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ADS1110模拟输入0V时I2C输出满量程问题

Other Parts Discussed in Thread: ADS1110

我们公司一直大量运用ADS1110的ADC芯片,最近连续出现模拟端输入在0V(就几mv)时输出满65536量程问题,而在较大的模拟输入电压(比如0.5V,1V...)时,I2C数字端输出正常的; ADC设置为15bit, 增益为1;VIN-接GND,VIN+为模拟输入。

请问这是为什么?芯片坏了?但是电压较大时,输出是正常的。

请帮忙分析解答。谢谢!