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LM49150 Datasheet(PDF) 1 Page - Texas Instruments |
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LM49150 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 31 page LM49150, LM49150TLEVAL www.ti.com SNAS439C – AUGUST 2008 – REVISED MAY 2013 LM49150 Mono Class D Audio Subsystem with Earpiece Driver and Stereo Ground Referenced Headphone Amplifiers Check for Samples: LM49150, LM49150TLEVAL 1 FEATURES APPLICATIONS 23 • E2S Class D Amplifier • Mobile Phones • Ground Referenced Headphone Outputs — • PDAs Eliminates Output Coupling Capacitors • Portable Electronics • I2C Volume and Mode Control DESCRIPTION • Mono Earpiece Amplifier The LM49150 is a fully integrated audio subsystem • Flexible Output for Speaker and Headphone designed for portable handheld applications such as Output cellular phones. Part of TI's PowerWise™ product • 20–Bump DSBGA Package family, the LM49150 consumes very low power in the various modes of operation and still providing great • Soft Enable Function audio performance. The LM49150 combines a 1.25W • “Click and Pop” Suppression Circuitry mono E2S (Enhanced Emission Suppression) class D • Thermal Shutdown Protection amplifier, 135mW Class AB earpiece amplifier, • Low Supply Current 42mW/channel stereo ground reference headphone amplifiers, volume control, and mixing circuitry into a • Micro-Power Shutdown single device. KEY SPECIFICATIONS The filterless class D amplifier delivers 1.25W into an 8 Ω load with <1% THD+N with a 5V supply. The E2S • Output power at VDD = 5V: class D amplifier features a patented, ultra low EMI – Speaker: RL = 8Ω BTL, THD+N ≤ 1%: 1.25W PWM architecture that significantly reduces RF (typ) emissions while preserving audio quality. The 42mW/channel headphone drivers feature TI’s – Headphone: RL = 32Ω SE, THD+N ≤ 1%: ground referenced architecture that creates a ground- 42mW (typ) referenced output from a single supply, eliminating – Earpiece: RL = 8Ω SE, THD+N ≤ 1%: 135mW the need for bulky and expensive DC-blocking (typ) capacitors, saving space and minimizing cost. • Output power at VDD = 3.3V: The LM49150 features a fully differential mono input, – Speaker: RL = 8Ω BTL, THD+N ≤ 1%: and two single-ended stereo inputs. The three inputs 520mW (typ) can be mixed/multiplexed to either the speaker or headphone amplifiers. Each input channel has an – Headphone: RL = 32Ω BTL, THD+N ≤ 1%: independent, 32-step digital volume control. The 42mW (typ) headphone output stage features an additional, 8- – Earpiece: RL = 8Ω SE, THD+N ≤ 1%: 35mW step gain control, while the speaker output stage has (typ) a selectable 6dB or 12dB gain. The mixer, volume • Output Offset control and device mode select are controlled through an I2C compatible serial interface. – LS Mode: 9mV (typ) – HP Mode: 1mV (typ) The LM49150’s superior click and pop suppression eliminates audible transients on power-up/down and – Earpiece: 1mV (typ) during shutdown. The LM49150 is available in a ultra- • Single Supply Operation (VDD): 2.7 to 5.5V small 20-bump DSBGA package (2.225mm X • I2C Single Supply Operation: 1.7 to 5.5V 2.644mm). 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 PowerWise is a trademark of Texas Instruments. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2008–2013, 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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