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ADI 公司的AD5421是完整的16位4mA-20mA转换器,包罗用来给自身和发送器中其它器件供电的稳压器,输出电压从1.8V到12V,漂移为5ppm/℃.器件还包罗细密的1.25V和2.5V基准电压源. AD5421接纳尺度的HART FSK协议通信,串口速率高达20Mbps,主要应用在工业过程控制,4-20mA回路供电发送器以及智能发送器.本文先容了AD5421主要特点, 功能方框架图,和HART调制解调器毗连框架图以及应用框架图. 16-Bit, Serial Input, Loop-Powered, 4mA to 20mA DAC The AD5421 is a complete, loop powered, digital to 4mA-to-20mA converter, 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 voltage output that is used to power itself and other devices in the transmitter. This regulator provides a regulated 1.8V to 12V output voltage. The device also contains precision 1.25V and 2.5V references, The AD5421 thus eliminates 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 20 Mbps and allows for simple connection to commonly-used microprocessors and microcontrollers via a SPI compatible three-wire interface. The AD5421 is guaranteed monotonic to 16-bits, offers 0.0015% integral nonlinearity, 0.03% offset error and 0.03 % gain error. The AD5421 is available in a 28 lead TSSOP package and is specified over the extended industrial temperature range of C40℃ to +105℃. AD5421主要特点: 16-Bit Resolution and Monotonicity Pin selectable NAMUR Compliant Ranges 4mA to 20mA 3.8mA to 21mA 3.2mA to 24mA NAMUR Compliant ALARM Currents Downscale ALARM current = 3.2mA Upscale ALARM Current = 22.8mA/24mA 0.05% maximum Total Unadjusted Error (TUE) 0.0015% maximum INL Error (15 Bits minimum) 5ppm/℃ typ Output Drift 350uA maximum Quiescent Current Flexible SPI Compatible Serial Digital Interface Schmitt Triggered Inputs On-Chip Fault Alerts via FAULT pin or ALARM Current Loss of SPI Interface Control SPI Communication Error (Packet Error Check) Programmed Loop Current out of Range Insufficient Loop Voltage Over Temperature Automatic Readback of Fault Register on each write cycle Slew Rate Control Function Gain and Offset Adjust Registers On-Chip Reference (10 ppm/℃ Max) Selectable Regulated Voltage Output Loop Voltage Range 5.5V to 52V Temperature Range: -40℃ to +105℃ TSSOP Package HART Compatible AD5421应用: Industrial Process Control 4-20mA Loop Powered Transmitter Smart Transmitter 详情请复制打开此衔接地址: |
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