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VCA610当Vc端为-2V不能放大

用VCA610做AGC电路,但测试VCA610时,发现当Vc-=1V时,同相接地,反相输入1kHz,300mV正弦波时,Vout不变。当Vc<-1V时,Vout变小。当Vc=-1.5V时,Vout为无波峰的正弦波。当Vc=-2V时,无输出。按照手册上说,-2V<Vc<-1V时,应该线性放大的,不知什么原因