Patent ID: 7859445

Claim:
A digital to analog converter with two outputs, controlled by an n-bits input signal, comprising: a reference voltage circuit generating (2 n +1) reference voltages; a first switch array receiving and outputting 2 n selected reference voltages among the (2 n +1) reference voltages according to the first bit of input signal; a second switch array receiving the 2 n selected reference voltages and outputting a first voltage of the selected reference voltages via a first output terminal and a second voltage of the selected reference voltages via a second output terminal according to the bits of input signal except for the first bit, wherein all (2i+1)th reference voltages are directly transmitted to the second switch array, and (2i+1) is the odd number between 0 and 2 n ; and a switch circuit to output the first voltage and the second voltage.