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关于PGA305的应用问题

Other Parts Discussed in Thread: PGA305

最近基于PGA305调理芯片制作了两只0.5-4.5V输出的压力变送器样品,在测试过程中,发现一个奇怪的现象:开始5V供电,零点输出正常(0.5V左右),然后将电压调为0V,从0V慢慢往上升,电压恢复到5V时,零点输出5V,回不了0.5V,这是那个地方配置有问题吗?