Generally, it depends on what signal is processed. The chip for processing digital signals is a digital chip, and the chip for processing analog signals is an analog chip.

Digital chip

The digital chip processes digital signals, high-level and low-level input and output, that is, input and output processing of 0 and 1; Some gate circuits such as 74LS00.

Analog chip

The analog chip processes analog signals, and it processes linear analog voltage or current signals. Some operational amplifiers such as LM353.

Hybrid processing chip

The distinction is not particularly strict, and some hybrid processing chips can process digital signals and analog signals at the same time; Some waveform conversion chips such as LM33 1 and some timer chips such as NE555.