General System Description; Figure 2. Stm32F103 Usb Demonstration Kit - Block Diagram - ST STM32 User Manual

General system description

4 General system description
The STM32F103 USB demonstration kit consists of two boards. The STM32F103 controller
board receives the audio data through USB from PC and transfers them into the I
stream in the PCM16 format suitable for the TS4657 audio DAC. In addition, the
STM32F103 can act as an interface with a microphone line connected to the microcontroller
ADC pin.
The second board performs the audio function, using the TS4657 digital to analog converter
(DAC). Its output is passed to TS4962 Class-D mono amplifier that either feeds the onboard
speaker or drives the external mono speaker through the onboard mono jack connector. The
DAC output is also connected to TS2012 stereo Class-D amplifier which output is available
outside the board for external stereo speakers through terminal connectors. The audio input
is available through the onboard microphone which output is amplified by TS472
microphone preamplifier. This microphone line is considered to be connected to the ADC
input of the microcontroller on the STM32F103 controller board.
Figure 2.
USB
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www.BDTIC.com/ST
STM32F103 USB demonstration kit - block diagram
TS4657
I 2 S
STM32
Digital control
Analog
Doc ID 15867 Rev 1
Stereo
RCA RCA
lineout
TS2012
TS4962
TS472
UM0722
2
S data
Connectors
for
external
speakers
Onboard
speaker
Mono jack
for
external
speaker
On board
microphone
AM00480