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PDF LM4855LQ Data sheet ( Hoja de datos )
| Número de pieza | LM4855LQ | |
| Descripción | Boomer AUDIO POWER AMPLIFIER Integrated Audio Amplifier System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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November 2002
LM4855
Integrated Audio Amplifier System
General Description
The LM4855 is an audio power amplifier system capable of
delivering 1.1W (typ) of continuous average power into a
mono 8Ω bridged-tied load (BTL) with 1% THD+N and
115mW (typ) per channel of continuous average power into
stereo 32Ω BTL loads with 0.5% THD+N, using a 5V power
supply.
The LM4855 features a 32 step digital volume control and
eight distinct output modes. The digital volume control and
output modes are programmed through a three-wire SPI
serial control interface, that allows flexibility in routing and
mixing audio channels.
The LM4855 is designed for cellular phone, PDA, and other
portable handheld applications. It delivers high quality output
power from a surface-mount package and requires only six
external components.
The industry leading micro SMD package only utilizes 2mm
x 2.3mm of PCB space, making the LM4855 the most space
efficient audio sub system available today.
Key Specifications
n THD+N at 1kHz, 1.1W into 8Ω BTL
n THD+N at 1kHz, 115mW into 32Ω BTL
n Single Supply Operation
1.0% (typ)
0.5% (typ)
2.6 to 5.0V
Features
n 1.1W (typ) output power with 8Ω mono BTL load
n 115mW (typ) output power with stereo 32Ω BTL loads
n SPI programmable 32 step digital volume control
n Eight distinct output modes
n micro-SMD and LLP surface mount packaging
n "Click and Pop" suppression circuitry
n Thermal shutdown protection
n Low shutdown current (0.1uA, typ)
Applications
n Moblie Phones
n PDAs
Typical Application
FIGURE 1. Typical Audio Amplifier Application Circuit
200395D1
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation DS200395
www.national.com
1 page  
Electrical Characteristics (Notes 2, 8)
The following specifications apply for VDD= 3.0V, TA= 25˚C unless otherwise specified.
Symbol
Parameter
Conditions
LM4855
Typical Limits
(Note 5) (Note 6)
Units
(Limits)
IDD Supply Current
ISD Shutdown Current
VOS Output Offset Voltage
PO Output Power
Total Harmonic Distortion Plus
THD+N
Noise
NOUT
Output Noise
Power Supply Rejection Ratio
SPKROUT
PSRR
Power Supply Rejection Ratio
ROUTand LOUT
VIH Logic High Input Voltage
VIL Logic Low Input Voltage
Output mode 1
VIN = 0V; No loads
Output mode 1
VIN = 0V; Loaded (Fig.1)
Output modes 2, 3, 4, 5, 6, 7
VIN = 0V; No loads
Output modes 2, 3, 4, 5, 6, 7
VIN = 0V; Loaded (Fig. 1)
Output mode 0
VIN = 0V
SPKROUT; RL = 4Ω
THD+N = 1%; f = 1kHz, LM4855LQ
SPKROUT; RL = 8Ω
THD+N = 1%; f = 1kHz
ROUT and LOUT; RL = 32Ω
THD+N = 0.5%; f = 1kHz
SPKROUT
f = 20Hz to 20kHZ
POUT = 250mW; RL = 8Ω
ROUT and LOUT
f = 20Hz to 20kHZ
POUT = 20mW; RL = 32Ω
A-weighted (Note 10)
VRIPPLE = 200mVPP; f = 217Hz, CB =
1.0µF
All audio inputs terminated into 50Ω;
Output referred Gain (BTL) = 12dB
Output Mode 1, 3, 5, 7
VRIPPLE = 200mVPP; f = 217Hz, CB =
1.0µF
All audio inputs terminated into 50Ω;
Output referred Maximum gain setting
Output Mode 2, 3
Output Mode 4, 5
Output Mode 6, 7
4.5 7 mA (max)
5.0 8 mA (max)
6.5 10 mA (max)
7 11 mA (max)
0.1 2.0 µA (max)
5.0 40 mV (max)
430 mW
340 300 mW (min)
25 20 mW (min)
0.5 %
0.5 %
29 µV
58 55 dB (min)
63 60 dB (min)
58 55 dB (min)
55 52 dB (min)
1.4 V (min)
VDD V (max)
0.4 V (max)
GND
V (min)
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Output Power vs Supply Voltage
Output Power vs Supply Voltage
200395D7
Output Power vs Load Resistance
200395D8
Output Power vs Load Resistance
200395D9
Power Dissipation vs Output Power
200395E0
Power Dissipation vs Output Power
200395E1
11
200395E2
www.national.com
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| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LM4855LQ.PDF ] | |
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