TCXO Oscillators

TCXO’s (Temperature Compensated Crystal Oscillators) are used in designs that need better temperature stability than what can be offered by XO’s or VCXO oscillators. TCXO Oscillators can achieve stability of less than 1ppm as opposed to a typical crystal of 30ppm.

A wide range of temperature stabilities options are available in TCXO’s, from 5ppm to 50ppb. TCXO oscillators vary in size from the smallest 2.0 x 1.6mm to larger sizes and even TH devices used in military applications.

The key factor to consider when selecting a TCXO is the temperature range over which it operates. -20°C to 70°C is common with -40°C to 85°C a premium especially at tight tolerances.


How do TCXO’s work?


TCXO Oscillators use a compensation network that senses the change in frequency over temperature and creates a near inverse curve. This is used to pull the TCXO back to the nominal frequency. The remaining error we see is the stated stability, e.g. 1ppm over -20°C to 70°C meaning the error from nominal should be no larger over that temperature range.

One of the first types of TCXO compensation was &147direct compensation&148; these devices used a network of components to alter the capacitive load on the crystal to shift the frequency as it naturally changed with temperature. The other type is called the "indirect method", in early models this saw the use of thermistors again that created a temperature dependent voltage. This was used to drive a varactor who’s changing capacitance changed the crystal frequency

Today we see the use of an IC to change the voltage to the varactor, and testing in small temperature steps to confirm the correction (due to differences in the crystal curve). These types are referred to as analog TCXO’s.which are recommended for GPS/GNSS clocking applications; due to small shifts of frequency per °C change they help keep the GPS loop locked as temperature changes.

Digitally controlled TCXOs are also available and these tend to fall into the smaller packages and more cost-effective solutions. These oscillators use internal ADC’s (analog to digital converters) monitoring the temperature but follow the temperature change in digital steps related to the ADC value.
These types are unsuitable for GNSS solutions due to the frequency jumps over temperature.


VCTCXO - Voltage Controlled Temperature Compensated Oscillator


VCTCXO Oscillators have the same features as the TCXO with the added functionality of a voltage controlled function to allow precision tuning of the output frequency. The VCTCXO differentiate themselves by having a VC pad (voltage control) in the oscillator. This input requires an analog voltage that works to control the varactor inside and is normally part of an external PLL that controls the VCTCXO frequency.


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Description Price Output Frequency Frequency Stability Load Capacitance Package Type Output Level Minimum Operating Temperature Maximum Operating Temperature Height Dimensions Priced to Clear Oscillator Type
RS Stock No. 709-9375
Mfr. Part No.R0053-T-039-3
BrandTAITIEN
£3.96
Each
Units
19.2 MHz ±2.5ppm 10pF SMD Clipped Sinewave -30 °C +85 °C 1.2mm 5 x 3.2 x 1.2mm - TCXO
RS Stock No. 103-9918
Mfr. Part No.DS3232SN#
£5.912
Each (In a Tube of 36)
Units
32.768 kHz ±3.5ppm - SOIC CMOS -40 °C +85 °C 2.35mm 13 x 7.6 x 2.35mm - TCXO
RS Stock No. 732-7589
Mfr. Part No.DS3232SN#
£6.86
Each
Units
32.768 kHz ±3.5ppm - SOIC CMOS -40 °C +85 °C 2.35mm 13 x 7.6 x 2.35mm - TCXO
RS Stock No. 709-9470
Mfr. Part No.R0053-T-069-3
BrandTAITIEN
£3.26
Each
Units
20 MHz ±2.5ppm 10pF SMD Clipped Sinewave -30 °C +85 °C 0.9mm 2.5 x 2 x 0.9mm - TCXO
RS Stock No. 709-9420
Mfr. Part No.R0053-T-054-3
BrandTAITIEN
£1.56
Each
Units
26 MHz ±0.5ppm 10pF SMD Clipped Sinewave -30 °C +85 °C 1mm 3.2 x 2.5 x 1mm - TCXO
RS Stock No. 146-3963
Mfr. Part No.LFTVXO009907
BrandIQD
£8.497
Each (In a Bag of 100)
Units
20 MHz ±0.9ppm 15pF SMD HCMOS -20 °C +70 °C 2mm 7 x 5 x 2mm - TCXO
RS Stock No. 148-4324
Mfr. Part No.LFTVXO009907
BrandIQD
£9.78
Each
Units
20 MHz ±0.9ppm 15pF SMD HCMOS -20 °C +70 °C 2mm 7 x 5 x 2mm - TCXO
RS Stock No. 709-9293
Mfr. Part No.TCETBDSANF-30.72MHz
BrandTAITIEN
£2.22
Each
Units
30.72 MHz ±1ppm 10pF SMD Clipped Sinewave -30 °C +85 °C 2mm 7 x 5 x 2mm - TCXO
RS Stock No. 709-9486
Mfr. Part No.R0053-T-072-3
BrandTAITIEN
£0.98
Each
Units
26 MHz ±2.5ppm 10pF SMD Clipped Sinewave -30 °C +85 °C 0.9mm 2.5 x 2 x 0.9mm - TCXO
RS Stock No. 732-7591
Mfr. Part No.DS32KHZSN#
£5.42
Each
Units
32.768 kHz ±7.5ppm - SOIC CMOS -40 °C +85 °C 2.35mm 10.5 x 7.6 x 2.35mm - TCXO
RS Stock No. 103-9919
Mfr. Part No.DS32KHZSN#
£4.925
Each (In a Tube of 46)
Units
32.768 kHz ±7.5ppm - SOIC CMOS -40 °C +85 °C 2.35mm 10.5 x 7.6 x 2.35mm - TCXO
RS Stock No. 709-9372
Mfr. Part No.R0053-T-038-3
BrandTAITIEN
£3.31
Each
Units
14.7456 MHz ±2.5ppm 10pF SMD Clipped Sinewave -30 °C +85 °C 1.2mm 5 x 3.2 x 1.2mm - TCXO
RS Stock No. 478-9038
Mfr. Part No.LFTVXO009905
BrandIQD
£6.93
Each
Units
16.384 MHz ±0.9ppm 15pF 7x5mm SMD HCMOS -20 °C +70 °C 2mm 7 x 5 x 2mm - TCXO
RS Stock No. 148-5663
Mfr. Part No.LFPTXO000295
BrandIQD
£39.50
Each
Units
10 MHz ±1ppm - SMD HCMOS -40 °C +85 °C 1.8mm 5 x 3.2 x 1.8mm - TCXO
RS Stock No. 146-4005
Mfr. Part No.LFPTXO000295
BrandIQD
£35.907
Each (In a Bag of 10)
Units
10 MHz ±1ppm - SMD HCMOS -40 °C +85 °C 1.8mm 5 x 3.2 x 1.8mm - TCXO
RS Stock No. 709-9240
Mfr. Part No.TCETBDSANF-10.0MHz
BrandTAITIEN
£1.65
Each
Units
10 MHz ±1ppm - SMD Clipped Sinewave -30 °C +85 °C 2mm 7 x 5 x 2mm - TCXO
RS Stock No. 173-5939
Mfr. Part No.FOX801BELF-100
£13.512
Each (On a Reel of 1000)
Units
10 MHz ±2.5ppm - - Clipped Sinewave -30 °C +75 °C 2mm 11.4 x 9.6 x 2mm - TCXO
RS Stock No. 786-0843
Mfr. Part No.DS32KHZS#
£4.80
Each
Units
32.768 kHz 7.5ppm 15.5pF SOIC Squarewave 0 °C +70 °C 2.35mm 10.5 x 7.6 x 2.35mm - TCXO
RS Stock No. 547-5623
Mfr. Part No.FOX801BELF-100
£14.86
Each
Units
10 MHz ±2.5ppm - - Clipped Sinewave -30 °C +75 °C 2mm 11.4 x 9.6 x 2mm - TCXO
RS Stock No. 146-1286
Mfr. Part No.DS32KHZS#
£4.366
Each (In a Tube of 46)
Units
32.768 kHz 7.5ppm 15.5pF SOIC Squarewave 0 °C +70 °C 2.35mm 10.5 x 7.6 x 2.35mm - TCXO
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