In loop-powered applications, where one of the key criteria is that “every microamp counts”, it is no wonder that ADI’s recently released AD5700 HART Modem IC has attracted a lot of attention. This product is the industry’s lowest power, complete HART Modem, offering 38% lower power & 75% potential board space savings than competition products.
In this article, I discuss the reasons behind such requirements and the diversity of applications in today’s ever-expanding industrial environment that are employing HART communication technology. As well as reviewing the AD5700/AD5700-1 products, I also introduce the HART enabled smart transmitter reference demo. This demo was developed by ADI and utilizes the AD5421, a 16-bit loop powered, 4 to 20mA DAC, the ADuCM360 microcontroller and the AD5700 HART modem. This circuit has been compliance tested, verified and registered as an approved HART solution by the HART Communication Foundation.