LM4753

Dual 10W Audio Power Amplifier w/Mute, Standby and

Volume Control

General Description

The LM4753 is a stereo audio amplifier capable of delivering

10W/channel at 10% distortion into a 8

Ω load. The power

amp has an internally set gain of 30 dB. A 0V–5V DC con-

trolled volume block provides 80 dB of attenuation from input

to line-out. Line outputs are available after the volume con-

trol 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

75 dB of attenuation.

The LM4753 maintains an excellent Signal-to-Noise ratio of

greater than 70 dB with a low noise floor less than 2 mV. The

IC also maintains above 50 dB of channel separation.

The LM4753 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 Output power into 8

Ω at 10% THD 10W

n Maximum operating voltage

28V

n Power output stage Noise floor

2 mV

n Line output Noise floor

55 µV

n 0V–5V DC controlled volume attenuation

80 dB

n Mute attenuation

75 dB

n Standby-mode supply current

7 mA

Features

n Quiet fade-in/out mute function

n Stereo variable line-out pins

n AC output short circuit protection

n Thermal shutdown protection

Applications

n Stereo TVs

n Component stereo

n Compact stereo

Typical Application

DS100043-1

FIGURE 1. Typical Audio Amplifier Application Circuit

June 1999

© 1999 National Semiconductor Corporation

DS100043

www.national.com