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PDF LM4980 Data sheet ( Hoja de datos )
| Número de pieza | LM4980 | |
| Descripción | High Fidelity Stereo Headphone Audio Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
July 2005
LM4980
2 Cell Battery, 1mA, 42mW Per Channel High Fidelity
Stereo Headphone Audio Amplifier for MP3 players
General Description
The LM4980 is a stereo headphone audio amplifier, which
when connected to a 3.0V supply, delivers 42mW to a 16Ω
load with less than 1% THD+N. With the LM4980 packaged
in the SD package, the customer benefits include low profile
and small size. This package minimizes PCB area and maxi-
mizes output power.
The LM4980 features circuitry that significantly reduces out-
put transients (“clicks” and “pops”) while driving headphones
during device turn-on and turn-off without costly external
additional circuitry. The LM4980 also includes an externally
controlled low-power consumption active-low shutdown
mode, and thermal shutdown. Boomer audio power amplifi-
ers are designed specifically to use few external compo-
nents and provide high quality output power in a surface
mount package.
Key Specifications
j Output power
(RL = 16Ω, VDD = 3.0V, THD+N = 1%) 42mW (typ)
j Quiescent current (VDD = 3V)
1mA (typ)
j Micropower shutdown current
0.1µA (typ)
j Supply voltage operating range 1.5V < VDD < 3.3V
j PSRR @ 1kHz, VDD = 3.0V
90dB (typ)
j PSRR @ 217Hz, VDD = 3.0V
100dB (typ)
Features
n 2-cell 1.5V to 3.3V battery operation
n Unity-gain stable
n “Click and pop” suppression circuitry for shutdown and
power on/off transient with headphone loads
n Active low micro-power shutdown
n Thermal shutdown protection circuitry
Applications
n Portable two-cell audio products
n Portable two-cell electronic devices
n Portable MP3 player/recorders
Typical Application
FIGURE 1. Block Diagram
20142901
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS201429
www.national.com
1 page  
Electrical Characteristics VDD = 1.8V (Notes 1, 5) (Continued)
The following specifications apply for the circuit shown in Figure 2, unless otherwise specified. AV = 0dB, RL = 32Ω.
Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4980
Units
Typical
Limit
(Limits)
(Note 6) (Note 7)
PO Output Power (Note 9)
RL = 16Ω,
THD+N = 1%, f = 1kHz, per channel
RL = 32Ω,
THD+N = 1%, f = 1kHz, per channel
11
9
mW (min)
mW (min)
VNO
THD+N
Crosstalk
PSRR
Output Voltage Noise
Total Harmonic Distortion + Noise
Power Supply Rejection Ratio
20Hz to 20kHz, A-weighted, Fig. 2
RL = 32Ω, POUT = 10mW, f = 1kHz
Freq = 1kHz, POUT = 9mW, RL = 32Ω
VRIPPLE = 200mVP-P sine wave
fRIPPLE = 1kHz, CMIDCAP = 4.7µF,
VMID Voltage is Ripple-Free
VRIPPLE = 200mVP-P sine wave
fRIPPLE = 217Hz, CMIDCAP = 4.7µF,
VMID Voltage is Ripple-Free
Input coupling capacitors with 5%
9
0.03
79
78
85
µVRMS
%
dB
dB
dB
CMRR
Common-Mode Rejection Ratio
TWAKE-UP
VIH
VIL
Wake-up Time
Control Logic High
Control Logic Low
tolerance, VIN = VMID,
fRIPPLE = 1kHz
CMIDCAP = 4.7µF, Fig 2.
1.5V ≤ VDD ≤ 3.3V
1.5V ≤ VDD ≤ 3.3V
47 dB
320 ms
1.4V
V (min)
0.4V
V (max)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 2: The maximum power dissipation is dictated by TJMAX, θJA, and the ambient temperature TA must be derated at elevated temperatures. The maximum
allowable power dissipation is PDMAX = (TJMAX − TA) / θJA. For the LM4980, TJMAX = 150˚C. For the θJAs, please see the Application Information section or the
Absolute Maximum Ratings section.
Note 3: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 4: Machine model, 200pF – 220pF discharged through all pins.
Note 5: All voltages are measured with respect to the ground (GND) pins unless otherwise specified.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 8: The quiescent power supply current depends on the offset voltage when a practical load is connected to the amplifier.
Note 9: Output power is measured at the device terminals.
5 www.national.com
5 Page 
Typical Performance Characteristics (TA = 25˚C) (Continued)
Output Power vs Supply Voltage
RL = 32Ω
Output Power vs Supply Voltage
RL = 16Ω
20142990
Output Power vs Load Resistance
VDD = 1.8V
20142991
Output Power vs Load Resistance
VDD = 2.4V
20142973
Output Power vs Load Resistance
VDD = 3.0V
20142974
Load Dissipation vs Amplifier Dissipation
VDD = 1.8V
20142975
11
20142976
www.national.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LM4980.PDF ] | |
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