LM4811
Dual 105mW Headphone Amplifier with Digital Volume Control and Shutdown Mode
General Description
The LM4811is a dual audio power amplifier capable of delivering 105mW per channel of continuous average power into a 16Ωload with 0.1%(THD+N)from a 5V power supply.Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components.Since the LM4811does not require bootstrap capacitors or snubber networks,it is optimally suited for low-power portable systems.
The LM4811features a digital volume control that ts the amplifier’s gain from +12dB to −33dB in 16discrete steps using a two−wire interface.
The unity-gain stable LM4811also features an externally controlled,active-high,micropower consump
tion shutdown mode.It also has an internal thermal shutdown protection mechanism.
Key Specifications
n THD+N at 1kHz,105mW continuous average output power into 16Ω0.1%(typ)n THD+N at 1kHz,70mW continuous average power into 32Ω0.1%(typ)n Shutdown Current 0.3µA (typ)
Features
n Digital volume control range from +12dB to −33dB n LD and MSOP surface mount packaging n ’Click and Pop’suppression circuitry n No bootstrap capacitors required n
Low shutdown current
Applications
n Cellular Phones
n MP3,CD,DVD players n PDA’s
n
Portable electronics
Typical Application Connection Diagram
Boomer ®is a registered trademark of National Semiconductor Corporation.
DS200061-1
*Refer to the Application Information Section for information concerning proper lection of the input and output coupling capacitors.
FIGURE 1.Typical Audio Amplifier Application Circuit
MSOP Package
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Top View
Order Number LM4811MM
See NS Package Number MUB10A
LD Package
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Top View
Order Number LM4811LD
See NS Package Number LDA10A
February 2001
LM4811Dual 105mW Headphone Amplifier with Digital Volume Control and Shutdown Mode
©2001National Semiconductor Corporation
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,plea contact the National Semiconductor Sales Office/Distributors for availability and specifications.Supply Voltage
6.0V
Storage Temperature
−65˚C to +150˚C
ESD Susceptibility (Note 4)
2.5kV
ESD Susceptibility Machine model (Note 7)
200V Junction Temperature (T J )150˚C
Soldering Information (Note 1)Small Outline Package Vapor Pha (60c.)215˚C Infrared (15c.)
220˚C
Thermal Resistance θJA MUB10A 194˚C/W θJC MUB10A
52˚C/W θJA LDA10A (Note 8)63˚C/W θJC LDA10A (Note 8)
12˚C/W
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Operating Ratings
Temperature Range T MIN ≤T A ≤T MAX −40˚C ≤T A ≤85˚C Supply Voltage
2.0V ≤V CC ≤5.5V
Note 1:See AN-450“Surface Mounting and their Effects on Product Reli-ability”for other methods of soldering surface mount devices.
Electrical Characteristics (Notes 2,9)
表白书The following specifications apply for V DD =5V unless otherwi specified,limits apply to T A =25˚C.Symbol
Parameter
Conditions
LM4811Units (Limits)Typical (Note 5)
Limit (Note 6)V DD Supply Voltage 2.0V (min)5.5V (max)I DD Supply Current V IN =0V,I O =0A 1.
3 3.0
mA I SD Shutdown Current V IN =0V 0.3µA V OS Output Offt Voltage V IN =0V
4.0
50mV
P O
Output Power
0.1%THD+N;f =1kHz R L =16Ω105mW R L =32Ω
70mW THD+N Total Harmonic Distortion P O =50mW,R L =32Ωf =20Hz to 20kHz 0.3%Crosstalk Channel Separation
R L =32Ω;f =1kHz;P O =70mW
100dB PSRR Power Supply Rejection Ratio C B =1.0µF,V RIPPLE =100mV PP f =217Hz
60
dB V IH (CLOCK,UP/DN,SHUTDOWN)Input Voltage High
1.4V (min)V IL
(CLOCK,UP/DN,SHUTDOWN)Input Voltage Low 0.4
V (max)Digital Volume Range Input referred minimum gain −33dB Input referred maximum gain +12dB Digital Volume Stepsize All 16discrete steps 3.0
dB Stepsize Error
All 16discrete steps ±0.3
dB Channel−to−Channel Volume Tracking Error All gain ttings from −33dB to +12dB 0.15dB Shutdown Attenuation
Shutdown mode active
−100
dB
Electrical Characteristics (Notes 2,9)
高铁票怎么退The following specifications apply for V DD =3.3V unless otherwi specified,limits apply to T A =25˚C.Symbol
Parameter
Conditions
LM4811Units (Limits)Typical (Note 5)
Limit (Note 6)
I DD Supply Current V IN =0V,I O =0A 1.1mA I SD Shutdown Current V IN =0V 0.3µA V OS
Output Offt Voltage
V IN =0V
4.0
mV
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Electrical Characteristics (Notes 2,9)
(Continued)
The following specifications apply for V DD =3.3V unless otherwi specified,limits apply to T A =25˚C.
Symbol
Parameter
Conditions
LM4811Units (Limits)
Typical (Note 5)
Limit (Note 6)
P o
Output Power
0.1%THD+N;f =1kHz R L =16Ω40mW R L =32Ω
28mW THD+N Total Harmonic Distortion P O =25mW,R L =32Ωf =20Hz to 20kHz
0.5%PSRR Power Supply Rejection Ratio C B =1.0µF,V RIPPLE =100mV PP f =217Hz
60dB V IH (CLOCK,UP/DN,SHUTDOWN)Input Voltage High
1.4V (min)V IL
(CLOCK,UP/DN,SHUTDOWN)Input Voltage Low 0.4V (max)Digital Volume Range Input referred minimum gain −33dB Input referred maximum gain +12dB Digital Volume Stepsize All 16discrete steps 3.0
dB Stepsize Error
All 16discrete steps ±0.3
dB Channel−to−Channel Volume Tracking Error All gain ttings from −33dB to +12dB 0.15dB Shutdown Attenuation
Shutdown mode active −100
dB
Electrical Characteristics (Notes 2,9)
The following specifications apply for V DD =2.6V unless otherwi specified,limits apply to T A =25˚C.Symbol
Parameter
Conditions
LM4811Units (Limits)Typical (Note 5)
Limit (Note 6)
I DD Supply Current V IN =0V,I O =0A 1.0mA I SD Shutdown Current V IN =0V 0.3µA V OS Output Offt Voltage V IN =0V
4.0
mV
P o
Output Power
0.1%THD+N;f =1kHz R L =16Ω20mW R L =32Ω
16mW THD+N Total Harmonic Distortion P O =15mW,R L =32Ωf =20Hz to 20kHz
0.6%PSRR Power Supply Rejection Ratio C B =1.0µF,V RIPPLE =100mV PP f =217Hz
60dB V IH (CLOCK,UP/DN,SHUTDOWN)Input Voltage High
1.4V (min)V IL
(CLOCK,UP/DN,SHUTDOWN)Input Voltage Low 0.4V (max)Digital Volume Range Input referred minimum gain −33dB Input referred maximum gain +12dB Digital Volume Stepsize All 16discrete steps 3.0
dB Stepsize Error
All 16discrete steps ±0.3
dB Channel−to−Channel Volume Tracking Error All gain ttings from −33dB to +12dB 0.15dB Shutdown Attenuation
Shutdown mode active −75
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Note 2:Absolute Maximum Ratings 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,e the Electrical Characteristics.The guaranteed specifications apply only for the test conditions listed.Some perform
ance characteristics may degrade when the device is not operated under the listed test conditions.Note 4:Human body model,100pF discharged through a 1.5k Ωresistor.
LM4811
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Electrical Characteristics (Notes 2,9)
(Continued)
Note 5:Typical specifications are specified at +25˚C and reprent the most likely parametric norm.
Note 6:Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).Datasheet min/max specification limits are guaranteed by design,test,or statistical analysis.
Note 7::Machine Model ESD test is covered by specification EIAJ IC-121-1981.A 200pF cap is charged to the specified voltage,then discharged directly into the IC with no external ries resistor (resistance of discharge path must be under 50Ohms).
Note 8:The LDA10A package has its Expod−DAP soldered to an expod 2in 2area of 1oz printed circuit board copper.Note 9:All voltages are measured with respect to the ground pin,unless otherwi specified.
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4
External Components Description(Figure1)
Compo-
nents
家长会内容Functional Description
1.C i This is the input coupling capacitor.It blocks the DC voltage at,and couples the input signal to,the amplifier’s input terminals.C i also creates a highpass filter with the internal input resistor,R i,at f c= 1/(2πR i C i).The minimum value of R i is33kΩ.Refer to the ction,Proper Selection of External Components,for an explanation of how to determine the value of C i.
2.C S This is the supply bypass capacitor.It provides power supply filtering.Refer to the Application Information ction for proper placement and lection of the supply bypass capacitor.
3.C B This is the BYPASS pin capacitor.It provides half-supply filtering.Refer to the ction,Proper Selection of External Components,for information concerning proper placement and lection of C B.
4.C O This is the output coupling capacitor.It blocks the DC voltage at the amplifier’s output and it forms a high pass filter with R L at f O=1/(2πR L C O)
Typical Performance Characteristics
THD+N vs Frequency
DS200061-3THD+N vs Frequency
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THD+N vs Frequency
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THD+N vs Frequency
DS200061-6THD+N vs Frequency
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THD+N vs Frequency
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Typical Performance Characteristics
(Continued)
THD+N vs Frequency
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阿米豆腐
THD+N vs Frequency
DS200061-12THD+N vs Output Power DS200061-13THD+N vs Output Power
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每逢佳节
THD+N vs Output Power DS200061-15THD+N vs Output Power DS200061-16THD+N vs Output Power
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无黄油自制蛋挞皮
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