PDF LM4941 Data sheet ( Hoja de datos )

Número de pieza	LM4941
Descripción	1.25 Watt Fully Differential Audio Power Amplifier
Fabricantes	National Semiconductor
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No Preview Available ! www.DataSheet4U.com June 2006 LM4941 1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown General Description The LM4941 is a fully differential audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applica- tions. It is capable of delivering 1.25 watts of continuous average power to a 8Ω 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 low voltage applications where minimal power consumption 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. Key Specifications j Improved PSRR at 217Hz j Power Output at 5.0V @ 1% THD (8Ω) j Power Output at 3.3V @ 1% THD j Shutdown Current 95dB (typ) 1.25W (typ) 550mW (typ) 0.1µA (typ) Features n Improved RF suppression, by up to 20dB over previous designs in selected applications n Fully differential amplification n Available in space-saving micro SMD package n Ultra low current shutdown mode n Can drive capacitive loads up to 100pF n Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions n 2.4 - 5.5V operation n No output coupling capacitors, snubber networks or bootstrap capacitors required Applications n Mobile phones n PDAs n Portable electronic devices Typical Application 20170303 FIGURE 1. Typical Audio Amplifier Application Circuit Boomer® is a registered trademark of National Semiconductor Corporation. © 2006 National Semiconductor Corporation DS201703 www.national.com 1 page Typical Performance Characteristics (Note 9) THD+N vs Output Power VDD = 5V, RL = 8Ω, f = 1kHz THD+N vs Output Power VDD = 3V, RL = 8Ω, f = 1kHz 20170305 THD+N vs Frequency VDD = 5V, RL = 8Ω, PO = 700mW 20170306 THD+N vs Frequency VDD = 3V, RL = 8Ω, PO = 250mW 20170307 PSRR vs Frequency VDD = 5V, RL = 8Ω, Inputs terminated 20170308 PSRR vs Frequency VDD = 3V, RL = 8Ω, Inputs terminated 20170309 5 20170310 www.national.com 5 Page Recommended TM Board Layout 20170321 Recommended TM Board Layout: Top Layer 20170322 Recommended TM Board Layout: Top Overlay 20170320 Recommended TM Board Layout: Bottom Layer 11 www.national.com 11 Page

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