Theory of Operation
: Controller
3-37
3.2.5.2 RX Audio path
The RX audio path supports one external speaker.
Figure 3-29. RX Audio Path Block Diagram
For the external speaker path, the digital audio data is sent from the OMAP1710's McBSP1 port to
the TI AIC33 CODEC for digital to analog conversion and volume control. The external speaker path
uses the MAKO IC's class-AB audio power amplifier to drive 16 Ohm to 28 Ohm external speakers.
The input to MAKO IC's audio power amplifier is fully differential and comes from the TI CODEC's
RIGHT_LOP and RIGHT_LOM. The output of the MAKO IC's audio amplifier is also fully differential
and available on pins EXT_SPKR_P and EXT_SPKR_M.
MAKO
OMAP DSP
SSI
MCBSP1
Switch
Low - Pass Filter
20kHz Corner
ARM SPI
SPI
SPI
AB AMP
AB AMP
External/
Accessory Speaker
~ 16-20 Ohms
SSI
I2C
I2C
RIGHT LINE
OUT
LEFT LINE
OUT
TI CODEC
DSP
SPI
SSI
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: ......