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OPA445带宽问题

Other Parts Discussed in Thread: OPA445

使用OPA445反向放大电路将DAC出来的模拟信号放大14倍,放大器输出0~35V,但是使用示波器测试发现放大器输出信号只有1~2Hz,频率加快输出信号幅度就会降低,datasheet上说明OPA445全功率带宽有70KHz,为什么实际带宽这么低?希望得到您的解答,谢谢