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AD5421BREZ

16-bit loop-powered 4-20mA DAC, 0.05% TUE, SPI 30MHz, HART compatible, 28-TSSOP

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Manufacturer Part：

AD5421BREZ

Package：

28-TSSOP w/ Exposed Pad (4.4 x 9.7 mm)

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Description

Product Overview

The AD5421BREZ from Analog Devices is a 16-bit, loop-powered, 4mA to 20mA digital-to-analog converter (DAC) designed for industrial process control and smart transmitter applications. It features 0.05% maximum total unadjusted error, integrated voltage regulator output, on-chip voltage references, HART compatibility, and SPI interface up to 30MHz, in a 28-lead TSSOP package.

Key Specifications

Manufacturer Analog Devices
Resolution 16-bit
Output Range 4-20mA / 3.8-21mA / 3.2-24mA
Total Unadjusted Error 0.05% max (B/C grade)
INL Error 0.0035% FSR max
Loop Voltage Range 5.5V to 52V
Quiescent Current 300uA max
Interface SPI-compatible (30MHz)
Regulated Output 1.8V to 12V
On-Chip References 1.22V and 2.5V
Package 28-TSSOP w/ EP
Operating Temperature -40°C to +105°C

Features

  • 16-bit resolution and monotonicity guaranteed
  • Pin-selectable NAMUR-compliant output ranges
  • Integrated regulated voltage output (1.8V to 12V)
  • On-chip 1.22V and 2.5V reference voltages
  • HART FSK protocol compatible
  • High-speed SPI interface up to 30MHz
  • Slew rate control function
  • On-chip fault alerts via FAULT pin or alarm current
  • Gain and offset adjustment registers
  • Output temperature coefficient: 3ppm/°C typical

Applications

  • Industrial process control 4-20mA loop-powered transmitters
  • Smart transmitters with HART communication
  • Factory automation and instrumentation
  • Building automation systems
  • Field instruments with digital communication

The Analog Devices AD5421BREZ is a complete, loop-powered, 4mA to 20mA digital-to-analog converter designed for smart transmitter manufacturers in the industrial control industry. It provides a high-precision, fully integrated, low-cost solution in a compact 28-lead TSSOP package. The AD5421 includes a regulated voltage output that powers itself and other transmitter devices, providing 1.8V to 12V regulated output. Built-in 1.22V and 2.5V references eliminate the need for discrete regulators and voltage references. The device supports HART FSK protocol communication without performance degradation. The SPI-compatible serial interface operates at up to 30MHz for fast data transfers. With 0.0015% typical INL and 0.0006% typical gain error, the AD5421 delivers exceptional accuracy for demanding process control applications.

The AD5421 operates as a loop-powered DAC with four key subsystems: 1) 16-Bit DAC Core: The R-2R ladder network converts the digital input code into an analog current that drives the loop output through a precision output amplifier. The DAC guarantees 16-bit monotonicity with INL of 0.0035% FSR maximum (B/C grade). 2) Voltage Regulator: An integrated regulator provides 1.8V to 12V output from the loop supply, powering the AD5421 and external circuitry. The regulated output is selectable via REG_SEL pins. 3) Reference System: On-chip 1.22V and 2.5V bandgap references with 4ppm/°C maximum temperature coefficient ensure stable output accuracy. An external reference can also be used for higher precision. 4) Loop Interface: The device connects in series with the 4-20mA current loop, regulating the loop current based on the DAC code. The slew rate control function limits the rate of loop current change, and NAMUR-compliant alarm currents provide fault indication.

Pin Name Type Function
1 REGOUT Output Regulated voltage output (1.8V to 12V)
2 REGIN Power Regulator input from loop supply
3-4 LOOP- Power Loop return connection
5 VLOOP Input Loop voltage monitor input
6 REFOUT1 Output 1.22V reference output
7 REFOUT2 Output 2.5V reference output
8 REFIN Input External reference input
9 CINR Capacitor Internal reference filter capacitor
10 EXT1 Input External NMOS gate drive
11 EXT2 Input External NMOS source connection
12-13 RANGE0/RANGE1 Input Output current range select
14 FAULT Output Fault status output (active low)
15 ALARM_CURRENT_DIR Input Alarm current direction select
16 LDAC Input Load DAC (active low)
17 SYNC Input SPI frame synchronization (active low)
18 SCLK Input SPI serial clock input
19 SDIN Input SPI serial data input
20 SDO Output SPI serial data output
21-23 REG_SEL0-2 Input Regulated output voltage select
24 RSET Input External RSET connection (24kOhm)
25 DVDD Power Digital supply (1.71V to 5.5V)
26 DDIO Power Digital I/O supply
27 COM Ground Common ground
28 REGOUT Output Regulated voltage output (connected to pin 1)
  • 4-20mA loop-powered smart transmitters in industrial process control
  • HART-enabled field instruments with digital communication overlay
  • Factory automation and distributed control system analog output modules
  • Building automation HVAC and environmental monitoring transmitters
  • Petrochemical and oil/gas field instrumentation
Manufacturer Part Number Package Notes
ADI AD5421BCPZ-REEL7 32-LFCSP (5x5mm) Same function, LFCSP package
ADI AD421BRZ 28-TSSOP 16-bit, 4-20mA loop-powered DAC
TI DAC8750IPW 20-TSSOP 16-bit, 4-20mA loop-powered DAC
ADI AD5422BCPZ-REEL7 40-LFCSP 16-bit, voltage/current output DAC
ADI AD5410ACPZ-REEL7 24-LFCSP 12/16-bit, loop-powered DAC
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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