Single-Channel, 16-Bit Current/Voltage Output DAC with HART Connectivity Data Sheet AD5423 FEATURES GENERAL DESCRIPTION 16-bit resolution and monotonicity The AD5423 is a single-channel, voltage and current output digital- Current or voltage output available on a single terminal to-analog converter (DAC) that operates with a power supply range Current output ranges: 0 mA to 20 mA, 4 mA to 20 mA, from 33 V minimum on AVSS to +33 V maximum on AVDD1. The 0 mA to 24 mA, 20 mA, 24 mA, and 1 mA to +22 mA CHART pin enables a Highway Addressable Remote Transducer Voltage output ranges (with 20% overrange): 0 V to 5 V, (HART) signal to be coupled on the current output. 0 V to 10 V, 5 V, and 10 V The AD5423 uses a versatile, 4-wire, serial peripheral interface User programmable offset and gain (SPI) that operates at clock rates of up to 50 MHz and is Advanced on-chip diagnostics, including a 12-bit ADC compatible with standard SPI, QSPI, MICROWIRE, digital On-chip reference signal processor (DSP), and microcontroller interface standards. 40C to +115C temperature range The interface also features an optional SPI cyclic redundancy 32-Lead, 5 mm 5 mm LFCSP package check (CRC) and a watchdog timer (WDT). The AD5423 offers improved diagnostic features from earlier versions of similar APPLICATIONS DACs, such as an integrated, 12-bit diagnostic analog-to-digital Process control converter (ADC). Actuator control Channel isolated analog outputs PRODUCT HIGHLIGHTS Programmable logic controller (PLC) and distributed control 1. 16-bit performance. systems (DCS) applications 2. Range of diagnostic features. HART network connectivity 3. Integrated 12-bit monitoring ADC. 4. HART compliant. COMPANION PRODUCTS Product Family: AD5758, AD5753, AD5755-1, AD5422 HART Modem: AD5700, AD5700-1 External References: ADR431, ADR3425, ADR4525 Digital Isolators: ADuM141D, ADuM142D Power: ADP1031, ADP2360, ADM6339 Rev. A 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2019-2020 Analog Devices, Inc. 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AD5423 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Voltage Output ............................................................................ 30 Applications ....................................................................................... 1 Current Output ........................................................................... 30 General Description ......................................................................... 1 HART Connectivity ................................................................... 30 Product Highlights ........................................................................... 1 Digital Slew Rate Control .......................................................... 31 Companion Products ....................................................................... 1 AD5423 Address Pins ................................................................ 31 Revision History ............................................................................... 2 SPI Interface and Diagnostics ................................................... 31 Functional Block Diagram .............................................................. 3 WDT ............................................................................................ 33 Specifications ..................................................................................... 4 User Digital Offset and Gain Control...................................... 33 AC Performance Characteristics ................................................ 9 DAC Output Update and Data Integrity Diagnostics ........... 34 Timing Characteristics .............................................................. 10 Use of Key Codes ........................................................................ 34 Absolute Maximum Ratings .......................................................... 13 Software Reset ............................................................................. 34 Thermal Resistance .................................................................... 13 Calibration Memory CRC ......................................................... 35 ESD Caution ................................................................................ 13 Internal Oscillator Diagnostics ................................................. 35 Pin Configuration and Function Descriptions ........................... 14 Sticky Diagnostic Results Bits ................................................... 35 Typical Performance Characteristics ........................................... 16 Background Supply and Temperature Monitoring ................ 35 Voltage Output ............................................................................ 16 Output Fault ................................................................................ 36 Current Output ........................................................................... 20 ADC Monitoring ........................................................................ 36 Reference ..................................................................................... 24 Register Map ................................................................................... 39 General ......................................................................................... 25 Writing to Registers ................................................................... 39 Terminology .................................................................................... 26 Reading from Registers ............................................................. 39 Theory of Operation ...................................................................... 28 Autostatus Readback Mode ...................................................... 41 DAC Architecture ....................................................................... 28 Programming Sequence to Enable the Output ...................... 43 Serial Interface ............................................................................ 28 Register Details ........................................................................... 45 Power-On State of the AD5423 ................................................ 29 Outline Dimensions ....................................................................... 59 Power Supply Considerations ................................................... 29 Ordering Guide .......................................................................... 59 Device Features and Diagnostics .................................................. 30 REVISION HISTORY 1/2020Rev. 0 to Rev. A Change to Figure 1 ........................................................................... 1 Change to Absolute Maximum Ratings Section ......................... 13 Replaced Figure 11 ......................................................................... 16 Replaced Figure 36 and Figure 38 ................................................ 21 Changes to Figure 39 ...................................................................... 21 7/2019Revision 0: Initial Version Rev. A Page 2 of 59