关键词: D A转换, 权电流, 串并转换, 低通滤波

Abstract:

The analog signal is better than the digital signal in the transmission medium,so a digital to analog converter is designed.System View is used to simulate the DAC module.Then the D/A conversion hardware circuit is designed.A frontend parallel/serial conversion circuit is designed,which makes possible D/A conversion of both 8bit parallel digital signals and 8bit serial digital signals.On the output side,an active secondorder lowpass filter circuit is included so the analog output is smoother.Lower waveform attenuation within the practical range is achieved.

Key words: DAC;power current;series and transforms;low pass filter