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EURO QUARTZ
Industry-standard SMD package 11.4 x 9.6 x 4.7mm Close tolerance stabilities from 0.5ppm over 0 to +50C 1ppm over -40 to +85C Low power consumption
EM44S Series TCXO
Clipped Sinewave, 4 Pad FR4 substrate SMD
EM44S - OUTLINES AND DIMENSIONS DESCRIPTION EM44S series TCXOs are packaged in the industry-standard 11.4 x 9.6 x 4.7mm SMD package. With clipped sinewave output, close tolerances are available from 0.5ppm over 0 to 50C or 1ppm over -40 to +85C. The part has low power consumption. SPECIFICATION Product Series Code TCXO: VCTCXO: Frequency Range: Output Waveform: Initial Calibration Tolerance**: Standard Frequencies: EM44S VEM44S 10.0MHz to 27.0MHz Clipped Sinewave <1ppm at 25C 10.0, 12.80, 13.0, 14.40, 15.36, 16.384, 19.2, 19.440, and 19.68MHz (Partial list) 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, +3.0 or +5.0Volts (Specify when ordering) 0.8V p-p minimum 2ms typical, 5ms max. See table below 10kOhm//10pF 10% -10dB typical, -7dB max. See table DC block, AC coupled -50 to +100C
Operating Temperature Range: Frequency Stability vs. Ageing: vs. Voltage Change: vs. Load Change: vs. Reflow: Supply Voltage: Output Voltage Level: Start-up Time: Current Consumption: Output Load: Harmonic Distortion: SSB Phase Noise: FREQUENCY STABILITY Output Format: Storage Temperature: FREQUENCY STABILITY
Frequency Stability (ppm) 0 ~ +50 -10 ~ +60 Temperature Range (C) -20 ~ +70 -30 ~ +75 -40 ~ +85 P 0.5 ASK x x x x
VEM44S VOLTAGE CONTROL SPECIFICATION Standard = +1.51.0Volts for all input voltages. (Contact technical sales if +2.52.0 Volts is required.) Frequency Deviation: 6.0 ppm min. Slope Polarity: Positive (increase of control voltage increases output frequency.) Input Impedance: 1.0M min. Modulation Bandwidth: 3.0kHz min. measured at -3dB Linearity: 10% max. Control Voltage:
1.0 P P x x x
1.5 P P P x x
2.0 P P P P x
2.5 P P P PP P
PHASE NOISE
Offset (Hz) SSB Phase Noise at 25C EM44S 13MHz (dBc/Hz)
10 -80
100 -115
1k -135
10k -148
100k -150
= available, x = not available, ASK = call Technical Sales
CURRENT CONSUMPTION
Frequency Range 10.0MHz to 13MHz 13.1MHz to 20MHz 20.1MHz to 27MHz +3.0 V 1.3mA 1.5mA 2.0mA +5.0 V 2.0mA 2.2mA 2.5mA
PART NUMBERING PROCEDURE Example:
EM44S3-19.44-2.5/-30+75
Series Description TCXO = EM44S VCTCXO = VEM44S Supply Voltage 28 = 2.8 VDC 3 = 3.0 VDC 5 = 5.0 VDC Frequency (MHz) Stability over OTR (ppm) Operating Temperature Range (OTR) (C) Lower and upper limits.
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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