Bullet Sensors & Transducers e-Digest, Vol. 132, Issue 9, September 2011: Product News

    (ISSN 1726-5479)

 

 

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Single-Wire 16-bit DAC for 4-to-20 mA Loops Simplifies
Smart Transmitter Design

 

 

Fuerstenfeldbruck/Germany - August 17, 2011 - National Semiconductor Corp. has introduced a 16-bit digital-to-analog converter (DAC) featuring a single-wire interface and 4-to-20 mA current loop drive that simplifies the design of smart transmitters used in industrial two-wire sensor.  The highly integrated DAC161P997 reduces component count and cost in factory and building automation control systems by enabling the use of a single isolation component to cross the isolation boundary. For sensing and detecting applications where galvanic isolation is not required, Nationalís DAC161P997 interfaces directly to a microcontroller.

 

The low-power DAC161P997 provides system designers an exceptional balance of accuracy, ease of use, performance and system cost. Its delta-sigma DAC offers 16-bit accuracy with a minimal temperature coefficient of 29 ppm and long-term output current drift of 90 ppm, while consuming less than 190 ĶA of supply current. The DAC161P997ís loop drive interfaces to a highway addressable remote transducer (HART) modulator, allowing injection of FSK-modulated digital data into the 4-to-20 mA current loop. The DAC operates over the -40 degrees C to 105 degrees C extended industrial temperature range.

 

Key Features and Benefits of the DAC161P997

  • Single-wire interface: enables higher system accuracy compared to discrete PWM implementations, and lower system cost compared to 4-wire SPI solution

  • Low power operation: 190 ĶA enables total system power consumption below 30 mW or 3.5 mA

  • User programmable start up conditions and data rate auto detect: allows system configuration for trade-off between update-rate vs. power consumption

  • Error detection and reporting: multiple error conditions detected automatically, providing higher system reliability

The DAC161P997 complements Nationalís innovative Sensor AFE Family in smart transmitter designs, including a wide variety of gas, temperature and pressure sensor applications.

 

 

About National Semiconductor

 

National Semiconductor is a leader in power management technology.  Known for its easy-to-use analog integrated circuits and world-class supply chain, Nationalís high-performance analog products enable its customersí systems to be more energy efficient. Headquartered in Santa Clara, Calif., National reported sales of $1.52 billion for fiscal 2011. Additional information is available at www.national.com

 

 

Contact:

 

Birgit KŲhler

Public Relations Specialist

National Semiconductor GmbH

Livry-Gargan-Strasse 10, 82256 Fuerstenfeldbruck

Tel: +49 (0)8141-35-1425

E-mail: birgit.koehler@nsc.com

 

DAC161P997

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