Hytera HD705 - Audio Amplifier; Figure 3-16 Diagram of Audio Signal Flow

Baseband Section Service Manual
16
OMAP5912
Audio is processed
via DSP.
UWIRE.SCLK
UWIRE.CS3
UWIRE.SDO
UWIRE.SDI
MCLK
MCBSP1.DR
MCBSP1.FSX
MCBSP1.DX
MCBSP1.CLKX
TLV5604
DAC
AD9864
MCBSP2.DX
DIN
DOUTA
MCBSP2.DR
RF TX
RF RX
Internal/
external MIC
input
APA
TDA8547TS
Gain: 31dB
Internal/external
speaker output
RX
TX
MIC
gain:
22dB
TX
TX
RX RX
Figure 3-16 Diagram of Audio Signal Flow
3.3.3 Audio Amplifier
Main parameters of TDA8547TS are listed in the table below:
Rated Power (Po)
0.5W R
L
=16Ω
Maximum Power
(Pmax)
1.2W R
L
=16Ω
The operation status of the audio amplifier is controlled via GPIO of OMAP. See the table below.
Mode-Amp SEL-SPK MODE SELECT OUT
1 1 0 0 OUT2
1 0 0 1 OUT1
0 1 1 1 Standby