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PDF LM49101 Data sheet ( Hoja de datos )
| Número de pieza | LM49101 | |
| Descripción | Mono Class AB Audio Subsystem | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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LM49101
March 23, 2009
Mono Class AB Audio Subsystem with a True Ground
Headphone Amplifier and Earpiece Switch
General Description
The LM49101 is a fully integrated audio subsystem with a
mono power amplifier capable of delivering 540mW of con-
tinuous average power into an 8Ω BTL speaker load with 1%
THD+N using a 3.3V supply. The LM49101 includes a sepa-
rate stereo headphone amplifier that can deliver 44mW per
channel into 32Ω loads using a 2.75V supply.
The LM49101 has four input channels. A pair of single-ended
inputs and a fully differential input channel with volume control
and amplification stages. Additionally, a bypass differential
input is available that connects directly to the mono speaker
outputs through an analog switch without any amplification or
volume control stages. The LM49101 features a 32–step dig-
ital volume control on the input stage and an 8–step digital
volume control on the headphone output stage.
The digital volume control and output modes, programmed
through a two-wire I2C compatible interface, allows flexibility
in routing and mixing audio channels.
The LM49101 is designed for cellular phones, PDAs, and
other portable handheld applications. The high level of inte-
gration minimizes external components. The True Ground
headphone amplifier eliminates the physically large DC block-
ing output capacitors reducing required board space and
reducing cost.
Key Specifications
■ Supply Voltage (VDDLS)
■ Supply Voltage (VDDHP)
■ I2C Supply Voltage
■ Output power
VDDLS = 5V, VDDHP = 2.75V
1% THD+N
RL = 8Ω speaker
RL = 32Ω headphone
2.7V ≤ VDDLS ≤ 5.5V
1.8V ≤ VDDHP ≤ 2.9V
1.7V ≤ I2CVDD ≤ 5.5V
1.3W (typ)
45mW (typ)
■ Output Power
VDDLS = 3.3V, VDDHP = 2.75V
1% THD+N
RL = 8Ω speaker
RL = 32Ω headphone
■ PSRR:
VDD = 3.3V, 217Hz ripple, Mono In
■ Shutdown power supply current
540W (typ)
40mW (typ)
90dB (typ)
0.01μA (typ)
Features
■ Differential mono input and stereo single-ended input
■ Separate earpiece (receiver) differential input
■ Analog switch for a separate earpiece path
■ 32-step digital volume control (-80 to +18dB)
■ Three independent volume channels (Left, Right, Mono)
■ Separate headphone volume control
■ Flexible output for speaker and headphone output
■ True Ground headphone amplifier eliminates large DC
blocking capacitors reducing PCB space and cost.
■ Hardware reset function
■ RF immunity topology
■ “Click and Pop” suppression circuitry
■ Thermal shutdown protection
■ Micro-power shutdown
■ I2C control interface
■ Available in space-saving microSMD package
Applications
■ Portable electronic devices
■ Mobile Phones
■ PDAs
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation 300862
www.national.com
1 page  
wwAwb.DsatoaSlhueette4UM.coamximum 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,
VDDLS)
Supply Voltage (Headphone, VDDHP)
Storage Temperature
6.0V
3.0V
−65°C to +150°C
Voltage at Any Input Pin
Power Dissipation (Note 3)
GND − 0.3 to VDD LS + 0.3
Internally Limited
ESD Rating (Note 4)
2000V
ESD Rating (Note 5)
200V
Junction Temperature (TJMAX)
Soldering Information
150°C
Vapor Phase (60sec.)
215°C
Infrared (15sec.)
220°C
See AN-1112 “Micro SMD Wafer Level Chip Scale
Package”
Thermal Resistance
θJA (Note 8)
51°C/W
Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX
Supply Voltage (VDDLS)
Supply Voltage (VDDHP)
Supply Voltage (VDDCP)
Supply Voltage (I2CVDD)
−40°C ≤ TA ≤ 85°C
2.7V ≤ VDDLS ≤ 5.5V
1.8V ≤ VDDHP ≤ 2.9V
VDDHP ≤ VDDLS
VDDCP = VDD HP
1.7V ≤ I2CVDD ≤ 5.5V
I2CVDD ≤ VDDLS
Electrical Characteristics VDDLS = 3.3V, VDDHP = 2.75V (Notes 1, 2)
The following specifications apply for VDDLS = 3.3V, VDDHP = 2.75V, TA = 25°C, all volume controls set to 0dB, unless otherwise
specified. LS = Loudspeaker, HP = Headphone, EP = Earpiece.
Symbol
Parameter
Conditions
LM49101
Typical Limits
(Note 6) (Note 7)
Units
(Limits)
VIN = 0, No Load
EP Receiver
(Output Mode Bit EP Bypass = 1)
0.03 0.045 mA (max)
LS only (Mode 1), GAMP_SD = 0
VDDLS
VDDHP
2.5 4.2 mA (max)
0 mA
LS only (Mode 1), GAMP_SD = 1
VDDLS
VDDHP
2
0
mA
mA
IDD
Quiescent Power Supply Current HP only (Mode 8), GAMP_SD = 0
VDDLS
VDDHP
VDDLS +VDDHP
1.6 2.0 mA (max)
3.1 4.5 mA (max)
6.45 mA (max)
HP only (Mode 8), GAMP_SD = 1
VDDLS
VDDHP
2.8
3.3
mA
mA
LS+HP (Mode 10), GAMP_SD = 0
VDDLS
VDDHP
VDDLS +VDDHP
2.8 3.8 mA (max)
3.1 4.5 mA (max)
8 mA (max)
ISD Shutdown Current
VOS Output Offset Voltage
PO Output Power
Power_On = 0
0.01 2 µA (max)
VIN = 0V, Mode 10
LS output, RL = 8Ω BTL
HP output, RL = 32Ω SE
2.5 22 mV (max)
0.5 5 mV (max)
LS output, Mode 1, RL = 8Ω BTL
540 480 mW (min)
THD+N = 1%, f = 1kHz, LS_Gain = 6dB
HP output, Mode 8, RL = 32Ω SE
THD+N = 1%, f = 1kHz
44 40 mW (min)
5 www.national.com
5 Page 
THD+N vs Frequency
www.DataSheVeDt4DULS.co=m5V, RL = 8Ω BTL, PO = 600mW,
Mode 1 (Mono), 80kHz BW
THD+N vs Frequency
VDDLS = 5V, RL = 8Ω BTL, PO = 600mW,
Mode 2 (Let + Right), 80kHz BW
30086223
THD+N vs Frequency
VDDLS = 5V, VDDHP = 2.75V, RL = 32Ω SE,
PO = 20mW/Ch, Mode 4 (Mono), 80kHz BW
30086224
THD+N vs Frequency
VDDLS = 5V, VDDHP = 2.75V, RL = 32Ω SE,
PO = 20mW/Ch, Mode 8 (Left/Right), 80kHz BW
30086225
THD+N vs Frequency
VDDLS = 5V, VDDHP = 2.75V, RL = 8Ω BTL, RL = 32Ω SE,
PO = 600mW BTL, PO = 20mW/Ch SE, Mode 5 (Mono)
LS (EP Mode) = 0, 80kHz BW
30086228
THD+N vs Frequency
VDDLS = 5V, VDDHP = 2.75V, RL = 8Ω BTL, RL = 32Ω SE,
PO = 600mW BTL, PO = 20mW/Ch SE, Mode 10 (L/R)
LS (EP Mode) = 0, 80kHz BW
30086227
11
30086230
www.national.com
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| PDF Descargar | [ Datasheet LM49101.PDF ] | |
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