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PDF LM49100 Data sheet ( Hoja de datos )
| Número de pieza | LM49100 | |
| Descripción | Mono Class AB Audio Subsystem | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM49100 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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www.DataSheet4U.com
June 2007
LM49100
Mono Class AB Audio Subsystem with a True-Ground
Headphone Amplifier
General Description
The LM49100 is a fully integrated audio subsystem capable
of delivering 1.275W of continuous average power into a
mono 8Ω bridged-tied load (BTL) with 1% THD+N and with a
5V power supply. The LM49100 also has a stereo true-ground
headphone amplifier capable of 50mW per channel of con-
tinuous average power into a 32Ω single-ended (SE) loads
with 1% THD+N.
The LM49100 has three input channels. One pair of SE inputs
can be used with a stereo signal. The other input channel is
fully differential and may be used with a mono input signal.
The LM49100 features a 32-step digital volume control and
ten distinct output modes. The mixer, volume control, and de-
vice mode select are controlled through an I2C compatible
interface.
Thermal overload protection prevent the device from being
damaged during fault conditions. Superior click and pop sup-
pression eliminates audible transients on power-up/down and
during shutdown.
Key Specifications
■ Power Output at VDD = 5V:
Speaker:
RL = 8Ω, THD+N ≤ 1%
Headphone (VDDHP = 2.8V):
RL = 32Ω, THD+N ≤ 1%
■ Shutdown current
1.275W
50mW
0.01µA
Features
■ Mono and stereo inputs
■ Thermal Overload Protection
■ True-ground Headphone Drivers
■ I2C Control Interface
■ Input mute attenuation
■ 2nd Stage headphone attenuator
■ 32-step digital volume control
■ 10 Operating Modes
■ Minimum external components
■ Click and Pop suppression
■ Micro-power shutdown
■ Available in space-saving 3mm x 3mm 25 bump GR
package
■ RF Suppression
Applications
■ Mobile Phones
■ PDAs
■ Laptops
■ Portable Electronics
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation 300015
www.national.com
1 page  
www.DataSheet4U.com
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 (Loudspeaker)
Supply Voltage (Headphone)
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
Junction Temperature
6V
3V
−65°C to +150°C
−0.3V to VDD + 0.3V
Internally Limited
2000V
200V
150°C
Thermal Resistance
θJA (GR)
Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX
Supply Voltage VDDLS
Supply Voltage VDDHP
I2C Voltage (VDDI2C )
50.2°C/W
−40°C ≤ TA ≤ +85°C
2.7V ≤ VDDLS ≤ 5.5V
2.4 V ≤ VDDHP ≤ 2.9V
1.7V ≤ VDDI2C ≤ 5.5V
VDDHP ≤ VDDLS
VDDI2C ≤ VDDLS
Electrical Characteristics VDDLS = 3.6V, VDDHP = 2.8V (Notes 1, 2)
The following specifications apply for all programmable gain set to 0 dB, CB = 4.7μF, RL (SP) = 8Ω, RL(HP) = 32Ω, f = 1 kHz unless
otherwise specified. Limits apply for TA = 25°C.
Symbol
Parameter
Conditions
LM49100
Typical
(Note 6)
Limit
(Note 7)
Units
(Limits)
Modes 1, 3, 5
VIN = 0V, No Load
Modes 2, 4, 6
VDDLS = 3.0V VIN = 0V, No Load
Modes 7, 10, 14
VIN = 0V, No Load
Modes 1, 3, 5
VIN = 0V, No Load
IDD Supply Current
VDDLS = 3.6V
Modes 2, 4, 6
VIN = 0V, No Load
Modes 7, 10, 14
VIN = 0V, No Load
Modes 1, 3, 5
VIN = 0V, No Load
Modes 2, 4, 6
VDDLS = 5.0V VIN = 0V, No Load
Modes 7, 10, 14
VIN = 0V, No Load
ISD
Shutdown Supply Current
Mode 0
VIN = 0V, Mode
7, Mono
2.9
3.4
4.8
2.9
3.5
4.8
3.1
3.6
5.0
0.01
6.0
mA
mA
mA
4.3 mA (max)
5.4 mA (max)
7.4 mA (max)
mA
mA
mA
1 µA (max)
25 mV (max)
VOS
Output Offset Voltage
VIN = 0V, Mode 7, Headphone Gain = –24dB
VIN = 0V, Mode 7, Headphone Gain = –18dB
2.2
2.4
mV
mV
VIN = 0V, Mode 7, Headphone Gain = –12dB
3.2
mV
VIN = 0V, Mode 7, Headphone Gain = 0dB
7 15 mV (max)
LS
f = 1kHz
RL = 8Ω
1%
10%
425
525
mW
mW
POUT
Output Power
VDDLS = 3.0V
HP
f = 1kHz
RL = 16Ω
1%
10%
RL = 32Ω
1%
10%
49
69
35
44
mW
mW
mW
mW
5 www.national.com
5 Page 
www.DataSheet4U.com
Power Dissipation vs Output Power
VDD = 5V, RL = 8Ω,
f = 1kHz, Mode 1
Supply Current vs VDDLS
VDDHP = 2.8V, Mode 1, 3, 5, No Load
300015p7
Supply Current vs VDDLS
VDDHP = 2.8V, Mode 2, 4, 6, No Load
30001564
Supply Current vs VDDLS
VDDHP = 2.8V, Mode 7,10, 14, No Load
30001565
PSRR vs Frequency
RL = 32Ω, VRIPPLE = 200mVPP on VDDHP
VDDHP = 2.8V, CB = 4.7μF, Mode 2, 10
30001570
PSRR vs Frequency
RL = 32Ω, VRIPPLE = 200mVPP on VDDHP
VDDHP = 2.8V, CB = 4.7μF, Mode 4, 7
300015k4
11
300015k5
www.national.com
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| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LM49100.PDF ] | |
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