ADC0809是美国国家半导体公司生产的CMOS工艺8通道，8位逐次逼近式A/D模数转换器。其内部有一个8通道多路开关，它可以根据地址码锁存译码后的信号，只选通8路模拟输入信号中的一个进行A/D转换。是目前国内应用最广泛的8位通用A/D芯片

-ADC0809 National Semiconductor production CMOS process 8-channel, 8-bit successive approximation A/D analog-to-digital converter. The interior of an 8-channel multiplexer switch, it can be decoded according to the address code latch signal gating one of the 8-channel analog input signal is A/D conversion. Is currently the most widely used 8-bit general purpose A/D chip