ADS1211 输入口的差压应该是多少？

ADS1211 接成差动输入 ，不用BIAS那个引脚的话 ，输入的差动电压 是多少啊？

输入端口相对于地的电压 要高多少呢？

The VBIAS output voltage is dependent on the reference input (REFIN) voltage and is approximately 1.33 times as great. This output is used to bias input signals such that bipolar signals with spans of greater than 5V can be scaled to match the input range of the ADS1210/11. Figure 12 shows a connection diagram which will allow the ADS1210/11 to accept a ±10V input signal (40V full-scale range).

端口的模拟信号的范围是不变的， 这个引脚只是用来在电阻网络中加入偏置，改变电阻网络前的电压范围，看手册的 图12。