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Introduction

With over 3 Million part numbers and growing, SmartSearch is an efficient tool to define your configuration and find the part number you need in less than 60 seconds.

The Basics

To get started, input the Frequency you need and select Crystal or Oscillator as your Product Type, then click "Next".

SmartSearch quickly displays the number of part numbers that match your basic criteria, along with several parametric choices for you to further refine your search.

The Details of Your Design

Choose the parametric values you need in any order. It's best to choose the most critical parameters first.

Continue selecting the specifications you need until you have narrowed the number of Matching Part Numbers down to 50 parts or less.

The Results

When the number of Matching Part Numbers is 50 or less, a button will be available to View Matching Part Numbers.

View the list of Matching Part Numbers and click on a part number to view its detail page, where you can download a Data Sheet, process a QuickQuote, view product details, and download compliance docs.

Interface

Expand any parameters that are collapsed by clicking on the "+" icon.

The top 3 parameter values are shown initially for each parameter, based on the part number count. Click "Show All..." to see the rest.

You may clear the parametric filters you have selected by clicking on the "X" next to them in the table of Parameters You've Selected in the right column.

Aging

The systematic change in frequency with time due to internal changes in the quartz crystal or MEMS resonator and/or oscillator. Aging is often expressed as a maximum value in parts per million per year (ppm/year). The following factors effect oscillator aging: adsorption and desorption of contamination on the surfaces of the resonator, stress relief of the mounting and bonding structures, material outgassing, and seal integrity.

Cut/Mode

Mode of Operation

A quartz crystal is designed to vibrate either on its fundamental mode or one of its overtones. For AT cut quartz crystals, overtone modes are at odd frequency harmonics. The mode of operation of a quartz device is one of the factors that will determine the frequency of oscillation.

Fundamental Mode

The first and lowest frequency vibration order a resonator plate will oscillate, determined by the physical dimensions of the plate.

AT Cut Crystal Unit

A classification of a specific type of quartz crystal cut. The AT cut is the most popular cut type manufactured today for crystal units in the MHz range. The AT cut is classified as a thickness-shear bulk acoustic wave (BAW) crystal unit and has a cubic frequency versus temperature with inflection point near room temperature. It is widely popular due to its excellent temperature versus frequency characteristics.

BT Cut Crystal Unit

A classification of a specific type of quartz crystal cut. The BT cut is processed at an angle approximately opposite that of the AT cut and is classified as a thickness-shear crystal unit with a parabolic frequency versus temperature curve with its inflection point near room temperature. Thus, over a given operating temperature range, the BT cut crystal will exhibit a greater frequency shift than the AT cut crystal.

Drive Level

A function of the driving or excitation current flowing through the crystal, drive level is the amount of power dissipation in the crystal, expressed in microwatts or milliwatts. The maximum drive power is the most power the device can dissipate while still maintaining operation with all electrical parameters guaranteed. Drive level should be maintained at the minimum levels necessary to initiate proper start-up and assure steady state oscillation. Excessive drive level can cause poor aging characteristics and crystal damage.

Duty Cycle

The measure of an oscillator's output waveform uniformity. This term, also referred to as Symmetry, is a measurement of the time that the output waveform is in a logic high state, expressed as a percentage (%). This parameter is measured at a specified voltage threshold or at a percentage of the output waveform amplitude.

Equivalent Series Resistance (ESR)

The resistive element, measured in ohms, of a crystal device. At the series resonant frequency of a crystal, the motional inductance (L1) and motional capacitance (C1) are of equal ohmic value but are exactly opposite in phase. The net result is that they cancel one another and only a resistance remains in the series leg of the equivalent circuit. The ESR measurement is made only at the series resonant frequency (FS), not at some predetermined parallel resonant frequency (FL).

Frequency Stability

Crystals

The amount of frequency deviation from the ambient temperature frequency over the operating temperature range. This term is expressed as a minimum and maximum percent (%) or parts per million (ppm) and is determined by the following primary factors: Type of quartz cut and angle of the quartz cut. Some of the secondary factors include: mode of operation, load capacitance, and drive level.

Oscillators

The ability of the oscillator to maintain its design frequency with changing environmental and electrical conditions. Parameters which may affect stability include operating temperature, time (aging), supply voltage, output load, shock and vibration. This parameter is specified with a minimum and maximum frequency deviation, expressed in percent (%) or parts per million (ppm).

Frequency Tolerance

The amount of frequency deviation from the specified nominal frequency at room temperature (25°C). Also called Calibration Accuracy or Calibration Tolerance, this term is expressed as a minimum and maximum percent (%) or parts per million (ppm).

Input Current

The amount of current consumed by an oscillator, typically specified in milliamps (mA) or micro amps (uA).

Load Capacitance

A capacitance, specified in picofarads (pF), presented to the crystal. The parallel load resonant frequency (FL) is a function of the load capacitance.

Operating Temperature Range

The minimum and maximum temperatures that a device can be exposed to during oscillation. Over this temperature range, all of the device specified operating parameters are guaranteed.

Extreme Temperature

Extreme Temperature Logo

Select the Extreme Temperature filter to limit your results to parts that perform beyond -40C to +85C. Any additional parameters you select will further narrow your results.

Oscillator Type

Basic Clock

A type of timing device that consists of a resonator and an oscillator sustaining circuit incorporated into a single package, providing an output waveform at a specified reference frequency.

Temperature Compensated Voltage Controlled Clock

A type of timing device that consists of a resonator and an oscillator sustaining circuit incorporated into a single package, providing an output waveform at a specified reference frequency. The device contains circuitry for both compensating the frequency variation according to the oscillator's temperature and a voltage variable modulation circuit.

Temperature Compensated Clock

A type of timing device that consists of a resonator and an oscillator sustaining circuit incorporated into a single package, providing an output waveform at a specified reference frequency. The device contains circuitry for compensating the frequency variation according to the oscillator's temperature.

Spread Spectrum Clock

A type of timing device that consists of a resonator and an oscillator sustaining circuit incorporated into a single package, providing an output frequency that is intentionally modulated in order to reduce the electromagnetic interference (EMI) on the output clock signal.

Voltage Controlled Clock

A type of timing device that consists of a resonator and a voltage variable modulation oscillator circuit incorporated into a single package, providing an output waveform at a specified frequency determined by an external control voltage.

Output Logic Type

Clipped Sinewave

An oscillator output signal characterized by driving the oscillator output circuit into a clipped mode so as to achieve a saw-tooth shaped waveform.

CML

A type of differential output logic, called Current Mode Logic. This oscillator output topology utilizes a constant current source open-drain differential pair with a voltage swing across an output load of 50 ohms to VDD.

CMOS

A type of single ended output logic called Complementary Metal Oxide Semiconductor. The oscillator output topology utilizes a combination of p and n channel transistors forming complementary elements with a voltage swing from ground to VDD (rail to rail) across a capacitive output load.

HCSL

A type of differential output logic, called High Speed Current Steering Logic. The oscillator output topology utilizes a constant current source open-drain differential pair with a voltage swing across an output load of 50 ohms to ground.

LVDS

A type of differential output logic, called Low Voltage Differential Signaling. The oscillator output topology utilizes a constant current source differential pair with a voltage swing across an output load of 100 ohms between the complementary outputs of the oscillator.

LVPECL

A type of differential output logic, called Low-Voltage Positive Emitter-Coupled Logic. The oscillator output topology utilizes an open collector transistor differential pair with a voltage swing into an output load of 50 ohms to VDD - 2.0VDC.

TTL

A type of single ended output logic called Transistor-Transistor Logic. The oscillator output topology utilizes a combination of bipolar junction transistors to achieve switching and maintain logic states with a voltage swing across a resistive and capacitive output load.

Package Type

Thru-hole

A package that is mounted by the insertion of pins into holes of a printed circuit board.

SMD

An acronym for Surface Mount Device, it is a package with pads that mount to the surface of a printed circuit board.

Rise/Fall Time

Rise Time

The transition time, expressed in picoseconds (pSec), from a logic low to a logic high of an oscillator output clock signal, measured at specified voltage thresholds or at specified percentages of the output waveform amplitude.

Fall Time

The transition time, expressed in picoseconds (pSec), from a logic high to a logic low of an oscillator output signal, measured at specified voltage thresholds or at specified percentages of the output waveform amplitude.

RMS Phase Jitter

Also called Offset Jitter, a time domain oscillator measurement derived from phase noise and specified in picoseconds (pSec) as a maximum root mean square (RMS) value. RMS phase jitter is the integration of the phase noise over a given offset bandwidth.

Spread Spectrum

Oscillators where the output frequency is primarily controlled by a MEMS or quartz resonator and an integrated complementary metal-oxide semiconductor (CMOS) circuit. Spread spectrum oscillators have the output frequency intentionally modulated in order to reduce the electromagnetic interference (EMI) on the output signal.

Start Up Time

The specified time from oscillator power-up to steady state oscillation.

Supply Voltage

The DC input voltage necessary for oscillator operation, specified in volts.