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AFE5808的Vih, Vil看起来确实让人迷惑 ,DVDD只是AFE5808 的ADC数字部分供电电压,
这里的Vih和Vil参考的应该是AVDD,也就是说除了ADC数字部分,其他数字IO的Vih,Vil电压。 datasheet中Absolute maximum rating中:
Voltage at analog inputs and digital inputs: –0.3V~ [3.6, AVDD + 0.3]V
手册里,DVDD: ADC digital and I/O power supply, 1.8 V,应该包含数字IO,比如SPI 。
按照数据手册,与spi连接的单片机或fpga应该用什么电源电压?用1.8?还是3.3?还是1.8与3.3共用?