VTC4 series
Voltage Controlled Temperature Compensated Crystal Oscillator
The VTC4, VCTXCO
Features
? Clipped Sine Wave Output ? Output Frequencies to 27 MHz ? Fundamental Crystal Design ? Optional VCXO Function available ? Gold over nickel contact pads
? Hermetically Sealed Ceramic SMD package
? Product is compliant to RoHS directive and fully compatible with lead free assembly
Applications
? Wireless Communications ? Base Stations
? Point to point radios ? Broadband Access
? Test Equipment ? Handsets
Description
Vectron’s VTC4 Temperature Compensated Crystal Oscillator (TCXO) is a quartz stabilized, clipped sine wave output, temperature
compensated oscillator, operating off either 2.8, 3.0, 3.3 or 5.0 volt supply.
VTC4 Data Sheet
Performance Characteristics
Table 1. Electrical Performance for the Clipped Sine Wave Output Option
Parameter Symbol Min Typical Maximum Units Frequency f O10.000 27.000 MHz Typical Supply Voltage
Ordering option, see last page
2.8V,
3.0V, 3.3V or 5.0V
Supply Current
10.000 MHz to < 15.000 MHz 15.000 MHz to 27.00 MHz I DD
1.5
2.0
mA
Output Level Vp/p 0.8 V Output Load 10K II 10pf
Control Voltage Impedance Z Vc 1 Mohm Control Voltage to reach pull
All options (5.0, 3.3,3.0 and 2.8V)0.5 2.5
V
Pull Range
Ordering option, see last page
TPR ±5, ±8, ±10, ±15 or ±20 ppm
Temperature Stability
Ordering option, see last page.
±0.5 to ±5.0 ppm Initial Accuracy, “No Adjust” option ±0.5 ppm Power Supply Stability ±0.2 ppm Load Stability ±0.2 ppm Aging ±1.0 ppm/year Operating temperature
Ordering option, see last page
0/55, -10/60, -20/70, -30/80, -40/85 °C Phase Noise, 12.800MHz
10 Hz offset 100 Hz offset 1 kHz offset 10 kHz offset 100 kHz offset 5MHz offset -89
-113
-137
-150
-155
-156
dBc/Hz
Start-up time 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.
VTC4 Data Sheet
Figure 1. Typical Phase Noise Plot
Figure 2. Clipped Sine Wave Output
VTC4 Data Sheet
VCXO Functional Description
VCXO Feature: The VTC4 can be ordered with a VCXO function for applications were it will be used in a PLL, or the output frequency needs fine tune adjustments. This is a high impedance input, 1 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 were the VTC4 will be not be used in a PLL, or the output frequency does not fine tune adjustments, the best device to use would be a VTC4-x0xxx. 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). Outline Diagrams, Pad Layout and Pin Out
Table 2. Pinout
Pin # Symbol Function
1 N/C or
V C No Connect (VTC4-x0xx) or VCXO Control Voltage
2 GND Electrical and Case Ground
3 f O Output Frequency
4 V DD Supply Voltage
NOTE: Additional pads are used to program and adjust the TCXO during manufacturing and should be left open; do not terminate these to the supply voltage. Some designs do not include these additional pads.
Contact Pads are gold over nickel
Figure 3, Package drawing
VTC4 Data Sheet
Tape and Reel
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can permanently damage the device. Functional operation is not implied at these or any other conditions in 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.
Table 4. Absolute Maximum Ratings
Parameter Symbol Ratings Unit
Storage Temperature Tstorage -55/125 °C
Reliability
The VTC4 qualification tests have included:
Table 5. Environnemental Compliance
Parameter Conditions
Mechanical Shock MIL-STD-883 Method 2002
Mechanical Vibration MIL-STD-883 Method 2007
Temperature Cycle MIL-STD-883 Method 1010
Solderability MIL-STD-883 Method 2003
Gross and Fine Leak MIL-STD-883 Method 1014
Resistance to Solvents MIL-STD-883 Method 2015
VTC4 Data Sheet
Handling Precautions
Although ESD protection circuitry has been designed into the the VTC4, proper precautions should be taken when handling and mounting. VI employs a Human Body Model and a Charged-Device Model (CDM) for ESD susceptibility testing and design protection evaluation. ESD thresholds are dependent on the circuit parameters used to define the model. Although no industry wide standard has been adopted for the CDM, a standard HBM of resistance = 1.5kohms and capacitance = 100pF is widely used and therefore can be used for comparison purposes.
Table 6. ESD Ratings
Model Minimum Conditions
Human Body Model 1000 MIL-STD-883 Method 3115
Charged Device Model 1500 JESD 22-C101 Suggested IR profile
Devices are built using lead free epoxy and can also be subjected to standard lead free IR reflow conditions, Table 7 shows max temperatures and lower temperatures can also be used e.g. peak temperature of 220C.
Table 7. Reflow Profile (IPC/JEDEC J-STD-020B)
Parameter Symbol Value PreHeat Time t
150 sec Min, 200 sec Max
S
Ramp Up R
3 o C/sec Max
UP
Time Above 217 o C t L60 sec Min, 150 sec Max
Time To Peak Temperature t
480 sec Max
AMB-P
Time At 260 o C (max) t
10 sec Max
P
Time At 240 °C (max) t
60 sec Max
p2
Ramp Down R
6 o C/sec Max
DN
VTC4 Data Sheet
Ordering Information
Table 8. Standard Frequency List 10.000 12.504 12.800 13.000
13.568 14.000 14.31818 14.4844 14.7456 15.000 16.000 16.325291 16.367667 16.396 16.800 17.500 18.414 19.200 19.440 19.680 19.800 20.000 21.250 23.104 24.000 24.5535 25.000
25.600 27.456
TCXO, 5x3.2
Pulling Range
0: Fixed TCXO, no adjust 1: ±5ppm A: ±0.5ppm 2: ±8ppm 1: ±1.0ppm 3: ±10ppm B: ±1.5ppm 4: ±15ppm 2: ±2.0ppm 5: ±20ppm C: ±2.5ppm
3: ±3.0 ppm Note: Not all combinations are available:
D: ±3.5ppm
±0.5 ppm is available over 0/ 55 °C, and on a case by case basis for -10/60C. 4: ±4.0ppm ±1.0 ppm to ±5.0 ppm is available on all temperature ranges
5: ±5.0ppm
https://www.wendangku.net/doc/f713297191.html,
December 29, 2005
USA: Vectron International ? 267 Lowell Road, Hudson, NH 03051 ? Tel: 1-88-VECTRON-1 ? Fax: 1-888-FAX-VECTRON
EUROPE: Landstrasse, D-74924, Neckarbischofsheim, Germany ? Tel: 49 (0) 7268 8010 ? Fax: 49 (0) 7268 801281
ASIA: Vectron Asia Pacific Sales 1F~2F. No.8 Workshop No.308 Fenju Rd., WaiGaoQiao Free Trade Zone, Pudong New Area Shanghai, China 200131 ?Tel: 8621 50480777 ? Fax: 8621 50481881