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LSF0108电平转换输出有问题

Other Parts Discussed in Thread: LSF0108

Dear TI:

我们在用TI level shift LSF0108时,发现有电平转化后发生信号失真的情况。信号主要是多音频的i2S信号进行由1.8V电平到3.3V电平的转换:

 clk信号,ch1(黄色)为输入,1.8V电平,ch2(绿色)为输出:3.3V电平,目前采用上拉2.2K电阻为下面波形截图,我试过改变上拉电阻阻值,4.7K时输出上升沿失真更严重,300Ω时低电平无法下拉倒0,大概0.5左右。请帮忙分析下输出异常原因,谢谢~