AD7400A:  Isolated Sigma-Delta Modulator

The AD7400A1 is a second-order, 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., ...続きを見る

AD7400A:  Isolated Sigma-Delta Modulator

製品概要

The AD7400A1 is a second-order, 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 AD7400A operates from a 5 V power supply and accepts a differential input signal of ±250 mV (±320 mV full scale). The analog input is sampled continuously 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 and has an operating temperature range of −40°C to +125°C. The AD7400A is offered in an 8-lead surface-mount PDIP with gull wing leads and a 16-lead SOIC package.

Applications

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

    • 1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents are pending..

    Data Sheet, Rev. A, 9/08

    Features

    • 10 MHz clock rate
    • Second-order modulator
    • 16 bits no missing codes
    • ±2 LSB INL typical at 16 bits
    • 1.5 μV/°C typical offset drift
    • On-board digital isolator
    • 8-lead surface-mount PDIP package with gull wing leads and 16-lead SOIC package
    • See Data Sheet for Additional Information

    Diagrams

    AD7400A Diagram
    Functional Block Diagram for AD7400A

    仕様

    Resolution (Bits) 16bit
    T-Put Rate 10MSPS
    # Chan 1
    Supply V Multi(+5, +5 Isolated)
    Pwr Diss (max) 95mW
    Interface Ser
    Ain Range 0.5 V p-p,0.64 V p-p
    SNR (dB) 80dB
    Pkg Type SOIC

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    新製品情報のRSSフィードを取得 続きを見る
    Part# Res Throughput Rate # of Inputs Operating Pwr Diss
    AD7400 16 10MSPS 1 90mW
    AD7400A 16 10MSPS 1 95mW
    AD775 8 20MSPS 1 85mW
    AD7401 16 20MSPS 1 100mW
    AD7720 16 12.5MSPS 1 215mW
    AD9261 16 160MSPS 1 473mW
    AD9261-10 16 160MSPS 1 473mW