AN726 查看數據表（PDF） - Silicon Laboratories

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AN726

UTILITY CLASS-D TOOLSTICK USER’S GUIDE

Silicon Laboratories 

AN726

5.6. USB Input/Output Mode

In USB input/output mode, the system samples and outputs data at 48 kHz. The USB data is 16-bit signed data.

Host PC

sound

software

Class-D RD Board

R

SiM3U1xx

USB

SARADC0

MIC

EPCA

L

Figure 12. USB Input/Output Mode Block Diagram

For playing (from PC to the board), the board receives data from the USB interface using the si32Library USB

Audio Component and outputs the PWM waveform on the EPCA0 module.

For recording (from board to the PC), the firmware measures the microphone (MK1) using one SARADC module

and sends the data to the PC using the si32Library USB Audio Component.

Figure 13 shows the data flow for the USB input/output mode.

Host PC

SiM3U1xx

sound

USB0

9-bit

R

software

quantization

hardware

gain stage

MIC

SARADC0

shift from 12

bits unsigned

to 16 signed

remainder-

weighted

dither

EPCA

L

Figure 13. USB Input/Output Mode Flow Diagram

Rev. 0.1

13

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