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LM4947 Folha de dados(PDF) 1 Page - Texas Instruments |
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LM4947 Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 37 page LM4947, LM4947TLEVAL www.ti.com SNAS349C – JUNE 2006 – REVISED NOVEMBER 2007 LM4947 Mono Class D and Stereo Audio Sub-System with OCL Headphone Amplifier and National 3D Check for Samples: LM4947, LM4947TLEVAL 1 FEATURES 2 • I2C Control Interface • Thermal shutdown protection • I2C programmable National 3D Audio • Low shutdown current (0.1 μA, typ) • I2C controlled 32 step digital volume control (- • RF suppression 59.5dB to +18dB) • Differential mono and stereo inputs • Three independent volume channels (Left, • Stereo input mux Right, Mono) • Eight distinct output modes APPLICATIONS • Small, 25–bump micro SMD packaging • Mobile Phones • “Click and Pop” suppression circuitry • PDAs DESCRIPTION The LM4947 is an audio subsystem capable of efficiently delivering 500mW (Class D operation) of continuous average power into a mono 8 Ω bridged-tied load (BTL) with 1% THD+N, 37mW (Class AB operation) power channel of continuous average power into stereo 32 Ω single-ended (SE) loads with 1% THD+N, or an output capacitor-less (OCL) configuration with identical specification as the SE configuration, from a 3.3V power supply. The LM4947 has six input channels: one pair for a two-channel stereo signal, the second pair for a secondary two-channel stereo input, and the third pair for a differential single-channel mono input. Additionally, the two sets of stereo inputs may be configured as a single stereo differential input (differential left and differential right). The LM4947 features a 32-step digital volume control and eight distinct output modes. The digital volume control, 3D enhancement, and output modes are programmed through a two-wire I2C compatible interface that allows flexibility in routing and mixing audio channels. The RF suppression circuitry in the LM4947 makes it well-suited for GSM mobile phones and other portable applications in which strong RF signals generated by an antenna (and long output traces) may couple audibly into the amplifier. The LM4947 is designed for cellular phones, PDAs, and other portable handheld applications. It delivers high quality output power from a surface-mount package and requires only eight external components in the OCL mode (two additional components in SE mode). Table 1. Key Specifications VALUE UNIT THD+N at 1kHz, 500mW into 8 Ω BTL (3.3V) 1.0% (typ) THD+N at 1kHz, 37mW into 32 Ω SE (3.3V) 1.0% (typ) Single Supply Operation (VDD) 2.7 to 5.5 V I2C Single Supply Operation 2.2 to 5.5 V 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. |
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