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 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
Features and Benefits
  • 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
    • Analog to Digital Converters
    Data Sheets
    Documentnote
    AD7798/AD7799: 3-Channel, Low Noise, Low Power, 16-/24-Bit, Sigma Delta ADC with On-Chip In-Amp Data Sheet (Rev. B)PDF 890 kB
    Application Notes
    Documentnote
    AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)PDF 76.97 K
    AN-389: Using Sigma-Delta Converters-Part 2PDF 590 kB
    AN-388: Using Sigma-Delta Converters-Part 1PDF 590 kB
    AN-347: Shielding and GuardingPDF 688 kB
    AN-968: Current Sources: Options and Circuits (Rev. 0)PDF 131 kB
    AN-311: How to Reliably Protect CMOS Circuits Against Power Supply OvervoltagingPDF 217 kB
    AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)PDF 222 kB
    AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)PDF 70 kB
    AN-101: Cross Plot Generator Allows Quick A/D Converter EvaluationPDF 280 kB
    AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:PDF 149 kB
    AN-283: Sigma-Delta ADCs and DACsPDF 1699 kB
    Frequently Asked Questions
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD7799BRU Production16 ld TSSOPOTH 96-40 to 105C5.995.09N
    AD7799BRUZ Production16 ld TSSOPOTH 96-40 to 105C5.184.4Y
    AD7799BRUZ-REEL Production16 ld TSSOPREEL 2500-40 to 105C04.4Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-AD7799EBZEvaluation Board59Y
    AD7798/AD7799: 3-Channel, Low Noise, Low Power, 16-/24-Bit, Sigma Delta ADC with On-Chip In-Amp Data Sheet (Rev. B) ad7798
    AD7799参考代码 ad7799
    AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B) ad7715
    AN-389: Using Sigma-Delta Converters-Part 2 ad7715
    AN-388: Using Sigma-Delta Converters-Part 1 ad7715
    AN-347: Shielding and Guarding ad677
    AN-397: 标准线性集成电路的电诱发损坏 (Rev. 0) ad7715
    AN-101: 交会图发生器加快模数转换器评估 (Rev. 0) ad677
    AN-615: 峰峰值分辨率与有效分辨率 (Rev. 0) ad7715
    AN-607: 选择低带宽(<15kSPS)Σ-Δ型ADC (Rev. E) ad7701
    AN-202: IC放大器用户指南：去耦、接地及其他一些要点 (Rev. 0) ad8021
    AN-968: 电流源：方案与电路 (Rev. 0) ad7783
    AN-968: Current Sources: Options and Circuits (Rev. 0) ad7783
    AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging ad1674
    AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E) ad7701
    AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0) ad7715
    AN-101: Cross Plot Generator Allows Quick A/D Converter Evaluation ad677
    AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits: ad7715
    AN-311: 如何切实有效地保护CMOS电路不受电源过压影响 (Rev. 0) adg406
    AN-389: 使用Σ-Δ转换器—第二部分[中文版] (Rev. 0) ad7715
    AN-388: 使用Σ-Δ转换器—第一部分[中文版] (Rev. 0) ad7715
    AN-283: Σ-Δ型ADC和DAC[中文版] (Rev. 0) ad74111
    AN-283: Sigma-Delta ADCs and DACs ad7715
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