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请TI 工程师推荐一款ADC
要求：单通道正负信号输入；分辨率24位；低噪音；
之前想用ADS1255，可惜不能输入负压
再请教一个问题：Vref= Vrefp - Vrefn = 2.5V- (-2.5V) = 5V
Vref = Vrefp - Vrefn =5V - 0V = 5V
这两个VREF对ADC有什么影响？
24bit ADC可以在这里面选择：
http://www.ti.com/lsds/ti/data-converters/precision-adc-less-10msps-products.page#
