UHF1 (400
‐
470 MHz)
Circuit Description
21
Pin No.
Signal
Function
I/O of the
Radio
Voltage of
Option Board
VDD=3.3 V
Remarks
20
3V6 or 5V
Power
O
Voltage: 5.0 V
/
5.2.4
Audio Module
U1002
McBSP1
Vol_Ctl
Vol_Ctl
ADC
DAC
Left
DAC
Right
MMP
MAP
PA_Enable
U3002
INT_SPK
EXT_SPK
Codec_Out
PUB_ADDRESS1
PUB_ADDRESS2
Mic_Bias
HANDSET_AUDIO
U3005B
INT_MIC
EXT_Mic Bias
EXT_Mic Enable
EXT_MIC
SSI
PUB_ADDRESS_MIC_EN
U3006A
RX Audio Path
U1002 sends digital audio to the audio processor Codec via the SSI bus of McBSP1. This bus is
composed of CLKX, FSX, DX and DR. The bus sends the 16-bit demodulated PCM audio signal to the
Codec, and adjusts the signal to appropriate amplitude according to the volume (RMS should be 80 mV
when frequency is 1 kHz and deviation is 3 kHz). Then the Codec converts PCM data into analog audio
data via DAC.
U3001 provides two outputs: SPK1 and SPK2. SPK1 is amplified by U3003 and then is fed to the PA
U3002, to derive two outputs of received audio, which will be applied to the front panel speaker and
further development interface respectively. SPK2 is amplified and divided into the four paths of signal
Содержание MD652
Страница 1: ...DIGITAL MOBILE RADIO...
Страница 5: ...UHF1 400 470 MHz...
Страница 9: ...Product Controls UHF1 400 470 MHz 2 Bottom View No Part Name No Part Name 1 Label 3 Fan 2 Fan Cover...
Страница 15: ...Exploded View and Packaging Guide UHF1 400 470 MHz 8 3 2 Packaging Guide...
Страница 53: ...43 9 PCB View Front Panel PCB View Top Layer X...
Страница 54: ...44 Front Panel PCB View Bottom Layer...
Страница 55: ...45 Main Board PCB View Top Layer...
Страница 56: ...46 Main Board PCB View Bottom Layer...
Страница 106: ...VHF1 136 174 MHz...
Страница 110: ...Product Controls VHF1 136 174 MHz 2 Bottom View No Part Name No Part Name 1 Label 3 Fan 2 Fan Cover...
Страница 116: ...Exploded View and Packaging Guide VHF1 136 174 MHz 8 3 2 Packaging Guide...
Страница 154: ...43 9 PCB View Front Panel PCB View Top Layer...
Страница 155: ...44 Front Panel PCB View Bottom Layer...
Страница 156: ...45 Main Board PCB View Top Layer...
Страница 157: ...46 Main Board PCB View Bottom Layer...
Страница 207: ...1616300000360 11 2014 L07157 2014 Hytera Communications Corporation Limited Hytera Communications Corporation Limited...