[原创] Microchip MCP3919三路ADC模拟前端(AFE)解决方案

Microchip公司的MCP3919是三路模拟前端(AFE),包括三路同步取样Delta-Sigma模数转换器(ADC),三路PGA,相位延迟补偿区块,低漂移基准电压,数字失调和增益误差效准寄存器以及高速20MHz SPI兼容串口.ADC具有16/24位分辨率,32-4096过取样比率(OSR),增益1x-32x,单独关断和重起,抖动和自动调零.主要用在多相电表,能量测量,汽车电子,手持仪表,音频/视频识别以及医疗和电源监测.本文介绍MCP3919主要特性,框图和应用电路,以及用于16位MCU的MCP3919 ADC评估板特性亮点,电路图,材料清单和PCB设计图.

The MCP3919 is a 3V three-channel Analog Front End (AFE) containing three synchronous sampling delta-sigma Analog-to-Digital Converters (ADC), three PGAs, phase delay compensation block, low-drift internal voltage reference, digital offset and gain error calibration registers and high-speed 20 MHz SPI-compatible serial interface.

The MCP3919 ADCs are fully configurable with features such as: -32x16/24-bit resolution, Oversampling Ratio (OSR) from 32 to 4096, gain from 1x to 32x, independent Shutdown and Reset, dithering and autozeroing.

The communication is largely simplified with 8-bit commands including various continuous read/write modes and 16/24/32-bit data formats that can be accessed by the Direct Memory Access (DMA) of an 8/16- or 32-bit MCU and with the separate data ready pin that can directly be connected to an Interrupt Request (IRQ) input of an MCU.
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