TEMPERATURE-COMPENSATED CRYSTAL OSCILLATORS
EM38S & VEM38S
CLIPPED SINEWAVE TCXO & VCTCXO
DESCRIPTION
M38 TCXOs incorporate a hermetically sealed crystal designed to provide
a highly stable frequency source with the lowest possible phase-noise and
ageing. The EM38S TCXO has a 3 pin leaded package conforming to the
dimensions of 14 pin dual-in-line and incorporates a mechanical trimmer
for fine frequency adjustment. VEM38S packages are provided with 4 pins
for the purpose of electrical frequency tuning. Available with power supply
from 2.3 Volts to 5.5 Volts.
PACKAGE OUTLINE
FEATURES
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Frequency range 9.6MHz to 26.0MHz
Clipped sine output
Power supply from +2.3 Volts to +5.5 Volts
Stability from±1ppm over -30° to +70°C
Mechanical frequency tuning (EM38S)
Electrical frequency tuning (VEM38S)
GENERAL SPECIFICATION
Frequency Range:
Output Waveform:
Initial Calibration Tolerance:
Standard Frequencies:
9.6.MHz to 26.0MHz
Clipped Sine Wave
±3ppm mechanical adjust
9.6, 10.0, 12.8, 13.0, 14.4, 15.36,
16.384, 19.2, 19.44, 19.68MHz
(Partial list)
from ±1ppm to ±5ppm (see table)
±1ppm max. first year 25°C amb.
±0.3ppm max. for ±5% change
±0.3ppm max. for ±10% change
±1ppm max. for one reflow
measured 24 hours afterwards
See table
±3ppm minimum
2ms typical to reach 90%
amplitude at 25°±2°C
+2.3VDC min. to +5.5VDC max.
(Specify when ordering. Standard
is +3.0 Volts and +5.0 Volts)
+3.0 Volts
+5.0 Volts
0.8V p-p min.
1.0V p-p
See table
10kW//15pF
-12dB typical, -9dB maximum
DC Block, AC Coupled
-40° to 85°C
Frequency Stability
vs Temperature:
vs Ageing:
vs Voltage Change:
vs Load Change:
vs Reflow Soldering:
Operating Temperature Range:
Mechanical Frequency Tuning:
Start-up Time:
Input Voltage Range:
CURRENT CONSUMPTION
Frequency
Range
(MHz)
9.6~ 13
13.1~20
20.1~26
Current Consumption (mA max.)
3.0 Volts
1.3
1.5
2.0
5.0 Volts
2.0
2.2
2.5
Stability (ppm)
Output Voltage Level
Supply :
Output Voltage:
Current Consumption:
Output Load:
Harmonic Distortion:
Output Format:
Storage Temperature:
TEMPERATURE STABILITY
Operating Temperature Range (°C~°C)
0~+60 -10~+60 0~+70 -20~+70 -30~+70 -40+85
±1
±1.5
±2
±2.5
±3
±5
VCTCXO (only)
Electrical Frequency Tuning:
(Control on pin 1)
3.0 Volts
5.0 Volts
±5~±12ppm
±6~±12ppm
for +1.5±1V
for +2.5±2V
(<±100ppm is also available)
Positive - An increase of control
voltage increases output frequency
10% maximum
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X
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= Available
X = Not available
Slope Polarity:
Linearity:
PART NUMBERING
Example: VEM38S5-12.800-2.5/-30+75
V
Voltage Control
V = VCTCXO
Blank = TCXO
EM38
Package
Code
S
Output Waveform
S = Clipped Sine
5
Input Voltage
3 = 3.0 Volts
5 = 5.0 Volts
or Custom
12.8
Nominal
Frequency
(MHz)
2.5/
Frequency
Stability
-30+75
Operating
Temperature
Range
°C to °C
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 1460 230000 Fax: +44 1460 230001 email: info@euroquartz.co.uk web: www.euroquartz.co.uk
Analog electronics
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