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PDF LM4851IBL Data sheet ( Hoja de datos )
| Número de pieza | LM4851IBL | |
| Descripción | Integrated Audio Amplifier System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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December 2002
LM4851
Integrated Audio Amplifier System
General Description
The LM4851 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 LM4851 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 LM4851 has 3 inputs: one pair
for a two-channel stereo signal and the third for a single-
channel mono input.
The LM4851 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 five
external components.
The industry leading micro SMD package utilizes only 2mm
x 2.3mm of PCB space, making the LM4851 the most space
efficient audio sub system available today.
Key Specifications
n THD+N at 1kHz, 1.5W into 4Ω BTL (LQ)
n THD+N at 1kHz, 1.1W into 8Ω BTL
n THD+N at 1kHz, 115mW into 32Ω BTL
n Single Supply Operation
1% (typ)
1% (typ)
0.5% (typ)
2.6 to 5.0V
Features
n Mono 1.1W (typ) and stereo 115mW (typ) output
n SPI programmable 32 step digital volume control
(-40.5dB to +6dB)
n Eight distinct SPI programmable output modes
n micro-SMD and LLP surface mount packaging
n “Click and pop” suppression circuitry
n Thermal shutdown protection
n Low shutdown current (0.1µA, typ)
Applications
n Mobile phones
n PDAs
Typical Application
FIGURE 1. Typical Audio Amplifier Application Circuit
20040831
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation DS200408
www.national.com
1 page  
Electrical Characteristics (Notes 2, 8) (Continued)
The following specifications apply for VDD= 3.0V, TA= 25˚C unless otherwise specified.
Symbol
Parameter
Conditions
LM4851
Typical Limit
(Note 5) (Note 6)
Units
(Limits)
Total Harmonic Distortion Plus
THD+N
Noise
NOUT
PSRR
Output Noise
Power Supply Rejection Ratio
VIH Logic High Input Voltage
VIL Logic Low Input Voltage
Digital Volume Range (RIN and
LIN)
Digital Volume Stepsize
Stepsize Error
Phone In Volume
Phone In Volume
Phone In Input Impedance
ROUT and LOUT; f = 1kHz
POUT = 20mW; RL = 32Ω
SPKROUT; f = 1kHz
POUT = 300mW; RL = 8Ω
ROUT and LOUT; f = 20Hz to 20kHz
POUT = 20mW; RL = 32Ω
SPKROUT; f = 20Hz to 20kHz
POUT = 300mW; RL = 4Ω
LM4851LQ
SPKROUT; f = 20Hz to 20kHz
POUT = 250mW; RL = 8Ω
A-weighted (Note 10)
VRIPPLE = 200mVPP; f = 217Hz
Input floating; Input referred
VRIPPLE = 200mVPP; f = 217Hz
Input terminated into 50Ω; Output referred
Input referred minimum gain
Input referred maximum gain
BTL gain from
Phone In to SPKROUT
BTL gain from
Phone In to ROUT,LOUT
0.4
0.3
0.3
29
70
62
-40.5
+6
1.5
±0.5
6
0
20
RIN and LIN
tES Enable Setup Time (ENB)
tEH Enable Hold Time (ENB)
tEL Enable Low Time (ENB)
tDS Data Setup Time (DATA)
tDH Data Hold Time (DATA)
tCS Clock Setup Time (CLK)
tCH Clock Logic High Time (CLK)
tCL Clock Logic Low Time (CLK)
tCLK Clock Frequency
50
0.5 % (max)
1.0 % (max)
%
%
1.4
3.0
0.4
15
25
37.5
62.5
20
20
30
20
20
20
50
50
DC
10
%
µV
dB
dB
V (min)
V (max)
V (max)
dB
dB
dB
dB
dB
kΩ (min)
kΩ (max)
kΩ (min)
kΩ (max)
ns (min)
ns (min)
ns (min)
ns (min)
ns (min)
ns (min)
ns (min)
ns (min)
(min)
MHz (max)
Note 2: Absolute Maximum Rating indicate limits beyond which damage to the device may occur.
Note 3: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and
test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may
degrade when the device is not operated under the listed test conditions.
Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 5: Typical specifications are specified at +25˚C and represent the most likely parametric norm.
Note 6: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Power Dissipation
vs Output Power
Supply Current
vs Supply Voltage
Channel Separation
vs Frequency
20040872
20040855
Frequency Response
Frequency Response
200408A6
Frequency Response
200408A8
200408A9
11
200408B0
www.national.com
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| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LM4851IBL.PDF ] | |
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