描述 Description

The LM4855 is an audio power amplifier system capable of delivering 1.1W (typ) of continuous average power into a mono 8? bridged-tied load (BTL) with 1% THD+N and 115mW (typ) per channel of continuous average power into stereo 32? BTL loads with 0.5% THD+N, using a 5V power supply. The LM4855 features a 32 step digital volume control and eight distinct output modes. The digital volume control and output modes are programmed through a three-wire SPI serial control interface, that allows flexibility in routing and mixing audio channels.The LM4855 is designed for cellular phone, PDA, and other portable handheld applications. It delivers high quality output power from a surface-mount package and requires only six external components.The industry leading DSBGA package only utilizes 2mm x 2.3mm of PCB space, making the LM4855 the most space efficient audio sub system available today.

特性 Features

? 1.1W (Typ) Output Power with 8? Mono BTL Load
? 115mW (Typ) Output Power with Stereo 32? BTL Loads
? SPI Programmable 32 Step Digital Volume Control
? Eight Distinct Output Modes
? DSBGA and WQFN Surface Mount Packaging
? \"Click and Pop\" Suppression Circuitry
? Thermal Shutdown Protection
? Low Shutdown Current (0.1uA, Typ)
Key Specifications
? THD+N at 1kHz, 1.1W into 8Ω BTL: 1.0% (Typ)
? THD+N at 1kHz, 115mW into 32Ω BTL: 0.5% (Typ)
? Single Supply Operation: 2.6 to 5.0V