Microchip MCP3911用于16位MCU双路模拟前端解决方案

Microchip公司的MCP3911用于16/24位MCU双路模拟前端(AFE),包含两个同时取样的Delta-Sigma ADC,两个PGA,相位延迟补偿区块,低漂移基准电压,调制输出区块,数字失调和增益误差校正寄存器以及高速20MHz SPI兼容串口.每路有 94.5 dB SINAD, -106.5 dBc THD, 111 dB SFDR,2.7-3.6V工作电压,可编数据速率高达125 ksps,主要用在能量和功率测量,汽车,手持仪表,医疗和电源监视以及音/视频识别.本文介绍了MCP3911主要特性,方框图以及用于16位MCU的MCP3911 ADC评估板主要特性, 和PIM MCU连接框图,电路图,材料清单和PCB元件布局图.
The MCP3911 is a 2.7V to 3.6V dual channel Analog Front End (AFE) containing two synchronous sampling Delta-Sigma Analog-to-Digital Converters (ADC), two PGAs, phase delay compensation block, low-drift internal voltage reference, modulator output block, digital offset and gain errors calibration registers, and high-speed 20 MHz SPI compatible serial interface.
The MCP3911 ADCs are fully configurable with features such as: 16/24-bit resolution, OSR from 32 to 4096, gain from 1x to 32x, independent shutdown and reset, dithering and auto-zeroing. The communication is largely simplified with the one-byte-long commands including various continuous read/write modes that can be accessed by the Direct Memory Access (DMA) of an MCU, and with a separate data ready pin that can be directly connected to an Interrupt Request (IRQ) input of an MCU.
The MCP3911 is capable of interfacing a large variety of voltage and current sensors including shunts, current transformers, Rogowski coils and Hall effect sensors.
MCP3911主要特性:
• Two Synchronous Sampling 16/24-bit Resolution Delta-Sigma A/D Converters
• 94.5 dB SINAD, -106.5 dBc Total Harmonic Distortion (THD) (up to 35th harmonic), 111 dB SFDR for Each Channel
• 2.7V - 3.6V AVDD, DVDD
• Programmable Data Rate up to 125 ksps
4 MHz Maximum Sampling Frequency
• Oversampling Ratio up to 4096
• Ultra Low Power Shutdown Mode with <2 μA
• -122 dB Crosstalk between the Two Channels