Interface circuit between AD574A and single chip microcomputer

The interface circuit of the single-chip microcomputer composed of the AD574A integrated chip is shown in the figure. This circuit uses the AD574A fast 12-bit successive approximation A/D converter, which is a hybrid integrated conversion chip composed of two bipolar circuits. It has high accuracy and speed. It is a widely used A/D converter at present, and the interface circuit it constitutes is also widely used.