HIMA F6705 能够产生数字定义的传输信号
最常见的电子DAC类型有:[2]
这脉冲宽度调制器一个马厩目前的或者电压被切换到低通模拟滤波器持续时间由数字输入码决定。这种技术通常用于电机速度控制和变暗LED灯。
过采样DAC或插值DAC,如采用δ-σ调制使用脉冲密度转换技术采样过密。利用delta-sigma DACs可以实现每秒10万个样本以上的速度(例如192 kHz)和24位分辨率。
二进制加权DAC,包含连接到求和点的DAC每位的独立电子元件,通常为运算放大器。求和中的每个输入都具有2的幂加权,最大电流或电压位于最高有效位。这是最快的转换方法之一,但精度较差,因为每个电压或电流都需要高精度。[3]
转变电阻器DAC包含一个并联电阻网络。网络中的各个电阻根据数字输入使能或旁路。
转变电源DAC,根据数字输入从中选择不同的电流源。
转变电容器DAC包含一个并联电容网络。单个电容器根据输入与开关连接或断开。
这R-2R梯子DAC是一种二进制加权DAC,使用电阻值R和2R的重复级联结构。由于等值匹配电阻的生产相对容易,因此可以提高精度。
逐次逼近或循环DAC,[4]其在每个周期中连续构造输出。每个周期都会处理数字输入的各个位,直到考虑到整个输入。
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