AD7799:  3-Channel, Low Noise, Low Power, 24-Bit, Sigma Delta ADC with On-Chip In-Amp

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 ...More

AD7799:  3-Channel, Low Noise, Low Power, 24-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

    Features

    • 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
    • Low noise, programmable gain, instrumentation amp
    • Update rate: 4.17 Hz to 470 Hz 3 differential inputs
    • 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

    Diagrams

    AD7799 Diagram
    Functional Block Diagram for AD7799

    Specifications

    Resolution (Bits) 24bit
    T-Put Rate 470SPS
    # Chan 3
    Supply V Multi(+3, +5),Multi(+3.3, +5),Single(+2.7 to +5.25) ,Single(+3),Single(+3.3),Single(+5)
    Pwr Diss 2.5mW
    Interface Ser,SPI
    Ain Range (2Vref/PGA Gain) p-p
    SNR (dB) n/a
    Pkg Type SOP

    AD7949 - 14-Bit, 8-Channel, 250 kSPS PulSAR® ADC

    AD7357 - Differential Input, Dual, Simultaneous Sampling, 4.25 MSPS, 14-Bit, SAR ADC

    AD7780 - 24-Bit Pin-Programmable Low Power Σ−Δ ADC

    AD7781 - 20-Bit, Pin-Programmable, Ultralow Power Sigma-Delta ADC

    Subscribe to New Products Feed More
    Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
    AD7793 24 470SPS 3 2.5mW
    AD7799 24 470SPS 3 2.5mW
    AD7794 24 470SPS 6 2.5mW
    AD7785 20 470SPS 3 2.5mW
    AD7798 16 470SPS 3 2mW
    AD7792 16 470SPS 3 2.5mW
    AD7731 24 6.4KSPS 3 67.5mW
    AD7795 16 470SPS 6 2.5mW
    AD7192 24 4.8KSPS 4 27.5mW
    AD7730L 24 600SPS 2 32.5mW
    AD7710 24 1.028KSPS 2 53mW
    Pricing, Packaging & Availability

    Help

    Model
    The model number is a specific version of a generic that can be purchased or sampled.

    Status
    Status indicates the current lifecycle of the product. This can be one of 4 stages:
    • Pre-Release: The model has not been released to general production, but samples may be available.
    • Production: The model is currently being produced, and generally available for purchase and sampling.
    • Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
    • Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).
    Package Description
    The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

    For detailed drawings and chemical composition please consult our  Package Site

    Pin Count
    Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

    Temperature Range
    This is the acceptable operating range of the device. The various ranges specified are as follows:
    • Commercial: 0 to +70 degrees Celsius
    • Military : -55 to +125 degrees Celsius
    • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
    • Automotive: -40 to +125 degrees Celsius
    Price
    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.

    Production Availability
    This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.
    Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

    RoHS Compliant
    Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

    *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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

    View Sales and Distribution Offices