is a high impedance input, 0.5 Mohm, 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 devices.
“No Adjust” Feature:
In applications where the VTM3 will not be used in a PLL, or the output frequency
does not fine tune adjustments, the best device to use would be a VTM3-x0xx. By using the “no adjust”
option, the circuit is simplified as Vc does not need to 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 the supply).
Vectron International: 267 Lowell Rd, Suite 102, Hudson NH 03051
Tel: 1-88-VECTRON-1
e-mail: vectron@vectron.com
VTM3 Data Sheet
Outline Diagrams, Pad Layout and Pin Out
Pin 1,
Pin 2,
Pin 3,
Pin 4,
Pin 5,
Pin 6,
Pin 7,
Pin 8,
Ground or VC
NC
Ground
Output
NC
VCC
NC
NC
Contact Pads are gold over nickel
Devices will be marked with the frequency
Pin 2,5,6,7,8 are used to program and adjust the TCXO during manufacturing and should be left open; do
not terminate these to the supply voltage and are a “make no connection” pad.
Figure 3, Package drawing
Vectron International: 267 Lowell Rd, Suite 102, Hudson NH 03051
Tel: 1-88-VECTRON-1
e-mail: vectron@vectron.com
VTM3 Data Sheet
3.2
2 .5
0 .2
M RKING
A
1.0
max
#1
0 .65
0.85
#4
1.95
1.0
1 .25
2.6
LA
ND PATT
ERN
Contact Pads are gold over nickel
Devices will be marked with the frequency
C
Figure 4, Package drawing for ±0.5ppm over -30/80° and <±2ppm over -40/85°
C
Vectron International: 267 Lowell Rd, Suite 102, Hudson NH 03051
1.65
±
0.2
±
#
2
Pin 1, Ground or VC
Pin
TERMINAL
2, Ground
CONNECTION
Pin 3, Output
TCXO
VCTCXO
Pin 4, VCC
#1
#2
#3
#4
#3
0.55
GND
GND
Vcont
GND
OUTPUT
Vcc
OUTPUT
Vcc
Tel: 1-88-VECTRON-1
e-mail: vectron@vectron.com
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
