AD7790 16-Bit, Single-Channel, Ultra Low Power, Sigma Delta A/D Converter

The part can be used in single conversion mode whereby the device powers up, performs a single conversion and then returns to powerdown mode. Alternatively, it can be operated in continuous mode. In continuous conversion mode, the part can be configured to continuously read i.e. the conversions are placed on the serial bus automatically as soon as a conversion is complete (the user does not need to write to the ADC to read the data), assuming that the serial clock is applied to the device. The AD7790/AD7791 is housed in a 10-lead MSOP package.

The AD7790/AD7791 are low-power, complete analog front ends for low frequency measurement applications. The device consumes 65 µA of current typically when operated with a 3 V power supply and 75 µA typical when operated with a 5 V power supply with the buffer disabled. The AD7791 contains a 24-bit S-D ADC with one differential input, which can be buffered or unbuffered. The AD7790 is a 16-bit version of the AD7791. The AD7790 has a peak-to-peak resolution of 16 bits at the default output data rate of 16.6 Hz while the AD7789 has a peak to peak resolution of 19 bits, which is equivalent to an effective resolution of 21.5 bits at this output data rate.

The device operates from an internal clock. Therefore, the user does not have to supply a clock source to the device. The output data rate from the part is software programmable, allowing rates from 9.5 Hz to 120 Hz. The p-p resolution from the part varies with the programmed output data rate. With an output data rate of 16.6 Hz, simultaneous 50 Hz/60 Hz rejection is achieved. Power supply monitoring is also included.

The part can be used in single conversion mode whereby the device powers up, performs a single conversion and then returns to powerdown mode. Alternatively, it can be operated in continuous mode. In continuous conversion mode, the part can be configured to continuously read i.e. the conversions are placed on the serial bus automatically as soon as a conversion is complete (the user does not need to write to the ADC to read the data), assuming that the serial clock is applied to the device.

The AD7790/AD7791 is housed in a 10-lead MSOP package.

Features and Benefits
  • Power
    - Supply: 2.5 V to 5.25 V operation
    - Normal: 75 µA maximum
    - Power-down: 1 µA maximum
  • 16-bit p-p resolution
  • Integral nonlinearity: 3.5 ppm typical
  • Simultaneous 50 Hz and 60 Hz rejection
  • Internal clock oscillator
  • Programmable gain amplifier
  • Rail-to-rail input buffer
  • VDD monitor channel
  • Temperature range: –40°C to +105°C
  • 10-lead MSOP
Analog to Digital Converters
Design Tools
Reference Designs
Data Sheets
Documentnote
AD7790: Low Power, 16-Bit Buffered Sigma-Delta ADC Data Sheet (Rev. A)
AD7790 Key Sheet
PDF 299 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-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-397: Electrically Induced Damage to Standard Linear Integrated Circuits:PDF 149 kB
Frequently Asked Questions
Documentnote
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7790BRM Production10 ld MSOPOTH 50-40 to 105C00N
AD7790BRMZ Production10 ld MSOPOTH 50-40 to 105C3.512.99Y
AD7790BRMZ-REEL Production10 ld MSOPREEL 3000-40 to 105C02.99Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
EVAL-CN0357-ARDZEvaluation Board50Y
Reference Materials
AD7790: 低功耗、16位缓冲式∑-△型ADC (Rev. A) ad7790
AD7790: Low Power, 16-Bit Buffered Sigma-Delta ADC Data Sheet (Rev. A) ad7790
AD7790 Key Sheet ad7790
AD7785/AD7790/AD7791/AD7792/AD7793/AD7794/AD7795/AD7796/AD7797/AD7798/AD7799 Digital Filter Model ad7790
CN0357 Design & Integration Files adr3412
CN0271 设计和集成文件 ad8495
AD7790 Key Sheet AD7790
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-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-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
CN0357:使用电化学传感器的低噪声、单电源有毒气体探测器, 集成可编程增益 TIA ,可用于快速原型制作 ad7790
CN-0271:集成冷结补偿的K型热电偶测量系统 ad8495