Supplier eBooks

address these practical considerations. In large-scale deployments, however, the use of battery power and wireless connectivity brings new challenges. Replacing batteries can be cumbersome even in small-scale deployments. Doing so in a network of thousands of devices can be a full-time job, even if those wireless devices are easily accessible after installation. Similar concerns relate to the use of wireless connectivity and the additional challenges it brings for critical lifecycle operations such as device commissioning, firmware updates, and more. For developers, any solution to these scaling challenges must conform to fundamental requirements for minimal cost and maximum performance within the limitations of the available power budget. In tackling these challenges, developers are relying increasingly on highly integrated devices to simplify design and reduce power requirements. Sensor Integration The rapid emergence of sensors based on Microelectromechanical Systems (MEMS) technology illustrates the trend toward greater integration. Fabricated with conventional semiconductor technologies, MEMS devices combine sensors such as accelerometers with their associated support circuits. MEMS-based devices such as Analog Devices' ADXL100x series provide complete sensor subsystems that generate an output voltage proportional to mechanical vibration.. Their combination of reliability and performance range make these sensors equally effective for monitoring movements as subtle as wind-induced motion of buildings or as pronounced as vibration in high-speed motors. In fact, a sensor such as the ADXL1004 lets developers handle both scenarios, leveraging the device's ±500G range for measuring intense vibrations in equipment, but taking advantage of the device's bandwidth and low-noise response to monitor more subtle effects arising from bearings, rotors, or other components buried in the equipment. These sensors typically consume only 1mA in active mode, but for designs with the most stringent power requirements, developers can place these devices in a low-power mode that consumes only 225μA and that relies on the device's ability to transition from standby to active mode in less than 50μs. Low-Power AFEs For other sensor types, integrated Analog Front-End (AFE) devices let developers without extensive analog-design experience apply sophisticated signal-conditioning techniques to sensor measurements. AFEs such as Analog Devices' ADAQ7980, ADAQ7988, and AD7124 combine an Analog-to- Digital Converter (ADC) with a complete signal chain, providing a drop-in solution for a broad range of sensor data-conversion requirements. The ADAQ7980 and ADAQ7988 integrate a high-bandwidth driver, low-noise reference buffer, Low Dropout Regulator (LDO), and a 16-bit Successive Approximation (SAR) ADC needed in typical sensor systems. Analog Devices' four-channel AD7124-4 AFE supports demanding application requirements for precision measurement, combining a multiplexer, Programmable Gain Amplifier (PGA) signal conditioners, 24-bit sigma-delta (e-Δ) ADC, and digital filter. All of these devices are capable of supporting high sampling rates while drawing minimal current. The ADAQ7980 (1,000 Kilo Samples Per Second (kSPS)) and ADAQ7988 (500kSPS) require single-digit current levels, while the AD7124- 4's multiple power modes enable developers to trade sampling rate for current consumption ranging from 2.4kSPS at 255μA to 19.2kSPS at only 930μA. The combination of integrated functionality and design flexibility provided with these devices significantly speeds development. 12 ADF7030-1 Low-Power RF Transceivers LTC333x Nanopower Buck-Boost DC/DC Learn More 4 Learn More 4 • Integrate a high voltage energy harvesting power supply • Each has a DC/DC converter powered by a primary cell battery to create a single output supply • Energy harvesting power supply consists of an integrated full-wave bridge rectifier and a high voltage buck converter • Deliver highly robust RF performance at very low power in a sub-GHz range • Include a low intermediate frequency (IF) receiver that is highly configurable • Support ultra-narrow, narrow, and wide band channel spacing IoT

• Cover