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 Oscillator Type
RS Stock No. 103-9918
Mfr. Part No.DS3232SN#
HK$64.52
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#
HK$73.85
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. 709-9369
Mfr. Part No.R0053-T-036-3
BrandTAITIEN
HK$23.60
Each
units
13 MHz ±2.5ppm - SMD Clipped Sinewave -30 °C +85 °C 1.2mm 5 x 3.2 x 1.2mm TCXO
RS Stock No. 178-2030
Mfr. Part No.TT32M327K50ITR
BrandCTS
HK$42.245
Each (On a Reel of 1000)
units
32.76 kHz ±5ppm - SMD HCMOS -40 °C +85 °C 1.4mm 3.28 x 2.5 x 1.4mm TCXO
RS Stock No. 122-4339
Mfr. Part No.R0053-T-040-3
BrandTAITIEN
HK$20.881
Each (On a Reel of 1000)
units
20 MHz ±0.5ppm - SMD Clipped Sinewave -30 °C +85 °C 1.2mm 5 x 3.2 x 1.2mm TCXO
RS Stock No. 144-2373
BrandRS PRO
HK$238.01
Each
units
24.57 MHz ±0.028ppm - SMD HCMOS, TTL -40 °C +85 °C 2mm 7 x 5 x 2mm TCXO
RS Stock No. 178-2699
Mfr. Part No.TT32M327K50ITR
BrandCTS
HK$59.145
Each (In a Pack of 2)
units
32.76 kHz ±5ppm - SMD HCMOS -40 °C +85 °C 1.4mm 3.28 x 2.5 x 1.4mm TCXO
RS Stock No. 146-4005
Mfr. Part No.LFPTXO000295
BrandIQD
HK$457.694
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. 709-9259
Mfr. Part No.TCETCLSANF-10.0MHz
BrandTAITIEN
HK$29.50
Each
units
10 MHz ±2ppm - SMD Clipped Sinewave -40 °C +85 °C 2mm 7 x 5 x 2mm TCXO
RS Stock No. 709-9408
Mfr. Part No.R0053-T-048-3
BrandTAITIEN
HK$19.40
Each
units
16.368 MHz ±0.5ppm - SMD Clipped Sinewave -30 °C +85 °C 1mm 3.2 x 2.5 x 1mm TCXO
RS Stock No. 146-3950
Mfr. Part No.LFTVXO009917
BrandIQD
HK$137.44
Each (In a Bag of 100)
units
20 MHz ±0.5ppm 15pF SMD HCMOS -40 °C +85 °C 2mm 7 x 5 x 2mm TCXO
RS Stock No. 144-2366
BrandRS PRO
HK$35.47
Each (In a Pack of 2)
units
32 MHz ±0.5ppm - SMD Clipped Sinewave -30 °C +85 °C 0.7mm 2.5 x 2 x 0.7mm TCXO
RS Stock No. 732-7591
Mfr. Part No.DS32KHZSN#
HK$79.53
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. 144-2359
BrandRS PRO
HK$33.975
Each (In a Pack of 2)
units
32 MHz - - SMD CMOS -20 °C +70 °C 0.95mm 2.5 x 2 x 0.95mm TCXO
RS Stock No. 144-2355
BrandRS PRO
HK$39.41
Each (In a Pack of 2)
units
26 MHz - - SMD CMOS -20 °C +70 °C 0.95mm 2.5 x 2 x 0.95mm TCXO
RS Stock No. 148-4324
Mfr. Part No.LFTVXO009907
BrandIQD
HK$176.70
Each
units
20 MHz ±0.9ppm 15pF SMD HCMOS -20 °C +70 °C 2mm 7 x 5 x 2mm TCXO
RS Stock No. 672-0769
Mfr. Part No.VM53S3-10.000-2.5/-30+75
BrandMERCURY
HK$77.00
Each
units
10 MHz ±2.5ppm - SMD Clipped Sinewave -30 °C +75 °C 1.5mm 5 x 3.2 x 1.5mm TCXO
RS Stock No. 144-2367
BrandRS PRO
HK$33.975
Each (In a Pack of 2)
units
10 MHz ±1.5ppm - SMD Clipped Sinewave -40 °C +85 °C 0.7mm 2.5 x 2 x 0.7mm TCXO
RS Stock No. 144-2357
BrandRS PRO
HK$33.975
Each (In a Pack of 2)
units
10 MHz - - SMD CMOS -20 °C +70 °C 0.95mm 2.5 x 2 x 0.95mm TCXO
RS Stock No. 478-9101
Mfr. Part No.LFTVXO009975
BrandIQD
HK$197.50
Each
units
26 MHz ±2.5ppm - SMD Clipped Sinewave -30 °C +80 °C 2mm 7 x 5 x 2mm TCXO
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