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LM4941 Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części LM4941
Szczegółowy opis  1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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LM4941 Arkusz danych(HTML) 1 Page - Texas Instruments

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LM4941, LM4941SDBD, LM4941TMBD
www.ti.com
SNAS347C – JUNE 2006 – REVISED MAY 2013
LM4941
1.25 Watt Fully Differential Audio Power Amplifier
With RF Suppression and Shutdown
Check for Samples: LM4941, LM4941SDBD, LM4941TMBD
1
FEATURES
DESCRIPTION
The LM4941 is a fully differential audio power
2
Improved RF Suppression, By Up to 20dB
amplifier
primarily
designed
for
demanding
Over Previous Designs in Selected
applications in mobile phones and other portable
Applications
communication device applications. It is capable of
Fully Differential Amplification
delivering 1.25 watts of continuous average power to
a 8
Ω load with less than 1% distortion (THD+N) from
Available in Space-Saving DSBGA Package
a 5VDC power supply. The LM4941 does not require
Ultra Low Current Shutdown Mode
output coupling capacitors or bootstrap capacitors,
Can Drive Capacitive Loads up to 100pF
and therefore is ideally suited for mobile phone and
Improved Pop & Click Circuitry Eliminates
other small form factor applications where minimal
PCB space is a primary requirement.
Noises During Turn-On and Turn-Off
Transitions
The
LM4941
also
features
proprietary
internal
2.4 - 5.5V Operation
circuitry that suppresses the coupling of RF signals
into the chip. This is important because certain types
No Output Coupling Capacitors, Snubber
of RF signals (such as GSM) can couple into audio
Networks or Bootstrap Capacitors Required
amplifiers in such a way that part of the signal is
heard through the speaker. The RF suppression
APPLICATIONS
circuitry in the LM4941 makes it well-suited for
Mobile Phones
portable applications in which strong RF signals
generated by an antenna from or a cellular phone or
PDAs
other portable electronic device may couple audibly
Portable Electronic Devices
into the amplifier.
Other features include a low-power consumption
KEY SPECIFICATIONS
shutdown
mode,
internal
thermal
shutdown
Improved PSRR at 217Hz 95dB (typ)
protection, and advanced pop & click circuitry.
Power Output, VDD = 5.0V, RL = 8Ω, 1% THD+N
1.25W (typ)
Power Output, VDD = 3.0V, RL = 8Ω, 1% THD+N
430mW (typ)
Shutdown Current 0.1µA (typ)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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