AD7401

PRODUCTION

Isolated Sigma-Delta Modulator

Data Sheet (Rev. F) Product Selection Table
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Overview

  • 20 MHz maximum external clock rate
  • Second-order modulator
  • 16 bits no missing codes
  • ±2 LSB INL typical at 16 bits
  • 3.5 μV/°C maximum offset drift
  • On-board digital isolator
  • On-board reference
  • Low power operation: 20 mA maximum at 5.25 V
  • −40°C to +105°C operating range
  • 16-lead SOIC package
  • Safety and regulatory approvals
  • See Data Sheet for Addtional Features

The AD7401 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 AD7401 operates from a 5 V power supply and accepts a differential input signal of ±200 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 input/output can use a 5 V or a 3 V supply (VDD2).

The serial interface is digitally isolated. High speed CMOS, combined with monolithic air core transformer technology, means the on-chip isolation provides outstanding performance characteristics, superior to alternatives such as optocoupler devices. The device contains an on-chip reference. The AD7401 is offered in a 16-lead SOIC and has an operating temperature range of −40°C to +105°C.

An internal clock version, AD7400, is also available.

APPLICATIONS

  • AC motor controls
  • Data acquisition systems
  • A/D + opto-isolator replacements

AD7401
Isolated Sigma-Delta Modulator
AD7401 Functional Block Diagram AD7401 Pin Configuration
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Documentation

Data Sheet 1

Application Note 7

Technical Articles 8

Evaluation Design File 1

Safety and Regulatory Compliance 1

Frequently Asked Question 1

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Software Resources

Device Drivers 1

Tools & Simulations

IBIS Model 1

Evaluation Kits

EVAL-AD7401

AD7401 Evaluation Board

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Product Details

The EVAL-AD7401EDZ is a fully featured evaluation Kit for the AD7401. This board operates in stand alone mode or in conjunction with the Converter Evaluation and Development board, EVAL-CED1Z . When operated with the Converter Evaluation and Development board, software is provided enabling the user to perform detailed analysis of the ADC's performance. This software includes the technical note describing the operation and set up of the evaluation board in standalone operation or when operated with the Converter Evaluation and Development board.
EVAL-AD7401
AD7401 Evaluation Board

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