LM4831VF National Semiconductor, LM4831VF Datasheet - Page 7

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

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

Pin Descriptions
Typical Performance Characteristic
Supply Current vs
Supply Voltage
THD+N vs Frequency
MIC+IN
MIC−IN
MIC OUT
This pin is the positive input of the
microphone amplifier. The microphone
amplifier is typically configured as an
inverting amplifier, so this pin should
be connected to the BYPASS pin to
properly bias the amplifier. Further,
this pin should be individually
bypassed with a capacitor of
0.01µF–0.1 µF.
This pin is the inverting input for the
microphone amplifier. Because the
microphone amplifier is typically used
as an inverting amplifier, this pin
should be capacitor coupled to the
input signal.
This pin is the microphone amplifier
output. If this pin is to be connected to
any chips other than the LM4831, it
should be capacitor coupled to the
load.
(Continued)
DS100057-5
DS100057-31
THD+N vs Frequency
Power Derating Curve
7
BEEP A,
BEEP B,
BEEP C,
BEEP D
BEEP OUT
RC
DS100057-4
These four pins are used to “wake up”
the LM4831 for a specified amount of
time (dictated by the parallel resistor
and capacitor connected to the RC
pin). If the device is in shutdown and
an edge appears at any of the four
BEEP pins, then the device will
power-up, pass the sound, and then
power-down again.
This pin outputs the result of an
exclusive-or of the four BEEP inputs.
BEEP OUT connects back to the
Audio Codec as a status pin.
This pin is connected to an external
resistor-capacitor network which sets
the on-time for a beep request.
Typically, a 0.1µF capacitor is
paralleled with a 1–10M
THD+N vs Frequency
DS100057-23
resistor.
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DS100057-29