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AD5421BREZ-REEL7 Scheda tecnica(PDF) 1 Page - Analog Devices

Il numero della parte AD5421BREZ-REEL7
Spiegazioni elettronici  16-Bit, Serial Input, Loop-Powered, 4 mA to 20 mA DAC
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD5421BREZ-REEL7 Scheda tecnica(HTML) 1 Page - Analog Devices

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16-Bit, Serial Input,
Loop-Powered, 4 mA to 20 mA DAC
Data Sheet
AD5421
Rev. F
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
©2011–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
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
GENERAL DESCRIPTION
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 opera-
ting 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
RSET
24kΩ
SYNC
SCLK
SDIN
SDO
LDAC
RANGE0
RANGE1
ALARM_CURRENT_DIRECTION
FAULT
RINT/REXT
INPUT
REGISTER
CONTROL
LOGIC
GAIN/OFFSET
ADJUSTMENT
REGISTERS
TEMPERATURE
SENSOR
REFOUT2
REFIN
CIN REXT1 REXT2
REFOUT1
VREF
16
16-BIT
DAC
LOOP
VOLTAGE
MONITOR
VLOOP
DVDD
IODVDD
AD5421
VOLTAGE
REGULATOR
REG_SEL0 REG_SEL1 REG_SEL2 REGOUT REGIN
DRIVE
LOOP–
11.5kΩ
52Ω
COM
Figure 1.


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