How to Specify

Quartz Crystals

Quartz crystals are the most technically simple product we offer, the package contains only a piece of quartz wafer, all the supporting circuitry needed to create the oscillation must be provided by the customer’s circuit. The quartz wafer inside is cut and shaped to give a resonant frequency within the specified limits. Our quartz crystal part numbers all contain the code XTAL ......


Clock Oscillators

Clock oscillators are the most technically simple oscillator we offer, the package contains a quartz wafer and also the necessary circuit to make the quartz resonate. Consequently by applying the correct power supply to the device a stable output clock waveform is provided at the output pin. Our clock oscillator part numbers all contain the code SPXO. SPXO is an acronym for Simple Packaged Xtal Oscillator ......


VCXOs (Voltage Controlled Crystal Oscillators)

Voltage Controlled Crystal Oscillators give a stable clock output waveform which can be changed via an analogue voltage input. The technology makes use of the pullability of the crystal, its change in frequency due to change in load capacitance. The voltage input is used to vary the load capacitance of the crystal circuit within the oscillator, this gives a very controllable change in output frequency which can be used to tune the device to match the exact frequency required while the circuit is active. We use the code VCXO to denote our voltage controlled quartz crystal oscillator part numbers ......


TCXOs (Temperature Compensated Crystal Oscillators)

Temperature Compensated Crystal Oscillators give much tighter frequency stabilities than standard clock oscillators. The frequency over temperature change of the quartz crystal is internally monitored and compensated for using a similar process to that used inside a VCXO. As a result the frequency change seen on the output is significantly reduced. Some temperature compensated voltage controlled crystal oscillators also give a further fine tuning function to allow the customer to make changes to the output frequency while the circuit is active ......


OCXOs (Oven Controlled Crystal Oscillators)

Oven Controlled Crystal Oscillators offer frequency stabilities even tighter than those offered by a TCXO. The frequency drift of the quartz crystal due to temperature shift is reduced by heating the crystal in an oven and so holding the temperature of the quartz at a fixed point. Traditionally this technology meant physically large devices with heavy power consumptions, however technology is constantly developing and we are proud to offer some of the smallest OCXOs in the world. We use the code OCXO to denote our oven controlled quartz crystal oscillator part numbers ......


GPS Disciplined OCXOs

Advanced clock modules which provide electrical timing functionality for distributed network systems. These units primarily revolve around the 1PPS (pulse per second) timing synchronisation signal produced by a GPS receiver which is derived from transmitted timing information received from GPS satellite systems ......


Rubidium Oscillators

Our IQRB-1 rubidium oscillator is a sub-miniature atomic clock exhibiting rubidium oscillator performance in a 65cc OCXO style package at a standard frequency of 10MHz. This rubidium oscillator offers 100 times less drift than an OCXO and has a short term stability of 0.008ppb/s at 100s, providing significant improvements in performance over OCXOs ......