LM4756

LM4756 Dual 7W Audio Power Amplifier w/Mute, Standby and Volume Control September 2003 LM4756 Dual 7W Audio Power Amplifier w/Mute, Standby and Volume Control General Description The LM4756 is a stereo audio amplifier capable of delivering 7W/channel at 10% distortion into a 4Ω or 8Ω load. The power amp has an internally set gain of 30dB. A 0V–5V DC controlled volume block provides 80dB of attenuation from input to line-out. Line outputs are available after the volume control for signal routing. The amplifier has a smooth transition fade-in/out mute and a power conserving standby function which are controlled through TTL or CMOS logic. Both functions provide over 75dB of attenuation. The LM4756 maintains an excellent Signal-to-Noise ratio of greater than 70dB with a low noise floor less than 2mV. The IC also maintains above 50dB of channel separation. The LM4756 is available in a 15-lead non-isolated plastic package and is designed for use in TV applications requiring single supply operation. Key Specifications n n n n n n n Output power into 4Ω or 8Ω at 10% THD Maximum operating voltage Power output stage Noise floor Line output Noise floor 0V–5V DC controlled volume attenuation Mute attenuation Standby-mode supply current 7W (typ) 28V (max) 2mV (typ) 55µV (typ) 80dB (typ) 75dB (typ) 7mA (typ) Features n n n n Quiet fade-in/out mute function Stereo variable line-out pins AC output short circuit protection Thermal shutdown protection Applications n Audio amplifier for st...