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AD7401A:  Isolated Sigma-Delta Modulator

Product Details


The AD7401A is a second-order, sigma-delta (Σ-Δ) modulator that converts an analog input signal into a high speed, 1-bit data stream with on-chip digital isolation based on Analog Devices, Inc., iCoupler® technology. The AD7401A operates from a 5 V power supply and accepts a differential input signal of ±250 mV (±320 mV full scale). The analog input is continuously sampled by the analog modulator, eliminating the need for external sample-and-hold circuitry. The input information is contained in the output stream as a density of ones with a data rate up to 20 MHz. The original information can be reconstructed with an appropriate digital filter. The serial I/O can use a 5 V or a 3 V supply (VDD2).

The serial interface is digitally isolated. High speed CMOS, combined with Analog Devices, Inc., iCoupler® technology, means the on-chip isolation provides outstanding performance characteristics, superior to alternatives such as optocoupler devices. The part contains an on-chip reference. The AD7401A is offered in a 16-lead SOIC and has an operating temperature range of −40°C to +125°C.

Applications

  • AC motor controls
  • Shunt current monitoring
  • Data acquisition systems
  • Analog-to-digital and opto-isolator replacements

FEATURES and BENEFITS

  • 20 MHz maximum external clock rate
  • Second-order modulator
  • 16 bits, no missing codes
  • ±2 LSB INL typical at 16 bits
  • 1 µV/°C typical offset drift
  • On-board digital isolator
  • On-board reference
  • Please see data sheet for additional features

Functional Block Diagram for AD7401A

Documentation

Title Content Type File Type
AD7401A: Isolated Sigma-Delta Modulator Data Sheet (Rev C, 07/2011) (pdf, 322 kB) Data Sheets PDF
AN-1265: Isolated Motor Control Feedback Using the ADSP-CM402F/ADSP-CM403F/ADSP-CM407F/ADSP-CM408F SINC Filters and the AD7401A  (pdf, 361 kB) Application Notes PDF
CN0280: Robust Completely Isolated Current Sense Circuit with Isolated Power Supply for Solar Photovoltaic Converters  (pdf, 468 kB) Circuit Note PDF
Solving Isolation Challenges in Power Conversion Applications
This webcast will present solutions to isolation challenges in power conversion applications. Among the topics to be discussed are the limitations of traditional methods of isolation (such as utilization of optocouplers and pulse transformers) vs. more efficient and cost effective solutions that utilize digital isolators. If you are currently using optocouplers and pulse transformers, this is a webcast you should attend.
Webcasts WEBCAST
MS-2652: Measurement Techniques for Industrial Motion Control  (pdf, 1855 kB) Technical Articles PDF
Inside iCoupler® Technology:ADuM347x PWM Controller and Transformer Driver with Quad-Channel Isolators Design Summary  (pdf, 291 kB)
By Flow Zhao, Design Engineer
Technical Articles PDF
NAppkin Note: Lowering the Power of the ADuM524x  (pdf, 223 kB)
By Mark Cantrell, Senior Applications Engineer
Technical Articles PDF
Digital Isolator Product Selection and Resource Guide  (pdf, 640 kB) Product Selection Guide PDF
Analog Devices Achieves Major Milestone by Shipping 1 Billionth Channel of iCoupler Digital Isolation (19 Sep 2013) Press Releases HTML
Using the AD7400A Isolated ΣΔ Modulator as an Isolated Amplifier  (pdf, 150 kB) Overview PDF
2008 Medical Solution Profile  (pdf, 126 kB)
High Performance ICs for Medical Imaging, Patient Monitoring, and Instrumentation
Overview PDF
How do I learn about new iCoupler products? FAQs/RAQs HTML
Are iCoupler products Pb-free? FAQs/RAQs HTML
Can I replace an optocoupler with an iCoupler product in an existing design? FAQs/RAQs HTML
What are some of the distinguishing features of the iCoupler products? FAQs/RAQs HTML
What communications protocols are supported by iCoupler products? FAQs/RAQs HTML
What are the different types of iCoupler products? FAQs/RAQs HTML
Do iCoupler products have VDE certification for reinforced insulation? FAQs/RAQs HTML
With which regulatory standards do iCoupler products comply? FAQs/RAQs HTML
How much isolation can iCoupler products provide? FAQs/RAQs HTML
What are the benefits of iCoupler technology? FAQs/RAQs HTML
What is iCoupler technology? FAQs/RAQs HTML
What types of technologies have been used to provide isolation? FAQs/RAQs HTML
What are optocouplers? What is optical isolation? FAQs/RAQs HTML
What is capacitive isolation? FAQs/RAQs HTML
What regulatory standards address isolation products? FAQs/RAQs HTML
What is isolation? Why is it needed? FAQs/RAQs HTML
What are common applications that use isolation? FAQs/RAQs HTML
How is isolation specified? FAQs/RAQs HTML
What is isolation rating? FAQs/RAQs HTML
What is the relationship between working voltage and isolation rating? FAQs/RAQs HTML
What is the difference between basic and double (or reinforced) insulation levels? FAQs/RAQs HTML
What are transient immunity and common-mode rejection? FAQs/RAQs HTML
What other parameters are important when considering an isolation device? FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7400/AD7401 IBIS Model  (ibs) IBIS Models IBS
CED1Z FPGA Project for AD7401/01A with Nios driver (Wiki Site) Device Drivers 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

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Price, packaging, availability

AD7401A Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7401AYRWZ Status: Production 16 ld SOIC - Wide 16 Ind Tube, 47 $3.72 $3.15 Y  Material Info PCN Purchase Sample
AD7401AYRWZ-RL Status: Production 16 ld SOIC - Wide 16 Ind Reel, 1000 - $3.15 Y  Material Info PCN 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.

AD7401A Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7401AEDZ Status: Production Evaluation Board $59.00 Yes -
EVAL-CED1Z Status: Production Evaluation Board $249.00 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.

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