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AD5421 Dataheets PDF



Part Number AD5421
Manufacturers Analog Devices
Logo Analog Devices
Description 4mA-to-20mA DAC
Datasheet AD5421 DatasheetAD5421 Datasheet (PDF)

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 digita.

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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 Highway Addressable Remote Transducer (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– 09128-001 REFOUT2 REFOUT1 REFIN Figure 1. CIN REXT1 REXT2 Rev. I 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 othe.


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