This paper presents a R2R ladder network Digital to Analog Converter suitable for video applications. The active circuit was implemented in CSM 0.11μm CMOS Logic technology. The whole DAC consists of R2R ladder network DAC、output amplifier、level shift circuits、reference voltage and latchs. The simulation results of this work with integral non-linearity （INL） and differential non-linearity （DNL） is less than 1.65LSB and 0.23LSB, respectively. The power consumption is only 3.86 mW.%本文设计了一款用于视频中的R2R梯形电阻网络数模转换器。其电路结构包含8位R2R梯形电阻网络DAC、输出放大器、低电平转高电平电路、模拟开关、参考电压和锁存器电路。电路设计是基于CSM0.11μm CMOS Logic工艺,经HSPICE仿真表明,DAC的积分非线性误差（INL）和微分非线性误差（DNL）分别小于1.65LSB和0.23LSB,功耗仅为3.86mW。
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