TEMPERATURE-COMPENSATED CRYSTAL OSCILLATORS

 

TCXOs and VCTCXOs
Euroquartz produce a wide range of TCXOs offering choice of power supply, stability over operating temperature range and output types.

 

Output Options

TCXOs are available with these outputs:

• SQUAREWAVE - CMOS. See TABLE 1 below
• CLIPPED SINEWAVE - See TABLE 2 below
  
  Custom Designed Product
  If you cannot find the frequency or specification TCXO on this page, contact Euroquartz and we will design and manufacture non-standard specification TCXOs for you. Euroquartz sales and engineering staff are always willing to discuss your requirements.

 

All TCXO products are RoHS compliant unless otherwise indicated.

 

TABLE 1. SQUAREWAVE OUPUT TCXOs

TYPE		DESCRIPTION	OUTPUT TYPE	STANDARD TCXO	Voltage Controlled TCXO
Model	Package
EM57T		SMD 7x5x2.5mm 2.5MHz ~ 170MHz Stability from 0.5ppm at 0~50°C. Supply from 2.8 to 5.0 Volts	HCMOS	TCXO	VCTCXO
EM57T  32.768kHz		SMD 7x5x2.5mm 32.768kHz Stability from 2.5ppm -30~75°C. Supply from 2.8 to 5.0 Volts	HCMOS	TCXO	VCTCXO
EM44T		SMD 11.4x9.6x4.7mm 2.5MHz ~ 170MHz Stability from 0.5ppm at 0~50°C. Supply from 2.8 to 5.0 Volts	HCMOS	TCXO	VCTCXO
EM42T		SMD 11.4x9.6x2.5mm 2.5MHz ~ 170MHz Stability from 0.5ppm at 0~50°C. Supply from 2.8 to 5.0 Volts	HCMOS	TCXO	VCTCXO
EM14T		14 pin DIL 1.2MHz ~ 156MHz Stability from 1.0ppm at -30~75°C. Supply from 3.0 or 5.0 Volts	HCMOS	TCXO	VCTCXO
EM38T		14 pin DIL Compatible 1.2MHz ~ 156MHz Stability from 1.0ppm at -30~75°C. Supply from 3.0 or 5.0 Volts	HCMOS	TCXO	VCTCXO
T90		Rugged TCXO Miniature SMD package 9.14 x 7.49 x 3.90mm 10MHz to 200MHz High shock and vibration withstand levels <100000g	HCMOS, PECL, LVPECL or CLIPPED SINEWAVE -
T75		Rugged TCXO Miniature 7x5mm SMD package 7 x 5 x 2mm 10MHz to 50MHz High shock and vibration withstand levels <100000g	HCMOS or CLIPPED SINEWAVE -

 

TABLE 2. CLIPPED SINEWAVE TCXOs

TYPE		DESCRIPTION	OUTPUT TYPE	STANDARD TCXO	Voltage Controlled TCXO
Model	Package
EM57S		SMD 7x5x2mm 9.6MHz ~ 26MHz Stability from 0.5ppm at 0~50°C. Supply from 3.0 or 5.0 Volts	CLIPPED SINEWAVE	TCXO	VCTCXO
EM53S		SMD 5x3.2x1.5mm 9.6MHz ~ 26MHz Stability from 0.5ppm at 0~50°C. Supply from 2.3 to 5.5 Volts	CLIPPED SINEWAVE	TCXO	VCTCXO
EM44S		SMD 11.4x9.6x4.7mm 9.6MHz ~ 26MHz Stability from 0.5ppm at 0~50°C. Supply from 3.0 or 5.0 Volts	CLIPPED SINEWAVE	TCXO	VCTCXO
EM42S		SMD 11.4x9.6x2.5mm 9.6MHz ~ 26MHz Stability from 0.5ppm at 0~50°C. Supply from 3.0 or 5.0 Volts	CLIPPED SINEWAVE	TCXO	VCTCXO
EM14S		14 pin DIL 9.6MHz ~ 26MHz Stability from 1.0ppm at -30~75°C. Supply from 3.0 or 5.0 Volts	CLIPPED SINEWAVE	TCXO	VCTCXO
EM38S		14 pin DIL Compatible 9.6MHz ~ 26MHz Stability from 1.0ppm at -30~75°C. Supply from 3.0 or 5.0 Volts	CLIPPED SINEWAVE -	TCXO	VCTCXO
T90		Rugged TCXO Miniature SMD package 9.14 x 7.49 x 3.90mm 10MHz to 200MHz High shock and vibration withstand levels <100000g	HCMOS, PECL, LVPECL or CLIPPED SINEWAVE -
T75		Rugged TCXO Miniature 7x5mm SMD package 7 x 5 x 2mm 10MHz to 50MHz High shock and vibration withstand levels <100000g	HCMOS or CLIPPED SINEWAVE -

 

LIST OF STANDARD FREQUENCIES

HCMOS (SQUAREWAVE) OUTPUT Standard Frequencies (MHz)

1.2000	1.2500	1.5000	1.6000	1.6250	1.6875	1.8000
1.9200	2.4600	2.5000	3.0000	3.2000	3.2500	3.3750
3.6000	3.8400	4.0960	4.8000	4.8600	4.9200	5.0000
6.0000	6.4000	6.5000	6.7500	7.2000	7.6800	8.1920
9.6000	9.7200	9.8400	10.0000	12.0000	12.8000	13.0000
13.5000	14.4000	15.3600	16.3840	19.2000	19.4400	19.6800
20.0000	24.0000	25.6000	26.0000	27.0000	28.8000	30.7200
32.7680	38.4000	38.8800	39.3600	40.0000	48.0000	51.2000
52.0000	54.0000	57.6000

CLIPPED SINEWAVE OUTPUT Standard Frequencies (MHz)

9.600	10.000	12.000	12.800	13.000	13.500	14.400
15.360	16.384	19.200	19.440	19.680	20.000

 

TCXOs and VCTCXOs

Standard clock oscillators can be produced to within ±15ppm over the temperature range 0° to +70°C, the limit being due to frequency drift with ambient temperature variation. To improve stability, a temperature compensation network can be incorporated into the oscillator circuit. The compensation network employs the negative temperature coefficient of thermistors. An oscillator so configured can exhibit stabilities in the order of 0.1ppm to 3ppm over a wide temperature range. This type of oscillator is known as a Temperature-Compensated Crystal Oscillator (TCXO). A version of this oscillator with a variable frequency output controlled by an external voltage is known as a Voltage Controlled Temperature Compensated Crystal Oscillator (VCTCXO). The Euroquartz range of TCXOs and VCTCXOs is detailed below.

 

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