EURO
QUARTZ
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
TCXO
EM14T Series
DESCRIPTION
Package 14 pin DIL
Frequency range: 20.0 to 50.0kHz; 32.768kHz
Supply voltage 3.3 or 5.0 Volts
Frequency stability from ±1ppm over -30 to +75°C
EM14T series TCXOs are packaged in a miniature 6 pad ceramic SMD
package. With squarewave (CMOS) output, tolerances are available
from ±1.0ppm over -30° to +75°C. The part has a 0.01mF decoupling
capacitor built in.
EM14T - OUTLINES AND DIMENSIONS
FREQUENCY STABILITY
Frequency +3.3 V
32.768kHz 8.0mA
50kHz 12mA
CURRENT CONSUMPTION
SPECIFICATION
Product Series Code
TCXO: EM14T
VCTCXO: VEM14T
Frequency Range: 32.768kHz Standard frequency
20.0kHz to 50.0kHz
Output Waveform: Squarewave
Initial Calibration Tolerance
Models with mech. trimmer: <1.0ppm (at t. 25°±2°C)
Models without trimmer: <2.0ppm (at t. 25°±2°C)
Operating Temperature Range: See table
Frequency Stability
vs. Ageing: ±1.0 ppm max. first year
vs. Voltage Change: ±0.3 ppm max. ±5% change
vs. Load Change: ±0.3 ppm max. ±10% change
vs. Reflow: ±1ppm max. for one reflow
(Measured after 24 hours)
Supply Voltage: +3.3 or +5.0Volts
(Specify when ordering)
Output Logic Levels: Logic High: 90% Vdd min.
Logic Low: 10% Vdd max.
Rise and Fall Times: 10ns max.
Duty Cycle: 50%±5%
Start-up Time: 2ms typical, 5ms max.
Current Consumption: See table below
Output Load: 15pF
Storage Temperature: -55~+125°C
PART NUMBERING PROCEDURE
Example:
EM14T33-32.768k-2.5/-30+75
Supply Voltage
33 = 3.3 VDC
5 = 5.0 VDC
Frequency (kHz)
Stability over OTR (±ppm)
Operating Temperature Range (OTR) (°C)
Lower and upper limits.
Series Description
TCXO = EM14T
VCTCXO = VEM14T
Control Voltage: Standard = +1.5±1.0Volts for all input
voltages. (Contact technical sales if
+2.5±2.0 Volts is required.)
Frequency Deviation: ±6.0 ppm min.
Slope Polarity: Positive (increase of control voltage increases
output frequency.)
Input Impedance: 10k min.
Modulation Bandwidth: 3.0kHz min. measured at -3dB
Linearity: 10% max.
VEM14T VOLTAGE CONTROL SPECIFICATION
HCMOS 14 pin DIL, kHz Range
Frequency Stability (ppm) ±0.5 ±1.0 ±1.5 ±2.0 ±2.5
Temperature
Range (°C)
0 ~ +50 ASK P P P P
-10 ~ +60 xP P P P
-20 ~ +70 x x P P P
-30 ~ +75 x x x P PP
-40 ~ +85 x x x x P
P = available, x = not available, ASK = call Technical Sales
FREQUENCY STABILITY
