The A/D converter (ADC) can be classified based on its operational features as follows:
Type I:
The Type I A/D converters can be classified into two groups as:
- Programmed A/D converters
- Non-Programmed A/D converters
Type II:
The Type II A/D converters can be classified into two groups as:
- Closed-loop or feedback type A/D converters
- Open-loop type A/D converters
Type III:
The Type III A/D converters can be classified into two groups as:
- Capacitor-charging type A/D converters
- Discrete voltage comparison type A/D converters
Type IV:
The Type IV A/D converters can be classified into two groups as:
- Direct type A/D converters
- Integrating type A/D converters