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LMH7324: 输出异常

Part Number: LMH7324


LMH7324接法如下图:

输入1KHz,高电平4.5V,低电平0V的正弦波,比较阈值VDAC设置为1V,

示波器测试2脚和3脚,波形如下:

高电平为1.96V,低电平为1.56V。

手册给出的是高电平为1.4V,低电平为1.0V。

已经把连接后级的电容去掉。

请问哪里有问题?