Digital PDM-input mono 3.4 W Class-D audio amplifier TFA9881 stereo evaluation board
The demo board is designed to operate the TFA9881 device easily. The demo board can be used in two different configurations. A first configuration is a stand-alone configuration with the main demo board only, and a second Cyclone configuration comprises the main demo board plus a Cyclone III FPGA-board. In the stand alone configuration the audio input needs to be a PDM audio signal which goes directly to the amplifier input. In the Cyclone configuration the input can be either an I²S or analog audio signal. This will be converted to a PDM-audio stream by the FPGA which then goes into the amplifier. The FPGA is also used to embed TFA9881 specific control tokens into the PDM audio stream. The included software can be used to control the demo board from a PC environment.
製品詳細
Features
M52277 External Interfaces
- Replaceable stereo translation PCB, containing two TFA9881UK devices (stereo operation is supported)
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Supported audio inputs for the demo board:
- Stereo analog input (ADC + clock generator, I2S-output format, FS = 48 kHz); audio signal is converted to PDM through FPGA board
- Stereo digital input, industry standard I2S format, 64*FS and 128*FS; audio signal is converted to PDM through FPGA board
- Stereo digital input, PDM format
- Demo board can be configured via USB and included software (suitable for Microsoft Windows)
- Only one supply voltage required for PCB board powering
- 15 kV ESD protection provided at all amplifier outputs
- Connectors and mounting facilities for active speaker modules
- Automatic configuration of demo board upon analog audio plug-in and / or FPGA board insertion