The DAC is divided into two part,the 8-bit MSB is converted into thermometer code and the binary weighted 4-bit LSB is used to get a better DNL error and guarantee monotonicity.

• 数模转换器采用分段式结构。分段方式是,低四位采用二进制码解码的结构，高八位采用温度码编码方式实现，以达到较佳的微分非线性误差(DNL)及确保数模转换器的单调性(monotonicity)。