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LM4949TL Datasheet(PDF) 35 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM4949TL
Description  Stereo Class D Audio Subsystem with OCL Headphone Amplifier
PDF  40 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4949TL Datasheet(HTML) 35 Page - National Semiconductor (TI)

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Application Information (Continued)
Input Mixer / Multiplexer
The LM4949 includes a comprehensive mixer/multiplexer
controlled through the I2C interface. The mixer/multiplexer
allows any input combination to appear on any output of the
LM4949. Control bits LSR_SSEL and LSL_SSEL (loud-
speakers), and HPR_SSEL and HPL_SSEL (headphones)
select the individual stereo input channels; for example,
LSR_SSEL = 1 outputs the right channel stereo input on the
right channel loudspeaker, while LSL_SSEL = 1 outputs the
left channel stereo input on the left channel loudspeaker.
Control bits LSR_MSEL and LSL_MSEL (loudspeaker), and
HPR_MSEL and HPR_LSEL (headphones) direct the mono
input to the selected output. Setting HPR_MSEL = 1 outputs
the mono input on the right channel headphone. Control bits
LS_XSEL (loudspeaker) and HP_XSEL (headphone) selects
both stereo input channels and directs the signals to the
opposite outputs, for example, LS_XSEL = 1 outputs the
right channel stereo input on the left channel loudspeaker,
while the left channel stereo input is output on the right
channel loudspeaker. Setting __XSEL = selects both stereo
inputs simultaneously, unlike the __SSEL controls which
select the stereo input channels individually.
Multiple input paths can be selected simultaneously. Under
these conditions, the selected inputs are mixed together and
output on the selected channel. Tables 5 and 6 show how the
input signals are mixed together for each possible input
selection combination.
TABLE 5. Loudspeaker Multiplexer Control
LS MODE
LS_XSEL
LSR_MSEL/
LSL_MSEL
LSR_SSEL/
LSL_SSEL
LEFT CHANNEL OUTPUT
RIGHT CHANNEL OUTPUT
0
0
0
MUTE
MUTE
1
0
1
0
MONO
MONO
2
0
0
1
LEFT (DIFF)/ /LIN+/LIN-/ (LIN+
- LIN-)
RIGHT (DIFF)/ /RIN+/RIN-/
(RIN+ - RIN-)
3
0
1
1
MONO + LEFT (DIFF)/
/LIN+/LIN-/ (LIN+ - LIN-)
MONO + RIGHT (DIFF)/
/RIN+/RIN-/ (RIN+ - RIN-)
4
1
0
1
LEFT (DIFF)/ /LIN+/LIN-/ (LIN+
- LIN-) + RIGHT (DIFF)/
/RIN+/RIN-/ (RIN+ - RIN-)
LEFT (DIFF)/ /LIN+/LIN-/ (LIN+
- LIN-) + RIGHT (DIFF)/
/RIN+/RIN-/ (RIN+ - RIN-)
5
1
1
1
MONO + LEFT (DIFF)/
/LIN+/LIN-/ (LIN+ - LIN-) +
RIGHT (DIFF)/ /RIN+/RIN-/
(RIN+ - RIN-)
MONO + LEFT (DIFF)/
/LIN+/LIN-/ (LIN+ - LIN-) +
RIGHT (DIFF)/ /RIN+/RIN-/
(RIN+ - RIN-)
TABLE 6. Headphone Multiplexer Control
HP
MODE
HP_XSEL
HPR_MSEL/
HPL_MSEL
HPR_SSEL/
LSL_SSEL
LEFT CHANNEL OUTPUT
RIGHT CHANNEL OUTPUT
0
0
0
MUTE
MUTE
1
0
1
0
MONO
MONO
2
0
0
1
LEFT (DIFF)/ /LIN+/LIN-/
(LIN+ - LIN-)
RIGHT (DIFF)/ /RIN+/RIN-/
(RIN+ - RIN-)
3
0
1
1
MONO + LEFT (DIFF)/
/LIN+/LIN-/ (LIN+ - LIN-)
MONO + RIGHT (DIFF)/
/RIN+/RIN-/ (RIN+ - RIN-)
4
1
0
1
LEFT (DIFF)/ /LIN+/LIN-/
(LIN+ - LIN-) + RIGHT
(DIFF)/ /RIN+/RIN-/ (RIN+ -
RIN-)
LEFT (DIFF)/ /LIN+/LIN-/
(LIN+ - LIN-) + RIGHT
(DIFF)/ /RIN+/RIN-/ (RIN+ -
RIN-)
5
1
1
1
MONO + LEFT (DIFF)/
/LIN+/LIN-/ (LIN+ - LIN-) +
RIGHT (DIFF)/ /RIN+/RIN-/
(RIN+ - RIN-)
MONO + LEFT (DIFF)/
/LIN+/LIN-/ (LIN+ - LIN-) +
RIGHT (DIFF)/ /RIN+/RIN-/
(RIN+ - RIN-)
Power Supplies
The LM4949 uses different supplies for each portion of the
device, allowing for the optimum combination of headroom,
power dissipation and noise immunity. The speaker amplifier
gain stage is powered from VDD, while the output stage is
powered from VDDLS. The headphone amplifiers, input am-
plifiers and volume control stages are powered from VDDHP.
The separate power supplies allow the speakers to operate
from a higher voltage for maximum headroom, while the
headphones operate from a lower voltage, improving power
dissipation. VDDHP may be driven by a linear regulator to
further improve performance in noisy environments. The I
2C
portion if powered from I
2CVDD, allowing the I2C portion of
the LM4949 to interface with lower voltage digital controllers.
www.national.com
35



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