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DAC8822: I use dac8822 to Converting Digital Signal to Analog Signal,the Digital Signal from ads8584,but I can not get right Analog Signal.

Part Number: DAC8822

I use dac8822 to Converting Digital Signal to Analog Signal,the Digital Signal from ads8584,but I can not get right Analog Signal.

I input sinusoidal wave and convert it to digital signal with ads8584,This digital signal is directly given to DAC8822, but the output waveform of DAC8822 is square wave, which is consistent with the frequency of the input sine wave, and can be changed according to the input.

I want to know why and how to recover to sinusoidal wave.