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Smart activity tracker integrates ultra-low power MEMS accelerometer Analog Devices, Inc., has introduced the ultra-low power ADXL362 MEMS accelerometer which is integrated into the Pulse activity tracker developed by Withings, a company that creates smart products and apps to help people take care of their health and well-being. The Pulse activity tracker is a pocket-sized tool designed to help users to achieve their personal health and fitness goals. The tracker offers a range of monitoring features, from tracking the number of steps and the distance traveled, to calculating the number of calories burned, measuring heart rate and detecting the quality of sleep. Withings needed technology that offered a high performance solution combined with ultra-low power consumption for a longer battery life and enhanced user autonomy. As the industry’s lowest power MEMS accelerometer, the Analog Devices ADXL362 MEMS accelerometer was a good choice. The 3-axis, ADXL362 MEMS digital accelerometer consumes less than 2 μA at a 100-Hz output data rate and 270 nA when in slower sampling wake-up mode, consuming up to an order of magnitude lower power than competing MEMS accelerometers. The MEMS accelerometer includes an activity detection function that distinguishes between different kinds of motion and prevents the sensor from turning the system on unnecessarily and using additional battery life. Analog Devices www.analog.com RF power LDMOS transistors support the 700 MHz to 2700 MHz band with a single device Freescale Semiconductor has introduced two Airfast RF power devices that cover all major cellular infrastructure bands and deliver industry-leading gain in a compact package. The AFT27S006N delivers 6 W of peak power and is the next-generation follow-on to the popular MW6S004N product. Freescale is also adding a higher power device to this family, called the AFT27S010N, which delivers 10 W of peak power. Both devices feature outstanding frequency range (700 MHz to 2700 MHz) and single-stage gain (20 dB to 24 dB), together with an ultra-small footprint package (PLD- 1.5W) making them ideally suited for macro base station MIMO applications rated up to 40 W average power. Many competitive solutions require customers to deploy multiple RF devices to support this range, but the AFT27S006N and AFT27S010 support this cellular band range with a single power amplifier. The Airfast technology platform allows Freescale to improve performance in frequency, range and gain while addressing a host of other customer needs such as ease-of-use and flexibility. The broad frequency range of these new transistors means they can also be used as universal driver devices for a wide array of additional RF applications. Freescale Semiconductor www.freescale.com 10.1×7.4×3.2mm real-time clock module only draws 130nA typical With typical current consumption of just 130nA, Seiko Epson’s RX6110SA real-time clock (RTC) module enables the reduction of hazardous substances by allowing electronic device makers to replace batteries with supercapacitors. With a 0.33F supercapacitor, the 10.1×7.4×3.2mm chip can operate for 16 weeks. According to the manufacturer, the RX6110SA achieves an operating current that is half that of leading competitors by employing special low-power circuit design techniques and Epson’s unique lowleakage IC process technology. Compared to microcontroller implementations, Epson’s RX6110SA can operate eight times longer. The RX6110SA also includes a diode-less power-supply switching circuit which allows it to operate and charge from power supplies ranging from 5 V down to as low as 1.1V. In addition to keeping time, real-time clocks are used to log powerloss events and save system state when power is lost. Epson’s RX6110SA offers a rich feature set to support these needs, including a 32.768 kHz output, alarms and timers, and RAM. The RX6110SA supports both SPI-bus and I2C-bus interfaces. Epson www.global.epson.com Clock ICs offer sub-200fs of phase jitter for PCIe clock applications Micrel’s PL6020xxx and PL6070xxx clock generators, along with the SY7557xL clock distribution family, provide sub- 200fs phase jitter for the PCI-Express (PCIe) reference clock signals and output-to-output skew of 50ps. Spread Spectrum Technology (SST) in the PL6070xxx is also supported for EMI reduction. The clock synthesizers accept a fundamental crystal or reference input of 25MHz and produce output frequencies ranging from 25MHz to 200MHz with 100MHz phase noise performance of -135 dBc at 10kHz offset. In addition, the PCIe clock synthesizers support 2.5V and 3.3V power supply operation offering design flexibility with reduced power dissipation. The SY75576L and SY75578L clock buffers with 4 and 8 outputs, respectively, provide high performance solutions for new and existing PCIe system designs. The chips offer ultra-low additive phase jitter of sub-150fs with sub-50ps output-to-output skew for stringent PCI Express based server, storage, and networking applications. All devices are production released with Industrial temperature range of 40° C to +85°C .The ICs have Green, RoHS, and PFOS compliant packaging. The devices are offered in 6-pin SOT (1 output), 16-pin 3x3mm QFN (2 outputs), 24-pin 4x4mm QFN (4 outputs), or 44-pin 7x7mm QFN (8 outputs) package options. Micrel www.micrel.com www.electronics-eetimes.com Electronic Engineering Times Europe January 2014 31


EETE JAN 2014
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