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LM4941 データシート(PDF) 1 Page - Texas Instruments |
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LM4941 データシート(HTML) 1 Page - Texas Instruments |
1 / 23 page LM4941, LM4941SDBD, LM4941TMBD www.ti.com SNAS347B – JUNE 2006 – REVISED MARCH 2007 LM4941 1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown Check for Samples: LM4941, LM4941SDBD, LM4941TMBD 1 FEATURES • No output coupling capacitors, snubber networks or bootstrap capacitors required 2 • Improved RF suppression, by up to 20dB over previous designs in selected applications APPLICATIONS • Fully differential amplification • Mobile phones • Available in space-saving micro SMD package • PDAs • Ultra low current shutdown mode • Portable electronic devices • Can drive capacitive loads up to 100pF • Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions • 2.4 - 5.5V operation DESCRIPTION The LM4941 is a fully differential audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1.25 watts of continuous average power to a 8 Ω load with less than 1% distortion (THD+N) from a 5VDC power supply. The LM4941 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other small form factor applications where minimal PCB space is a primary requirement. The LM4941 also features proprietary internal circuitry that suppresses the coupling of RF signals into the chip. This is important because certain types of RF signals (such as GSM) can couple into audio amplifiers in such a way that part of the signal is heard through the speaker. The RF suppression circuitry in the LM4941 makes it well-suited for portable applications in which strong RF signals generated by an antenna from or a cellular phone or other portable electronic device may couple audibly into the amplifier. Other features include a low-power consumption shutdown mode, internal thermal shutdown protection, and advanced pop & click circuitry. Table 1. Key Specifications VALUE UNIT ■ Improved PSRR at 217Hz 95 dB (typ) ■ Power Output, VDD = 5.0V, 1.25 W (typ) RL = 8Ω, 1% THD+N ■ Power Output, VDD = 3.0V, 430 mW (typ) RL = 8Ω, 1% THD+N ■ 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 © 2006–2007, 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. |
同様の部品番号 - LM4941_14 |
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同様の説明 - LM4941_14 |
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