lm4881mmx

Manufacturer Part Numberlm4881mmx
DescriptionDual 200 Mw Headphone Amplifier With Shutdown Mode
ManufacturerNational Semiconductor Corporation
lm4881mmx datasheet
 


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LM4881
Dual 200 mW Headphone Amplifier with Shutdown Mode
General Description
The LM4881 is a dual audio power amplifier capable of
delivering 200mW of continuous average power into an 8Ω
load 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 using surface mount packaging. Since
the LM4881 does not require bootstrap capacitors or snub-
ber networks, it is optimally suited for low-power portable
systems.
The LM4881 features an externally controlled, low power
consumption shutdown mode which is virtually clickless and
popless, as well as an internal thermal shutdown protection
mechanism.
The unity-gain stable LM4881 can be configured by external
gain-setting resistors.
Key Specifications
j
THD+N at 1kHz at 125mW
continuous average output
power into 8Ω
Typical Application
*Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
j
THD+N at 1kHz at 75mW
continuous
average output power into 32Ω
j
Output power at 10% THD+N
at 1kHz into 8Ω
j
Shutdown Current
j
Supply voltage range
Features
n MSOP surface mount packaging
n Unity-gain stable
n External gain configuration capability
n Thermal shutdown protection circuitry
n No bootstrap capacitors, or snubber circuits are
necessary
Applications
n Headphone Amplifier
n Personal Computers
0.1% (max)
n Microphone Preamplifier
DS100005
September 2004
0.02% (typ)
300mW (typ)
0.7µA (typ)
2.7V to 5.5V
10000501
www.national.com

lm4881mmx Summary of contents

  • Page 1

    ... Typical Application *Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors. FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation j THD+N at 1kHz at 75mW continuous average output power into 32Ω ...

  • Page 2

    Connection Diagrams www.national.com MSOP Package SOP and DIP Package Top View Order Number LM4881MM, LM4881M, or LM4881N See NS Package Number MUA08A, M08A, or N08E 2 10000502 10000538 ...

  • Page 3

    Absolute Maximum Ratings 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 4) ESD Susceptibility (Note 5) ESD Susceptibility (Note 6) Junction ...

  • Page 4

    Electrical Characteristics The following specifications apply for V Symbol Parameter I Quiescent Current DD I Shutdown Current SD V Offset Voltage OS P Output Power O THD+N Total Harmonic Distortion + Noise PSRR Power Supply Rejection Ratio Note 2: All ...

  • Page 5

    External Components Description (Figure 1) Components 1. R Inverting input resistance which sets the closed-loop gain in conjuction with high pass filter with Input coupling capacitor which blocks the DC voltage at the amplifier’s ...

  • Page 6

    Typical Performance Characteristics THD+N vs Frequency THD+N vs Output Power THD+N vs Output Power www.national.com (Continued) THD+N vs Frequency 10000507 THD+N vs Output Power 10000509 THD+N vs Output Power 10000511 6 10000508 10000510 10000512 ...

  • Page 7

    Typical Performance Characteristics THD+N vs Output Power Output Power vs Supply Voltage Output Power vs Supply Voltage (Continued) THD+N vs Output Power 10000513 10000515 10000517 7 10000514 Output Power vs Supply Voltage 10000516 Power Dissipation vs Output Power 10000518 www.national.com ...

  • Page 8

    Typical Performance Characteristics Output Power vs Load Resistance Power Dissipation vs Output Power Clipping Voltage vs Supply Voltage www.national.com (Continued) 10000519 10000521 10000523 8 Output Power vs Load Resistance 10000520 Clipping Voltage vs Supply Voltage 10000522 Channel Separation 10000524 ...

  • Page 9

    Typical Performance Characteristics Output Attenuation in Shutdown Mode Power Supply Rejection Ratio Noise Floor (Continued) 10000525 10000527 Frequency Response vs Output Capacitor Size 10000529 9 Supply Current vs Supply Voltage 10000526 Open Loop Frequency Response 10000528 10000530 www.national.com ...

  • Page 10

    Typical Performance Characteristics Frequency Response vs Output Capacitor Size Typical Application Frequency Response Power Derating Curve www.national.com (Continued) Frequency Response vs Output Capacitor Size 10000531 10000533 10000535 10 10000532 Typical Application Frequency Response 10000534 ...

  • Page 11

    Application Information SHUTDOWN FUNCTION In order to reduce power consumption while not in use, the LM4881 contains a shutdown pin to externally turn off the amplifier’s bias circuitry. This shutdown feature turns the amplifier off when a logic high is ...

  • Page 12

    Application Information shutdown function should be virtually clickless and popless. While the device will function properly, (no oscillations or motorboating), with C equal to 0.1 µF, the device will be B much more susceptible to turn on clicks and pops. ...

  • Page 13

    Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM4881MM NS Package Number MUA08A Order Number LM4881M NS Package Number M08A 13 www.national.com ...

  • Page 14

    ... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...