AD7400

PRODUCTION

Isolated Sigma-Delta Modulator

Data Sheet (Rev. I) Product Selection Table
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Overview

  • 10 MHz 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: 18 mA maximum at 5.25 V
  • −40°C to +105°C operating range
  • 16-lead SOIC package
  • Safety and regulatory approvals
    • UL 1577
      • VISO = 5000 V rms for 1 minute
    • IEC / CSA 62368-1
    • IEC / CSA 61010-1
    • DIN EN IEC 60747-17 (VDE 0884-17)
      • VIORM = 645 V peak

The AD7400 is a second-order, sigma-delta (Σ-Δ) modulator that converts an analog input signal to a high speed, 1-bit data stream with on-chip digital isolation based on Analog Devices, Inc. iCoupler® technology. The AD7400 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 of 10 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 monolithic air core transformer 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 AD7400 is offered in a 16-lead SOIC and has an operating temperature range of −40°C to +105°C.

An external clock version, AD7401, is also available.

Applications

  • AC motor controls
  • Data acquisition systems
  • A/D + opto-isolator replacements
AD7400
Isolated Sigma-Delta Modulator
AD7400 Functional Block Diagram AD7400 Pin Configuration
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Documentation

Data Sheet 1

Application Note 8

Technical Articles 4

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-AD7400

AD7400 Evaluation Board

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Product Details

The EVAL-AD7400EDZ is a fully featured evaluation Kit for the AD7400. 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-AD7400
AD7400 Evaluation Board

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