LM4834

LM4834 1.75W Audio Power Amplifier with DC Volume Control and Microphone Preamp November 1997 LM4834 1.75W Audio Power Amplifier with DC Volume Control and Microphone Preamp General Description The LM4834 is a monolithic integrated circuit that provides DC volume control, and a bridged audio power amplifier capable of producing 1.75W into 4Ω with less than 1.0% (THD). In addition, the headphone/lineout amplifier is capable of driving 70 mW into 32Ω with less than 0.1%(THD). The LM4834 incorporates a volume control and an input microphone preamp stage capable of driving a 1 kΩ load impedance. Boomer ® audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external components in surface mount packaging. The LM4834 incorporates a DC volume control, a bridged audio power amplifier and a microphone preamp stage, making it optimally suited for multimedia monitors and desktop computer applications. The LM4834 features an externally controlled, low-power consumption shutdown mode, and both a power amplifier and headphone mute for maximum system flexibility and performance. Key Specifications n THD at 1.1W continuous average output power into 8Ω at 1 kHz n Output Power into 4Ω at 1.0% THD+N n THD at 70mW continuous average output power into 32Ω at 1 kHz n Shutdown Current n Supply Current 0.5%(max) 1.75W(typ) 0.1%(typ) 1.0µA(max) 17.5mA(typ) Features n PC98 Compliant n “Click and Pop” suppression circuitry n Stereo li...