Microchip Technology AC164129 데이터 시트

™ 

© 2007 Microchip Technology Inc.

DS70297A-page 7

Thank you for purchasing Microchip Technology’s Audio PICtail

 

Plus Daughter Board. 

This board provides a low-cost interface for speech sampling and playback. The Audio 
PICtail

 

Plus Daughter Board is used with the Explorer 16 Development Board to 

demonstrate an effective software technique for processing acceptable voice quality 
audio without the use of a codec device. 
This chapter introduces the Audio PICtail

 

Plus Daughter Board and provides an 

overview of its features. Topics covered include:
• Overview
• Board Setup
• Reference Documents

The Audio PICtail

 

Plus Daughter Board fits into the expansion slot on the Explorer 16 

board and interfaces between an external audio device and the dsPIC33F or PIC24H 
device on the Explorer 16 board. Audio input signals are routed to the Analog-to-Digital 
Converter (ADC) module on the dsPIC33F or PIC24H device for software processing. 
Output signals can be generated by the dsPIC33F or PIC24H on the Output Compare 
PWM module as a pulse-width modulated digital waveform. On some dsPIC33F 
devices the output can be generated by the Digital-to-Analog Conversion module as a 
pair of differential signals.
A PWM output signal is converted to an analog signal by a low-pass filter on the Audio 
PICtail

 

Plus Daughter Board. A Digital-to-Analog Converter (DAC) signal pair is 

converted to a single-ended analog signal by a differential amplifier on the Audio PICtail

 

Plus Daughter Board. 
The output signals from the Audio PICtail

 

Plus Daughter Board are then appropriately 

amplified for the selected output type (line or speaker).
The Explorer 16 board supplies power to the Audio PICtail

 

Plus Daughter Board.

The Audio PICtail

 

Plus Daughter Board is shown in Figure 1-1.