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 8
load and a stereo headphone amplifier
delivering 33mW per channel into a 32
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 I
2
C 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 28lead LLP package.
Key Specifications
j
P
OUT
, Stereo Loudspeakers, 4
, 5V,
1% THD+N (LM4859SP)
1.6W (typ)
j
P
OUT
, Stereo Loudspeakers, 8
, 5V,
1% THD+N
1.2W (typ)
j
P
OUT
, Stereo Headphones, 32
, 5V,
1% THD+N
75mW (typ)
j
P
OUT
, Stereo Loudspeakers, 8
, 3.3V,
1% THD+N
495mW (typ)
j
P
OUT
, Stereo Headphones, 32
, 3.3V,
1% THD+N
33mW (typ)
j
Shutdown Current
0.06A (typ)
Features
n
Stereo speaker amplifier
n
Stereo headphone amplifier
n
Independent Left, Right, and Mono volume controls
n
National 3D enhancement
n
I
2
C 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.
November 2004
LM4859
Stereo
1.2W
Audio
Sub-system
with
3D
Enhancement
2004 National Semiconductor Corporation
DS201061
www.national.com
Pin Connection (ITL)
Pin
Name
Pin Description
A1
RLS+
Right Loudspeaker Positive Output
A2
V
DD
Power Supply
A3
SDA
Data
A4
RHP3D
Right Headphone 3D
A5
RHP
Right Headphone Output
B1
GND
Ground
B2
I
2
CV
DD
I
2
C Interface Power Supply
B3
ADR
I
2
C Address Select
B4
LHP3D
Left Headphone 3D
B5
V
DD
Power Supply
C1
RLS-
Right Loudspeaker Negative Output
C2
NC
No Connect
C3
SCL
Clock
C4
NC
No Connect
C5
GND
Ground
D1
LLS-
Left Loudspeaker Negative Output
D2
V
DD
Power Supply
D3
M
IN
Mono Input
D4
NC
No Connect
D5
NC
No Connect
E1
GND
Ground
E2
BYPASS
Half-supply bypass
E3
LLS3D
Left Loudspeaker 3D
E4
R
IN
Right Stereo Input
E5
NC
No Connect
F1
LLS+
Left Loudspeaker Positive Output
F2
V
DD
Power Supply
F3
RLS3D
Right Loudspeaker 3D
F4
L
IN
Left Stereo Input
F5
LHP
Left Headphone Output
LM4859
www.national.com
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