LM4831VF National Semiconductor, LM4831VF Datasheet - Page 6

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LM4831VF

Manufacturer Part Number
LM4831VF
Description
IC AMP AUDIO PWR 1.5W AB 44LQFP
Manufacturer
National Semiconductor
Series
Boomer®r
Type
Class ABr
Datasheet

Specifications of LM4831VF

Output Type
2-Channel (Stereo)
Max Output Power X Channels @ Load
1.5W x 2 @ 4 Ohm
Voltage - Supply
2.7 V ~ 5.5 V
Features
Depop, Input Multiplexer, Microphone, Shutdown
Mounting Type
Surface Mount
Package / Case
44-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LM4831VF

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Pin Descriptions
PWRDWN
L_INA,
L_INB,
L_INC
R_INA,
R_INB,
R_INC
L_MIX,
R_MIX
L_EQOUT,
R_EQOUT
L_EQIN,
R_EQIN
L_MUX,
R_MUX
This pin is used to power down the
entire IC (except BEEP Circuitry).
Placing a logic high on the PWRDWN
pin will place the LM4831 in a low
supply current state. To minimize the
shutdown-mode supply current, the
PWRDWN pin should be pulled up to
the voltage on the LM4831 power
supply pins. The PWRDWN pin is
overridden if an edge change occurs
on any of the BEEP A–D inputs.
These pins are the left channel inputs.
Typical input impedance on each input
is 20 k .
These pins are the right channel
inputs. Typical input impedance on
each input is 20 k .
These pins are the inverting input
nodes of the input mixer for the left
and right channel, respectively.
These are the outputs of the input
mixer for the left and right channel,
respectively. This output is generally
fed to an external filter to equalize the
response of internal computer
speakers and then back into the EQIN
pins.
These pins are one of the two inputs
to the 2:1 analog multiplexer and are
used to feed in externally filtered
versions of the EQOUT signals. The
2:1 multiplexer selects the signal on
L_EQIN and R_EQIN if the HP_IN
and DS_IN pins are both low.
These are the stereo outputs of the
2:1 analog multiplexer. The output of
the 2:1 multiplexer is decided by the
state of the HP-IN and DS-IN pins. If
both HP-IN and DS-IN are low, the 2:1
mux selects the analog input on the
EQIN pins. If either HP-IN or DS-IN is
high, the 2:1 mux selects the internal
analog path. See .
(Continued)
6
L_LINEOUT,
R_LINEOUT
L_PA+IN,
R_PA+IN
L_PA−IN,
R_PA−IN
L_PA−OUT,
R_PA−OUT
L_PA+OUT,
R_PA+OUT
These are the line outputs for the left
and right channel, respectively.
Although these outputs are capable of
driving a wide range of resistive loads,
they are typically used to drive an
impedance of at least 10 k . These
outputs are only enabled when the
DS-IN pin is high, otherwise, they are
in a high-impedance state.
These pins are the positive inputs of
the output audio power amplifiers.
Since the power amplifier is typically
configured as an inverting amplifier,
these pins should be connected to the
BYPASS pin to properly bias the
output power amplifiers. Further, these
pins should be individually bypassed
with a capacitor of 0.01 µF–0.1 µF.
These pins are the inverting inputs for
the output audio power amplifier for
the left and right channel, respectively.
These pins are the inverted power
amp outputs for the left and right
channel, respectively. In bridged mode
(DS-IN = HP_IN = PWRDWN = low),
each output drives one terminal of a
direct coupled bridged speaker. In
single-ended (headphone) mode,
(HP_IN = high, PWRDWN = low,
DS-IN = N/A) these outputs drive a
capacitively coupled stereo
headphone. In docking station mode
(DS-IN = high, HP_IN = PWRDWN =
low), these outputs are disabled.
These pins are the non-inverted power
amp outputs for the left and right
channel, respectively. In bridged mode
(DS-IN = HP_IN = PWRDWN = low),
each output drives one terminal of a
direct coupled bridged speaker. In
single-ended (headphone) mode
(HP_IN = high, PWRDWN = low,
DS-IN = N/A), these outputs are in a
high impedance state, effectively
muting the bridged loudspeaker. In
docking station mode (DS-IN = high,
HP_IN = PWRDWN = low), these
outputs are disabled.

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