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PDF LM4915 Data sheet ( Hoja de datos )
| Número de pieza | LM4915 | |
| Descripción | Pseudo-Differential Mono Headphone Amplifier with Fixed 6dB Gain | |
| Fabricantes | National Semiconductor | |
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May 2003
LM4915
Pseudo-Differential Mono Headphone Amplifier with
Fixed 6dB Gain
General Description
The LM4915 is a pseudo-differential audio power amplifier
primarily designed for demanding applications in mobile
phones and other portable audio device applications with
mono headphones. It is capable of delivering 90 miliwatts of
continuous average power to a 32Ω BTL load with less than
1% distortion (THD+N) from a 3VDC power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4915 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4915 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by driving
the shutdown pin low. Additionally, the LM4915 features an
internal thermal shutdown protection mechanism.
The LM4915 contains advanced pop & click circuitry which
virtually eliminates noises which would otherwise occur dur-
ing turn-on and turn-off transitions.
The LM4915 has an internally fixed gain of 6dB.
Key Specifications
n Improved PSRR at 217Hz and 1kHz
75dB (typ)
n Power Output at 5.0V & 1% THD into 32Ω 280mW (typ)
n Power Output at 3.0V & 1% THD into 32Ω 90mW (typ)
n Output Noise, A-weighted
20µV (typ)
Features
n Pseudo-differential amplification
n Internal gain-setting resistors
n Available in space-saving LLP package
n Ultra low current shutdown mode
n Can drive capacitive loads up to 500pF
n Improved pop & click circuitry virtually eliminates noises
during turn-on and turn-off transitions
n 2.2 - 5.5V operation
n No output coupling capacitors, snubber networks,
bootstrap capacitors or gain-setting resistors required
n Ultra low noise
Applications
n Mobile phones
n PDAs
n Portable electronics devices
Typical Application
200482B4
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200482
www.national.com
1 page  
Typical Performance Characteristics (Continued)
THD+N vs Frequency
VDD = 2.6V, RL = 16Ω, PO = 50mW
THD+N vs Frequency
VDD = 2.6V, RL = 32Ω, PO = 40mW
THD+N vs Output Power
VDD = 5V, RL = 16Ω
200482C2
THD+N vs Output Power
VDD = 5V, RL = 32Ω
200482C3
THD+N vs Output Power
VDD = 3V, RL = 16Ω
200482D2
THD+N vs Output Power
VDD = 3V, RL = 32Ω
200482D3
200482D0
5
200482D1
www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
Order Number LM4915LQ
NS Package Number LQB08A
LIFE SUPPORT POLICY
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
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Americas Customer
Support Center
Email: [email protected]
Tel: 1-800-272-9959
www.national.com
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Support Center
Email: [email protected]
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: [email protected]
Tel: 81-3-5639-7560
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM4915.PDF ] | |
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