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Analog Devices Semiconductor Electronic Components Datasheet

AD74412R Datasheet

Software Configurable Input/Output

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Data Sheet
FEATURES
Quad-channel software configurable input/output circuit
Screw terminals protected to ±40 V
Line protectors to block power from the screw terminals to
supplies
Six configurable modes
Voltage input
Current input
Voltage output
Current output
Digital input
RTD measurement
Internal 16-bit, Σ-∆ ADC with optional 50 Hz and 60 Hz
rejection
13-bit monotonic DACs
Charge pump for true zero voltage output
Internal temperature sensor, 5°C accuracy
On-chip diagnostics including open circuit and short-circuit
detection
Robust architecture
SPI
Temperature range: −40°C to +85°C
64-lead LFCSP
APPLICATIONS
Building control systems
Process control
Industrial automation
Quad-Channel,
Software Configurable Input/Output
AD74412R
GENERAL DESCRIPTION
The AD74412R is a quad-channel software configurable
input/output solution for building and process control
applications. The AD74412R contains functionality for analog
output, analog input, digital input, and resistance temperature
detector (RTD) measurements integrated into a single chip
solution with an interface compatible with the serial port
interface (SPI).
The device features a 16-bit, Σ-∆ 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 AD74412R. 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 AD74412R contains a high accuracy 2.5 V internal
reference to drive the DACs and the ADC.
COMPANION PRODUCTS
External Reference: ADR4525
Power: ADP1720
PRODUCT HIGHLIGHTS
1. Quad-Channel, Software Configurable Channels.
2. Built In Diagnostics and Alert Features.
3. Robust Architecture. Surge tested to ±1 kV, per the
IEC61000-4-5 standard, on the input/output terminals
with unshielded cables.
Rev. A
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Tel: 781.329.4700
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Analog Devices Semiconductor Electronic Components Datasheet

AD74412R Datasheet

Software Configurable Input/Output

No Preview Available !

AD74412R
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Companion Products ....................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 3
Functional Block Diagram .............................................................. 4
Specifications..................................................................................... 5
Voltage Output.............................................................................. 5
Current Output ............................................................................. 6
Voltage Input ................................................................................. 7
Current Input Externally Powered ............................................. 8
Current Input Loop Powered...................................................... 9
RTD Measurement ....................................................................... 9
Digital Input Logic ..................................................................... 10
Digital Input Loop Powered...................................................... 10
ADC Specifications .................................................................... 11
General Specifications ............................................................... 12
Timing Characteristics .............................................................. 14
Absolute Maximum Ratings.......................................................... 16
Thermal Resistance .................................................................... 16
ESD Caution................................................................................ 16
Pin Configuration and Function Descriptions........................... 17
Typical Performance Characteristics ........................................... 20
Voltage Output............................................................................ 20
Current Output ........................................................................... 22
Reference ..................................................................................... 24
ADC ............................................................................................. 25
Supplies ........................................................................................ 26
Theory of Operation ...................................................................... 27
Robust Architecture ................................................................... 27
Serial Interface ............................................................................ 27
DAC Architecture....................................................................... 27
ADC Overview ........................................................................... 28
Reference ..................................................................................... 28
Power-On State of the AD74412R............................................ 28
Device Functions ........................................................................ 28
Digital Input, Loop Powered Mode ......................................... 38
Getting Started............................................................................ 39
Using Channel Functions .......................................................... 39
ADC Functionality..................................................................... 40
Diagnostics.................................................................................. 44
DACs ............................................................................................ 45
Driving Inductive Loads............................................................ 46
Reset Function ............................................................................ 46
Thermal Alert and Thermal Reset ........................................... 46
Faults and Alerts......................................................................... 46
Power Supply Monitors ............................................................. 46
GPO_x Pins................................................................................. 47
SPI Interface and Diagnostics................................................... 47
Board Design and Layout Considerations .................................. 50
Applications Information .............................................................. 51
Register Map ................................................................................... 52
NOP Register .............................................................................. 53
Function Setup Register per Channel...................................... 53
ADC Configuration Register per Channel ............................. 53
Digital Input Configuration Register per Channel................ 54
GPO Parallel Data Register....................................................... 55
GPO Configuration Register per Channel ............................. 55
Output Configuration Register per Channel.......................... 56
DAC Code Register per Channel ............................................. 56
DAC Clear Code Register per Channel................................... 56
DAC Active Code Register per Channel................................. 57
Digital Input Threshold Register.............................................. 57
ADC Conversion Control Register.......................................... 57
Diagnostics Select Register ....................................................... 58
Digital Output Level Register ................................................... 59
ADC Conversion Results Register per Channel .................... 60
Diagnostic Results Registers per Diagnostic Channel .......... 60
Alert Status Register................................................................... 60
Live Status Register .................................................................... 62
Alert Mask Register.................................................................... 63
Readback Select Register........................................................... 63
80 SPS ADC Conversion Control Register ............................. 64
Thermal Reset Enable Register................................................. 64
Command Register .................................................................... 65
Scratch or Spare Register........................................................... 65
Silicon Revision Register ........................................................... 65
Outline Dimensions ....................................................................... 66
Ordering Guide .......................................................................... 66
Rev. A | Page 2 of 66


Part Number AD74412R
Description Software Configurable Input/Output
Maker Analog Devices
Total Page 30 Pages
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