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AD5421 - Analog Devices - 4mA to 20mA DAC

Номер произв AD5421
Описание 4mA to 20mA DAC
Производители Analog Devices
логотип Analog Devices логотип 
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AD5421 Даташит, Описание, Даташиты
Data Sheet
16-Bit, Serial Input,
Loop-Powered, 4 mA to 20 mA DAC
AD5421
FEATURES
GENERAL DESCRIPTION
16-bit resolution and monotonicity
Pin selectable NAMUR-compliant ranges
4 mA to 20 mA
3.8 mA to 21 mA
3.2 mA to 24 mA
NAMUR-compliant alarm currents
Downscale alarm current = 3.2 mA
Upscale alarm current = 22.8 mA/24 mA
Total unadjusted error (TUE): 0.05% maximum
INL error: 0.0035% FSR maximum
Output TC: 3 ppm/°C typical
Quiescent current: 300 µA maximum
Flexible SPI-compatible serial digital interface
with Schmitt triggered inputs
On-chip fault alerts via FAULT pin or alarm current
Automatic readback of fault register on each write cycle
Slew rate control function
Gain and offset adjust registers
On-chip reference TC: 4 ppm/°C maximum
Selectable regulated voltage output
Loop voltage range: 5.5 V to 52 V
Temperature range: −40°C to +105°C
TSSOP and LFCSP packages
APPLICATIONS
Industrial process control
4 mA to 20 mA loop-powered transmitters
Smart transmitters
HART network connectivity
The AD5421 is a complete, loop-powered, 4 mA to 20 mA
digital-to-analog converter (DAC) designed to meet the needs
of smart transmitter manufacturers in the industrial control
industry. The DAC provides a high precision, fully integrated,
low cost solution in compact TSSOP and LFCSP packages.
The AD5421 includes a regulated voltage output that is used to
power itself and other devices in the transmitter. This regulator
provides a regulated 1.8 V to 12 V output voltage. The AD5421
also contains 1.22 V and 2.5 V references, thus eliminating the
need for a discrete regulator and voltage reference.
The AD5421 can be used with standard HART® FSK protocol
communication circuitry without any degradation in specified
performance. The high speed serial interface is capable of operating
at 30 MHz and allows for simple connection to commonly used
microprocessors and microcontrollers via a SPI-compatible, 3-wire
interface.
The AD5421 is guaranteed monotonic to 16 bits. It provides
0.0015% integral nonlinearity, 0.0012% offset error, and
0.0006% gain error under typical conditions.
The AD5421 is available in a 28-lead TSSOP and a 32-lead LFCSP
specified over the extended industrial temperature range of
−40°C to +105°C.
COMPANION LOW POWER PRODUCTS
HART Modem: AD5700, AD5700-1
Microcontroller: ADuCM360
FUNCTIONAL BLOCK DIAGRAM
IODVDD DVDD
VLOOP REG_SEL0 REG_SEL1 REG_SEL2 REGOUT REGIN
FAULT
SYNC
SCLK
SDIN
SDO
LDAC
RANGE0
RANGE1
ALARM_CURRENT_DIRECTION
RINT/REXT
INPUT
REGISTER
CONTROL
LOGIC
GAIN/OFFSET
ADJUSTMENT
REGISTERS
LOOP
VOLTAGE
MONITOR
16 16-BIT
DAC
TEMPERATURE
SENSOR
VREF
RSET
24kΩ
VOLTAGE
REGULATOR
DRIVE
11.5kΩ 52Ω
AD5421
COM
LOOP–
REFOUT2 REFOUT1
REFIN
Figure 1.
CIN REXT1 REXT2
Rev. H
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2011–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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AD5421 Даташит, Описание, Даташиты
AD5421* Product Page Quick Links
Last Content Update: 10/05/2016
Comparable Parts
View a parametric search of comparable parts
Evaluation Kits
• AD5421 Evaluation Board
Documentation
Application Notes
• AN-534: Adding HART® Capability to the AD421, Loop-
Powered 4 mA–20 mA DAC Using the 20C15 HART
Modem
Data Sheet
• AD5421: 16-Bit, Serial Input, Loop-Powered, 4 mA to 20
mA DAC Data Sheet
User Guides
• UG-250: Evaluation Board for 16-Bit, Serial Input, Loop-
Powered 4 mA to 20 mA DAC
Software and Systems Requirements
• AD5421 - Microcontroller No-OS Driver
• AD5421 IIO DAC Linux Driver
• AD5421 FMC-SDP Interposer & Evaluation Board / Xilinx
KC705 Reference Design
• BeMicro FPGA Project for AD5421 with Nios driver
Tools and Simulations
• AD5421 IBIS Model
Reference Designs
• CN0267
• CN0278
• CN0382
Reference Materials
Press
• Analog Devices’ Analog Microcontroller with ARM Cortex
M3 and Dual 24-Bit Sigma-delta A/D Converters Offers
Highest Accuracy, Lowest Power
• Signal Chain Solution for 4-mA to 20-mA HART Enabled
Field Instrument Applications
Solutions Bulletins & Brochures
• Digital to Analog Converters ICs Solutions Bulletin
Technical Articles
• Design Trade-Offs for Loop-Powered Transmitters
• MS-2528: Power Consumption: A Primary Consideration in
Smart Transmitter Design
Design Resources
• AD5421 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
View all AD5421 EngineerZone Discussions
Sample and Buy
Visit the product page to see pricing options
Technical Support
Submit a technical question or find your regional support
number
* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet. Note: Dynamic changes to
the content on this page does not constitute a change to the revision number of the product data sheet. This content may be
frequently modified.
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AD5421 Даташит, Описание, Даташиты
AD5421
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Companion Low Power Products .................................................. 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
AC Performance Characteristics ................................................ 9
Timing Characteristics ................................................................ 9
Absolute Maximum Ratings.......................................................... 11
Thermal Resistance .................................................................... 11
ESD Caution................................................................................ 11
Pin Configurations and Function Descriptions ......................... 12
Typical Performance Characteristics ........................................... 14
Terminology .................................................................................... 20
Theory of Operation ...................................................................... 21
Fault Alerts .................................................................................. 21
External Current Setting Resistor ............................................ 22
Loop Current Range Selection.................................................. 22
Connection to Loop Power Supply .......................................... 22
Data Sheet
On-Chip ADC ............................................................................ 23
Voltage Regulator ....................................................................... 23
Loop Current Slew Rate Control.............................................. 23
Power-On Default ...................................................................... 24
HART Communications ........................................................... 24
Serial Interface ................................................................................ 26
Input Shift Register .................................................................... 26
Register Readback ...................................................................... 26
DAC Register .............................................................................. 27
Control Register ......................................................................... 28
Fault Register .............................................................................. 29
Offset Adjust Register ................................................................ 30
Gain Adjust Register .................................................................. 30
Applications Information .............................................................. 32
Determining the Expected Total Error ................................... 32
Thermal and Supply Considerations ....................................... 34
Outline Dimensions ....................................................................... 35
Ordering Guide .......................................................................... 36
Rev. H | Page 2 of 36
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