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(Datasheet) AD5421

4mA to 20mA DAC

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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
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