AD7796 Low Power 16-Bit Sigma-Delta A/D Converter for Bridge Sensors

The AD7796/AD7797 are complete, analog front ends for high precision, bridge sensor applications such as weigh scales. The AD7796/AD7797 contain a Σ-∆ ADC capable of 16-/24-bit resolution, respectively. The on-chip instrumentation amplifier has a fixed gain of 128, allowing small amplitude signals such as those from bridge sensors to be directly interfaced to the ADC.

Each device has one differential input and contains a temperature sensor that is internally connected to the ADC. This sensor can be used to perform temperature compensation of the bridge.

The devices can be operated with the internal clock or an external clock. The output data rate from the devices is software-programmable and can be varied from 4.17 Hz to 123 Hz.

The AD7796/AD7797 operate with a power supply from 2.7 V to 5.25 V. Each device consumes a current of 250 µA typical and is housed in a 16-lead TSSOP.

Applications

Features and Benefits
  • RMS noise: 65 nV
  • Instrumentation amp
  • Temperature sensor
  • Internal clock oscillator
  • Simultaneous 50 Hz/60 Hz rejection
  • Update rate range: 4.17 Hz to 123 Hz
  • Current: 250 µA typ
  • Power-down: 1 µA
  • Power supply range: 2.7 V to 5.25 V
  • –40°C to +85°C temperature range
  • Independent interface power supply
  • 16-lead TSSOP
    • Analog to Digital Converters
    Design Tools
    Data Sheets
    Documentnote
    AD7796/AD7797: Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors Low Power, 16-/24-Bit Data Sheet (Rev. B)PDF 471.33 K
    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
    AD7796BRUZ Production16 ld TSSOPOTH 96-40 to 85C3.292.78Y
    AD7796BRUZ-REEL Production16 ld TSSOPREEL 2500-40 to 85C02.78Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-AD7796EBZEvaluation Board59Y
    AD7796/AD7797: Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors Low Power, 16-/24-Bit Data Sheet (Rev. B) ad7796
    AD7785/AD7790/AD7791/AD7792/AD7793/AD7794/AD7795/AD7796/AD7797/AD7798/AD7799 Digital Filter Model ad7790
    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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