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【求助】PGA281芯片没有输出

Other Parts Discussed in Thread: PGA281

想用PGA281做一个程控增益电路,单端输入,差分输出,实测芯片各管脚输入正常,但是两个输出脚始终是0,EF脚一直是低电平。电路图如下,VSP和VSN是正负9V,DVDD和VSOP是3.3V,希望大家能帮我看一下这个电路的问题在哪,非常感谢!