Digital-to-analog converter and performing method thereof

A performing method of a digital-to-analog converter, the digital-to-analog converter comprising a random rotation unit, a plurality of conversion units, and a summing unit, the random rotation unit comprising a pseudorandom number generator and a rotator, the performing method of the digital-to-analog converter comprising:

• the random rotation unit receiving a plurality of binary-weighted inputs and generating a plurality of rotated digital outputs according to a random rotation number;
• the conversion units respectively receiving one of the rotated digital outputs and generating a respective analog output;
• and
• the summing unit summing the respective analog outputs of the conversion units to generate an analog output,
• wherein the step of receiving the binary-weighted inputs and generating the rotated digital outputs according to the random rotation number comprises:
• the pseudo-random number generator generating the random rotation number;
• and
• the rotator shifting and rotating the binary-weighted inputs according to the random rotation number for generating the rotated digital outputs,
• wherein a frequency of generating the random rotation number from the pseudo-random number generator is reduced for decreasing a switching occurrence of the digital-to-analog converter in a low frequency band.