QUARTZ
EURO
TCXO
VEM42T Series
Voltage-Controlled HCMOS 11.4 x 9.6 x 2.5mm SMD
SMD package 11.4 x 9.6 x 2.5mm
Wide frequency range: 1.6MHz to 156MHz
Close tolerance stabilities from ±0.5ppm over 0° to +50°C
±1ppm over -40 to +85°C also available
EFC tuning ±5ppm to ±12ppm
VEM42T - OUTLINES AND DIMENSIONS
Supply voltage 2.8 Volts to 5.0 Volts
DESCRIPTION
VEM42T series VCTCXOs are packaged in the industry-standard 11.4
x 9.6 x 2.5mm package. Close tolerances are available from
±0.5ppm over 0° to 50°C or ±1ppm over -40° to +85°C. The output
is controllable by EFC enabling output control of ±5ppm to ±12ppm.
The parts have a 0.01uF decoupling capacitor built-in.
SPECIFICATION
Product Series Code:
Frequency Range:
Output Waveform:
Standard Frequencies:
VEM42T
1.6MHz 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)
Operating Temperature Range:
Frequency Stability
vs. Ageing:
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)
+2.8 VDC (Code ‘28’)
vs. Voltage Change:
vs. Load Change:
vs. Reflow:
Supply Voltage:
+3.0 VDC (Code ‘3’)
+3.3 VDC (Code ‘33’)
+5.0 VDC (Code ‘5’)
Output Voltage Levels
Logic ‘1’ HIGH:
80% Vdd min.
Logic ‘0’ LOW:
10% Vdd max.
VEM42T - TEST CIRCUIT
Rise & Fall Times:
Duty Cycle (Symmetry):
Start-up Time:
10ns max. (20%~80%)
50%±10% (at 50%Vdd)
10ms max.
Current Consumption:
E.F.C. Tuning:
30mA max. (Freq. dependent)
±5 to ±12ppm with Vcon =
+1.5V±1.0V. Note: All supply
versions have +1.5V Vcon.
Positive (inc. Vcon = inc. Freq.)
10% max.
Slope Polarity:
Linearity:
Output Load:
15pF
SSB Phase Noise:
Output Format:
Storage Temperature:
See table
AC block, DC coupled
-50° to +100°C
FREQUENCY STABILITY OVER TEMPERATURE
Frequency Stability (ppm)
0 ~ +50
±0.5
±1.0
P
±1.5
P
±2.0
P
±2.5
P
VEM42T - PART NUMBERING PROCEDURE
P
ASK
x
-10 ~ +60
P
P
P
P
Example:
VEM42T3-19.44-2.5/-30+75
Temperature
-20 ~ +70
Range (°C)
P
P
P
P
-30 ~ +75
-40 ~ +85
x
P
P
P
P
Series Description
Supply Voltage
x
P
P
P
P
28 = 2.8 VDC
P = available, x = not available, ASK = call Technical Sales
3 = 3.0 VDC
33 = 3.3 VDC
5 = 5.0 VDC
= standard specification
PHASE NOISE
Frequency
Stability over OTR (ppm)
Offset
(Hz)
10
100
1k
10k
100k
SSB Phase Noise
at 25°C
Operating Temperature Range (OTR) (°C)
VEM42T
100MHz
(dBc/Hz)
-72
-110
-125
-132
-125
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