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1、ADI AD5421 回路供电工业过程控制方案ADI 公司的 AD5421 是完整的 16 位 4mA-20mA 转换器,包括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/. 器件还包括精密的 1.25V 和2.5V 基准电压源 . AD5421 采用标准的 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.本文介绍了 AD5421 主要特性, 功能方框图,和 HART 调制解调器连接框图以及应用框图.16-Bit, Serial Input, Loop-Powered,
2、 4mA to 20mA DACThe 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
3、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 referen
4、ce.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 comp
5、atible 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 40 to +105.AD5421 主要特性 :16-B
6、it Resolution and MonotonicityPin selectable NAMUR Compliant Ranges4mA to 20mA3.8mA to 21mA3.2mA to 24mANAMUR Compliant ALARM CurrentsDownscale ALARM current = 3.2mAUpscale ALARM Current = 22.8mA/24mA0.05% maximum Total Unadjusted Error (TUE)0.0015% maximum INL Error (15 Bits minimum)5ppm/ typ Outpu
7、t Drift350uA maximum Quiescent CurrentFlexible SPI Compatible Serial Digital InterfaceSchmitt Triggered InputsOn-Chip Fault Alerts via FAULT pin or ALARM CurrentLoss of SPI Interface ControlSPI Communication Error (Packet Error Check)Programmed Loop Current out of RangeInsufficient Loop VoltageOver
8、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 PackageHART CompatibleAD5421 应用 :Industrial Process Control4-20mA Loop Powered TransmitterSmart TransmitterAO-Electronics 傲壹电子 官网： 中文网：ALPS ADI IR JRC/NJR KEC OTAX Seoul Semiconductor TI Walsin Technology图 1.AD5421 功能方框图图 2.AD5421 和 HART 调制解调器连接框图图 3.AD5421 应用框图
