Hytera PD502, Service Manual, Page: 24 / 136

VHF (136-174 MHz) Circuit Description
18
MCSI1.SYNC(W8)
MCSI1.CLK(M15)
MCSI1.DOUT(W14)
U1002
OMAP5912
CS
SKY72310
SCK
Data
5.1.3
Audio Module
Audio Diagram
The audio module is mainly for audio input and output. TLV320AIC29 is used as the audio codec to
convert and process audio signal and digital signal. The audio amplifier TDA2822 is used to amplify the
analog audio signal.
DSP processes digital signal (including audio signal encoding/decoding, digital signal decoding, and
digital audio signal processing). AD9864 converts and processes the RF IF signal, and sends the
undemodulated serial digital signal to the DSP for processing. Then TLV5614 converts the digital signal
output by DSP to analog signal.
TLV320AIC29
MIC Input
IIS
SPI
OMAP5912
Process via DSP
McBSP1
uWire
SPI(CS2)
AD9864
TLV5614
DAC
M
cB
SP
2
SPI
SSI
SSI
RX
TX
APA
TD2822
Speaker
Diagram of Signal Flow
The microphone converts the audio signal into electrical signal, which is then amplified by PGA of the
codec and sent to ADC of the codec for sampling. After digital audio processing, the signal is output to