AD7401 隔离式Σ-Δ调制器

AD7401: 隔离式Σ-Δ调制器

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