ANALOGUE to DIGITAL (A/D) Converter What is a Sample & Sample rate? A "sample" is a single measurement of amplitude. Sample rate is simply the number of samples (or measurements of amplitude) taken per second. Sampling Intervals Quantization The samples are assigned a binary number approximating their sampled value. Quantizing divides up the sampled voltage range into 2n-1 quantizing intervals, where “n” is the number of bits per sample (the sampling resolution). For example, an 8-bit system can identify 28 (256) discrete sampled signal values (255 quantizing intervals). The amplitude of such a signal can occupy the entire quantizing range. A/D Reference Voltages Successive Approximation A/D Example 1 Example 2 Example 3 A/D Converter Modules in PIC16F87X series 28-pin devices has 5 modules. (AN0-AN4) PIC16F873 PIC16F876 4...
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