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关于MSP430FG479的SD16A使用一个小问题

因为我ADC采集是正电压,所以我选择单极性输出。比如我选择了channel 0,模拟输入口选择A3差分对。我实际的电路图A3+连接至了模拟信号,但A3-我悬空,实际测试发现A3-悬空和接地,ADC采集转换得到的值是一样的,不知道怎么解释,A3-需要接地吗?

望TI大神能给予下点拨,谢谢