While conventional XOs require their quartz resonators to be hermetically sealed in a metal-capped package, MEMS resonators can be encapsulated directly within a silicon substrate. MEMS oscillators therefore have a number of advantages over their quartz crystal counterparts, including:
§ smaller package size
§ reliability, due to inherent shock and vibration resistance
§ low prices at high volumes, due to the low manufacturing cost of CMOS wafers.
The IQMS-100 and -200 are SPMO (simple packaged MEMS oscillator) product ranges, designed to replace XOs in automotive applications such as airbag sensors and under-bonnet systems — which require good resistance to shock and vibration — and in portable consumer applications like camcorders — where small size is important. They provide CMOS output with optional tristate or standby function, and are Mil-Std-883F qualified for shock, vibration and solderability.
The IQMS-100 is a standard-specification range with frequency stabilities of 50 to100ppm over operating temperature ranges of –40° to +85°C or –10° to +70°C. Output frequencies from 1 to 125MHz are available. The IQMS-200 range offers tighter frequency stabilities down to 25ppm, and output frequencies up to 200MHz. Both SPMOs come as 2.5 x 2mm, 3.2 x 2.5mm, 5 x 3.2mm or 7 x 5mm SMDs, with supply options of 1.8, 2.5 and 3.3V.
The IQMV-300 and -400 are VCMO (voltage controlled MEMS oscillator) families, intended to replace VCXOs in high-volume, low-cost telecommunications applications including wireless equipment and set-top boxes. Both offer voltage controlled “frequency pulling” options of ±60 or ±240ppm, are stable to 50 or 100ppm over –40° to +85°C or –10° to +70°C temperature ranges, and provide CMOS output.
Output frequency ranges are 1–125MHz for the IQMV-300 and 1–200MHz for the IQMV-400. Supply voltage options are 1.8, 2.5 or 3.3V, and package size options 2.5 x 2mm, 3.2 x 2.5mm or 5 x 3.2mm.
All IQD MEMS oscillators are factory programmable, and can be ordered to meet tight delivery schedules. They are available bulk packed or on tape and reel.
