- Audio Playback using PWM signal from dsPIC/PIC24H Output Compare module
- 4th order Low pass filter for Audio PWM signal demodulation
- 16/24 bit Audio Codec
- 4 Mega bit Serial Flash
- 110mW Headphone Amplifier
- Microphone and Line input with adjustable gain
- Line output with adjustable gain
- Works with Explorer 16 Development Board and 16-bit 28 pin Starter Board
The Audio PICtail Plus Daughter Board is used with the Explorer 16 Development Board to facilitate rapid implementation, development and testing of full duplex speech and audio applications. The card features low cost speech and audio playback circuitry, microphone and line pre-amp with adjustable gain control, headphone amplifier, 16/24 bit codec for high fidelity applications and 4 Mega bit serial flash memory. The card also features circuitry required for the dsPIC DSC devices with Audio DAC.
The Audio PICtail Plus Daughter Board fits into the expansion slot on the Explorer 16 Development Board and interfaces between an external audio device and the dsPIC33F or PIC24H device on the Explorer 16 Development 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 (OCPWM) module as a Pulse-Width Modulated (PWM) digital waveform. On some dsPIC33F devices, the output can be generated by the Digital-to-Analog Conversion (DAC) 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 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). Power is supplied to the Audio PICtail Plus Daughter Board by the Explorer 16 Development Board.
Key Applications: full duplex speech and audio applications
|Sample code||Example Code for Audio PICtail Plus Daughter Board (.zip)|