Overview

Features and Benefits

  • 8-/10-Channel, High Resolution Σ-Δ ADCs
  • 16-Bit Resolution
  • Factory-Calibrated
  • Single Conversion Cycle Setting
  • Programmable Gain Front End
  • Simultaneous 50 Hz and 60 Hz Rejection
  • VREF Select Allows Absolute and Ratiometric Measurement Capability
  • Operation Can Be Optimized for Analog Performance (CHOP = 0) or
    Channel Throughput (CHOP= 1)

Product Details

The AD7708 / AD7718 are complete analog front-ends for low frequency measurement applications. The AD7718 contains a 24-bit sigma delta ADC with PGA and can be configured as 4/5 fully-differential input channels or 8/10 pseudo-differential input channels. Two pins on the device are configurable as analog inputs or reference inputs. The AD7708 is a 16-bit version of the AD7718. Inputs signal ranges from 20mV to 2.56V can be directly converted using these ADCs. Signals can be converted directly from a transducer without the need for signal conditioning.

The device operates from a 32 kHz crystal with an on-board PLL generating the required internal operating frequency. The output data rate from the part is software programmable. The peak-to-peak resolution from the part varies with the programmed gain and output data rat

The part operates from a single 3 V or 5 V supply. When operating from 3 V supplies, the power dissipation for the part is 3.84 mW typ. Both parts are pin-for-pin compatible allowing an upgradable path from 16 to 24 bits without the need for hardware modifications. The AD7708 / AD7718 are housed in 28-lead SOIC and TSSOP packages

APPLICATIONS

  • Industrial Process Control
  • Instrumentation
  • Pressure Transducers
  • Portable Instrumentation
  • Smart Transmitters

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Documentation & Resources

  • View All (18)
  • Data Sheets (1)
  • Application Notes (13)
  • Technical Articles (4)
  • Application Notes

    Software & Systems Requirements

    Evaluation Software

    Tools & Simulations

    IBIS Models

    AD7708 IBIS Model

    Design Tools

    Sigma-Delta ADC Tutorial

    An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.

    Product Recommendations

    AD7708 Companion Parts

    Recommended Digital Isolators

    Recommended Voltage References

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

    PCN-PDN Information

    Sample & Buy


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    Evaluation Boards

    Pricing displayed is based on 1-piece.

    Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

    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.