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LM4941 Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM4941 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 21 page 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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