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LM4811 Dual 105mW Headphone Amplifier with Digital Volume Control and Shutdown Mode
December 2002
LM4811
Dual 105mW Headphone Amplifier with Digital Volume
Control and Shutdown Mode
General Description
The LM4811 is a dual audio power amplifier capable of
delivering 105mW per channel of continuous average power
into a 16Ω load with 0.1% (THD+N) from a 5V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4811 does not require
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems.
The LM4811 features a digital volume control that sets the
amplifier’s gain from +12dB to −33dB in 16 discrete steps
using a two−wire interface.
The unity-gain stable LM4811 also features an externally
controlled, active-high, micropower consumption shutdown
mode. It also has an internal thermal shutdown protection
mechanism.
Key Specifications
n
THD+N at 1kHz, 105mW continuous average output
power into 16Ω
0.1% (typ)
n
THD+N at 1kHz, 70mW continuous average power into
32Ω
0.1% (typ)
n
Shutdown Current
0.3µA (typ)
Features
n
n
n
n
n
Digital volume control range from +12dB to −33dB
LD and MSOP surface mount packaging
"Click and Pop" suppression circuitry
No bootstrap capacitors required
Low shutdown current
Applications
n
n
n
n
Cellular Phones
MP3, CD, DVD players
PDA’s
Portable electronics
Connection Diagrams
MSOP Package
LD Package
20006102
Top View
Order Number LM4811MM
See NS Package Number MUB10A
20006162
Top View
Order Number LM4811LD
See NS Package Number LDA10A
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation
DS200061
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LM4811
Typical Application
20006101
*Refer to the
Application Information
Section for information concerning proper selection of the input and output coupling capacitors.
FIGURE 1. Typical Audio Amplifier Application Circuit
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2
LM4811
Absolute Maximum Ratings
(Note 1)
Infrared (15 sec.)
Thermal Resistance
θ
JA
MUB10A
θ
JC
MUB10A
θ
JA
LDA10A (Note 7)
θ
JC
LDA10A (Note 7)
220˚C
194˚C/W
52˚C/W
63˚C/W
12˚C/W
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Storage Temperature
ESD Susceptibility (Note 3)
ESD Susceptibility Machine model
(Note 6)
Junction Temperature (T
J
)
Soldering Information
Small Outline Package
Vapor Phase (60 sec.)
215˚C
6.0V
−65˚C to +150˚C
2.5kV
200V
150˚C
Operating Ratings
Temperature Range
T
MIN
≤
T
A
≤
T
MAX
Supply Voltage
−40˚C
≤
T
A
≤
85˚C
2.0V
≤
V
CC
≤
5.5V
Electrical Characteristics
(Notes 1, 8)
The following specifications apply for V
DD
= 5V unless otherwise specified, limits apply to T
A
= 25˚C.
Symbol
Parameter
Conditions
LM4811
Typical
(Note 4)
V
DD
I
DD
I
SD
V
OS
P
O
Supply Voltage
Supply Current
Shutdown Current
Output Offset Voltage
Output Power
V
IN
= 0V, I
O
= 0A
V
IN
= 0V
V
IN
= 0V
0.1% THD+N; f = 1kHz
R
L
= 16Ω
R
L
= 32Ω
THD+N
Total Harmonic Distortion
P
O
= 50mW, R
L
= 32Ω
f = 20Hz to 20kHz
R
L
= 32Ω; f = 1kHz;
P
O
= 70mW
C
B
= 1.0µF, V
RIPPLE
= 100mV
PP
f = 217Hz
105
70
0.3
100
60
1.4
0.4
Input referred minimum gain
Input referred maximum gain
Digital Volume Stepsize
Stepsize Error
Channel−to−Channel Volume
Tracking Error
Shutdown Attenuation
All 16 discrete steps
All 16 discrete steps
All gain settings from
−33dB to +12dB
Shutdown mode active
−33
+12
3.0
mW
mW
%
dB
dB
V (min)
V (max)
dB
dB
dB
dB
dB
dB
1.3
0.3
4.0
50
Limit
(Note 5)
2.0
5.5
3.0
Units
(Limits)
V (min)
V (max)
mA
µA
mV
Crosstalk Channel Separation
PSRR
V
IH
V
IL
Power Supply Rejection Ratio
(CLOCK, UP/DN, SHUTDOWN)
Input Voltage High
(CLOCK, UP/DN, SHUTDOWN)
Input Voltage Low
Digital Volume Range
±
0.3
0.15
−100
3
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LM4811
Electrical Characteristics
(Notes 1, 8)
The following specifications apply for V
DD
= 3.3V unless otherwise specified, limits apply to T
A
= 25˚C.
Symbol
Parameter
Conditions
LM4811
Typical
(Note 4)
I
DD
I
SD
V
OS
P
o
Supply Current
Shutdown Current
Output Offset Voltage
Output Power
V
IN
= 0V, I
O
= 0A
V
IN
= 0V
V
IN
= 0V
0.1% THD+N; f = 1kHz
R
L
= 16Ω
R
L
= 32Ω
THD+N
PSRR
V
IH
V
IL
Total Harmonic Distortion
Power Supply Rejection Ratio
(CLOCK, UP/DN, SHUTDOWN)
Input Voltage High
(CLOCK, UP/DN, SHUTDOWN)
Input Voltage Low
Digital Volume Range
Digital Volume Stepsize
Stepsize Error
Channel−to−Channel Volume
Tracking Error
Shutdown Attenuation
Input referred minimum gain
Input referred maximum gain
All 16 discrete steps
All 16 discrete steps
All gain settings from
−33dB to +12dB
Shutdown mode active
P
O
= 25mW, R
L
= 32Ω
f = 20Hz to 20kHz
C
B
= 1.0µF, V
RIPPLE
= 100mV
PP
f = 217Hz
40
28
0.5
60
1.4
0.4
−33
+12
3.0
mW
mW
%
dB
V (min)
V (max)
dB
dB
dB
dB
dB
dB
1.1
0.3
4.0
Limit
(Note 5)
Units
(Limits)
mA
µA
mV
±
0.3
0.15
−100
Electrical Characteristics
(Notes 1, 8)
The following specifications apply for V
DD
= 2.6V unless otherwise specified, limits apply to T
A
= 25˚C.
Symbol
Parameter
Conditions
LM4811
Typical
(Note 4)
I
DD
I
SD
V
OS
P
o
Supply Current
Shutdown Current
Output Offset Voltage
Output Power
V
IN
= 0V, I
O
= 0A
V
IN
= 0V
V
IN
= 0V
0.1% THD+N; f = 1kHz
R
L
= 16Ω
R
L
= 32Ω
THD+N
PSRR
V
IH
V
IL
Total Harmonic Distortion
Power Supply Rejection Ratio
(CLOCK, UP/DN, SHUTDOWN)
Input Voltage High
(CLOCK, UP/DN, SHUTDOWN)
Input Voltage Low
Digital Volume Range
Digital Volume Stepsize
Stepsize Error
Channel−to−Channel Volume
Tracking Error
Input referred minimum gain
Input referred maximum gain
All 16 discrete steps
All 16 discrete steps
All gain settings from
−33dB to +12dB
P
O
= 15mW, R
L
= 32Ω
f = 20Hz to 20kHz
C
B
= 1.0µF, V
RIPPLE
= 100mV
PP
f = 217Hz
20
16
0.6
60
1.4
0.4
−33
+12
3.0
mW
mW
%
dB
V (min)
V (max)
dB
dB
dB
dB
dB
1.0
0.3
4.0
Limit
(Note 5)
Units
(Limits)
mA
µA
mV
±
0.3
0.15
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