AD7176-2 24-Bit, 250 kSPS Sigma Delta ADC with 20 µs Settling

The AD7176-2 is a fast settling, highly accurate, high resolution, multiplexed Σ-Δ analog-to-digital converter (ADC) for low bandwidth input signals. Its inputs can be configured as two fully differential or four pseudo differential inputs via the integrated crosspoint multiplexer. An integrated precision, 2.5 V, low drift (2 ppm/°C), band gap internal reference (with an output reference buffer) adds functionality and reduces the external component count.

The maximum channel scan data rate is 50 kSPS/channel (settling time of 20 µs), resulting in fully settled data with 17 noise free bits. User-selectable output data rates range from 5 SPS to 250 kSPS. The resolution increases at lower speeds.

The AD7176-2 offers three key digital filters. The fast settling sinc5 + sinc1 filter maximizes the channel scan rate. The sinc3 filter maximizes the resolution for single-channel, low speed applications. For 50 Hz and 60 Hz environments, the AD7176-2 specific filter minimizes the settling times or maximizes the rejection of the line frequency. These enhanced filters enable simultaneous 50 Hz and 60 Hz rejection with a 27 SPS output data rate (with a settling time of 36 ms).

System offset and gain errors can be corrected on a per channel basis. This per channel configurability extends to the output data rate used for each channel when using a sinc5 + sinc1 filter. All switching of the crosspoint multiplexer is controlled by the ADC and can be configured to automatically control an external multiplexer via the GPIO pins.

The specified operating temperature range is −40°C to +105°C. The AD7176-2 is housed in a 24-lead TSSOP package.

Applications

Features and Benefits
  • Fast and flexible output rate—5 SPS to 250 kSPS
  • Fast settling time—20 µs
  • Channel scan data rate of 50 kSPS/channel
  • Performance specifications
  • 17 noise free bits at 250 kSPS
  • 20 noise free bits at 2.5 kSPS
  • 22 noise free bits at 5 SPS
  • INL ±2.5 ppm of FSR
  • 85 dB rejection of 50 Hz and 60 Hz with 50 ms settling
  • User-configurable input channels
  • 2 fully differential or 4 pseudo differential
  • Crosspoint multiplexer
  • On-chip 2.5 V reference (drift 2 ppm/°C)
  • Internal oscillator, external crystal, or external clock
  • See data sheet fo additional features
  • Analog to Digital Converters
    IBIS Models
    Design Tools
    Software & Systems Requirements
    Data Sheets
    Documentnote
    AD7176-2: 24-Bit, 250 kSPS Sigma-Delta ADC with 20 μs Settling Data Sheet (Rev. D)
    AD7176-2 Key Sheet
    PDF 972.17 K
    User Guides
    Documentnote
    UG-478: Evaluation Board for the AD7176-2—24-Bit, 250 kSPS Sigma-Delta ADC with 20 μs SettlingPDF 3378 kB
    Technical Books
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD7176-2BRUZ Production24 ld TSSOPOTH 62-40 to 105C9.99.25Y
    AD7176-2BRUZ-RL Production24 ld TSSOPREEL 2500-40 to 105C09.25Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-AD7176-2SDZEvaluation Board50Y
    EVAL-SDP-CB1ZEvaluation Controller Board99Y
    Reference Materials
    AD7176-2: 24-Bit, 250 kSPS Sigma-Delta ADC with 20 μs Settling Data Sheet (Rev. D) ad7176-2
    AD7176-2:24位、250 kSPS Σ-Δ型ADC,建立时间20 μs (Rev. A) ad7176-2
    AD7176-2 Key Sheet ad7176-2
    AD7176-2 IBIS Model ad7176-2
    AD7176-2 Digital Filter Frequency Response Model ad7176-2
    AD717x Eval+ Software ad7176-2
    AD7176-2参考代码 ad7176-2
    AD7176-2 Key Sheet AD7176-2
    UG-478: Evaluation Board for the AD7176-2—24-Bit, 250 kSPS Sigma-Delta ADC with 20 μs Settling ad7176-2
    UG-478: 24位、250 kSPS、20s建立时间、Σ-△型ADCAD7176-2的评估板 ad7176-2
    MT-023: ADC架构IV:Σ-Δ型ADC高级概念和应用 ad7176-2
    MT-022: ADC架构III:Σ-Δ型ADC基础 ad7176-2
    CN0292:用于工业电平信号的完全隔离、鲁棒、4通道、多路复用数据采集系统 adg1204
    CN0310:24位、250 kSPS单电源数据采集系统 ad8475
    轻松支持HART的4 mA至20 mA灵活 带宽电流输入 ad7176-2