基于AD5421設(shè)計的回路供電工業(yè)過程控制技術(shù)

1、基于AD5421設(shè)計的回路供電工業(yè)過程控制技術(shù)AD5421是完整的16位4mA-20mA轉(zhuǎn)換器,包括用來給自身和發(fā)送器中其它器件供電的穩(wěn)壓器,輸出電壓從1.8V到12V,漂移為5ppm/.器件還包括精密的1.25V和2.5V基準(zhǔn)電壓源.AD5421采用標(biāo)準(zhǔn)的HARTFSK協(xié)議通信,串口速率高達(dá)20Mbps,主要應(yīng)用在工業(yè)過程控制,4-20mA回路供電發(fā)送器以及智能發(fā)送器.16-Bit,SerialInput,Loop-Powered,4mAto20mADACTheAD5421isacomplete,looppowered,digitalto4mA-to-20mAconverter,design

2、edtomeettheneedsofsmarttransAD5421是完整的16位4mA-20mA轉(zhuǎn)換器,包括用來給自身和發(fā)送器中其它12V,漂移為5ppm/.器件還包括精密的1.25V和2.5V基準(zhǔn)電壓源. AD5421采用標(biāo)準(zhǔn)的HART FSK協(xié)議通信,串口速率高達(dá)20Mbps,主要應(yīng)用在工業(yè)過程控制,4-20mA回路供電發(fā)送器以及智能發(fā)送器.16-Bit, Serial Input, Loop-Powered, 4mA to 20mA DACThe AD5421 is a complete, loop powered, digital to 4mA-to-20mA converter,

3、designed to meet the needs of smart transmitter manufacturers in the Industrial Control industry.It provides a high precision, fully integrated, low cost solution in a compact TSSOP package.The AD5421 includes a regulated voltageout15% integral nonlinearity, 0.03% offset error and 0.03 % gain error.

4、The AD5421 is available in a 28 lead TSSOP package and is specified over the extended industrial temperature range of 40 to +105.AD5421主要特性:16-Bit Resolution and MonotonicityPin selectable NAMUR Compliant Ranges4mA to 20mA3.8mA to 21mA3.2mA to24mANAMUR Compliant ALARM CurrentsDownscale ALARM current

5、 = 3.2mAUpscale ALARM Current = 22.8mA/24mA0.05% maximum Total Unadjusted Error (TUE)0.0015% maximum INL Error (15 Bits minimum)5ppm/ typ Output Drift350uA maximum Quiescent CurrentFlexible SPI Compatible Serial Digital InterfaceSchmitt Triggered InputsOn-Chip Fault Alerts via FAULT pin or ALARM Cur

6、rentLoss of SPI Interface ControlSPI Communication Error (Packet Error Check)Programmed Loop Current out of RangeInsufficient Loop VoltageOver TemperatureAutomatic Readback of Fault Register on each write cycleSlew Rate Control FunctionGain and Offset Adjust RegistersOn-Chip Reference (10 ppm/ Max)Selectable Regulated Voltage OutputLoop Voltage Range5.5V to 52VTemperature Range: -40 to +105TSSOP Packag