AN3126 Application note STMicroelectronics（AN3126应用注意法半导体）.pdfVIP

AN3126 Application note Audio and waveform generation using the DAC in STM32 microcontrollers Introduction This application note provides some examples for generating audio waveforms using the Digital to Analog Converter (DAC) peripheral embedded in STM32 microcontrollers. This document applies to products listed in Table 1, and should be read together with application note AN4566 “Extending the DAC performance of STM32 microcontrollers”. A digital to analog converter (DAC) is a device that has the opposite function to that of an analog to digital converter, i.e. it converts a digital word to a corresponding analog voltage. The STM32 DAC module is a 12-bit word converter, with up to three output channels to support audio functions. The DAC can be used in many audio applications such as security alarms, Bluetooth headsets, talking toys, answering machines, man-machine interfaces, and low-cost music players The STM32 DAC can also be used for many other analog purposes, such as analog waveform generation and control engineering. This application note is organized in two main sections: • Section 1 describes the main features of the STM32 DAC module. • Section 2 presents two examples. – In the first example, the DAC is used to generate a sine waveform – In the second example, the DAC is used to generate audio from .WAV files Table 1. Applicable products