The R990 (433.92 MHz) and R991 (315 MHz) SAW resonators feature greatly reduced tolerances around the center frequency. Compared to earlier versions, center-frequency tolerance has dropped by 50% and is now only ±25 kHz at 433.92 MHz. The components are mounted on a quartz substrate in hermetically sealed packages and have a footprint of 3 x 3 mm2. Operating-temperature range is from -45°C and +125°C. These SAW resonators are suitable for high-precision wireless transmitters in automotive electronics applications such as remote keyless entry and tire pressure-monitoring systems as well as for many other applications in the ISM bands. This allows transmitters to be configured with very narrow bands, which both increases the sensitivity of the receivers and reduces their susceptibility to interference; it also enables greater transmission ranges. EPCOS AG, Munich, Germany. +49 89 636 09.
Company: EPCOS AG
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