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关于THS4505输出的问题

Other Parts Discussed in Thread: THS4505

今天在TINA上仿真了由全差分放大器THS4505构成的单端到差分转换电路,电路图及各参数如下。输入为Vpp=1V,f=10kHz的正弦信号,按照电路原理分析,增益应该是Av=Rf/Rg,按照datasheet的测试参数,我选Rf=Rg=499Ω,那么增益应该是Av=1,但是通过示波器显示的波形(波形图如附图),信号却是衰减了200倍以上,峰峰值还不到4mV,对于这点我百思不得其解,也不知道是遗漏了芯片手册上的哪些要点,还请大师指导指正,谢谢!