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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Omschrijving Prijs Output Frequency Frequency Stability Load Capacitance Package Type Output Level Minimum Operating Temperature Maximum Operating Temperature Height Dimensions Oscillator Type
RS-stocknr. 672-0797
FabrikantnummerVM53S3-25.000-2.5/-30+75
FabrikantMERCURY
€ 10,84
Each
Aantal stuks
25MHz ±2.5ppm 10pF SMD Clipped Sinewave -30°C 75°C 1.5mm 5 x 3.2 x 1.5mm TCXO
RS-stocknr. 709-9240
FabrikantnummerTCETBDSANF-10.0MHz
FabrikantTAITIEN
€ 2,76
Each
Aantal stuks
10MHz ±1ppm - SMD Clipped Sinewave -30°C 85°C 2mm 7 x 5 x 2mm TCXO
RS-stocknr. 148-5663
FabrikantnummerLFPTXO000295
FabrikantIQD
€ 49,70
Each
Aantal stuks
10MHz ±1ppm - SMD HCMOS -40°C 85°C 1.8mm 5 x 3.2 x 1.8mm TCXO
RS-stocknr. 146-4005
FabrikantnummerLFPTXO000295
FabrikantIQD
€ 41,366
Each (In a Bag of 10)
Aantal stuks
10MHz ±1ppm - SMD HCMOS -40°C 85°C 1.8mm 5 x 3.2 x 1.8mm TCXO
RS-stocknr. 478-9038
FabrikantnummerLFTVXO009905
FabrikantIQD
€ 8,35
Each
Aantal stuks
16.384MHz ±0.9ppm 15pF 7x5mm SMD HCMOS -20°C 70°C 2mm 7 x 5 x 2mm TCXO
RS-stocknr. 144-2366
FabrikantRS PRO
€ 4,455
Each (In a Pack of 2)
Aantal stuks
32MHz ±0.5ppm - SMD Clipped Sinewave -30°C 85°C 0.7mm 2.5 x 2 x 0.7mm TCXO
RS-stocknr. 144-2362
FabrikantRS PRO
€ 1,49
Each (In a Pack of 2)
Aantal stuks
10MHz ±1.5ppm - SMD Clipped Sinewave -40°C 85°C 0.85mm 2 x 1.6 x 0.85mm TCXO
RS-stocknr. 709-9470
FabrikantnummerR0053-T-069-3
FabrikantTAITIEN
€ 4,01
Each
Aantal stuks
20MHz ±2.5ppm 10pF SMD Clipped Sinewave -30°C 85°C 0.9mm 2.5 x 2 x 0.9mm TCXO
RS-stocknr. 144-2354
FabrikantRS PRO
€ 4,775
Each (In a Pack of 2)
Aantal stuks
10MHz - - SMD CMOS -20°C 70°C 0.95mm 2.5 x 2 x 0.95mm TCXO
RS-stocknr. 144-2368
FabrikantRS PRO
€ 3,845
Each (In a Pack of 2)
Aantal stuks
26MHz ±1.5ppm - SMD Clipped Sinewave -40°C 85°C 0.7mm 2.5 x 2 x 0.7mm TCXO
RS-stocknr. 894-9714
FabrikantnummerLFTVXO063787Bulk
FabrikantIQD
€ 45,90
Each
Aantal stuks
10 → 50MHz ±0.14ppm - SMD HCMOS -40°C 85°C 2mm 5 x 3.2 x 2mm TCXO
RS-stocknr. 732-7591
FabrikantnummerDS32KHZSN#
FabrikantMaxim Integrated
€ 6,25
Each
Aantal stuks
32.768kHz ±7.5ppm - SOIC CMOS -40°C 85°C 2.35mm 10.5 x 7.6 x 2.35mm TCXO
RS-stocknr. 144-2363
FabrikantRS PRO
€ 1,365
Each (In a Pack of 2)
Aantal stuks
26MHz ±1.5ppm - SMD Clipped Sinewave -40°C 85°C 0.85mm 2 x 1.6 x 0.85mm TCXO
RS-stocknr. 148-4324
FabrikantnummerLFTVXO009907
FabrikantIQD
€ 11,18
Each
Aantal stuks
20MHz ±0.9ppm 15pF SMD HCMOS -20°C 70°C 2mm 7 x 5 x 2mm TCXO
RS-stocknr. 144-2370
FabrikantRS PRO
€ 3,845
Each (In a Pack of 2)
Aantal stuks
40MHz ±1.5ppm - SMD Clipped Sinewave -40°C 85°C 0.7mm 2.5 x 2 x 0.7mm TCXO
RS-stocknr. 709-9375
FabrikantnummerR0053-T-039-3
FabrikantTAITIEN
€ 5,52
Each
Aantal stuks
19.2MHz ±2.5ppm 10pF SMD Clipped Sinewave -30°C 85°C 1.2mm 5 x 3.2 x 1.2mm TCXO
RS-stocknr. 478-9044
FabrikantnummerLFTVXO009906
FabrikantIQD
€ 13,85
Each
Aantal stuks
19.44MHz ±0.9ppm - SMD HCMOS -20°C 70°C 2mm 7 x 5 x 2mm TCXO
RS-stocknr. 144-2369
FabrikantRS PRO
€ 4,10
Each (In a Pack of 2)
Aantal stuks
32MHz ±1.5ppm - SMD Clipped Sinewave -40°C 85°C 0.7mm 2.5 x 2 x 0.7mm TCXO
RS-stocknr. 144-2373
FabrikantRS PRO
€ 11,53
Each
Aantal stuks
24.57MHz ±0.028ppm - SMD HCMOS, TTL -40°C 85°C 2mm 7 x 5 x 2mm TCXO
RS-stocknr. 894-9644
FabrikantnummerLFTCXO063715Bulk
FabrikantIQD
€ 30,74
Each
Aantal stuks
10 → 50MHz ±0.28ppm - SMD Clipped Sinewave -40°C 85°C 2.4mm 7 x 5 x 2.4mm TCXO