USB通用串行总线音频回放录音外设(USB-APRP)UDA

1. INTRODUCTION...........................................................................................................................5
1.1 GENERAL INFORMATION...........................................................................................................5
1.2 UNIVERSAL SERIAL BUS OVERVIEW........................................................................................6
1.3 DEFINITIONS, ACRONYMS AND ABBREVIATIONS ...................................................................10
2. INSTALLING THE USB-APRP EVALUATION BOARD........................................................11
2.1 PC HARDWARE REQUIREMENTS ...........................................................................................11
2.2 PC SOFTWARE REQUIREMENTS............................................................................................11
2.3 BOARD INSTALLATION ............................................................................................................12
2.4 IN CASE OF PROBLEMS ...........................................................................................................13
2.4.1 “USB Device not responding” or “Unknown Device”...............................................13
2.4.2 Device is recognized but there is no sound.............................................................. 14
2.4.3 Sound is still coming from the ‘old legacy’ sound system .....................................14
2.4.4 Recording doesn’t work or the sound quality of recorded data is bad..................14
2.4.5 Known bugs on the current evaluation board...........................................................15
3. HARDWARE DESCRIPTION.....................................................................................................16
3.1 INPUT AND OUTPUT CONNECTORS........................................................................................17
3.2 JUMPERS, HEADERS AND SWITCHES ...................................................................................17
3.3 CHIP PIN OUT .......................................................................................................................... 18
3.4 SCHEMATICS..........................................................................................................................20
3.5 LIST OF ACTIVE COMPONENTS .............................................................................................. 21
3.5.1 Integrated Circuits ........................................................................................................ 21
3.5.2 Transistors & LED’s .....................................................................................................21
3.6 LIST OF PASSIVE COMPONENTS ............................................................................................22
3.6.1 Resistors.......................................................................................................................22
3.6.2 Capacitors .....................................................................................................................23
3.6.3 Inductors.......................................................................................................................25
3.6.4 Crystal Oscillators ........................................................................................................ 25
4. REFERENCES............................................................................................................................26
5. IN CASE OF PROBLEMS..........................................................................................................26