SGTL5000XNAA3R2 Datasheet, PDF (21/68 Pages) Freescale Semiconductor, Inc – Low Power Stereo Codec with Headphone Amp

FUNCTIONAL DEVICE OPERATION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Input
From Dual Mixer
SFigremesacTaleel
S^Su^ur^rr^ro^ou^un^ndd
Output
T^To^{o F}S^rG^eeT^scL^alB^e a^Bs^as^ssE^Enⁿh^ha^anⁿc^ce^e
DAP_SGTL_SURROUND
-> WIDTH_CONTROL
->SELECT
The Freescale Surround can be enabled or configured in
pass-through mode (input is passed through without any
processing). When enabling the Surround, mono or stereo
input type must be selected based on the input signal.
Surround width may be adjusted for the size of the sound
stage.
Refer to Freescale Surround and Freescale Surround On/
Off for a programming example on how to configure Surround
width and how to enable/disable Surround.
Freescale Bass Enhance
Freescale Bass Enhance is a royalty-free algorithm that
enhances natural bass response of the audio. Bass Enhance
extracts bass content from right and left channels, adds bass
and mixes this back up with the original signal. An optional
complementary high pass filter is provided after the mixer.
InpInuptut
(⁽F^frr^oo^mm ^FS^rG^eeT^sL^caS^lu^er^Sro^uu^rn^rod^u)^nd)
DAP_BASS_ENHANCE_CTRL
->LR_LEVEL
DAP_BASS _ENHANCE_CTRL
->CUTOFF_HPF
->BYPASS _HPF
High Pass
Filter
Output
(To PEQ/GEQ/TC)
Low Pass
Filter
Bass
Enhance
DAP_BASS_ENHANCE
->CUT_OFF
DAP_BASS_ENHANCE_CTRL
->BASS _LEVEL
Figure 14. DAP- Freescale Bass Enhance
The Freescale Bass Enhance can be enabled or
configured in pass-through mode (input is passed through
without any processing).
The cutoff frequency of the low-pass filter (LPF) can be
selected based on the speakers frequency response. The
cutoff frequency of the low-pass and high-pass filters are
selectable between 80 to 225 Hz. Also, the input signal and
bass enhanced signal can be individually adjusted for level
before the two signals are mixed.
Refer to Freescale Bass Enhance and Bass Enhance On/
Off for a programming example on how to configure Bass
Enhance and how to enable/disable this feature.
7-Band Parametric EQ / 5-Band Graphic EQ / Tone
Control
One 7-band parametric equalizer (PEQ), one 5-band
graphic equalizer (GEQ), and Tone Control (Bass and Treble
control) blocks are implemented as mutually exclusive
blocks. Only one block can be used at a given time.
Refer to 7-Band Parametric EQ / 5-Band Graphic EQ /
Tone Control for a programming example that shows how to
select the desired EQ mode.
7-Band Parametric EQ
The 7-band PEQ allows the designer to compensate for
speaker response and to provide the ability to filter out
resonant frequencies caused by the physical system design.
The system designer can create custom EQ presets such as
Rock, Speech, Classical, etc, which allows users the
flexibility to customize their audio.
The 7-band PEQ is implemented using 7 cascaded
second order IIR filters. All filters are implemented using
programmable bi-quad filters. Figure 15 shows the transfer
function and Direct Form 1 of the five coefficient biquadratic
filter.
Analog Integrated Circuit Device Data
Freescale Semiconductor
SGTL5000
21