Quartz Crystals Eliminate Need For PLL

IQD has launched a range of quartz crystals which can operate in the fundamental mode up to 200 MHz. The quartz crystals are housed in hermetically-sealed 2.5 mm x 2 mm x 0.6 mm (IQXC-152) and 2 mm x 1.6 mm x 0.5 mm (IQXC-153) ceramic four-pad packages. Two of the pads are grounded to the metal lid to improve EMI resistance.


In the higher frequency range, 70 MHz to 200 MHz, the frequency tolerance can be as low as ±30 ppm and the stability is also ±30 ppm over the full industrial operating temperature range of -40°C to +85°C with capacitance load ranging from 8 pF to 30 pF.

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The IQXC-152 and IQXC-153 enables design engineers to use higher frequencies in the fundamental mode, which eliminates the need to use a PLL or a tank circuit picking up the 3rd, 5th or 7th harmonics. A higher starting frequency can also be used when looking to generate for example 2.4 GHz which cuts down on the jitter/phase noise in the circuit. More information is available on the IQXC-152 and IQXC-153 datasheets.


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