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LM4949 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM4949 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 40 page  LM4949 Stereo Class D Audio Subsystem with OCL Headphone Amplifier General Description The LM4949 is a fully integrated audio subsystem designed for stereo cell phone applications. The LM4949 combines a 2.5W stereo Class D amplifier plus a separate 190mW ste- reo headphone amplifier, volume control, and input mixer into a single device. The filterless class D amplifiers deliver 1.19W/channel into an 8 Ω load with <1% THD+N from a 5V supply. The headphone amplifier features National’s Output Capacitor-less (OCL) architecture that eliminates the output coupling capacitors required by traditional headphone ampli- fiers. Additionally, the headphone amplifiers can be config- ured with capacitively coupled (CC)loads, or used to drive an external headphone amplifier. When configured for an exter- nal amplifier, the V DD/2 output (VOC) controls the external amplifier’s shutdown input. For improved noise immunity, the LM4949 features fully differential left, right and mono inputs. The three inputs can be mixed/multiplexed to either the speaker or headphone amplifiers. The left and right inputs can be used as separate single-ended inputs, mixing multiple stereo audio sources. The mixer, volume control, and device mode select are controlled through an I 2C compatible interface. Output short circuit and thermal shutdown protection prevent the device from being damaged during fault conditions. Su- perior click and pop suppression eliminates audible tran- sients on power-up/down and during shutdown. Key Specifications j Efficiency VDD = 3.6V, 400mW into 8 Ω 86.5% j Efficiency VDD = 5V, 1W into 8 Ω 87.4% j Quiescent Power Supply Current @ 3.6V 9.36mA j Power Output at VDD =5V Speaker: R L =4 Ω, THD+N ≤ 1% R L =8 Ω, THD+N ≤ 1% R L =4 Ω, THD+N ≤ 10% 2W 1.19W 2.5W Headphone: R L =16 Ω, THD+N ≤ 1% R L =32 Ω, THD+N ≤ 1% 153mW 89mW j Shutdown Current 0.1µA Features n Output Short Circuit Protection n Thermal Shutdown n Stereo filterless Class D operation n Selectable OCL/CC Headphone Drivers n RF Suppression n I 2C Control Interface n 32-step digital volume control n Independent Speaker and Headphone Gain Settings n Minimum external components n Click and Pop suppression n Micro-power shutdown n Available in space-saving 25 bump µSMD package Applications n Mobile phones n PDAs n Laptops Boomer® is a registered trademark of National Semiconductor Corporation. September 2006 © 2006 National Semiconductor Corporation DS202001 www.national.com |
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