| Analog Devices, Inc. has announced it has extended its portfolio of leading RF ICs with the ADF7021 narrowband transceiver IC. The ADF7021, radio frequency integrated circuit is designed for operation in multiple frequency bands between 80 and 940 MHz. Fully compliant with European ETSI-300-220, North American FCC Part 15 and Part 90,95 and Japan ARIB STD-T67 regulatory standards, the ADF7021 achieves a receiver sensitivity of -123 dBm at 1 kbps and includes on-chip T/R switch, VCO tank and RF/IF filters, fully automatic AFC and ADC. Because of its high radio receiver sensitivity, superior interference blocking, the ADF7021 is ideal for high reliability and maximum range applications. Said Christian Kermarrec, vice president, RF and wireless systems, Analog Devices, Inc: "The new ADF7021 fortifies our portfolio of sub-GHz RF transceivers for high range, low-power, and low-cost wireless connectivity applications. Our commitment to innovation is evident in the ADF7021 as it includes several features that address the core concerns of our customers, namely performance, robustness, and cost and component count reduction." The ADF7021 is the latest addition to ADI's ADF702x family of sub-GHz RF transceiver ICs, which offer low power and minimal external. In addition, to help speed wireless product development, ADI offers its ADIismLINK development tool. Utilizing the ADIismLINK tool, wireless product designers can transfer data between multiple units (slave node) and a master node (another ADF702x device) without having to spend time developing their own protocol software. This results more streamlined electronic design cycle and faster time to market for customers. Had customers undertaken all the electronic design themselves, costs would be much higher. Although it may be thought that applications in this arena would be addressed by Zigbee, having a proprietary solution means that there are no cost overheads resulting from the general approach adopted by standardized chipsets. About the ADF7021
The ADF7021 is a low power, highly integrated 2FSK/3FSK/4FSK radio frequency transceiver. It is designed to operate from 80 MHz to 940MHz. The RF integrated circuit has both Gaussian and raised cosine data filtering options to improve spectral efficiency for narrow-band applications. It is suitable for circuit applications targeted at European ETSI-EN 300-220, the Japanese ARIB STD-T67, the Chinese Short Range Device regulations, and the North American FCC Part 15, Part 90, and Part 95 regulatory standards. The transmit section contains a voltage controlled oscillator (VCO) and a low noise fractional-N PLL with output resolution of <1 ppm. This frequency-agile PLL allows the ADF7021 to be used in frequency hopping spread spectrum (FHSS) systems. The VCO operates at twice the fundamental frequency to reduce spurious emissions and frequency pulling problems. The transmitter output power is programmable in 63 steps from ?16 dBm to +13 dBm and has an automatic power ramp control to prevent spectral splatter and help meet regulatory standards. The transceiver RF frequency, channel spacing, and modulation are programmable using a simple 3-wire interface. The device operates with a power supply range of 2.3 V to 3.6 V and can be powered down when not in use. A low IF architecture is used in the receiver (100 kHz), minimizing power consumption and the external component count while avoiding interference problems at low frequencies. The IF filter has programmable bandwidths of 12.5 kHz, 18.75 kHz, and 25 kHz. The ADF7021 supports a wide variety of programmable features including Rx linearity, sensitivity, and IF bandwidth, allowing the user to trade off receiver sensitivity and selectivity against current consumption, depending on the application. The receiver also features a patent-pending automatic frequency control (AFC) loop with programmable pull-in range, allowing the PLL to track out the frequency error in the incoming signal. An on-chip ADC provides readback of an integrated temperature sensor, an external analog input, the battery voltage, and the RSSI signal, which can provide cost savings. Applications
The new RF integrated circuit is expected to have a large number of applications and it is expected to be incorporated into a large number of electronic designs. Not only can it be used for wireless links around the home from garage door opening to burglar sensors, but it can be sued in a large number of industrial applications. One area where there is a large amount of interest is for remote / wireless reading of electricity meters. The low cost, simplicity and security of the system resulting from its proprietary approach enables these and many more applications to be addressed. |
12:17 [04/12/2006] Post by