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AD5421CREZ-RL7 Datasheet(PDF) 1 Page - Analog Devices |
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AD5421CREZ-RL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 36 page 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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