ADC即模拟数字转换器（英语：Analog-to-digital converter）是用于将模拟形式的连续信号转换为数字形式的离散信号的一类设备。一个模拟数字转换器可以提供信号用于测量。与之相对的设备成为数字模拟转换器。



典型的模拟数字转换器将模拟信号转换为表示一定比例电压值的数字信号。然而，有一些模拟数字转换器并非纯的电子设备，例如旋转编码器，也可以被视为模拟数字转换器。-ADC, Analog digital converter, is a type of device used to convert a continuous signal　a simulated form into a digital form.A analog digital converter can provide signals for measurement.The relative device becomes a digital analog converter.

A typical analog digital converter converts analog signals into digital signals that represent a certain proportion of voltage.However, some analog digital converters are not purely electronic devices, such as rotary encoders, or they can be regarded as analog digital converters