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可以推荐AD转换芯片：要求输入范围0-10V，12位。想做AD转换模块，输入0-10V或者4-20mA，利用开关将电流信号转换为电压，已看了tida365，请求原理的详细讲解。目前选用AD芯片AD7895，但它的输入电压范围为正负10，有点浪费。
TI替代AD7895的芯片是ADS8506。
看下ADS8512 这款， 多种输入范围的选择，The converter can be configured for a variety of input ranges including ±10 V, ±5 V, 0 V to 10 V, and 0.5 V～4.5V。
www.ti.com/.../ads8512.pdf
