LM4831 Datasheet | National Semiconductor

Description The LM4831 is a monolithic integrated circuit that provides a stereo three input mixer, two stereo input analog multiplexer, a stereo line out and a dual 1W bridged audio power amplifier. In addition, a low noise microphone preamp is included on-chip. The LM4831 is ideal for multimedia puters since it incorporates an input mixer, analog multiplexer, and configurable stereo audio power amplifier, as well as a microphone preamp stage. This bination allows for all of the analog audio processing to be enclosed in a 44-pin TQFP package. The LM4831 features an externally controlled, low-power consumption shutdown mode, as well as both headphone and docking station modes. To temporarily override the shutdown mode and allow audio signals to be amplified, the LM4831 provides four “beep” pins. Key Specifications n THD+N at 1W into 8Ω n Microphone Input Referred Noise n Supply Current - Bridged Mode n Shutdown Current 0.6% (typ) 10µV (typ) 16m A (typ) 2µA (typ) Features Stereo 1W audio power amplifier “Click and pop” suppression circuitry Stereo three input mixer Shutdown mode Multiple operating modes - bridged, single-ended and docking station modes n Internal mux for switching in/out external filter n Beep circuitry for “wake-up” while in shutdown n 44 Pin TQFP Packaging n n n n n Applications n Portable and Desktop puters Block Diagram Connection Diagram DS100057-1 FIGURE 1. LM4831 Block Diagram DS100057-3 Top View Order Number LM4831VF See NS Package Number VEJ44A Boomer ® is a registered trademark of National Semiconductor Corporation. TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100057 .national. Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 3) ESD...