Two RF transceivers from Analog Devices have been designed for smart-grid and home- and building-automation applications. Smart-grid technology measures how much power is consumed—and at what time and price—to save energy, reduce costs and make the delivery of electricity from utility companies to consumers more reliable. The ADF7022 and ADF7023 transceivers can be used in applications that operate on the short-range, licence-free ISM (industrial, science and medical) band for remote data measurement. Typical applications include industrial monitoring and control, wireless networks and telemetry systems, security systems, medical devices and remote controls. The ADF7022 model is, claims the company, the industry's first transceiver that features an integrated communications processor to support the io-homecontrol protocol. This technology enables home owners to remotely control home systems, such as roller blinds and shutters, awnings, garage doors, roof windows and heating systems. This version is a low-power, high-performance, integrated FSK/GFSK transceiver designed for operation in the three io-homecontrol channels of 868.25, 868.95 and 869.85MHz. It complies to ETSI-300-200 and has enhanced digital baseband features specifically designed for io-homecontrol. The device can perform complex tasks typically carried out by a microprocessor—such as media access, packet management/validation and packet retrieval to and from data-buffer memory—allowing the host microprocessor to remain in power-down mode and thus saving energy. The ADF7023 version is a low-power, low-IF transceiver for operation in the 433MHz, 868MHz and 915MHz bands. It has enhanced baseband features and offers a low transmit-and-receive current, as well as data rates in 2FSK/GFSK up to 250kbit/s. It operates with a power-supply range of 1.8 to 3.6V and features an integrated, low-power 8bit RISC communications processor; a patent-pending, fully-integrated image-rejection scheme; a voltage-controlled oscillator; a fractional-N phase locked loop; a 10bit ADC; and digital received-signal-strength-indication and temperature sensors.
