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ADS1292模拟电压输入范围达不到4.033V

Other Parts Discussed in Thread: ADS1292

ADS1292使用情况如下:

AVDD=5V,DVDD=3.3V,设置内部参考4.033V,PGA增益设置为1,但输入模拟电压大于3.3V时,采集值为7FFFFF,而小于3.3V时,采集值都是对的,即使到3.29V,只要一超过3.3V,采集值突然跳到7FFFFF。

而当设置内部参考为2.42V时则完全正确,当输入模拟电压在0~2.42V间变化时,采集值在0~7FFFFF间对应变化。

请问这是什么原因,即使输入管脚有二极管钳位,也应该钳位到5V-0.7V左右啊,请大伙帮我找到原因,谢谢