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ADS1230: 单端输入设计(非桥),读取的20bit adc值偏小很多。

Part Number: ADS1230

设计为单端输入,选择64增益,参考电压4.86,AINP与AINN之间20mv时,读取adc值都只有0x2e7c(11900),远小于文档中的满量程2^17。

目前改变输入电压,得到的adc值是线性的。但是远小于量程设定的值,感觉增益不是64或者128,而是1.7或者3.4。通过示波器抓过数据脚DOUT了,确认高位确实都是0。