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DAC8830输出35KHz正弦波幅值不对

Other Parts Discussed in Thread: DAC8830

用FPGA控制DAC8830,参考电压5V,能正常输出35Hz正弦波和118Hz方波,但输出35kHz正弦波峰峰值不对,输出的11.8kHz方波形状和峰峰值(应为5V)不对。为什么?

用示波器看35Hz方波从0V到5V的上升时间,为45us左右,芯片手册上说建立时间是1us,求解释。