QUARTZ
EURO
OCXO - OC18T5A
AT-Cut Crystal - Square Wave - 5.0 Volts
1.25MHz ~ 100.0MHz
Frequency Range 1.25MHz to 100.0MHz
20.3 x 20.3 x 10.5mm 5 pin metal, solder-sealed package
Supply Voltage 5.0 Volts
AT-Cut Crystal
Squarewave Output
EFC (Voltage control) as standard
OUTLINE & DIMENSIONS
DESCRIPTION
OC18T5A series oven-controlled crystal oscillators are close tolerance
OCXOs with good phase noise performance.
SPECIFICATION
Crystal Cut:
AT-cut
Output Waveform:
Supply Voltage:
Square Wave
+5.0 VDC ±0.2V
1.25MHz to 100.0MHz
Frequency Range:
Initial Calibration Tolerance:
Frequency Stability
over 0° to +60°C:
over -20° to +70°C:
over -40° to +85°C:
vs. Voltage Change:
vs. Ageing:
CON
±0.5ppm max. (at V
2.5V)
±0.02ppm
±0.05ppm
±0.1ppm
<±20ppb for ±5% change
±5.0ppb max per day
±0.5ppm per first year
±3.0ppm over 10 years
<±20ppb for ±5% change
vs. Load Change:
Warm-up Time:
TEST CIRCUIT
3 minutes max. to within
±0.5ppm of nominal freq.
Voltage Control
CON
Control Voltage Centre:
Freq. Deviation Range:
+2.5 Volts (V
)
±5.0ppm min., ±20ppm max.
ref. to 25°C and O.T.R.
2.5V ±2.0Volts
Positive: Increasing control
voltage increases output
frequency.
Control Voltage Range:
Transfer Function:
Input Impedance:
EFC Linearity:
100k minimum
±10% maximum
Power Dissipation:
200mA max. steady state
500mA max. at turn on
Output
PART NUMBER FORMAT
Example:
Load:
15pF HCMOS
+4.5V minimum
0.5V maximum
Output Logic HIGH:
Output Logic LOW:
Duty Cycle:
OC18GT5A-10.000-0.05/-20+70
50%±10%
Rise/Fall Time:
5ns max (20%~80%)
Frequency dependant
+4.0±0.3VDC or custom
OCXO Package: OC18
RoHS Compliance
Reference Voltage:
G: RoHS Compliant
Envionmental
Storage Temperature:
Shock:
Blank: Non-compliant
-55° to +125°C
2000g, 0.3ms ½ sine
10 ~2000Hz / 10g
T: Output Squarewave
5: Supply Voltage 5.0Volts
A: AT-Cut Crystal
Vibration:
Nominal Frequency 10.0MHz
Stability in ppm
PHASE NOISE (at 10MHz)
Operating Temperature Range °C
Lowest Temperature/Highest Temperature
Offset
1Hz
dBc/Hz
-75
10Hz
-100
100Hz -130
1kHz
10kHz
-140
-150
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk