Microchip MCP3901 16位MCU ADC评估方案
Microchip 公司的MCP3901是双路模拟前端(AFE),包括有两个同步取样的16/24位Delta-Sigma ADC,两个PGA(可编增益到32V/V),相位延迟补偿电路,内部基准电压(温度漂移12 ppm/℃),调制器输出电路以及高速20Mz SPI兼容串行接口. MCP3901每路的SINAD为91dB,THD为-104dBc,SFDR为109dB,可编程取样速率高达64ksps,两个通路的串扰为-133dB,关断模式电流小于2uA,主要用在能量计量和功率测量,汽车电子,手提仪表,医疗和电源监视.本文介绍了MCP3901主要特性和功能方框图,时钟框图,以及ADC评估板的主要特性, 电路图与材料清单.
The MCP3901 is a dual channel analog front end (AFE) containing two synchronous sampling delta-sigma Analog-to-Digital Converters (ADC), two PGAs, phase delay compensation block, internal voltage reference, modulator output block, and high-speed 20 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 byte as well as six writable control registers to program gain, over-sampling ratio, phase, resolution, dithering, shutdown, reset and several communication features. The communication is largely simplified with various continuous read modes that can be accessed by the DMA of a MCU and with separate data ready pin that can directly be connected to an IRQ input of a MCU.
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