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PDF LM48820 Data sheet ( Hoja de datos )
| Número de pieza | LM48820 | |
| Descripción | 95mW Stereo Headphone Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet.in
June 2007
LM48820
Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW
Stereo Headphone Amplifier
General Description
The LM48820 is a ground referenced, fixed-gain audio power
amplifier capable of delivering 95mW of continuous average
power into a 16Ω single-ended load, with less than 1% THD
+N from a 3V power supply.
The LM48820 features a new circuit technology that utilizes
a charge pump to generate a negative reference voltage. This
allows the outputs to be biased about ground, thereby elimi-
nating output-coupling capacitors typically used with normal
single-ended loads.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal number of
external components. The LM48820 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other portable applica-
tions.
The LM48820 features a low-power consumption shutdown
mode selectable for each channel and a soft start function that
reduces start-up current transients. Additionally, the
LM48820 features an internal thermal shutdown protection
mechanism.
The LM48820 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during turn-on
and turn-off transitions.
The LM48820 has an internal fixed gain of 1.5V/V.
Key Specifications
■ Improved PSRR at 217Hz
■ Power Output at VDD = 3V,
RL = 16Ω, THD+N = 1%
■ Shutdown Current
■ Internal Fixed Gain
■ Wide Operating Voltage Range
80dB (typ)
95mW (typ)
0.05µA (typ)
1.5V/V (typ)
1.6V to 4.5V
Features
■ Available in space saving 0.4mm pitch micro SMD
package
■ Fixed Logic Levels
■ Ground referenced outputs
■ High PSRR
■ Ultra low current shutdown mode
■ Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
■ No output coupling capacitors, snubber networks,
bootstrap capacitors, or gain-setting resistors required
■ Shutdown either channel independently
■ Soft start feature reduces start up transient current
Applications
■ Mobile Phones
■ MP3 Players
■ PDAs
■ Portable electronic devices
■ Notebook PCs
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation 202023
www.national.com
1 page  
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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
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
4.75V
−65°C to +150°C
-0.3V to VDD + 0.3V
Internally Limited
2000V
200V
Junction Temperature
Thermal Resistance
θJA (Note 9)
Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX
Supply Voltage (VDD)
150°C
86°C/W (typ)
−40°C ≤ TA ≤ 85°C
1.6V ≤ VDD ≤ 4.5V
Electrical Characteristics VDD = 3V (Notes 1, 2)
The following specifications apply for VDD = 3V, 16Ω load, and the conditions shown in “Typical Audio Amplifier Application Cir-
cuit” (see Figure 1) unless otherwise specified. Limits apply to TA = 25°C.
Symbol
Parameter
Conditions
LM48820
Typical
Limit
(Note 6) (Notes 7, 8)
Units
(Limits)
VIN = 0V, inputs terminated
IDD
Quiescent Power Supply Current both channels enabled
Full Power Mode
VIN = 0V, inputs terminated
one channel enabled
4.7 5.5 mA (max)
3 mA (max)
ISD Shutdown Current
VOS Output Offset Voltage
AV Voltage Gain
ΔAV Gain Match
RIN Input Resistance
SD_LC = SD_RC = GND
RL = 32Ω, VIN = 0V
0.05
1
–1.5
1
20
2 µA (max)
5 mV (max)
V/V
%
15 kΩ (min)
25 kΩ (max)
THD+N = 1% (max); f = 1kHz,
one channel
95
mW
PO Output Power
THD+N = 1% (max); f = 1kHz,
RL = 32Ω, one channel
THD+N = 1% (max); f = 1kHz,
two channels in phase
80 mW
50 40 mW (min)
THD+N
THD+N = 1% (max); f = 1kHz,
RL = 32Ω, two channels in phase
PO = 60mW, f = 1kHz,
single channel
Total Harmonic Distortion + Noise
PO = 50mW, f = 1kHz, RL = 32Ω
single channel
55
0.01
0.007
45 mW (min)
%
%
PSRR
Power Supply Rejection Ratio
Full Power Mode
VRIPPLE = 200mVP-P, Input Referred
f = 217Hz
f = 1kHz
f = 20kHz
80
75
58
dB
dB
dB
SNR
Signal-to-Noise Ratio
RL = 32Ω, PO = 20mW,
(A-weighted)
f = 1kHz, BW = 20Hz to 22kHz
100
dB
VIH
VIL
XTALK
ZOUT
Shutdown Input Voltage High
Shutdown Input Voltage Low
Crosstalk
Output Impedance
VDD = 1.8V to 4.2V
VDD = 1.8V to 4.2V
PO = 1.6mW, f = 1kHz
SD_LC = SD_RC = GND
Input Terminated
Input not terminated
1.2 V (min)
0.45 V (max)
70 dB
30 25 kΩ (min)
30
5 www.national.com
5 Page 
www.DataSheet.in
PSRR vs Frequency
VDD = 3V, RL = 16Ω
PSRR vs Frequency
VDD = 3V, RL = 32Ω
20202367
Power Supply Current vs Power Supply Voltage
VIN = 0V, Mono
20202368
Power Supply Current vs Power Supply Voltage
VIN = 0V, Stereo
20202376
20202377
11 www.national.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LM48820.PDF ] | |
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