AD7782 2-Channel, Read-Only, Pin-Configured, 24-bit Sigma-Delta ADC

The AD7782 and AD7783 are 24-bit low cost, low power Sigma Delta ADCs intended for dc and low frequency ac measurement applications. They are Read-only ADCs and have no writeable registers. This leads to a very simple interface between ADC and controller. Since their power consumption is low, the devices can be loop powered, battery powered or locally powered. The two-setting on-chip PGA can accommodate either a low-level or high-level analog input with no external signal conditioning hardware. Operating options are pin-programmable, not software programmable.

Features and Benefits
  • 2-Channel, 24-Bit Σ-Δ ADC
    Pin Configurable (No Programmable Registers) 
    Pin Selectable Input Channels 
    Pin Programmable Input Ranges (±2.56 V or ±160 mV)
  • Fixed 19.79 Hz Update Rate
  • Simultaneous 50 Hz and 60 Hz Rejection
  • 24-Bit No Missing Codes
  • 18.5-Bit p-p Resolution (±2.56 V Range)
  • On-Chip Functions Rail-Rail Input Buffer and PGA
  • 16.5-Bit p-p Resolution (±160 mV Range)
  • Interface
    Master or Slave Mode of Operation 
    Slave Mode: 
    3-Wire Serial 
    SPI®, QSPI™, MICROWIRE™, and DSP-Compatible 
    Schmitt Trigger on SCLK
  • Power
    Specified for Single 3 V and 5 V Operation 
    Normal: 1.3 mA @ 3 V 
    Power-Down: 9 µA
Analog to Digital Converters
Data Sheets
Documentnote
AD7782: Read Only, Pin Configured 24-Bit Sigma-Delta ADC Datasheet (Rev. A)PDF 126 kB
Application Notes
Documentnote
AN-610: The PGA on Sigma-Delta ADCs (Rev. A)PDF 152 kB
AN-609: Chopping on Sigma-Delta ADCs (Rev. 0)PDF 232 kB
AN-608: Input Buffers on Sigma-Delta ADCs (Rev. 0)PDF 284 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-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-614: Using the AD7782 in Low Power Applications (Rev. 0)PDF 93 kB
AN-611: 50 Hz/60Hz Rejection on Sigma-Delta ADCs (Rev. 0)PDF 360 kB
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:PDF 149 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7782BRUZ Production16 ld TSSOPOTH 96-40 to 85C5.064.3Y
AD7782BRUZ-REEL Production16 ld TSSOPREEL 2500-40 to 85C04.3Y
AD7782BRUZ-REEL7 Production16 ld TSSOPREEL 1000-40 to 85C04.3Y
Reference Materials
AD7782: Read Only, Pin Configured 24-Bit Sigma-Delta ADC Datasheet (Rev. A) ad7782
AN-610: The PGA on Sigma-Delta ADCs (Rev. A) ad7783
AN-609: Chopping on Sigma-Delta ADCs (Rev. 0) ad7783
AN-608: Input Buffers on Sigma-Delta ADCs (Rev. 0) ad7783
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B) ad7715
AN-397: 标准线性集成电路的电诱发损坏 (Rev. 0) ad7715
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-609: Σ-Δ ADC上的斩波 (Rev. 0) ad7783
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-614: 在低功耗应用中使用AD7782 (Rev. 0) ad7782
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-614: Using the AD7782 in Low Power Applications (Rev. 0) ad7782
AN-611: Σ-Δ ADC上的50 Hz/60 Hz干扰抑制 (Rev. 0) ad7783
AN-611: 50 Hz/60Hz Rejection on Sigma-Delta ADCs (Rev. 0) ad7783
AN-610: Σ-Δ型ADC上的PGA (Rev. A) ad7783
AN-608: Σ-Δ ADC上的输入缓冲器 (Rev. 0) ad7783
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
MS-2210：高速ADC的电源设计 ad9861
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