AD7403:  16-Bit, Isolated Sigma-Delta Modulator

Product Details

Product Status:Recommended for New Designs

The AD7403 is a high performance, second-order, Σ-Δ modulator that converts an analog input signal into a high speed, single-bit data stream, with on-chip digital isolation based on Analog Devices, Inc., iCoupler® technology. The AD7403 operates from a 5 V (VDD1) power supply and accepts a differential input signal of ±250 mV (±320 mV full-scale). The differential input is ideally suited to shunt voltage monitoring in high voltage applications where galvanic isolation is required.

The analog input is continuously sampled by a high performance analog modulator, and converted to a ones density digital output stream with a data rate of up to 20 MHz. The original information can be reconstructed with an appropriate digital filter to achieve 88 dB signal to noise ratio (SNR) at 78.1 kSPS. The serial input/output can use a 5 V or a 3 V supply (VDD2).

The serial interface is digitally isolated. High speed complementary metal oxide semiconductor (CMOS) technology, combined with monolithic transformer technology, means the on-chip isolation provides outstanding performance characteristics, superior to alternatives such as optocoupler devices. The AD7403 device is offered in a 16-lead, wide-body SOIC package and has an operating temperature range of −40°C to +125°C.


  • Shunt current monitoring
  • AC motor controls
  • Power and solar inverters
  • Wind turbine inverters
  • Data acquisition systems
  • Analog-to-digital and opto-isolator replacements


  • 5 MHz to 20 MHz external clock input rate
  • 16 bits, no missing codes
  • Signal to noise ratio (SNR): 88 dB (typical)
  • Effective number of bits (ENOB): 14.2 bits typical
  • Typical offset drift vs. temperature: 1.6 μV/°C typical
  • On-board digital isolator
  • On-board reference
  • Full-scale analog input range: ±320 mV
  • −40°C to + 125°C operating range
  • High common-mode transient immunity: >25 kV/µs
  • 16-lead SOIC wide body increased creepage package
  • Slew rate limited output for low electromagnetic interference (EMI)
  • VDE VIORM = 1250 VPEAK
  • See data sheet for additional features

Functional Block Diagrams for AD7403


Title Content Type File Type
AD7403: 16-Bit, Isolated Sigma-Delt Modulator Data Sheet (Rev A, 11/2014) (pdf, 364 kB) Data Sheets PDF
Working with Digital Isolators in Motor Control Applications
This webcast will look at the considerations and challenges at key isolation nodes within the motor control signal chain. Choice of an isolation architecture can greatly affect the final system architecture complexity and cost. The isolation required by safety standards for motor drive electronics can be addressed in multiple ways. We will examine some of the tradeoffs involved in designing a system under IEC standards.
Webcasts WEBCAST
UG-683: Evaluating the AD7403 16-Bit, Isolated Sigma-Delta ADC  (pdf, 1847 kB) User Guides PDF
MS-2758: Enhancing Industrial Motor Control Performance Utilizing Digital Isolator Technology  (pdf, 2031 kB) Technical Articles PDF
MS-2652: Measurement Techniques for Industrial Motion Control  (pdf, 1855 kB) Technical Articles PDF
Highest Accuracy Isolated Sigma-Delta Modulator Increases Efficiency of Motor Drives and Power Inverters (22 May 2014) Press Releases HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7403 MATLAB Model
(Wiki Site)
Simulink Models HTML
AD7403 IBIS Models IBIS Models HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products

Recommended DC/DC Converters for the AD7403

  • For isolated Vdd1 (5V), we recommend the ADuM6000.
  • For non-isolated Vdd1 (5V), we recommend the ADP2441.
Recommended Processor for the AD7403
  • For integrated sinc filter implementation, we recommend the ADSP-CM40xF family of ARM Cortex-M4 processors like the ADSP-CM402F.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

Were these recommendations helpful?

SampleSample & Buy

Price, packaging, availability

AD7403 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7403BRIZ Status: Production 16 ld SOIC (increased Creepage) 16 Ind Tube, 37 $3.95 $3.35 Y  Material Info Notify Me Purchase Sample
AD7403BRIZ-RL Status: Production SOIC INCREASED CREEPAGE 16 Ind Reel, 1000 - $3.35 Y  Material Info Notify Me Purchase
AD7403BRIZ-RL13 Status: Obsolete 16 ld SOIC (increased Creepage) 16 Ind Reel - - Y  Material Info Notify Me Contact ADI
AD7403BRIZ-RL7 Status: Production 16 ld SOIC (increased Creepage) 16 Ind Reel, 400 - $3.35 Y  Material Info Notify Me Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD7403 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-AD7403FMCZ Status: Production Evaluation Board $99.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

Check Inventory & Purchase

View Sales and Distribution Offices

content here.
content here.

Review this Product