信号输入到内部后,首先是一个模拟选择开关。一般模拟开关的信号范围不是都在电源范围之内吗?
我想确定下:信号范围是±500mV时,AVss确实是接地吗?如果是,为什么可以?
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The full-scale range (FSR) is defined by VFS+ = +VREF/GAIN and VFS-= -VREF/GAIN: FSR = VFS+ - VFS-= 2*VREF/GAIN. If VREF is sourced
externally, the analog input range should not exceed 80% of VFS+ or VFS-; i.e., VID = 0.8 VFS- to 0.8 VFS+. If VREF is sourced internally,
the given VID ranges apply.
SD是积分型采用,原理不一样,可以先了解一下积分型ADC原理。