EVAL-AD7401EDZ:  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