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부품번호 | LM4949 기능 |
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기능 | Stereo Class D Audio Subsystem | ||
제조업체 | National Semiconductor | ||
로고 | |||
전체 40 페이지수
www.DataSheet4U.com
September 2006
LM4949
Stereo Class D Audio Subsystem with OCL Headphone
Amplifier
General Description
The LM4949 is a fully integrated audio subsystem designed
for stereo cell phone applications. The LM4949 combines a
2.5W stereo Class D amplifier plus a separate 190mW ste-
reo headphone amplifier, volume control, and input mixer
into a single device. The filterless class D amplifiers deliver
1.19W/channel into an 8Ω load with <1% THD+N from a 5V
supply. The headphone amplifier features National’s Output
Capacitor-less (OCL) architecture that eliminates the output
coupling capacitors required by traditional headphone ampli-
fiers. Additionally, the headphone amplifiers can be config-
ured with capacitively coupled (CC)loads, or used to drive an
external headphone amplifier. When configured for an exter-
nal amplifier, the VDD/2 output (VOC) controls the external
amplifier’s shutdown input.
For improved noise immunity, the LM4949 features fully
differential left, right and mono inputs. The three inputs can
be mixed/multiplexed to either the speaker or headphone
amplifiers. The left and right inputs can be used as separate
single-ended inputs, mixing multiple stereo audio sources.
The mixer, volume control, and device mode select are
controlled through an I2C compatible interface.
Output short circuit and thermal shutdown protection prevent
the device from being damaged during fault conditions. Su-
perior click and pop suppression eliminates audible tran-
sients on power-up/down and during shutdown.
Key Specifications
j Efficiency VDD = 3.6V, 400mW into 8Ω
j Efficiency VDD = 5V, 1W into 8Ω
j Quiescent Power Supply Current @ 3.6V
j Power Output at VDD = 5V
Speaker:
RL = 4Ω, THD+N ≤ 1%
RL = 8Ω, THD+N ≤ 1%
RL = 4Ω, THD+N ≤ 10%
Headphone:
RL = 16Ω, THD+N ≤ 1%
RL = 32Ω, THD+N ≤ 1%
j Shutdown Current
86.5%
87.4%
9.36mA
2W
1.19W
2.5W
153mW
89mW
0.1µA
Features
n Output Short Circuit Protection
n Thermal Shutdown
n Stereo filterless Class D operation
n Selectable OCL/CC Headphone Drivers
n RF Suppression
n I2C Control Interface
n 32-step digital volume control
n Independent Speaker and Headphone Gain Settings
n Minimum external components
n Click and Pop suppression
n Micro-power shutdown
n Available in space-saving 25 bump µSMD package
Applications
n Mobile phones
n PDAs
n Laptops
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS202001
www.national.com
www.DataSheet4U.com
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (Note 1)
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
Junction Temperature
6.0V
−65˚C to +150˚C
−0.3V to VDD +0.3V
Internally Limited
2000V
200V
150˚C
Thermal Resistance
θJA
Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX
Supply Voltage (VDD, VDDLS,
VDDHP)
I2C Voltage (I2CVDD)
35.1˚C/W
−40˚C ≤ TA ≤ +85˚C
2.7V ≤ VDD≤ 5.5V
2.4V ≤ I2CVDD≤ 5.5V
Electrical Characteristics VDD = 3.0V (Notes 1, 2) The following specifications apply for AV = 0dB,
RL(SP) = 15µH + 8Ω + 15µH, RL(HP) = 32Ω, f = 1kHz unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
IDD Supply Current
ISD Shutdown Supply Current
VOS Output Offset Voltage
POUT
Output Power
Conditions
LS Mode
Stereo
Mono
OCL HP Mode
Stereo
Mono
CC HP Mode
Stereo
Mono
Stereo LS + HP Mode
Speaker (mode 1)
OCL HP (mode 1)
LS Mode, f = 1 kHz
RL = 4Ω, THD+N = 10%
RL = 4Ω, THD+N = 1%
RL = 8Ω, THD+N = 10%
RL = 8Ω, THD+N = 1%
OCP HP Mode, f = 1 kHz
RL = 16Ω, THD+N = 10%
RL = 16Ω, THD+N = 1%
RL = 32Ω, THD+N = 10%
RL = 32Ω, THD+N = 1%
CC HP Mode, f = 1 kHz
RL = 16Ω, THD+N = 10%
RL = 16Ω, THD+N = 1%
RL = 32Ω, THD+N = 10%
RL = 32Ω, THD+N = 1%
LM4949
Typical
Limit
(Note 6) (Notes 7, 8)
6 8.75
4.5
5.0 6.5
4.3
4.0
3.3
8.6
0.03
8.9
5.6
5.25
2
48.9
24.5
Units
(Limits)
mA (max)
mA
mA (max)
mA
mA (max)
mA
mA
µA (max)
mV (max)
mV (max)
820 mW
662 mW
515 mW
415 340 mW (min)
62.5
50
37.5
30.3
mW
mW
mW
mW
63 mW
50 mW
38 mW
30 mW (min)
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Electrical Characteristics VDD = 3.6V (Notes 1, 2) The following specifications apply for AV = 0dB,
RL(SP) = 15µH + 8Ω + 15µH, RL(HP) = 32Ω, f = 1kHz unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
IDD Supply Current
ISD Shutdown Supply Current
VOS Output Offset Voltage
POUT
Output Power
THD+N Total Harmonic Distortion + Noise
THD+N Total Harmonic Distortion + Noise
LS Mode
Stereo
Mono
OCL HP Mode
Stereo
Mono
CC HP Mode
Stereo
Mono
Stereo LS + HP Mode
Headphone
Speaker
LS Mode, f = 1 kHz
RL = 4Ω, THD+N = 10%
RL = 4Ω, THD+N = 1%
RL = 8Ω, THD+N = 10%
RL = 8Ω, THD+N = 1%
OCL HP Mode, f = 1 kHz
RL = 16Ω, THD+N = 10%
RL = 16Ω, THD+N = 1%
RL = 32Ω, THD+N = 10%
RL = 32Ω, THD+N = 1%
CC HP Mode, f = 1 kHz
RL = 16Ω, THD+N = 10%
RL = 16Ω, THD+N = 1%
RL = 32Ω, THD+N = 10%
RL = 32Ω, THD+N = 1%
Differential Mode, f = 1kHz
HP Mode, RL = 16Ω, POUT = 50mW
OCL
CC
HP Mode, RL = 32Ω,
POUT = 30mW
OCL
CC
LS Mode
RL = 4Ω, POUT = 400mW
RL = 8Ω, POUT = 300mW
Single-Ended Input Mode, f = 1kHz
HP Mode, RL = 16Ω, POUT = 50mW
OCL
CC
HP Mode, RL = 32Ω, POUT = 30mW
OCL
CC
LS Mode
RL = 4Ω, POUT = 400mW
RL = 8Ω, POUT = 300mW
LM4949
Typical
Limit
(Note 6) (Notes 7, 8)
Units
(Limits)
6.8 7.3 mA (max)
4.9 5.3 mA (max)
5.8 6.5 mA (max)
4.9 5.5 mA (max)
4.7 5.2 mA (max)
4.1 4.6 mA (max)
9.36
mA
0.03
1 µA (max)
6.7 20 mV (max)
8.9 49 mV (max)
1.24
1
0.765
0.615
W
W
W
W
94 mW
76 mW
55 mW
45 mW
93 mW
75 mW
56 mW
45 mW
0.021
0.021
%
%
0.01
0.01
0.023
0.02
%
%
%
%
0.021
0.017
0.02
0.015
0.05
0.034
%
%
%
%
%
%
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