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EDNE MAY 2015

pulse 16-bit isolated ΣΔ modulator for HV monitoring applications Analog Devices has posted details of the AD7402, a high performance, second-order, sigma-delta modulator that converts an analogue input signal into a high speed, single-bit data stream, with on-chip digital isolation based on ADI’s own iCoupler (non-optical) technology. The AD7402 operates from a 5V (VDD1) power supply and accepts a differential input signal of ±250 mV (±320 mV full scale). The differential input is suited to shunt voltage monitoring in high voltage applications where galvanic isolation is required. The input is continuously sampled by a high performance analogue modulator, and converted to a digital output stream with a data rate of 10 MHz. The original information can be reconstructed with an appropriate digital filter to achieve 87 dB signal to noise ratio (SNR) at 39 ksamples/sec. The serial input/ output can use a 5V or a 3.3V supply (VDD2). The serial interface is digitally isolated. High speed CMOS technology, combined with monolithic transformer technology, means the on-chip isolation provides outstanding performance characteristics, superior to alternatives such as optocoupler devices. The AD7402 comes in an 8-lead wide body SOIC package and has an operating temperature range of −40°C to +105°C; it is priced at $3.05 (1000). Distribution deal for ARM mbed IoT Starter Kit, with Freescale silicon A pre-configured ARM mbedenabled microcontroller development board is now available from distributor element14, hosting an ARM Cortex-M4 processor and IBM's BlueMix cloud service. Farnell element14 has announced it is first to stock the recently launched ARM mbed IoT Starter Kit – Ethernet Edition for IBM Internet of Things Foundation. Priced at £79 (UK Pounds or local equivalent) the development kit aims to enable people with limited or no experience of embedded design or web development to create IoT applications and devices, “in a matter of minutes.” The development kit, which guides users through the processes for developing cloud-ready IoT devices, comes with an ARM mbedenabled development board, built on the Freescale FRDM-K64F Kinetis microcontroller, which has an ARM Cortex-M4 processing core running at 120MHz. An Ethernet connection links the kit to IBM's Bluemix cloud service, which acts as a guide on how to use the board. The kits also features a sensor expansion board, which contains a 128 x 32 graphics LCD, 256 kB RAM, 1 MB of flash storage, a speaker, five-way joystick, temperature sensor, accelerometer, potentiometers and a PWM (pulse-width modulation) control line to receive digital signals. Complete article, here Complete article, here 13 EDN Europe | MAY 2015 www.edn-europe.com


EDNE MAY 2015
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