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 (max) 2.5mW
    Interface Ser,SPI
    Ain Range (2Vref/PGA Gain) p-p
    SNR (dB) n/a
    Pkg Type SOP

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    Part# Res 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
    AD7798 16 470SPS 3 2mW
    AD7792 16 470SPS 3 2.5mW
    AD7731 24 6.4KSPS 3 67.5mW
    AD7785 20 470SPS 3