C-MAC MicroTechnology has introduced two families of high-stability TCXOs (temperature compensated crystal oscillators) with a clipped sinewave output offering current consumption down to 1,5 mA - ideal for low-power applications such as mobile communications and GPS.
Based upon the company's proprietary fourth-order analog temperature compensation ASIC, known as Pluto, the CFPT-9005/9008 and CFPT-9057/9061 devices can be specified with tight frequency stability and low jitter, suiting them for use as Stratum 3 level clocks in SDH/SONET telecommunications systems.
Besides compensating for the standard frequency-to-temperature characteristics of the crystal, the Pluto ASIC uses patented analog circuitry that compensates for nonlinearity and temperature dependence in the pulling response of the oscillator. When matched to the characteristics of an individual oscillator, it delivers high stability over temperature range, even when the oscillator frequency needs to be adjusted by several parts per million to track an external frequency source or to correct for device ageing.
As a result, the oscillators deliver temperature compensation better than ±0,3 ppm from -20 to +70°C without introducing granularity. The absence of granularity and a close-to-carrier phase noise of -95 dBc/Hz at 10 Hz contribute to their low-jitter performance.
Output frequencies can be specified from 8 to 50 MHz and devices can run from supplies down to 2,5 V thanks to the inbuilt DC/DC converter, particularly useful for battery powered applications. Highly linear voltage control of frequency can be specified between ±5 and ±50 ppm. These clipped sinewave output devices, with a peak-to-peak voltage of 1,2 V, typically draw half the current of an HCMOS-output device. Similar devices are also available with HCMOS, ACMOS and sinewave outputs.
The CFPT-9005/9008 comes in tiny 7 x 5 x 2 mm ceramic SMD, whilst the CFPT-9057/9061 is available in industry standard 14 x 9 x 6,1 mm, SOJ-20 profile package. They are offered in 0 to 70°C and full professional -55 to 95°C versions.
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