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LM4947TLEVAL 데이터시트(PDF) 1 Page - Texas Instruments |
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1 / 37 page LM4947, LM4947TLEVAL www.ti.com SNAS349D – JUNE 2006 – REVISED MAY 2013 LM4947 Mono Class D and Stereo Audio Sub-System with OCL Headphone Amplifier and TI 3D Check for Samples: LM4947, LM4947TLEVAL 1 FEATURES DESCRIPTION The LM4947 is an audio subsystem capable of 2 • I2C Control Interface efficiently delivering 500mW (Class D operation) of • I2C Programmable Texas Instruments 3D continuous average power into a mono 8 Ω bridged- Audio tied load (BTL) with 1% THD+N, 37mW (Class AB • I2C Controlled 32 Step Digital Volume Control operation) power channel of continuous average power into stereo 32 Ω single-ended (SE) loads with (-59.5dB to +18dB) 1% THD+N, or an output capacitor-less (OCL) • Three Independent Volume Channels (Left, configuration with identical specification as the SE Right, Mono) configuration, from a 3.3V power supply. • Eight Distinct Output Modes The LM4947 has six input channels: one pair for a • Small, 25–Bump DSBGA Packaging two-channel stereo signal, the second pair for a • “Click and Pop” Suppression Circuitry secondary two-channel stereo input, and the third pair for a differential single-channel mono input. • Thermal Shutdown Protection Additionally, the two sets of stereo inputs may be • Low Shutdown Current (0.1 μA, typ) configured as a single stereo differential input • RF Suppression (differential left and differential right). The LM4947 features a 32-step digital volume control and eight • Differential Mono and Stereo Inputs distinct output modes. The digital volume control, 3D • Stereo Input Mux enhancement, and output modes are programmed through a two-wire I2C compatible interface that KEY SPECIFICATIONS allows flexibility in routing and mixing audio channels. • THD+N at 1kHz, 500mW into 8 Ω BTL (3.3V): The RF suppression circuitry in the LM4947 makes it 1.0% (typ) well-suited for GSM mobile phones and other • THD+N at 1kHz, 37mW into 32 Ω SE (3.3V): portable applications in which strong RF signals 1.0% (typ) generated by an antenna (and long output traces) may couple audibly into the amplifier. • Single Supply Operation (VDD): 2.7 to 5.5 V The LM4947 is designed for cellular phones, PDAs, • I2C Single Supply Operation: 2.2 to 5.5 V and other portable handheld applications. It delivers high quality output power from a surface-mount APPLICATIONS package and requires only eight external components • Mobile Phones in the OCL mode (two additional components in SE mode). • PDAs 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 © 2006–2013, 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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