Overview

Features and Benefits

  • RMSnoise: 
    27 nV at 4.17 Hz (AD7799) 
    65 nV at 16.7 Hz (AD7799) 
    40 nV at 4.17 Hz (AD7798) 
    85 nV at 16.7 Hz (AD7798)
  • Current: 380 μA typical
  • Power-down: 1 μA maximum
  • Low noise, programmable gain, instrumentation amp
  • Internal clock oscillator
  • Simultaneous 50 Hz/60 Hz rejection
  • Reference detect
  • Low-side power switch
  • Programmable digital outputs
  • Burnout currents
  • Power supply: 2.7 V to 5.25 V
  • Update rate: 4.17 Hz to 470 Hz 3 differential inputs

Product Details

The AD7798 / AD7799 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7798 / AD7799 contains a low noise, 16-/24-bit Σ-Δ ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 27 nV for the AD7799 and 40 nV for the AD7798 when the update rate equals 4.17 Hz.

On-chip features include a low-side power switch, reference detect, programmable digital output pins, burnout currents, and an internal clock oscillator. The output data rate from the part is software-programmable and can be varied from 4.17 Hz to 470 Hz.

The part operates with a power supply from 2.7 V to 5.25 V. The AD7798 consumes a current of 300 μA typical, whereas the AD7799 consumes 380 μA typical. Both devices are housed in a 16-lead TSSOP package.

APPLICATIONS

  • Weigh scales
  • Pressure measurement
  • Strain gauge transducers
  • Gas analysis
  • Industrial process control
  • Instrumentation
  • Portable instrumentation
  • Blood analysis
  • Smart transmitters
  • Liquid/gas chromotography 6-digit DVM

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 (20)
  • Data Sheets (1)
  • Application Notes (12)
  • Frequently Asked Questions (1)
  • Circuit Note (4)
  • Rarely Asked Questions (1)
  • Technical Articles (1)
  • Application Notes
    Frequently Asked Questions

    Software & Systems Requirements

    Tools & Simulations

    Design Tools

    Sigma-Delta ADC Tutorial

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

    Reference Designs (5)

    Product Recommendations

    AD7798 Companion Parts

    Recommended Precision Amplifiers

    • For higher supply voltages up to +-8V: AD8639.
    • For more precision and great temperature dirft specs: AD8539.
    • For low noise, low power, low cost: ADA4505-2.
    • For low noise and low power applications: ADA4051-2.

    Recommended 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

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    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.