AD7705 3V/5V, 1 mW, 2-Channel Differential, 16-Bit Sigma-Delta ADC

The AD7705 and AD7706 are complete 16-bit, low-cost, Sigma Delta ADCs intended for dc and low-frequency ac measurement applications. Their low power (1 mW max @ 3 V) allows them to be used in loop-powered, battery-powered or locally-powered applications. The on-chip Programmable Gain Amplifier with gain settings from I through 128 can accommodate both low-level and high-level analog inputs with no external signal conditioning hardware.

The AD7705 has two differential channels while the AD7706 has one differential and two pseudo-differential channels. Differential reference inputs also allow maximum flexibility in tailoring the device for use in ratiometric applications.

Features and Benefits
  • Two Fully Differential Input Channel ADCs
  • Programmable Gain Front End
    Gains from 1 to 128
  • Three-Wire Serial Interface
    SPI®, QSPI™, MICROWIRE™ and DSP Compatible
    Schmitt Trigger Input on SCLK
  • Ability to Buffer the Analog Input
  • 2.7 V to 3.3 V or 4.75 V to 5.25 V Operation
  • Power Dissipation 1 mW max @ 3 V
  • Standby Current 8 µA max
  • 16-Lead DIP, 16-Lead SOIC and TSSOP Packages
Analog to Digital Converters
Data Sheets
Documentnote
AD7705/AD7706: 3V/5V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADC Data Sheet (Rev. C)PDF 460 kB
Application Notes
Documentnote
AN-282: Fundamentals of Sampled Data SystemsPDF 2131 kB
AN-342: Analog Signal-Handling for High Speed and AccuracyPDF 468 kB
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-280: Mixed Signal Circuit TechnologiesPDF 2101 kB
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-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
AD7705BN Last Time Buy16 ld PDIPOTH 25-40 to 85C00N
AD7705BNZ Production16 ld PDIPOTH 25-40 to 85C5.574.72Y
AD7705BR Last Time Buy16 ld SOIC - WideOTH 47-40 to 85C00N
AD7705BR-REEL Last Time Buy16 ld SOIC - WideREEL 1000-40 to 85C00N
AD7705BRU Last Time Buy16 ld TSSOPOTH 96-40 to 85C00N
AD7705BRU-REEL7 Production16 ld TSSOPREEL 1000-40 to 85C00N
AD7705BRUZ Production16 ld TSSOPOTH 96-40 to 85C4.914.17Y
AD7705BRUZ-REEL Production16 ld TSSOPREEL 2500-40 to 85C04.17Y
AD7705BRUZ-REEL7 Production16 ld TSSOPREEL 1000-40 to 85C04.17Y
AD7705BRZ Production16 ld SOIC - WideOTH 47-40 to 85C4.914.17Y
AD7705BRZ-REEL Production16 ld SOIC - WideREEL 1000-40 to 85C04.17Y
AD7705BRZ-REEL7 Production16 ld SOIC - WideREEL 400-40 to 85C4.914.17Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
EVAL-AD7705EBZEvaluation Board151.8Y
Reference Materials
AD7705/AD7706: 3V/5V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADC Data Sheet (Rev. C) ad7705
AD7705参考代码 ad7705
AN-282: Fundamentals of Sampled Data Systems ad1674
AN-342: Analog Signal-Handling for High Speed and Accuracy ad1674
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B) ad7715
AN-280: Mixed Signal Circuit Technologies ad1674
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-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging ad1674
AN-282: 采样数据系统基本原理[中文版] (Rev. A) ad75019
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-342: 高速、高精度处理模拟信号[中文版] (Rev. 0) ad9540
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
AD7705/AD7706/AD7707 仪表转换器常见问题解答: 校准 ad7705
AD7705/AD7706/AD7707仪表转换器常见问题解答:常规 ad7705
AD7705/AD7706/AD7707仪表转换器常见问题解答: 串行接口 ad7705
AD7705/AD7706/AD7707 Instrumentation Converter FAQs: Architecture ad7705
AD7705/AD7706/AD7707 Instrumentation Converter FAQs: Analog Performance ad7705
MS-2210：高速ADC的电源设计 ad9861
Part 2: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ad7715
Part 1: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ad7715
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