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AD7798:  3-Channel, Low Noise, Low Power, 16-Bit, Sigma Delta ADC with On-Chip In-Amp

Product Status:   Production 

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 ...More

AD7798:  3-Channel, Low Noise, Low Power, 16-Bit, Sigma Delta ADC with On-Chip In-Amp

Product Description

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

    • Data Sheet, Rev. A, 3/07

      • RMS noise:
        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
      • Update rate: 4.17 Hz to 470 Hz 3 differential inputs
      • 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

    Functional Block Diagram for AD7798

    OF NOTE ...

    AD779x Product Family FAQs

    For additional ADI Healthcare Products and related information, please visit www.analog.com/healthcare.

    Suggested Companion Products


    Recommended References for the AD7798

    • In a non-ratiometric application, we recommend the ADR381 or the ADR391 low noise, low power 2.5V reference.
    • For lowest noise and higher accuracy, we recommend the ADR421 or the ADR431.
    Recommended Precision Amplifiers for the AD7798
    • For low noise and low power applications, we recommend the ADA4051-2.
    • For more precision and great temperature dirft specs, we recommend AD8539.
    • For higher supply voltages up to +-8V, we recommend AD8639.
    Recommended Power Solutions
    • For selecting voltage regulator products, use ADIsimPower.

    Were these recommendations helpful?

    Budgetary Price & Packaging   |   Samples   |   Check Inventory & Purchase

    AD7798 Model Options
    Model Package Pins Temp.
    Range    		 Packing,
    Qty    		 Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD7798BRUZ Status: Production 16 ld TSSOP 16 Ind Tube, 96 $4.52 $3.85 Y  Material Info PCN Purchase Sample
    AD7798BRUZ-REEL Status: Production 16 ld TSSOP 16 Ind Reel, 2500 - $3.85 Y  Material Info PCN Purchase
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    • Automotive: -40 to +125 degrees Celsius
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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

    AD7798 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EVAL-AD7798EBZ Status: Production Evaluation Board $59.00 Yes -

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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.

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