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仅使用两个模拟元件的灵活的plc／DC模拟输出模块
一些可编程逻辑控制器（PLC）和分布式控制系统（DCS）应用需要一个功能齐全、灵活、可编程的模拟输出解决方案。图1所示的电路可以完成这一工作。它只有两个模拟元件，满足了PLC和DCS应用的大部分要求。的ad5660-1低功率（2.8兆瓦@ 5 V），轨到轨输出，16位®nanoDAC，结合ad5750-1工业电流/电压输出驱动器，提供了所有典型的电流和电压输出范围为16位分辨率和无失码，0.05%度，小于0.1%的输出误差。该电路还包含工业应用的关键特性，如片上输出故障检测、CRC校验以防止数据包错误（PEC）和灵活的上电选项，这是鲁棒工业控制系统的理想选择。无需外部精密电阻或校准程序，以保持在大批量生产一致的性能，从而使其成为PLC或DCS模块的理想选择。
Figure 1： Basic analog output circuit for single channel （simplified schemaTIc， all connecTIons and protecTIon circuits not shown）。
Circuit descripTIon
The AD5750/AD5750-1 are single-channel， low cost， precision voltage/current output drivers developed to meet the requirements of industrial process control applications. The voltage output range can be programmed for the standard output ranges for PLC and DCS applications： 0 V to 5 V， 0 V to 10 V， −5 V to +5 V， and −10 V to +10 V. A 20 percent overrange setting is also provided for the standard ranges， giving the following options： 0 V to 6 V， 0 V to 12 V， −6 V to +6 V， and −12 V to +12 V.
The current output， which is provided on a separate pin， can be programmed for the ranges of 4 mA to 20 mA， 0 mA to 20 mA， −20 mA to +20 mA， 0 mA to 24 mA， and −24 mA to +24 mA. The unipolar ranges have a two percent overrange setting. Because the AD5750/AD5750-1 current output can either source or sink current， it can interface to a wide variety of sensors or actuators. The voltage and current output pins can be tied together to configure the end system as a single-channel output if desired.
