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PDF LM4852 Data sheet ( Hoja de datos )
| Número de pieza | LM4852 | |
| Descripción | Integrated Audio Amplifier System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 2004
LM4852
Integrated Audio Amplifier System
General Description
The LM4852 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
60mW (typ) per channel of continuous average power into
stereo 32Ω single-ended (SE) loads with 0.5% THD+N, us-
ing a 5V power supply.
The LM4852 features a 32 step digital volume control and
eight distinct output modes. The digital volume control and
output modes are programmed through a two-wire I2C com-
patible control interface, that allows flexibility in routing and
mixing audio channels. The LM4852 has 3 channels: one
pair for a two-channel stereo signal and the third for a
single-channel mono input.
The LM4852 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
seven external components.
The industry leading micro SMD package only utilizes 2mm
x 2.3mm of PCB space, making the LM4852 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, 60mW into 32Ω SE
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 60mW (typ) output power with stereo 32Ω SE loads
n I2C programmable 32 step digital volume control
(-40.5dB to +6dB)
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
20060632
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200606
www.national.com
1 page  
Electrical Characteristics 3.0V (Notes 2, 8)
The following specifications apply for VDD= 3.0V, TA= 25˚C unless otherwise specified.
Symbol
Parameter
Conditions
LM4852
Typical Limits
(Note 5) (Notes 6,
11)
Units
(Limits)
IDD Supply Current
ISD Shutdown Current
VOS Output Offset Voltage
PO Output Power
Total Harmonic Distortion Plus
THD+N
Noise
NOUT
PSRR
Output Noise
Power Supply Rejection Ratio
SPKROUT
Power Supply Rejection Ratio
ROUTand LOUT
VIH Logic High Input Voltage
VIL Logic Low Input Voltage
Output modes 2, 4, 6
VIN = 0V; No loads
Output modes 2, 4, 6
VIN = 0V; Loaded (Figure 1)
Output modes 1, 3, 5, 7
VIN = 0V; No loads
Output modes 1, 3, 5, 7
VIN = 0V; Loaded (Figure 1)
Output mode 0
VIN = 0V
SPKROUT; RL = 4Ω
THD+N = 1%; f = 1kHz, LM4852LQ
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 = 150mW; RL = 8Ω
ROUT and LOUT
f = 20Hz to 20kHz
POUT = 10mW; RL = 32Ω
A-weighted (Note 10)
VRIPPLE = 200mVPP; f = 217Hz,
CB = 1.0µF
All audio inputs terminated into 50Ω;
Output referred Gain (BTL) = 6dB
Output Mode 1, 7
Output Mode 3
Output Mode 5
VRIPPLE = 200mVPP; f = 217Hz,
CB = 1.0µF
All audio inputs terminated into 50Ω;
Output referred Maximum gain setting
Output Mode 2
Output Mode 4
Output Mode 6, 7
4 7 mA (max)
5 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)
22 18 mW (min)
0.5 %
0.5 %
26 µV
64 57 dB (min)
58 dB
55 dB
68 60 dB (min)
60 55 dB (min)
56 52 dB (min)
0.7 x VDD
VDD
0.4
V (min)
V (max)
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
200606D7
Output Power vs Load Resistance
200606H7
Output Power vs Load Resistance
200606D9
Power Dissipation vs Output Power
200606H8
Power Dissipation vs Output Power
200606E1
11
200606H9
www.national.com
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet LM4852.PDF ] | |
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