LM4811
Dual105mW Headphone Amplifier with Digital Volume Control and Shutdown Mode
General Description
The LM4811is a dual audio power amplifier capable of
delivering105mW per channel of continuous average power
into a16Ωload with0.1%(THD+N)from a5V 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 in16discrete steps
using a two−wire interface.
The unity-gain stable LM4811also features an externally
controlled,active-high,micropower consumption shutdown
mode.It also has an internal thermal shutdown protection
mechanism.
Key Specifications
n THD+N at1kHz,105mW continuous average output
power into16Ω0.1%(typ)
n THD+N at1kHz,70mW continuous average power into
32Ω0.1%(typ)
n Shutdown Current0.3µA(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描绘的拼音
n Low shutdown current
Applications
n Cellular Phones
n MP3,CD,DVD players
n PDA’s王者刘备
n Portable electronics
Connection Diagrams
MSOP Package
20006102
Top View
Order Number LM4811MM
See NS Package Number MUB10A
LD Package
20006162
Top View
Order Number LM4811LD
See NS Package Number LDA10A Boomer®is a registered trademark of National Semiconductor Corporation.
December2002LM4811
Dual
105mW
Headphone
Amplifier
with
Digital
Volume
Control
and
Shutdown
Mode ©2002National Semiconductor Corporation
Typical Application怎么发qq邮箱
20006101
*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
L M 4811
2
Absolute Maximum Ratings
(Note 1)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 3) 2.5kV ESD Susceptibility Machine model (Note 6)
200V Junction Temperature (T J )150˚C
Soldering Information 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 7)63˚C/W θJC LDA10A (Note 7)
12˚C/W
Operating Ratings
Temperature Range T MIN ≤T A ≤T MAX −40˚C ≤T
A
≤85˚C
Supply Voltage
2.0V ≤V CC ≤5.5V
Electrical Characteristics (Notes 1,8)
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 4)
Limit (Note 5)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
LM4811
3
Electrical Characteristics (Notes 1,8)
诱人的近义词是什么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 4)
Limit (Note 5)
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
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 1,8)
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 4)
Limit (Note 5)
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
有关思念的诗句dB Stepsize Error
All 16discrete steps ±0.3
dB Channel−to−Channel Volume Tracking Error
All gain ttings from −33dB to +12dB 0.15
dB
L M 4811真人交配视频
4
Electrical Characteristics (Notes 1,8)
(Continued)
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 4)
Limit (Note 5)
Shutdown Attenuation Shutdown mode active −75
dB
Note 1:Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 2: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 performance characteristics may degrade when the device is not operated under the listed test conditions.Note 3:Human body model,100pF discharged through a 1.5k Ωresistor.
Note 4:Typical specifications are specified at +25˚C and reprent the most likely parametric norm.
Note 5: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 6::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 7:The LDA10A package has its Expod−DAP soldered to an expod 2in 2area of 1oz printed circuit board copper.Note 8:All voltages are measured with respect to the ground pin,unless otherwi specified.
韭菜豆腐水饺
External Components Description
(Figure 1)Components
家庭保险规划
Functional Description
1.C i
This is the input coupling capacitor.It blocks the DC voltage at,and couples the input signal to,the am
plifier’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 is 33k Ω.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
THD+N vs Frequency
2000610320006104
LM4811
5
