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 Prix Output Frequency Frequency Stability Load Capacitance Package Type Output Level Minimum Operating Temperature Maximum Operating Temperature Height Dimensions Oscillator Type
N° de stock RS 894-9635
Référence fabricantLFTCXO063711Bulk
MarqueIQD
30,74 €
Each
Unité
10 → 50MHz ±0.28ppm - SMD HCMOS -40°C 85°C 2.4mm 7 x 5 x 2.4mm TCXO
Nouveau
N° de stock RS 205-3502
Référence fabricantX1G005441021612
MarqueEpson
1,355 €
Each (In a Pack of 2)
Unité
48MHz +/- 0.5 ppm, +/- 1.5 ppm 11pF 2.0x1.6 ceramic package - - - - - TCXO
N° de stock RS 146-3950
Référence fabricantLFTVXO009917
MarqueIQD
13,014 €
Each (In a Bag of 100)
Unité
20MHz ±0.5ppm 15pF SMD HCMOS -40°C 85°C 2mm 7 x 5 x 2mm TCXO
N° de stock RS 732-7591
Référence fabricantDS32KHZSN#
6,30 €
Each
Unité
32.768kHz ±7.5ppm - SOIC CMOS -40°C 85°C 2.35mm 10.5 x 7.6 x 2.35mm TCXO
N° de stock RS 709-9423
Référence fabricantR0053-T-052-3
MarqueTAITIEN
4,52 €
Each
Unité
20MHz ±2.5ppm - SMD Clipped Sinewave -30°C 85°C 1mm 3.2 x 2.5 x 1mm TCXO
N° de stock RS 478-9038
Référence fabricantLFTVXO009905
MarqueIQD
8,35 €
Each
Unité
16.384MHz ±0.9ppm 15pF 7x5mm SMD HCMOS -20°C 70°C 2mm 7 x 5 x 2mm TCXO
Nouveau
N° de stock RS 205-3505
Référence fabricantX1G005421020312
MarqueEpson
0,859 €
Each (On a Reel of 250)
Unité
19.2MHz +/- 0.5 ppm, +/- 1.5 ppm 11pF 2.0x1.6 ceramic package - - - - - TCXO
N° de stock RS 178-2699
Référence fabricantTT32M327K50ITR
MarqueCTS
4,08 €
Each (In a Pack of 2)
Unité
32.76kHz ±5ppm - SMD HCMOS -40°C 85°C 1.4mm 3.28 x 2.5 x 1.4mm TCXO
Nouveau
N° de stock RS 205-3504
Référence fabricantX1G005441031612
MarqueEpson
1,355 €
Each (In a Pack of 2)
Unité
48MHz +/- 0.5 ppm, +/- 1.5 ppm 11pF 2.0x1.6 ceramic package - - - - - TCXO
N° de stock RS 894-9644
Référence fabricantLFTCXO063715Bulk
MarqueIQD
30,74 €
Each
Unité
10 → 50MHz ±0.28ppm - SMD Clipped Sinewave -40°C 85°C 2.4mm 7 x 5 x 2.4mm TCXO
N° de stock RS 709-9375
Référence fabricantR0053-T-039-3
MarqueTAITIEN
5,52 €
Each
Unité
19.2MHz ±2.5ppm 10pF SMD Clipped Sinewave -30°C 85°C 1.2mm 5 x 3.2 x 1.2mm TCXO
N° de stock RS 709-9379
Référence fabricantR0053-T-040-3
MarqueTAITIEN
2,29 €
Each
Unité
20MHz ±0.5ppm - SMD Clipped Sinewave -30°C 85°C 1.2mm 5 x 3.2 x 1.2mm TCXO
N° de stock RS 148-4324
Référence fabricantLFTVXO009907
MarqueIQD
11,18 €
Each
Unité
20MHz ±0.9ppm 15pF SMD HCMOS -20°C 70°C 2mm 7 x 5 x 2mm TCXO
Nouveau
N° de stock RS 205-3496
Référence fabricantX1G005441020612
MarqueEpson
0,791 €
Each (On a Reel of 250)
Unité
38.4MHz +/- 0.5 ppm, +/- 1.5 ppm 11pF 2.0x1.6 ceramic package - - - - - TCXO
N° de stock RS 672-0769
Référence fabricantVM53S3-10.000-2.5/-30+75
MarqueMERCURY
9,30 €
Each
Unité
10MHz ±2.5ppm - SMD Clipped Sinewave -30°C 75°C 1.5mm 5 x 3.2 x 1.5mm TCXO
N° de stock RS 709-9394
Référence fabricantR0053-T-044-3
MarqueTAITIEN
1,81 €
Each
Unité
12.8MHz ±1ppm - SMD Clipped Sinewave -30°C 85°C 1mm 3.2 x 2.5 x 1mm TCXO
N° de stock RS 148-5683
Référence fabricantLFTVXO009915
MarqueIQD
16,30 €
Each
Unité
16.384MHz ±0.5ppm 15pF SMD HCMOS -40°C 85°C 2mm 7 x 5 x 2mm TCXO
Nouveau
N° de stock RS 205-3492
Référence fabricantX1G005441030412
MarqueEpson
1,355 €
Each (In a Pack of 2)
Unité
26MHz +/- 0.5 ppm, +/- 1.5 ppm 11pF 2.0x1.6 ceramic package - - - - - TCXO
N° de stock RS 171-2672
Référence fabricantASTXR-12-38.400MHZ-514054-T
MarqueAbracon
2,225 €
Each (In a Pack of 2)
Unité
38.4MHz ±0.5ppm - SMD Clipped Sinewave -40°C 85°C 0.8mm 2.5 x 2 x 0.8mm TCXO
Nouveau
N° de stock RS 205-3503
Référence fabricantX1G005441031612
MarqueEpson
0,791 €
Each (On a Reel of 250)
Unité
48MHz +/- 0.5 ppm, +/- 1.5 ppm 11pF 2.0x1.6 ceramic package - - - - - TCXO