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LM49251 Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM49251 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 41 page LM49251 www.ti.com SNAS498A – FEBRUARY 2011 – REVISED APRIL 2013 LM49251 Stereo Audio Subsystem with Class G Headphone Amplifier and Class D Speaker Amplifier with Speaker Protection Check for Samples: LM49251 1 FEATURES DESCRIPTION The LM49251 is a fully integrated audio subsystem 2 • Class G Ground Referenced Headphone designed for portable handheld applications such as Outputs cellular phones. Part of TI’s PowerWise family of • E2S Class D Amplifier products, the LM49251 utilizes a high efficiency class • No Clip Function G headphone amplifier topology as well as a high efficiency class D loudspeaker. • Power Limiter Speaker Protection The headphone amplifiers feature TI’s class G ground • I2C Volume and Mode Control referenced architecture that creates a ground- • Advanced Click-and-Pop Suppression referenced output with dynamic supply rails for • Micro-Power Shutdown optimum efficiency. The stereo class D speaker amplifier provides both a no-clip feature and speaker APPLICATIONS protection. The Enhanced Emission Suppression (E2S) outputs feature a patented, ultra low EMI PWM • Feature Phones architecture that significantly reduces RF emissions. • Smart Phones The LM49251 features separate volume controls for the mono and stereo inputs. Mode selection, KEY SPECIFICATIONS shutdown control, and volume are controlled through • Class G Headphone Amplifier, HPVDD = 1.8V, an I2C compatible interface. RL = 32Ω Click and pop suppression eliminates audible – IDDQHP: 1.15 mA (Typ) transients on power-up/down and during shutdown. – Output Power, THD+N ≤ 1%: 20 mW (Typ) The LM49251 is available in an ultra-small 30-bump DSBGA package (2.55mmx3.02mm) • Stereo Class D Speaker Amplifier RL = 8Ω – Output Power, THD+N ≤ 1%, LSVDD = 5.0V: 1.37 W (Typ) – Output Power, THD+N ≤ 1%, LSVDD = 3.6V: 680 mW (Typ) – Efficiency: 90% (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 © 2011–2013, 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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