Audio player design example

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Description

The Audio Player Design Example, based on an NXP LPC2138 ARM7-based microcontroller, delivers high-quality, uncompressed, 16-bit digital audio playback. This design allows engineers to add MP3 music or sound effects to a variety of consumer applications at a very low cost. Entertaining sounds could be added to children's items or music clips could be easily added to products targeted at teens. There is no limit to the number of existing applications that could be enhanced by inexpensively adding high-quality sound or music.

Block Diagram

Documentation

• Audio Player

Products

Below are recommended microcontrollers for use in implementing this design to a system.

Comparison Table

Product	Pins	On-Chip Flash	On-Chip RAM	Comments
LPC2138	64	512KB	32KB	Base microcontroller used in the design example.
LPC2136	64	256KB	32KB	A lower-cost microcontroller with the same amount of on-chip RAM but with only half the on-chip flash memory.
LPC2146	64	256KB	32KB + 8KB	An upgraded microntroller with more on-chip RAM allowing for a real-time MP3 software decoder. The added USB interface allows file transfer with a personal computer.
LPC2148	64	512KB	32KB + 8KB	An upgrade to the LPC2138 microntroller, the LPC2148 substitutes Full-speed USB 2.0 device functionality for a slightly higher cost.

More Information

Images

Working Prototype

DAC Circuit                                                       SD Card InterfaceSchematics

• Audio Player

Example Code

• Audio Player

Disclaimer

This design example shows possible hardware and software techniques used to implement the design. It is imperative that the viewer use sound engineering judgment in determining the fitness of this design example for any particular application. This design example may include information from 3rd parties and/or information which may require further licensing or otherwise. Additional hardware or software design may be required. NXP Semiconductors does not support or warrant this information for any purpose other than an informational design example.

	documentation.pdf	418.54 KB
	schematics.zip	123.65 KB
	example.code_.zip	719.42 KB