LM4859 Datasheet, PDF (1/29 Pages) National Semiconductor (TI) – Stereo 1.2W Audio Sub-system with 3D Enhancement

November 2004
LM4859
Stereo 1.2W Audio Sub-system with 3D Enhancement
General Description
The LM4859 is an integrated audio sub-system designed for
stereo cell phone applications. Operating on a 3.3V supply, it
combines a stereo speaker amplifier delivering 495mW per
channel into an 8Ω load and a stereo headphone amplifier
delivering 33mW per channel into a 32Ω load. It integrates
the audio amplifiers, volume control, mixer, power manage-
ment control, and National 3D enhancement all into a single
package. In addition, the LM4859 routes and mixes the
stereo and mono inputs into 10 distinct output modes. The
LM4859 is controlled through an I²C compatible interface.
Other features include an ultra-low current shutdown mode
and thermal shutdown protection.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components.
The LM4859 is available in a 28–lead LLP package.
Key Specifications
j P_OUT, Stereo Loudspeakers, 4Ω, 5V,
1% THD+N (LM4859SP)
j P_OUT, Stereo Loudspeakers, 8Ω, 5V,
1% THD+N
j P_OUT, Stereo Headphones, 32Ω, 5V,
1% THD+N
j P_OUT, Stereo Loudspeakers, 8Ω, 3.3V,
1% THD+N
j P_OUT, Stereo Headphones, 32Ω, 3.3V,
1% THD+N
j Shutdown Current
1.6W (typ)
1.2W (typ)
75mW (typ)
495mW (typ)
33mW (typ)
0.06µA (typ)
Features
n Stereo speaker amplifier
n Stereo headphone amplifier
n Independent Left, Right, and Mono volume controls
n National 3D enhancement
n I²C compatible interface
n Ultra low shutdown current
n Click and Pop Suppression circuit
n 10 distinct output modes
n Thermal Shutdown Protection
n Available in an LLP package
Applications
n Cell Phones
n PDAs
n Portable Gaming Devices
n Internet Appliances
n Portable DVD/CD/AAC/MP3 players
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS201061
www.national.com