AD7792 3-Channel, Low Noise, Low Power, 16-Bit Sigma Delta ADC with On-Chip In-Amp and Reference

The AD7792/AD7793 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7792/AD7793 contain 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 40 nV when the update rate equals 4.17 Hz.

The devices contain a precision low noise, low drift internal band gap reference and can accept an external differential reference. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator. The bias voltage generator sets the common-mode voltage of a channel to AVDD/2.

The devices can be operated with either the internal clock or an external clock. The output data rate from the parts is software-programmable and can be varied from 4.17 Hz to 470 Hz.

The parts operate with a power supply from 2.7 V to 5.25 V. They consume a current of 400 μA typical and are housed in a 16-lead TSSOP package.

Applications
  • Thermocouple measurements
  • RTD measurements
  • Thermistor measurements
  • Gas analysis
  • Industrial process control
  • Instrumentation
  • Portable instrumentation
  • Blood analysis
  • Smart transmitters
  • Liquid/gas chromatography
  • 6-digit DVM
Features and Benefits
  • Up to 23 bits effective resolution
  • RMS noise
  • 40 nV @ 4.17 Hz
  • 85 nV @ 16.7 Hz
  • Current: 400 μA typical
  • Power-down: 1 μA maximum
  • Low noise programmable gain instrumentation amp
  • Band gap reference with 4 ppm/°C drift typical
  • Update rate: 4.17 Hz to 470 Hz
  • 3 differential inputs
  • Internal clock oscillator
  • Simultaneous 50 Hz/60 Hz rejection
    • Analog to Digital Converters
    Design Tools
    Data Sheets
    Documentnote
    AD7792/AD7793: 3-Channel, Low Noise, Low Power, 16-/24-Bit Sigma Delta ADC with On-Chip In-Amp and Reference Data Sheet (Rev. B)
    AD7792/AD7793 Key Sheet    		PDF 654 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-880: ADC Requirements for Temperature Measurement Systems (Rev. 0)PDF 423 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
    AD7792BRU Production16 ld TSSOPOTH 96-40 to 105C5.484.66N
    AD7792BRUZ Production16 ld TSSOPOTH 96-40 to 105C4.754.04Y
    AD7792BRUZ-REEL Production16 ld TSSOPREEL 2500-40 to 105C04.04Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-AD7792EBZEvaluation Board59Y
    AD7792/AD7793：3通道、低噪声、低功耗、16/24位Σ-ΔADC内置片内仪表放大器和基准电压源 数据手册 (Rev. B) ad7792
    AD7792/AD7793: 3-Channel, Low Noise, Low Power, 16-/24-Bit Sigma Delta ADC with On-Chip In-Amp and Reference Data Sheet (Rev. B) ad7792
    AD7792/AD7793 Key Sheet ad7792
    AD7785/AD7790/AD7791/AD7792/AD7793/AD7794/AD7795/AD7796/AD7797/AD7798/AD7799 Digital Filter Model ad7790
    AD7792参考代码 ad7792
    AD7792/AD7793 Key Sheet AD7793
    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-880: ADC Requirements for Temperature Measurement Systems (Rev. 0) ad7792
    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-880: 温度测量系统对ADC的要求 (Rev. 0) ad7792
    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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