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 Speake
~ 16-20 Ohms
SSI
I2C
I2C
RIGHT LINE
OUT
LEFT LINE
OUT
TI CODEC
DSP
SPI
SSI
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