EURO
QUARTZ
11.4 x 9.6 x 4.7mm SMD
Frequency Range: 9.6MHz to 26MHz
Close tolerance stabilities from ±0.5ppm over 0° to +50°C
±1ppm over -40 to +85°C also available
EFC tuning ±5ppm to ±12ppm
Very low power consumption
DESCRIPTION
VEM44S series VCTCXOs are packaged in the industry-standard 11.4
x 9.6 x 4.7mm package. With clipped sinewave output, 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
variation of ±5ppm to ±12ppm. The part has very low power
consumption.
SPECIFICATION
Product Series Code:
Frequency Range:
Output Waveform:
Initial Calibration Tolerance*:
Standard Frequencies:
VEM44S
9.6MHz to 26.0MHz
Clipped sinewave
±3ppm at 25°C
9.6, 10.0, 12.80, 13.0, 14.40,
15.36, 16.384, 19.2, 19.440,
and 19.680MHz.
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)
+2.6 VDC to +6.0 VDC
3.0V and 5.0V are standard
VEM44S Series TCXO
Voltage-controlled Clipped Sinewave 11.4 x 9.6 x 4.7mm SMD
VEM44S - OUTLINES AND DIMENSIONS
Operating Temperature Range:
Frequency Stability:
Over Operating Temperature range:
vs. Ageing:
vs. Voltage Change:
vs. Load Change:
vs. Reflow:
Input Voltage Range:
Output Voltage Level
+3.0V supply:
+5.0V supply:
Current Consumption:
Output Load:
Harmonic Distortion:
Output Format:
Storage Temperature:
Electrical Frequency Tuning
Slope Polarity:
Linearity:
FREQUENCY STABILITY
Frequency Stability (ppm)
0 ~ +50
-10 ~ +60
Temperature
Range (°C)
-20 ~ +70
-30 ~ +75
-40 ~ +85
ASK
x
x
x
±0.5
TYPICAL PHASE NOISE
0.8V p-p minimum
1.0V p-p minimum
See table
10k Ohms//15pF
-10dB typical, -7dB maximum
DC block, AC coupled
-40°C to +85°C
±5ppm to ±12ppm for .5Vdd
(<±100ppm is available)
Positive
(Increasing control V.
increases output frequency)
10% maximum
SSB Phase Noise
at 25°C
(VEM44S 13MHz)
Offset (Hz)
dBc/Hz
10
-72
100
-110
1k
-125
10k
-132
100k
-125
VEM44S - TEST CIRCUIT
±1.0
±1.5
±2.0
±2.5
VEM44S - PART NUMBERING PROCEDURE
Example:
= available, x = not available, ASK = call Technical Sales
= standard specification
CURRENT CONSUMPTION
Frequency Range
9.6MHz to 13MHz
13.1MHz to 20MHz
20.1MHz to 26MHz
+3.0 V
1.3mA
1.5mA
2.0mA
+5.0 V
2.0mA
2.2mA
2.5mA
VEM44S3-19.44-2.5/-30+75
Series Description
Supply Voltage
3 = 3.0 VDC
5 = 5.0 VDC
(specify other)
Frequency MHz
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
