ADI introduces low power rf transceiver for short range wireless systems

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Analog Devices has introduced an integrated, low power rf transceiver for operation in the 2.4GHz industrial, scientific and medical (ISM) frequency band. The latest addition to ADI's rfic range, the ADF7241 rf transceiver is designed to enable support of the standard IEEE 802.15.4 PHY protocol at 250Kb/s on a single chip.

The transceiver's low power consumption of 19mA in receive mode and 21.5mA in transmit mode makes it suitable for battery-powered systems, such as wireless sensor networks, automatic meter reading, industrial wireless control, wireless audio and video, consumer electronics, and ZigBee applications. According to ADI, the receive path of the ADF7241 rf transceiver is based on a zero-IF architecture which the company says enables 'best in class' blocking and high selectivity performance. The transmit path is based on a closed loop voltage controlled oscillator modulation scheme, which is designed to provide a high modulation quality. It also features a flexible port rf interface with support for switched antenna diversity. In order to optimise the system power consumption, the ADF7241 rf transceiver incorporates a robust, low power, custom 8bit processor that supports a number of rf functions, including radio control and packet management. The integrated 8bit processor is firmware that can be programmed to execute firmware modules or system upgrade patches from internal RAM memory, which provides the flexibility to respond to protocol standard evolution and maintain system robustness. The ADF7241 rf transceiver is equipped with a serial port interface for high throughput efficiency as well as a bidirectional serial port. The transceiver can be designed into system designs with ADI's ADSP-21xx, SHARC, TigerSHARC , and Blackfin Processors.