Datasheet AD74412R (Analog Devices)

Quad-Channel, Software Configurable Input/Output Data Sheet AD74412R FEATURES GENERAL DESCRIPTION Quad-channel software configurable input/output circuit
The AD74412R is a quad-channel software configurable
Screw terminals protected to ±40 V
input/output solution for building and process control
Line protectors to block power from the screw terminals to
applications. The AD74412R contains functionality for analog
supplies
output, analog input, digital input, and resistance temperature
Six configurable modes
detector (RTD) measurements integrated into a single chip
Voltage input
solution with an interface compatible with the serial port
Current input
interface (SPI).
Voltage output
The device features a 16-bit, Σ-∆ analog-to-digital converter
Current output
(ADC) and four configurable, 13-bit digital-to-analog converters
Digital input
(DACs) to provide four configurable input/output channels and a
RTD measurement
suite of diagnostic functions.
Internal 16-bit, Σ-∆ ADC with optional 50 Hz and 60 Hz rejection
There are several modes related to the AD74412R. These modes
13-bit monotonic DACs
are voltage output, current output, voltage input, external y
Charge pump for true zero voltage output
powered current input, loop powered current input, external RTD
Internal temperature sensor, 5°C accuracy
measurement, digital input logic, and loop powered digital input.
On-chip diagnostics including open circuit and short-circuit
The AD74412R contains a high accuracy 2.5 V internal
detection
reference to drive the DACs and the ADC.
Robust architecture COMPANION PRODUCTS SPI Temperature range: −40°C to +85°C External Reference: ADR4525 64-lead LFCSP Power: ADP1720 APPLICATIONS PRODUCT HIGHLIGHTS Building control systems
1. Quad-Channel, Software Configurable Channels.
Process control
2. Built In Diagnostics and Alert Features.
Industrial automation
3. Robust Architecture. Surge tested to ±1 kV, per the IEC61000-4-5 standard, on the input/output terminals with unshielded cables.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION COMPANION PRODUCTS PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS VOLTAGE OUTPUT CURRENT OUTPUT VOLTAGE INPUT CURRENT INPUT EXTERNALLY POWERED CURRENT INPUT LOOP POWERED RTD MEASUREMENT DIGITAL INPUT LOGIC DIGITAL INPUT LOOP POWERED ADC SPECIFICATIONS GENERAL SPECIFICATIONS TIMING CHARACTERISTICS SPI Timing Specifications Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS VOLTAGE OUTPUT CURRENT OUTPUT REFERENCE ADC SUPPLIES THEORY OF OPERATION ROBUST ARCHITECTURE SERIAL INTERFACE DAC ARCHITECTURE ADC OVERVIEW REFERENCE Reference Noise Charge Pump POWER-ON STATE OF THE AD74412R DEVICE FUNCTIONS High Impedance Interpreting ADC Data Voltage Output Mode Voltage Output Short-Circuit Protection Interpretin ADC Data Current Output Mode Current Output Open Circuit Detection Interpreting ADC Data Voltage Input Mode Selectable 200 kΩ to GND Interpreting ADC Data Current Input, Externally Powered Mode Short-Circuit Protection Interpreting ADC Data Current Input, Loop Powered Mode Short-Circuit Protection Interpreting ADC Data Resistance Measurement (External 2-Wire RTD) Interpreting ADC Data Digital Input Logic Interpreting ADC Data Digital Input Current Sink Digital Input Threshold Setting Debounce Function Debounce Mode 0 (Default) Debounce Mode 1 Digital Input Inverter DIGITAL INPUT, LOOP POWERED MODE Interpreting ADC Data GETTING STARTED USING CHANNEL FUNCTIONS Switching Channel Functions ADC FUNCTIONALITY ADC Conversion Rates ADC_RDYB Functionality ADC Output Data Format ADC Noise DIAGNOSTICS DACs LDAC Function Clear Code Function Digital Linear Slew Rate Control DRIVING INDUCTIVE LOADS RESET FUNCTION THERMAL ALERT AND THERMAL RESET FAULTS AND ALERTS Channel Faults POWER SUPPLY MONITORS GPO_x PINS SPI INTERFACE AND DIAGNOSTICS SPI CRC SPI Interface SCLK Count Feature Readback Mode Streaming Mode Auto Readback BOARD DESIGN AND LAYOUT CONSIDERATIONS APPLICATIONS INFORMATION REGISTER MAP NOP REGISTER FUNCTION SETUP REGISTER PER CHANNEL ADC CONFIGURATION REGISTER PER CHANNEL DIGITAL INPUT CONFIGURATION REGISTER PER CHANNEL GPO PARALLEL DATA REGISTER GPO CONFIGURATION REGISTER PER CHANNEL OUTPUT CONFIGURATION REGISTER PER CHANNEL DAC CODE REGISTER PER CHANNEL DAC CLEAR CODE REGISTER PER CHANNEL DAC ACTIVE CODE REGISTER PER CHANNEL DIGITAL INPUT THRESHOLD REGISTER ADC CONVERSION CONTROL REGISTER DIAGNOSTICS SELECT REGISTER DIGITAL OUTPUT LEVEL REGISTER ADC CONVERSION RESULTS REGISTER PER CHANNEL DIAGNOSTIC RESULTS REGISTERS PER DIAGNOSTIC CHANNEL ALERT STATUS REGISTER LIVE STATUS REGISTER ALERT MASK REGISTER READBACK SELECT REGISTER 80 SPS ADC CONVERSION CONTROL REGISTER THERMAL RESET ENABLE REGISTER COMMAND REGISTER SCRATCH OR SPARE REGISTER SILICON REVISION REGISTER OUTLINE DIMENSIONS ORDERING GUIDE