Microchip MCP3903三相电表六路模拟前端解决方案

Microchip公司的MCP3903是业界首个用于三相电表的六路模拟前端(AFE),包括三对两个带PGA同步取样Delta-Sigma的16/24位ADC,相位延迟补偿区块,基准电压以及SPI兼容的高速10MHz串行接口.转换器中的抖动算法能降低闲音(idle tones),改善THD,SINAD为91dB,THD为-100dBc,SFDR为102dB,可编程数据速率高达64ksps,关断模式功耗小于2uA,任意两路间串扰为-115dB,内部基准电源的温票为5 ppm/°C,主要用在电表和能量测量,手提仪表以及医疗和电源监视等.本文介绍了MCP3903主要特性,功能方框图以及用于16位MCU的MCP3903 ADC评估板亮点,电路图和材料清单与PCB元件布局图.

Microchips First Six-Channel Analog Front End for Three-Phase Energy Metering Offers Industry-Leading Accuracy Microchip

The MCP3903 is a six-channel Analog Front End (AFE) containing three pairs made out of two synchronous sampling Delta-Sigma Analog-to-Digital Converters (ADC) with PGA, a phase delay compensation block, internal voltage reference, and high-speed 10 MHz SPI compatible serial interface. The converters contain a proprietary dithering algorithm for reduced idle tones and improved THD.

The internal register map contains 24-bit wide ADC data words, a modulator output register as well as six 24-bit writable control registers to program gain, over-sampling ratio, phase, resolution, dithering, shut-down, reset and several communication features.
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