Oscillators

Suntsu Crystal Oscillators are available in through-hole or surface-mount packaging with many sizes to choose from. We offer a wide frequency range and many different voltages and logic options. Pick out a standard part number from the data sheets listed below or contact our sales team to request any custom parameters that you desire and we will design to your specific needs.

A Crystal Oscillator is an electronic circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency. This frequency is commonly used to keep track of time, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers.

SeriesImageLogicPackageStability ToVoltage(s)FrequencyReelKey FeatureDatasheet
SXO11CCMOS1.6X1.2 CERAMIC SMD (4 PAD) OSCILLATOR±20ppm1.8V, 2.5V, 3.3V1.000MHz - 80.000MHz3KUltra-Miniature Package
SXO21CCMOS2.0X1.6 CERAMIC SMD (4 PAD) OSCILLATOR±20ppm1.8V, 2.5V, 3.3V1.000MHz - 60.000MHz3KUltra-Miniature Package
SXO22CCMOS2.5X2.0 CERAMIC SMD (4 PAD) OSCILLATOR±20ppm1.8V, 2.5V, 3.3V32.768kHz, 1.000MMz - 110.000MHz3KUltra-Miniature Package
SQG22CCMOS2.5X2.0 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 250.000MHz3KProgrammed Oscillator, Low Jitter
SQG22PLVPECL2.5X2.0 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 1500.000MHz3KProgrammed Oscillator, Low Jitter
SQG22LLVDS2.5X2.0 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 1500.000MHz3KProgrammed Oscillator, Low Jitter
SXO32CCMOS3.2X2.5 CERAMIC SMD (4 PAD) OSCILLATOR±20ppm1.8V, 2.5V, 3.3V32.768kHz, 1.000MHz - 133.000MHz3KUltra-Miniature Package
SUO32PLVPECL3.2*2.5 CERAMIC SMD(6PAD) OSCILLATOR±20ppm3.3V80.000 - 170.000MHz3KUltra Low Jitter
SUO32LLVDS3.2*2.5 CERAMIC SMD(6PAD) OSCILLATOR±20ppm3.3V80.000 - 170.000MHz3KUltra Low Jitter
SQG32CCMOS3.2x2.5 CERAMIC SMD(6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 250.000MHz3KMiniature package, quick turn, low jitter, wide frequency range
SQG32PLVPECL3.2x2.5 CERAMIC SMD(6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 1500.000MHz3KMiniature package, quick turn, low jitter, wide frequency range
SQG32LLVDS3.2x2.5 CERAMIC SMD(6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 1500.000MHz3KMiniature package, quick turn, low jitter, wide frequency range
SXO53CCMOS5.0X3.2 CERAMIC SMD (4 PAD) OSCILLATOR±20ppm1.8V, 2.5V, 3.3V32.768kHz, 1.000MHz - 160.000MHz1KMiniature Package
SXO53PLVPECL5.0X3.2 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V20.000MHz - 160.000MHz1KLow Jitter
SXO53LLVDS5.0X3.2 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V20.000MHz - 160.000MHz1KLow Jitter
SXO53HHCSL5.0X3.2 CERAMIC SMD (6 PAD) OSCILLATOR±25ppm2.5V, 3.3V100MHz, 125MHz1KLow Jitter, Miniature Package
SUO53PLVPECL5.0*3.5 CERAMIC SMD(6PAD) OSCILLATOR±20ppm3.3V80.0000 - 170.000MHz1KUltra Low Jitter
SUO53LLVDS5.0*3.5 CERAMIC SMD(6PAD) OSCILLATOR±20ppm3.3V80.0000 - 170.000MHz1KUltra Low Jitter
SQC53CCMOS5.0X3.2 CERAMIC SMD (4 PAD) OSCILLATOR±20ppm3.3V, 5.0V1.000MHz - 133.000MHz1KQuick Turn, Programmed Oscillator
SQG53CCMOS5.0X3.2 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 250.000MHz1KProgrammed Oscillator, Low Jitter
SQG53PLVPECL5.0X3.2 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 1500.000MHz1KProgrammed Oscillator, Low Jitter
SQG53LLVDS5.0X3.2 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V10.000MHz - 800.000MHz1KProgrammed Oscillator, Low Jitter
SXO75CCMOS7.0X5.0 CERAMIC SMD (4 PAD) OSCILLATOR±20ppm1.8V, 2.5V, 3.3V32.768kHz, 1.000MHz - 200.000MHz1KStandard Package
SXO75PLVPECL7.0X5.0 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V20.000MHz - 260.000MHz1KLow Jitter, Wide Frequency Range.
SXO75LLVDS7.0X5.0 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V20.000MHz - 260.000MHz1KLow Jitter, Wide Frequency Range
SXO75HHCSL7.0X5.0 CERAMIC SMD (6 PAD) OSCILLATOR±25ppm2.5V, 3.3V100MHz, 125MHz1KLow Jitter
SUO75PLVPECL7.0*5.0 CERAMIC SMD(6PAD) OSCILLATOR±20ppm3.3V80.000 - 170.000MHz1KUltra Low Jitter
SUO75LLVDS7.0*5.0 CERAMIC SMD(6PAD) OSCILLATOR±20ppm3.3V80.000 - 170.000MHz1KUltra Low Jitter
SQG75CCMOS7.0X5.0 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 250.000MHz1KProgrammed Oscillator, Low Jitter
SQG75PLVPECL7.0X5.0 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 1500.000MHz1KProgrammed Oscillator, Low Jitter
SQG75LLVDS7.0X5.0 CERAMIC SMD (6 PAD) OSCILLATOR±20ppm2.5V, 3.3V8.000MHz - 1500.000MHz1KProgrammed Oscillator, Low Jitter
SQC75CCMOS7.0X5.0 CERAMIC SMD (4 PAD) OSCILLATOR±20ppm3.3V, 5.0V1.000MHz - 133.000MHz1KQuick Turn, Programmed Oscillator
SXOHSCCMOS/TTL8 PIN DIP OSCILLATOR±20ppm1.8V, 2.5V, 3.3V, 5.0V32.768kHz - 155.520MHzN/AWide Frequency Range
SXOFSCCMOS/TTL14 PIN DIP OSCILLATOR±20ppm2.5V, 3.3V, 5.0V32.768kHz - 150.000MHzN/AWide Frequency Range
SXOPJCCMOS14X9.8 PLASTIC SMD (J-LEAD) OSCILLATOR±20ppm3.3V, 5.0V1.000MHz - 125.000MHz1KPlastic J-Lead Package
SQCPJCCMOS14X9.8 PLASTIC SMD (J-LEAD) OSCILLATOR±20ppm3.3V, 5.0V1.000MHz - 133.000MHz1KQuick Turn, Programmed Oscillator, J-Lead package
SUO22PLVPECL2.5X2.0 CERAMIC SMD (6PAD) OSCILLATOR±20ppm2.5V, 3.3V13.500MHz - 156.250MHz3KUltra Low Jitter
SUO22LLVDS2.5X2.0 CERAMIC SMD (6PAD) OSCILLATOR±20ppm1.8V, 2.5V, 3.3V13.500MHz - 156.250MHz3KUltra Low Jitter
SQC32CCMOS3.0X2.5 CERAMIC SMD (4PAD) OSCILLATOR±20ppm3.3V, 5.0V1.000MHz - 133.000MHz1KQuick Turn, Programmed Oscillator

Quick Summary

Features Benefit Manufacturing Location(s) Monthly Capacity
• Wide range of frequencies
• No oscillation circuit design required
• Programmable options
• Low phase noise
• Form factor down to 1.6 x 1.2mm
• Custom configurations available
• China
• Taiwan
• South Korea
• >5M units

What Is an Oscillator?

An oscillator is the electronic circuit found within a device. It produces an output signal with consistent and continuous amplitude and a specific frequency. Given that an oscillator will generate waveforms at generally frequencies, it is also commonly referred to as a waveform generator for electronics. An electronic oscillator is often found in digital watches and clocks, computers and many complex electronic systems. The AC signals at specific frequencies generated by an electronic oscillator are widely used for radio or television signal transmission.

How Oscillators Work

The main role of an electronic oscillator is to convert direct current (DC) power to an alternating current (AC) signal for use in operating an electronic device. The form of the signal produced by an electronic oscillator is typically a sine or square wave from a periodic electronic signal. When DC power is connected to the electronic circuit, this is sufficient input for the oscillator to produce an AC signal at a specific frequency with the help of a transistor or a vacuum tube. On the other hand, an amplifier, which works in conjunction with an oscillator, requires an external input to generate a signal.

Typical Oscillator Types

The two major types of electronic oscillators based on the types of waveforms that they generate are linear and nonlinear oscillators. The linear electronic oscillators are also called harmonic oscillators, which produce a sinusoidal output. The nonlinear electronic oscillators are also called relaxation oscillators and produce a non-sinusoidal output. In terms of the types of components of an oscillator, the major classifications are RC, LC and crystal. Oscillators are also characterized by the level of frequency that they generate, which ranges from low to high.

Harmonic Oscillator

A harmonic oscillator is a linear oscillator that is most commonly used as an electronic amplifier. They use the feedback resistor including electronic amplifiers in order to increase negative resistance. This type of harmonic oscillators produces a sinusoidal output, which is a continuous wave as part of a smooth periodic oscillation.

Feedback Oscillator

A feedback oscillator is a type of harmonic oscillator that is generally characterized according to the particular type of frequency selective filter used in its feedback loop. The categories of feedback oscillators include RC, LC and crystal oscillators. These types of oscillators incorporate a feedback network sufficient to satisfy the requirements for oscillations within the oscillator circuit.

Negative-Resistance Oscillator

Unlike the feedback oscillator, a negative-resistance oscillator does not include a feedback network. The typical range of a negative-resistance oscillator is at or above the microwave range because a feedback oscillator generally cannot function as reliably at these higher frequencies due to the phase shift in their feedback path. The resonant circuit of a negative-resistance oscillator connects across an electronic device with negative differential resistance. Power is supplied to the resonant circuit from a DC signal. Ultimately, oscillations at the desired resonant frequency are produced when the internal loss resistance of the electronic circuit is canceled out by the negative resistance.

Voltage-Controlled Oscillator (VCO)

A voltage-controlled oscillator (VCO) is designed so that the device’s set frequency can be changed within a specified range by varying the current or voltage applied to the oscillator. This type of oscillator is most commonly found in phase-locked loops, which allow the frequency of the VCO to be set in conjunction with another oscillator. When used in the transmission and receipt of radio signals, a VCO usually has a varactor diode added to the resonator or oscillator. An increase in the input voltage for a VCO results in a sped-up charging rate of the capacitor.

Crystal Oscillators

The crystal oscillator is a mainstay in the design and manufacturing of a broad range of consumer electronic products. For a crystal oscillator, the specific frequencies produced can vary from 32.768kHz to over 150MHz. At higher frequencies, a crystal oscillator is more likely to be used for the transmission of radio signals. Crystal oscillators are commonly found in many of Suntsu’s high-quality electronic devices and products because of their properties for maintaining accurate and stable frequencies despite external changes. In terms of mechanical operations, the mechanical vibrations of the quartz crystal resonator determine the specific frequency that is generated from the crystal oscillator.

Surface Acoustic Wave (SAW) Oscillators

A surface acoustic wave (SAW) oscillator is essential for producing the radio signals that are required for cellphones. What makes a SAW oscillator distinct from other forms of oscillators is that they rely on acoustic waves from the surface of a material for the processing of signals. In a SAW oscillator, the input transducer converts the electric signal into acoustic waves. The waves are converted again into signals by an output transducer after traveling through a solid propagation medium.

Crystal Oscillator Circuit

The differences between crystal vs. oscillator options without quartz crystal are expressed in the function of the end device, with crystal oscillators being the popular choice for many devices that require a precise and stable frequency. Crystal oscillator circuits are ubiquitous with top-notch and reliable performance in electronic devices, which is why they are so widely incorporated into products sold by Suntsu. They rely on the piezoelectric effect of quartz crystals to help keep electronic devices working properly and efficiently over their lifespan. The application of an AC signal to a quartz crystal causes it to vibrate, which produces a specific signal output. The resonant frequency of a quartz oscillator circuit experiences only slight variations due to changes in external temperatures or over the lifespan of the quartz crystal oscillator.

Microelectromechanical System (MEMS) Oscillators

Microelectromechanical system (MEMS) oscillators are specifically used within timing devices. The MEMS resonators within the oscillator are what help set the desired frequencies, which tend to be much higher in MEMS oscillators than for other electronic devices. MEMS oscillators are considered a cutting-edge innovation from quartz crystal oscillators and have been commonly incorporated into commercial devices since 2006. They boast improved resistance to mechanical stresses and variations in external temperatures, which increases the stability of their frequencies.

Colpitts Crystal Oscillator

A Colpitts crystal oscillator relies on a combination of inductors and capacitors to generate and maintain its continuous oscillation at the desired frequency level. What distinguishes the Colpitts oscillator is the fact that its voltage divider consists of two capacitors that operate in series resonance.

Pierce Crystal Oscillator

A Pierce crystal oscillator is an electronic oscillator that is derived from the Colpitts crystal oscillator. Almost all of the oscillators found in digital IC clock oscillators are of the Pierce variety. This is because the composition of this clock oscillator makes it a fairly simple oscillator circuit in terms of the parts required for its manufacture. It contains only one digital inverter and resistor as well as two capacitors and the quartz crystal. One of the reasons why Suntsu is able to provide such high-quality and top-performing electronic devices at such reasonable price points is that the manufacturing costs of this highly effective type of oscillator are significantly less than the cost of more material-intensive oscillators and electronic circuits.

CMOS Crystal Oscillator

A complementary metal-oxide semiconductor logic (CMOS) crystal oscillator circuit is especially useful for clock recovery, frequency synthesis, phase-locked loop (PLL), synthesizing, system references, clock translation and multiplexing. CMOS technology is used to design IC, and quartz crystal is used as the source clock. This type of crystal oscillator features a controlled rise (output waveforms changing from a low voltage level to a much higher voltage level) and fall (output waveforms reverting back to a low voltage level from a higher voltage level) times thanks to the high-speed CMOS, and the waveform is a rectangular shape.

Microprocessor Oscillator

In almost all microprocessors, there are two oscillator pins, OSC1 and OSC2, that attach to an oscillator circuit, which produces square wave pulses and helps determine the device’s frequency based on the vibrations of the activated quartz crystal. That specific device frequency is how the device’s processor receives the signals and information that it needs to function.

Oscillator Applications

An oscillator has the capacity to run a long list of electronic devices that all depend on the stability of a specific frequency to work as expected. Some of the most common applications of oscillators include quartz watches, radio signal transmitters, audio systems, video systems, computers, inverters, metal detectors, microprocessors, water meter, telecommunication, based station, repeater, alarms, rubidium oscillator atomic clocks and lighting systems.

Oscillator Circuits

Oscillator circuits are self-sustaining in that they produce a periodic waveform at a constant rate and at a stable frequency. The losses in the feedback resonator circuit of an oscillator are overcome with an inductor or capacitor and from the application of a DC signal to the resonator at a precise frequency level. Because the oscillator circuit functions as an amplifier to produce an output frequency from positive feedback, it does not require an input signal to produce the desired frequency.

Oscillator Resonance

An oscillator at a resonant frequency is also sometimes called a tuned circuit. This occurs when the capacitive and inductive reactance of the oscillator circuit are the same, which means that the resistance of the circuit opposes the current’s flow. As a result, the current remains in phase with the circuit’s voltage without producing any phase shift. At a resonant frequency, the application of an oscillating force to the circuit allows for oscillations at a higher amplitude as compared to the resulting oscillations from the same level of force at non-resonant frequencies.

Oscillator Frequency Value

The oscillator frequency value is typically assessed and measured in Hertz (Hz) from a formula that divides the wavelength into the velocity. This tracks the oscillator waveform output in the number of oscillation cycles per second. The desired frequency value of an oscillator depends on its particular purpose and will bet set in the manufacturing process of the oscillator.

Oscillator Gain Without a Feedback Resistor

A feedback resistor sets the bias of the oscillator circuit and determines its stability. A feedback resistor is also called an Rƒ. In order for a feedback resistor in an oscillator to produce negative feedback, it feeds back part of the output signal to the negative terminal of the amplifier.

Frequently Asked Questions

In an oscillator, there are two major options for the different types of circuits that can be incorporated into a harmonic or linear oscillator in addition to the quartz crystal oscillator circuits. Resistor-capacitor (RC) circuits are preferred when a lower frequency is needed. Conversely, inductor-capacitor (LC) circuits are generally used when a higher frequency is needed.

The overall frequency stability of an oscillator is specified by setting up and operating the device within a range of parameters that are specific to the function of the oscillator. Those parameters generally include a precise temperature for the calibration of the oscillator’s frequency tolerance, reflow and first-year aging as well as specifications for the oscillator’s output load, supply voltage, shock and vibration settings.

For an oscillator, the frequency stability and operating temperature range options are indicated on the datasheet for each specific product series offered by Suntsu. Complying with these range specifications when setting up and using a device with an oscillator is essential to ensuring that the oscillator produces and maintains its desired frequency over the expected lifetime of the electronic device in which it is operating. The frequency stability can be ±10pm~100pm based on operating temperature option of -40~85°C.

A tri-state output option for an oscillator refers to the use of the tri-state pin to control the oscillator’s output function. This means that the oscillator’s output can be controlled by external power supply. The logic level of the output enable pin for the oscillator determines whether the oscillator is at a low frequency or a high impedance state. There are three states, enable, disable, and no connection.

Oscillator aging refers to very small changes in the frequency of the crystal oscillator over the lifespan of the device. Aging in crystal oscillators can be accelerated by changes in the physical size of the crystal in its manufacturing and packing processes or stress-induced from changes in temperatures and other environmental factors. The more stress and external pressures applied to an oscillator outside of its specified range, the faster the acceleration of the oscillator aging process and reduction in the usable lifespan of the electronic device. For high-quality crystal oscillators, such as OCXO offered by Suntsu, they typically register very low aging rates of ±0.1ppb per day, and standard crystal oscillator aging rate is ±3ppm per year.

Phase jitter in an oscillator is also often referred to as timing jitter. When the signal approaches the oscillation frequency, the phase noise level generally increases in an electronic oscillator. The RMS phase jitter for an oscillator is a time measurement expressed in picoseconds (pSec) and refers to how phase jitter is calculated from phase noise. Within an oscillator, the phase noise components move the device signal to adjacent frequencies, which produces various noise sidebands. The phase noise from an oscillator usually includes white noise and lower-frequency flicker noise.

The tight duty cycle for an oscillator assesses the uniformity or symmetry of the output waves. To have completely perfect waveforms in terms of symmetry, the waveform would be in a perfect logic high state exactly 50% of the time and in a logic low state the other 50% of the time. This is expressed as 50/50%. A measurement of 45/55% is considered a tight duty cycle in terms of the symmetry of the output waves for an oscillator.

The crystal oscillator output will differ based on the variations in the loads applied to the oscillator’s output ports. CMOS oscillator has commonly used with 15pF load, but the demand of LVPECL and LVDS has been increased because of the requirement high speed switching. For TCXO, clipped sinewave output is standard, and but CMOS can be used. The application of the load to an oscillator can be largely controlled for most uses of electronic devices, which means that load sensitivity in most high-quality oscillators is not a major concern. Each unit has parameters for the types of output loads and their maximum values to connect properly to the oscillator circuit. It is vital to adhere to the output load specification range for a specific oscillator and to refrain from exceeding its output load capacity so that the oscillator is able to vibrate steadily at a consistent frequency for the expected duration of its lifetime.

In terms of the process for a crystal oscillator to start, the immediate frequency generated is not stable or constant. In turn, the clock frequency of the crystal oscillator is not stable during this initial period. As a result, some microcontrollers rely on an oscillator start-up timer (OST) so that the electronic device remains in its reset mode until the crystal oscillator is warmed up and operating at its desired frequency. The time that it takes the crystal oscillator to achieve this stable frequency state is the oscillator’s start-up time. Depending on the particular oscillator that is operating within a device, the start-up time will vary and is specified on the datasheet for the individual product.

A crystal oscillator has polarity because the integrate circuit is embedded. Generally, CMOS output crystal oscillator has four pads configurations. They require power supply, ground, output, and tri-state. The differential oscillators like LVPECL and LVDS oscillators require 6pads to add the differential output.

A crystal oscillator can fail for a variety of reasons, but the quality of the quartz crystal materials used in manufacturing a crystal oscillator and the precision and accuracy of the manufacturing process can have a major impact on the effectiveness and longevity of a crystal oscillator. That is why the crystal oscillators found in all of Suntsu’s electronic devices and products are held to the strictest standards for design and manufacturing. During the oscillation of a quartz crystal oscillator, the electric signal transmits from one of the two capacitors to the quartz crystal and then back to the other capacitor in a continuous loop. If the equivalent resistance of used crystal is increased due to the defect of quartz crystal and become higher than the negative resistance of oscillator circuit, the oscillation process may never even start.

The components of a crystal oscillator are essential to the proper function and stability of the oscillator, which is why Suntsu prides itself on offering products with oscillators that have been properly manufactured and protected from external stresses and environmental changes. Typically, a crystal oscillator will consist of a ceramic package, integrate circuit with quartz crystal. IC was bonded with wire and quartz crystal is attached by conductive epoxy on the package, and then the whole package is sealed hermetically under N2 condition.

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