LM4756 Datasheet, PDF (1/17 Pages) National Semiconductor (TI) – 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 Output power into 4Ω or 8Ω at 10% THD
n Maximum operating voltage
n Power output stage Noise floor
n Line output Noise floor
n 0V–5V DC controlled volume attenuation
n Mute attenuation
n Standby-mode supply current
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 Audio amplifier for stereo TVs
n Audio amplifier component stereo
n Audio amplifier compact stereo
7W (typ)
28V (max)
2mV (typ)
55µV (typ)
80dB (typ)
75dB (typ)
7mA (typ)
Connection Diagrams
Plastic Package
Plastic Package
20064433
Top View
Order Number LM4756TA
See NS Package Number TA15A
90 Degree Lead Bend
Order Number LM4756TA Spec. LB10
See NS Package Number TA15D
© 2003 National Semiconductor Corporation DS200644
20064444
Top View
U - Wafer Fab Code
Z - Assembly Plant Code
XY - Date Code
TT - Die Traceability
LM4756TA - LM4756TA
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