San Jose, Calif. Micrel Inc. is claiming the industry's first programmable receiver with a jam avoidance feature. The MICRF218, which is part of Micrel's QwikRadio family, is targeted at garage door openers and tire pressure monitoring systems. According to the company, the MICRF218 is the first integrated ASK/OOK receiver with selectable IF bandwidth for 300- to 450-MHz operation.
The MICRF218 receiver system can avoid jamming by switching to an alternate frequency. The receiver can accommodate two reference crystals with the use of an external switch. It features a fully integrated IF section with built-in image rejection. The IF section offers dual IF bandwidths that are externally selectable.
A wide IF bandwidth can be chosen for backward compatibility with older transmitters that are LC-based. The wide IF bandwidth allows the receiver to capture a signal that slightly deviates from the intended communication frequency. Or a narrow IF bandwidth that operates with a crystal-based transmitter to improve selectivity to increase communication distance may be selected. There is no sacrifice of performance with either option, said Micrel.
For tire pressure monitoring system applications, a -40 to +125°C operating temperature range can cause significant frequency deviation in the transmitter. The MICRF218AYQS in wide IF bandwidth mode can accommodate transmitter signal drift due to temperature changes in the operating environment.
Pricing: Starts at $1.71 in quantities of 10,000
Availability: Available in volume production.
Product information: MICRF218
Micrel Inc., www.micrel.com