Signal Chain Solution for 4-mA to 20-mA HART Enabled Field Instrument Applications

Tue Mar 26, 2013 12:01am EDT

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NORWOOD, Mass.--(Business Wire)--
Analog Devices, Inc. (NASDAQ: ADI) introduced today the CN0267 demonstration
circuit for a loop powered HART (Highway Addressable Remote Transducer) enabled
smart transmitter, for industrial applications that need to operate within a set
3.5-mA power budget. This field instrument circuit demonstrates a complete low
power, high precision signal chain solution with minimum area overhead, which
has been tested and verified by ADI as part of their Circuits from the Lab
reference circuits` initiative. 

• To buy and evaluate this circuit and download the application note and watch
the video:

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technical support community:

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from ADI:

This circuit has been compliance tested, verified and registered as an approved
HART solution by the HART Communication Foundation. This ensures that systems
designed with these ADI devices will adhere to HART protocol requirements and
that DEMO-AD5700D2Z is a proven, tested solution. 

Combining the lowest power components in their class, this solution enables
system engineers to support increased system functionality including the
communications of diagnostics and additional measurement or calibration data.
The 7-cm by 2.3-cm CN0267 PCB demonstrates a direct sensor interface,
microprocessor and two-way HART communication over a 4- 20-mA loop. 

About the CN0267 Circuit Design

CN0267 combines three of ADI`s lowest power, high performance components,
optimized for field instrument designs; 

The ADuCM360, a low power, fully integrated, 3.9-kSPS, 24-bit data acquisition
system-on-a-chip incorporating dual, sigma-delta A/D converters, a 32-bit ARM
CortexTM M3 MCU, and flash/EE memory. Using less than 1-mA of operating current
it delivers more processing-per-mW of power than any other analog
microcontroller within its class. 

The AD5421, is a complete, loop powered, 16-bit, 4-mA to 20-mA DAC that
incorporates a programmable voltage regulator used to power the demonstration
board. The AD5421 consumes less than 300-µA of quiescent current providing a 50
percent power saving and a 55 percent footprint saving over competing offerings.

The AD5700 is a complete HART modem IC, consuming 38 percent less power and
supporting a greater than 75 percent saving in board area over alternative

Pricing, Availability and Complementary Components

 Product                  Sample          Full                 Price Each      
                                          Production           Per 1000        
 DEMO-AD5700D2Z                           NOW                  $90 (per unit)  
 AD5421BREZ               NOW             NOW                  $ 5.55          
 AD5700BCPZ-RL7           NOW             NOW                  $4.45           
 ADUCM360BCPZ128          NOW             NOW                  $8.58           

About Analog Devices

Innovation, performance, and excellence are the cultural pillars on which Analog
Devices has built one of the longest standing, highest growth companies within
the technology sector. Acknowledged industry-wide as the world leader in data
conversion and signal conditioning technology, Analog Devices serves over 60,000
customers, representing virtually all types of electronic equipment. Celebrating
over 40 years as a leading global manufacturer of high-performance integrated
circuits used in analog and digital signal processing applications, Analog
Devices is headquartered in Norwood, Massachusetts, with design and
manufacturing facilities throughout the world. Analog Devices' is included in
the S&P 500 Index.

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Analog Devices, Inc.
Grainne Murphy, 353-61-495540
Porter Novelli
Andrew MacLellan, 617-897-8270

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