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LM4947 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4947 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 32 page  LM4947 Mono Class D and Stereo Audio Subsystem with OCL Headphone Amplifier and National 3D General Description The LM4947 is an audio subsystem capable of efficiently delivering 500mW (Class D operation) of continuous aver- age power into a mono 8 Ω bridged-tied load (BTL) with 1% THD+N, 37mW (Class AB operation) power channel of con- tinuous 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 configu- ration, 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 ste- reo 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 I 2C compatible interface that allows flexibility in routing and mix- ing audio channels. The RF suppression circuitry in the LM4947 makes it well- suited for GSM mobile phones and other portable applica- tions in which strong RF signals generated by an antenna (and long output traces) may couple audibly into the ampli- fier. 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 addi- tional components in SE mode). Key Specifications j THD+N at 1kHz, 500mW into 8 Ω BTL (3.3V) 1.0% (typ) j THD+N at 1kHz, 37mW into 32 Ω SE (3.3V) 1.0% (typ) j Single Supply Operation (VDD) 2.7 to 5.5V j I 2C Single Supply Operation 2.2 to 5.5V Features n I 2C Control Interface n I 2C programmable National 3D Audio n I 2C controlled 32 step digital volume control (-59.5dB to +18dB) n Three independent volume channels (Left, Right, Mono) n Eight distinct output modes n Small, 25–bump micro SMD packaging n “Click and Pop” suppression circuitry n Thermal shutdown protection n Low shutdown current (0.1µA, typ) n RF suppression n Differential mono and stereo inputs n Stereo input mux Applications n Mobile Phones n PDAs Boomer® is a registered trademark of National Semiconductor Corporation. October 2006 © 2006 National Semiconductor Corporation DS201735 www.national.com |
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