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VEM42T28-19.68-2.5/-20+70

更新时间： 2024-11-06 09:00:39
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EUROQUARTZ /
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描述
HCMOS Output Clock Oscillator, 19.68MHz Nom, SMD, 4 PIN

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VEM42T28-19.68-2.5/-20+70 数据手册

  
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  
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