AD7401:  隔离式Σ-Δ调制器

AD7401 功能框图The AD7401* is a second-order, sigma-delta (Σ-Δ) modulator that converts an analog input signal into a high speed, 1-bit data stream with on-chip digital isolation based on Analog Devices, Inc. iCoupler® technology. The AD7401 operates from a 5 V power supply and accepts a differential input signal of ±200 mV (±320 mV full scale). The analog input is continuously sampled by the analog modulator, eliminating the need for external sample-and-hold circuitry. The input information is contained in the output stream as a density of ones with a data rate up to 20 MHz. The original information can be reconstructed with an appropriate digital filter. The serial I/O can use a 5 V or a 3 V supply (VDD2).The serial interface is digitally isolated. High speed CMOS, combined with monolithic air core transformer technology, means the on-chip isolation provides outstanding performance characteristics, superior to alternatives such as optocoupler devices. The part contains an on-chip reference.An internal clock version, AD7400, is also available.

AD7401*是一款二阶Σ-Δ调制器,采用ADI公司iCoupler®技术的片内数字隔离,能将模拟输入信号转换为高速的1比特的数据流。AD7401采用5V电源供电,可输入±200 mV的差分信号(满量程±320 mV)。模拟调制器对模拟输入信号连续采样,因而无需外部采样保持电路。输入信息包含在数据率最高为20 MHz的输出流中,通过适当的数字滤波器可重构原始信息。串行I/O可采用5 V或3 V电源供电(VDD2)。串行接口采用数字式隔离。通过将高速CMOS工艺和单片空芯变压器技术结合在一起,较之传统光耦合器等其它元件来说,片内隔离能提供更加优异的工作特性。该器件内置片内基准电压。我们还提供采用内部时钟的产品--AD7400

特点
  • 20 MHz 最大外部时钟速率
  • 二阶调制器
  • 16位无失码
  • 16位时INL典型值为±2 LSB
  • 最大失调漂移为3.5 μV/°C
  • 片内数字隔离器
  • 片内基准电压
  • 低功耗工作:5.25 V时最大电流为20 mA
技术指标
  • Resolution (Bits): 16bit
  • # Chan: 1
  • Sample Rate: 20MSPS
  • Interface: Ser
  • Analog Input Type: Diff-Uni
  • Ain Range: 0.4 V p-p
  • ADC Architecture: Sigma-Delta Modulator
  • Pkg Type: SOIC
应用领域
  • 交流电机控制
  • 数据采集系统
  • 可替代ADC加光隔离器的方案
订购指南
产品型号 产品状态 封装 引脚 温度范围
AD7401YRWZ 量产 16 ld SOIC - Wide 16 工业
AD7401YRWZ-REEL 量产 16 ld SOIC - Wide 16 工业
AD7401YRWZ-REEL7 量产 16 ld SOIC - Wide 16 工业
EVAL-AD7401EDZ 量产 评估板 - 待定
AD7401 应用技术支持与电子电路设计开发资源下载
  1. AD7401 数据手册DataSheet下载 .pdf
  2. Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .pdf
  3. ADC模数转换器选型指南 .pdf