您可以看看这个两篇文档:
RTD Ratiometric Measurements and Filtering using the ADS1148 and ADS1248
RTD Ratiometric Measurements and Filtering Using the ADS1148 and ADS1248 Family of Devices
Hi
见如下文档: RTD Ratiometric Measurements and Filtering Using the ADS1148 and ADS1248 Family of Devices:
http://www.ti.com.cn/cn/lit/an/sbaa201/sbaa201.pdf
另外你还可以用TI的webench 仿真看看, 见官网: http://www.ti.com.cn/product/cn/ads1147
Hi huiyang,
是的,应用ADS1248一定要特别注意输入共模电压和输入差分信号满足Datasheet上的要求。而共模范围以及输入差分电压又和PGA直接相关,关于TI ADS124X系列数据转换器的共模电压问题,请参考以下分析:
http://e2e.ti.com/support/data_converters/precision_data_converters/w/design_notes/1370.input-voltage-range-requirements-for-the-ads1248…