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单通道12/16位串行输入电流源和电压输出数模转换器HART连接ad5412/AD5422数据表
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The AD5412/AD5422 are low cost， precision， fully integrated 12-/16-bit digital-to-analog converters （DAC） offering a programmable current source and programmable voltage output designed to meet the requirements of industrial process control applications. The output current range is programmable at 4 mA to 20 mA， 0 mA to 20 mA， or an overrange function of 0 mA to 24 mA. The LFCSP version of this product has a CAP2 pin so that the HART signals can be coupled onto the current output of the AD5412/AD5422. Voltage output is provided from a separate pin that can be configured to provide 0 V to 5 V， 0 V to 10 V， ±5 V， or ±10 V output ranges; an overrange of 10% is available on all ranges. Analog outputs are short and open-circuit protected and can drive capacitive loads of 1 µF. The device operates with an AVDD power supply range from 10.8 V to 40 V. Current loop compliance voltage is 0 V to AVDD − 2.5 V. The flexible serial interface is SPI- and MICROWIRE™-compatible and can be operated in 3-wire mode to minimize the digital isolation required in isolated applications. The device also includes a power-on-reset function， ensuring that the device powers up in a known state. The part also includes an asynchronous clear pin （CLEAR） that sets the outputs to zero-scale/midscale voltage output or the low end of the selected current range. The total output error is typically ±0.01% in current mode and ±0.01% in voltage mode
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