SGTL5000_13 Datasheet, PDF (20/68 Pages) Freescale Semiconductor, Inc – Low Power Stereo Codec with Headphone Amp

FUNCTIONAL DEVICE OPERATION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Set DAP_CONTROL->DAP_EN to enable DAP block
From
Source
Select
Swtich
Main Input
Mix Input
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VVolume
CControl
((AAVVC))
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Each DAP sub-block can be configured in a pass-through mode
7-Band
Parametric
EQ
5-Band
Graphic
EQ
Tone
Control
To
Source
Select
Swtich
Only one of PEQ/GEQ/TC
can be used at a time
Figure 12. Digital Audio Processing Block Diagram
When the DAP block is added in the route, it must be
enabled separately to get audio through. It is recommended
to mute the outputs before enabling/disabling the DAP block
to avoid any pops or clicks due to discontinuities in the output.
Refer to Digital Audio Processor Configuration for
programming examples on how to enable/disable the DAP
block.
Each sub-block of the DAP can be individually disabled if
its processing is not required. The following sections describe
the DAP sub-blocks and how to configure them.
Dual Input Mixer
The dual input digital mixer allows for two incoming
streams from the source select switch as shown in DAP -
Dual Input Mixer.
Main Channel Volume
DAP_MAIN_CHAN->VOL
Main Channel
From Source Select Switch
Sum
Mixer Output
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Mix Channel
From Source Select Switch
Mix Channel Volume
D AP_MIX _CH AN- >VO L
Figure 13. DAP - Dual Input Mixer
The Dual Input Mixer can be enabled or configured in a
pass-through mode (Main channel is passed through without
any mixing). When enabled, the volume of the main and mix
channels can be independently controlled before they are
mixed together.
The volume range allowed on each channel is 0% to 200%
of the incoming signal level. The default is 100% (same as
input signal level) volume on the main input and 0% (muted)
on the mix input.
Refer to Dual Input Mixer for programming examples on
how to enable/disable the mixer and also to set the main and
mix channel volume.
Freescale Surround
Freescale Surround is a royalty free virtual surround
algorithm for stereo or mono inputs. It widens and deepens
the sound stage of the music input.
SGTL5000
20
Analog Integrated Circuit Device Data
Freescale Semiconductor