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VCA821输出摆幅不够

Other Parts Discussed in Thread: TPS5430

看手册上,在正负5V供电情况下,貌似能到3.3V的输出。

我搭的821是10倍的放大,电阻选值和手册略有区别。80改成了75,402改成了390,其它一致。

电源是自己用TPS5430做了一个正负5给821供电(正电压大概4.85,负电压-5),然后发现输出到2.2V左右就开始出现削顶现象了,这是为什么呢?求助各位大神。