Analog-to-Digital Conversion

- Sampling – converts the continuous signal into a series of discrete analog signals at periodic intervals
- Quantization – each discrete analog is converted into one of a finite number of (previously defined) discrete amplitude levels
- Encoding – discrete amplitude levels are converted into digital code.

Features of an ADC

- Sampling rate – rate at which continuous analog signal is polled e.g. 1000 samples/sec
- Quantization – divide analog signal into discrete levels
- Resolution – depends on number of quantization levels
- Conversion time – how long it takes to convert the sampled signal to digital code
- Conversion method – means by which analog signal is encoded into digital equivalent
- Example – Successive approximation method