Highest Accuracy Isolated Sigma-Delta Modulator Increases Efficiency of Motor Drives and Power Inverters

AD7403 isolated sigma-delta modulator achieves industry’s highest accuracy current and voltage measurement.

India, May 27, 2014: - Analog Devices, Inc. (NASDAQ: ADI) introduced today the industry’s highest accuracy isolated sigma-delta modulator for precision current and voltage measurement in DC/AC power conversion applications. The AD7403 isolated sigma-delta modulator achieves an 81-dB signal-to-noise and distortion ratio (SINAD) (min) @ 78 KSPS over a -40C° to +125C° temperature range, which is 11 dB higher than competing devices. The higher SINAD enables more accurate current and voltage measurement which improves the performance of motor drives by reducing torque ripple on the motor shaft. The higher SINAD also increases the power transfer efficiency in DC/AC power inverter applications, such as motor drives, solar and wind inverters.

Learn more about ADI’s motor and power control solutions: http://motorcontrol.analog.com/en/segment/mc.html

AD7403 Sigma-Delta Modulator Integrates ADI’s iCoupler Digital Isolation Technology

The AD7403 isolated sigma-delta modulator integrates ADI’s iCoupler digital isolation technology, creating a single-chip solution for measuring the voltage across a shunt resistor by converting an analog signal into a 1-bit data stream that can be clocked at up to 20 MHz. The increased isolation working voltage (1250 V peak) allows designers to replace less accurate, more costly Hall Effect sensors in higher DC-bus voltage power conversion and motor drive applications.

The higher performance of the isolated sigma-delta modulator enables the use of a smaller shunt resistor, which reduces thermal loss across the shunt while retaining measurement accuracy.

AD7403 Isolated Sigma-Delta Modulator Key Features

  • 5-MHz to 20-MHz external clock input rate
  • 16 bits, no missing codes
  • Typical offset drift: 1.5 μV/°C
  • On-board digital isolator
  • On-board reference
  • True bipolar analog input range: ±320 mV
  • High common-mode transient immunity: >25 kV/μs

Pricing and Availability


Volume Availability

Price Each per 10,000





16-lead, wide body SOIC

(8.3mm creepage and clearance)

The AD7403 modulator is well suited to work with other ADI products designed for motor control and power conversion systems, including the ADSP-CM40x mixed-signal control processor, ADuM6000 isolated, 5-kV, DC/DC converter and the ADP2441 36-V, 1-A synchronous step-down DC/DC regulator.

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. 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. http://www.analog.com

Review Article Be the first to review this article
SolidCAM: Program your CNCs directly inside your existing CAD system.

Autodesk - DelCAM

Featured Video
Engineering Technician II for City Of Folsom at Folsom, CA
Upcoming Events
3D Collaboration & Interoperability Congress at 1310 Washington Ave. Golden CO - Oct 25 - 26, 2016
Electric&Hybrid Aerospace Technology Symposium 2016 at Conference Centre East. Koelnmesse (East Entrance) Messeplatz 1 Cologne Germany - Nov 9 - 10, 2016
Autodesk University Las Vegas at Las Vegas NV - Nov 15 - 17, 2016
TurboCAD pro : Limited Time offer

Internet Business Systems © 2016 Internet Business Systems, Inc.
595 Millich Dr., Suite 216, Campbell, CA 95008
+1 (408)-337-6870 — Contact Us, or visit our other sites:
AECCafe - Architectural Design and Engineering EDACafe - Electronic Design Automation GISCafe - Geographical Information Services TechJobsCafe - Technical Jobs and Resumes ShareCG - Share Computer Graphic (CG) Animation, 3D Art and 3D Models
  Privacy Policy Advertise