75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com • RevC0911
1
VFTX250
TCXO – Ultra Low Power
2.5x2.0mm SMD, Clipped Sine wave
Parameter Symbol Condition Min Typ Max Unit Note
Frequency
Range F 10 52 MHz
Frequency
Stability ∆F/F
vs. Temperature
0.5
2.5
ppm
Ref. to +25°C
frequency
See “How to
Order chart for
available
options
vs. Supply Voltage
(±5%) 0.2
vs. Load (±10%) 0.2
Aging 1.0 ppm/yr
Operating
Temperature T -40 +85 C
See “How to
Order” chart
for available
options
Tolerance 25 °C
1 hour after reflow
2.0 ppm
Supply
Voltage VDD
2.66
2.375
2.8
2.5
2.94
2.625 V Order Code L
Order Code G
Supply
Current Icc 10MHz ≤ Fo < 26MHz
26MHz ≤ Fo ≤ 52MHz 2.0
2.5 mA
Max Current
across entire
temp range
Control
Voltage
VCTCXO models only
0.4 2.4 V
Pull Range 5 ppm
Ref. to
nominal
frequency
Input
Impedance 500 KΩ
Features
10 – 52 MHz Frequency Range
2.8V or 2.5V Supply Voltage
Low power consumption
TCXO and VCTCXO models available
Applications
Portable Communications
GPS
Electrical Specifications
RoHS Status
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com • RevC0911
2
VFTX250
TCXO – Ultra Low Power
2.5x2.0mm SMD, Clipped Sine wave
—
Frequency Stability
Code Specification
L ±0.5ppm
K ± 1.0ppm
J ± 1.5ppm
H ± 2.0ppm
G ± 2.5ppm
Pullability
Code Specification Type
T N/A TCXO
A ±5ppm VCTCXO
B ±8ppm VCTCXO
C ±10ppm VCTCXO
Parameter Symbol Condition Min Typ Max Unit Note
Output Clipped sine wave Load: 10 KΩ // 10pF
DC cut
Capacitor
required
Level 0.8 Vp-p
Phase Noise
100Hz
1KHz
10KHz
-115
-135
-148
dBc/Hz @ 19.2MHz
Start up time 2 ms
Electrical Specifications
How to Order
VFTX250 — FRE
Q
UENCY
,
MHz
Temp. Range
Code Specification
A 0°C ~ +50°C
C -10°C ~ +60°C
D -20°C ~ +70°C
F -30°C ~ +85°C
G -40°C ~ +85°C
Supply Voltage
Code Specification
G 2.5V
L 2.8V
Code Temperature
Range ±0.5ppm ±1.0ppm ±1.5ppm ±2.0ppm ±2.5ppm
A 0°C to +50°C º º º º º
C -10°C to +60°C º º º º º
D -20°C to +70°C º º º º º
F -30°C to +85°C º º º º
G -40°C to +85°C º º º
* Available case by case
Available Frequency Stabilities over Operating Temperature Ranges
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com • RevC0911
3
VFTX250
TCXO – Ultra Low Power
2.5x2.0mm SMD, Clipped Sine wave
Parameter Specification
Mechanical Shock Per MIL-STD-202, Method 213, Condition E
Thermal Shock Per MIL-STD-883, Method 1011, Condition A
Vibration Per MIL-STD-883, Method 2007, Condition A
Soldering Conditions 260C for 10s max
Hermetic Seal Leak rate less than 5x10-
8
atm.cc/s of helium
Storage Temperature -55C to +125C
Environmental and Mechanical
Pin # Connection
1 Vc (VCTCXO models)
GND (TCXO models)
2 GND
3 Output*
4 VDD
* Note: DC cut capacitor (series blocking capacitor)
required at OUTPUT. 150pF NPO recommended.
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