LM4946

LM4946 www.ti.com SNAS335E – JANUARY 2006 – REVISED AUGUST 2007 LM4946 Output Capacitor-Less Audio Subsystem with Programmable TI 3D Check for Samples: LM4946 FEATURES 1 2 I2C/SPI Control Interface I2C/SPI Programmable TI 3D Audio I2C/SPI Controlled 32 Step Digital Volume Control (-54dB to +18dB) Three Independent Volume Channels (Left, Right, Mono) Eight Distinct Output Modes WQFN and DSBGA Surface Mount Packaging “Click and Pop” Suppression Circuitry Thermal Shutdown Protection Low Shutdown Current (0.02uA, typ) RF Immunity Topology APPLICATIONS Mobile Phones PDAs KEY SPECIFICATIONS THD+N at 1kHz, 540mW into 8Ω BTL (3.3V) 1.0% (typ) THD+N at 1kHz, 35mW into 32Ω SE (3.3V) 1.0% (typ) Single Supply Operation (VDD) 2.7 to 5.5V I2C/SPI Single Supply Operation – WQFN 2.2 to 5.5V – DSBGA 1.7 to 5.5V DESCRIPTION The LM4946 is an audio power amplifier capable of delivering 540mW of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N, 35mW per channel of continuous average power into stereo 32Ω single-ended (SE) loads with 1% THD+N, or an output capacitor-less (OCL) configuration with identical specifications as the SE configuration, from a 3.3V power supply. The LM4946 has three input channels: one pair for a two-channel stereo signal and the third for a differential single-channel mono input. The LM4946 features a 32-step digital volume control and eight distinct output modes. The digital volume control, 3D enhancement,...