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 16 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
16 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.
May 2004
LM4859
Stereo
1.2W
Audio
Sub-system
with
3D
Enhancement
2004 National Semiconductor Corporation
DS201061
www.national.com
Pin Connection (SP)
Pin
Name
Pin Description
1
RHP
Right Headphone Output
2
V
DD
Power Supply
3
NC
No Connect
4
GND
Ground
5
NC
No Connect
6
NC
No Connect
7
LHP
Left Headphone Output
8
RIN
Right Stereo Input
9
LIN
Left Stereo Input
10
MIN
Mono Input
11
LLS3D
Left Loudspeaker 3D
12
RLS3D
Right Loudspeaker 3D
13
BYPASS
Half-supply bypass
14
V
DD
Power Supply
15
LLS+
Left Loudspeaker Positive Output
16
GND
Ground
17
LLS-
Leftt Loudspeaker Negative Output
18
V
DD
Power Supply
19
RLS-
Right Loudspeaker Negative Output
20
GND
Ground
21
RLS+
Right Loudspeaker Positive Output
22
V
DD
Power Supply
23
I
2
CV
DD
I
2
C Interface Power Supply
24
SDA
Data
25
ADR
I
2
C Address Select
26
SCL
Clock
27
RHP3D
Right Headphone 3D
28
LHP3D
Left Headphone 3D
LM4859
www.national.com
4
Absolute Maximum Ratings
(Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
6.0V
Storage Temperature
-65C to +150C
Input Voltage
-0.3V to V
DD
+0.3V
Power Dissipation (Note 3)
Internally Limited
ESD Susceptibility (Note 4)
2000V
ESD Susceptibility (Note 5)
200V
Junction Temperature (T
J
)
150C
Thermal Resistance
JA
(SPA28A) (Note 10)
42C/W
JC
(SPA28A)
3C/W
Operating Ratings
Temperature Range
T
MIN
T
A
T
MAX
-40C
T
A
+85C
Supply Voltage
2.7V
V
DD
5.5V
2.5V
I
2
CV
DD
5.5V
Audio Amplifier Electrical Characteristics V
DD
= 5.0V
(Notes 1, 2)
The following specifications apply for V
DD
= 5.0V, unless otherwise specified. Limits apply for T
A
= 25C.
Symbol
Parameter
Conditions
LM4859
Units
(Limits)
Typical
(Note 6)
Limits (Notes
7, 8)
I
DD
Supply Current
V
IN
= 0V, No load;
LD5 = RD5 = 0 (Note 9)
Mode 4
5
8
mA (max)
Mode 2, 3, 7, 8, 12, 13
13
21
mA (max)
I
SD
Shutdown Current
Output mode 0 (Note 9)
0.2
3
A (max)
P
O
Output Power
LM4859SP
Speaker; THD+N = 1%;
f = 1kHz; 4
BTL
1.6
W
Speaker; THD+N = 1%;
f = 1kHz; 8
BTL
1.2
0.9
W (min)
Headphone; THD+N = 1%;
f = 1kHz; 32
SE
75
60
mW (min)
THD+N
Total Harmonic Distortion Plus
Noise
LD5 = RD5 = 0
Speaker; P
O
= 400mW;
f = 1kHz; 8
BTL
0.05
%
Headphone; P
O
= 15mW;
f = 1kHz; 32
SE
0.04
%
V
OS
Offset Voltage
Speaker; LD5 = RD5 = 0
5
40
mV (max)
N
OUT
Output Noise
A-weighted, 0dB gain; (Note 11)
LD5 = RD5 = 0; Audio Inputs Terminated
Speaker; Mode 2, 3, 7, 8
27
V
Speaker; Mode 12, 13
38
V
Headphone; Mode 3, 4, 8, 9
10
V
Headphone; Mode 13, 14
14
V
PSRR
Power Supply Rejection Ratio
f = 217Hz; V
rip
= 200mV
pp
; C
B
= 2.2F;
0dB gain; (Note 11)
LD5 = RD5 = 0; Audio Inputs Terminated
Speaker; Mode 2, 3, 7, 8
70
dB
Speaker; Mode 12, 13,
64
54
dB (min)
Headphone; Mode 3, 4, 8, 9
86
dB
Headphone; Mode 13, 14
73
60
dB (min)
LM4859
www.national.com
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