3-36
Theory of Operation
: Controller
3.2.5
Audio
The audio section of the Controller design consists of:
• TI AIC33 voice CODEC
• MAKO audio sub-block
3.2.5.1 TX Audio path
The TX audio paths begin with accessory microphone. There is one external microphone path going
to the main flex connector.
Figure 3-28. Audio TX Path Block Diagram
The external microphone path will be supported by the TI AIC33 CODEC, using the LINE1LP pin on
the IC. The LINE1LP is multiplexed with the MIC3R within the CODEC, and selected as the input
when the external microphone path is chosen as the TX audio source. The TI CODEC amplifies and
samples the external microphone signal. The digital data is sent to the OMAP1710's DSP through
the McBSP1 port using the audio SSI bus.
OMAP DSP
MAKO
Audio Stereo Codec (TI AIC33)
SSI
SSI
MCBSP1
VC_DCLK
VC_FSYNC
VC_TX
VC_RX
SSI
LEFT
ADC
RIGHT
ADC
DSP SPI
SPI
MIC BIAS
Reset Out
Reset
External/
Accessory
Microphone
I2C
I2C
Line 1L
Mic 3R
Mic 3L
4
1
Summary of Contents for Astro APX 3000
Page 1: ...APXTM TWO WAY RADIOS APX 3000 DETAILED SERVICE MANUAL ...
Page 2: ......
Page 4: ...Notes ...
Page 6: ...vi Document History Notes ...
Page 10: ...x Table of Contents Notes ...
Page 12: ...xii List of Tables Notes ...
Page 18: ...xviii List of Figures Notes ...
Page 22: ...xxii CommercialWarranty Notes ...
Page 46: ...3 20 Theory of Operation Main Board Notes ...
Page 84: ...3 58 Theory of Operation Bluetooth Notes ...
Page 208: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 222: ...7 14 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 282: ...8 60 Schematics Boards Overlays and Parts Lists Main Board Block UHF1 84012513001_A Notes ...
Page 390: ...8 168 Schematics Boards Overlays and Parts Lists Main Board Block VHF 84012512001_A Notes ...
Page 456: ...9 8 Debugging Fixture Powering up Covert Board Notes ...
Page 468: ...Glossary 10 Glossary Notes ...
Page 472: ...Index 4 Index Notes ...
Page 473: ......