原标题：ADI AD74413R四通道软件可配置输入/输出解决方案

　　ADI公司的AD74413R是用于建筑物和过程控制应用的四通道可软件配置输入/输出解决方案.AD74413R包含了模拟输出,模拟输入,数字输入,电阻温度检测器(RTD)和热电偶测量以及串行外设接口(SPI).器件具有16位Σ-Δ模数转换器(ADC)和四个可配置13位数模转换器(DAC),提供四个可配置输入/输出通路和一套诊断功能.器件的模式包括低矮压输出,电流输出,电压输入,外部供电电流输入,回路供电电流输入,外部RTD测量,数字输入逻辑以及回路供电数字输入.AD74413R还包括高精度2.5V内部基准电压用来驱动DAC和ADC.工作温度−40℃ 至 +105℃,64 引脚 LFCSP封装.主要用在工业控制,过程控制,工厂自动化,马达驱动,建筑物控制系统.本文介绍了AD74413R主要特性,功能框图和详细功能框图,电阻测量配置图,数字输入逻辑模式配置图以及评估板EV-AD74413RSDZ主要特性,电路图,材料清单和PCB设计图.

　　The AD74413R is a quad-channel software configurable input/output solution for building and process control applications. The AD74413R contains functionality for analog output, analog input, digital input, resistance temperature detector (RTD), and thermocouple measurements integrated into a single chip solution with a serial peripheral interface (SPI). The device features a 16-bit, Σ-Δ analog-to-digital converter (ADC) and four configurable, 13-bit digital-to-analog converters (DACs) to provide four configurable input/output channels and a suite of diagnostic functions. There are several modes related to the AD74413R. These modes are voltage output, current output, voltage input, externally powered current input, loop powered current input, external RTD measurement, digital input logic, and loop powered digital input. The AD74413R contains a high accuracy 2.5 V internal reference to drive the DACs and the ADC.

　　AD74413R主要特性:

　　Quad-channel software configurable input/output circuit

　　Screw terminals tolerant to ±40 V dc

　　Line protectors to block power from the screw terminals to supplies

　　User configurable modes

　　Voltage input

　　Current input

　　Voltage output

　　Current output

　　Digital input

　　RTD measurement

　　Internal 16-bit, Σ-Δ ADC with optional 50 Hz and 60 Hz rejection

　　13-bit monotonic DACs

　　Charge pump for true zero voltage output

　　HART-compatible

　　Internal temperature sensor, ±5℃ accuracy

　　On-chip diagnostics including open circuit and short-circuit detection

　　SPI-compatible

　　Temperature range: −40℃ to +105℃

　　64-lead LFCSP

　　AD74413R应用:

　　Process control

　　Factory automation

　　Motor drives

　　Building control systems

　　图1.AD74413R功能框图

　　图2.AD74413R详细功能框图

　　图3.AD74413R电阻测量配置图

　　图4. AD74413R数字输入逻辑模式配置图

　　评估板EV-AD74413RSDZ

　　Evaluating the AD74413R Quad-Channel, Software Configurable Input and Output The EV-AD74413RSDZ (see Figure 5) is a fully featured evaluationboard that can be used to evaluate the features of the AD74413R.

　　The AD74413R is a quad-channel, software configurable, inputand output device. The device has functionality for analog output,analog input, digital input, and resistance temperature detector(RTD) measurements integrated into a single chip solutionwith a serial peripheral interface (SPI).

　　The EV-AD74413RSDZ can be controlled via a systemdemonstration platform (SDP). The SDP-S controls the EVAD74413RSDZvia the USB port of a PC using the AD74413R evaluation software.

　　The EV-AD74413RSDZ requires an AVDD operating supply of14 V to 28.8 V. When the EV-AD74413RSDZ is connected to thePC, the PC powers the SDP-S.

　　See the AD74413R data sheet for more information about theAD74413R, and users must consult the data sheet in conjunctionwith this user guide when using the EV-AD74413RSDZ.

　　评估板EV-AD74413RSDZ主要特性:

　　Fully featured evaluation board for the AD74413R

　　On-board 2.5 V ADR4525 reference

　　SPI-compatible

　　PC-based software for control

　　EVALUATION KIT CONTENTS

　　EV-AD74413RSDZ evaluation board

　　图5.评估板EV-AD74413RSDZ外形图

　　图6.评估板EV-AD74413RSDZ电路图(1)

　　图7.评估板EV-AD74413RSDZ电路图(2)

　　图8.评估板EV-AD74413RSDZ电路图(3)

　　图9.评估板EV-AD74413RSDZ电路图(4)

　　评估板EV-AD74413RSDZ材料清单: