The concept of SPXO changes! SPXO with temperature compensated circuit

Crystal oscillators are classified into several types according to its accuracy or circuit.

Among those, the most simple crystal oscillator with no compensation or control of temperature is called SPXO (Simple Packaged Crystal Oscillator). While a crystal oscillator, which is designed with built in temperature compensating circuit in order to possess proper temperature characteristic over wide temperature ranges, is called TCXO (Temperature Compensated Crystal Oscillator).

Outgoing from this classification NDK has developed a new SPXO of hold over frequency tolerance as tight as +/- 15ppm (-40°C to +85°C) by building a temperature compensating circuit in it.

Up to now this stability can only be reached by using TCXO or using high precision crystal resonators with complicated temperature compensated circuit. Using the newly developed SPXO eliminates the need for complicated circuit design.

CMOS output despite temperature compensated circuit:

The small sized TCXO with temperature compensated circuit (e.g. for mobile phones) generally has a clipped sine wave output. When CMOS output is needed it is necessary to add circuitry to convert the clipped sine wave to CMOS.

However, as this SPXO outputs directly CMOS the waveform processing circuit becomes unnecessary and minimizes circuit space which has turned out to be a big merit. CMOS circuits power consumption is lower than TTL or other circuits. The performance is enhanced by developing the majority of the logic IC with a CMOS structure.

Wide operating temperature range:

This SPXO corresponds to the wide operating temperature range from -40° to +85°C keeping high precision of ±15ppm. Also it corresponds to supply voltage +1.8V so it is possible to prevent overheat due to heat generation by miniaturization and high density mounting conversion of the equipment and lower power consumption.

If the above has piqued your interest, please don’t hesitate to contact CODICO for more details!


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