EURO
QUARTZ
14 pin DIL compatible package
Wide frequency range: 1.2MHz to 156MHz
Supply voltage 3.0 or 5.0 Volts
EFC tuning ±5ppm to ±12ppm
Customized specifications available
VEM38T Series TCXO
Voltage-controlled 14 pin DIL compatible
VEM38T - OUTLINES AND DIMENSIONS
DESCRIPTION
VEM38T series TCXOs are packaged in the industry-standard 14 pin
Dual-in-Line package. With HCMOS output, tolerances are available
from ±1.0ppm over 0° to 50°C to ±1ppm over -30° to +70°C. Supply
voltage 3.0 or 5.0 Volts. The output is controllable by EFC enabling
output variation of ±5ppm to ±12ppm.
SPECIFICATION
Product Series Code:
Frequency Range:
Output Waveform:
Standard Frequencies:
VEM38T
1.2MHz to 156.0MHz
Square wave (HCMOS)
9.6, 10.0, 12.80, 13.0, 14.40,
15.36, 16.384, 19.200,
19.44 and 19.68MHz.
(Partial
list)
See table
See table
±1.0 ppm max. first year
±0.3 ppm max. ±5% change
±0.3 ppm max. ±10% change
±1ppm max. for one reflow
(Measured after 24 hours)
+3.0 VDC (Code ‘3’)
+5.0 VDC (Code ‘5’)
80% Vdd min.
10% Vdd max.
10ns max. (20%~80%)
50%±10% (at 50%Vdd)
10ms max.
25mA max. (Freq. dependent)
30mA max. (Freq. dependent)
15pF
See table
AC block, DC coupled
-50° to +100°C
±5ppm to ±12ppm
For control of +1.5V ±1.5V
±6ppm to ±12ppm
For control of +2.5V ±2.0V
Positive (Increase of control
Voltage increases output
frequency.)
Operating Temperature Range:
Frequency Stability:
vs. Ageing:
vs. Voltage Change:
vs. Load Change:
vs. Reflow:
Supply Voltage:
Output Voltage Levels
Logic ‘1’ HIGH:
Logic ‘0’ LOW:
Rise & Fall Times:
Duty Cycle (Symmetry):
Start-up Time:
Current Consumption:
3.0 Volt supply:
5.0 Volt supply:
Output Load:
SSB Phase Noise:
Output Format:
Storage Temperature:
Electrical Frequency Tuning
3.0 Volts supply:
5.0 Volts supply:
Slope Polarity:
VEM38T - TEST CIRCUIT
PHASE NOISE (Example: VEM38T at 10.0MHz)
Offset
(Hz)
SSB Phase Noise
at 25°C
VEM38T
100MHz
(dBc/Hz)
10
100
1k
10k
100k
-72
-110
-125
-132
-125
VEM38T - PART NUMBERING PROCEDURE
FREQUENCY STABILITY
Frequency Stability (ppm)
0 ~ +50
Operating
Temperature
Range (°C)
-10 ~ +60
-20 ~ +70
-30 ~ +75
±1.0
±1.5
±2.0
±2.5
Example:
VEM38T3-19.44-2.5/-30+75
= standard specification
Series Description
Supply Voltage
3 = 3.0 VDC
5 = 5.0 VDC
Frequency
Stability over OTR (ppm)
Operating Temperature Range (OTR) (°C)
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
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