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PDF LM4875MM Data sheet ( Hoja de datos )
| Número de pieza | LM4875MM | |
| Descripción | 750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM4875MM (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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January 2002
LM4875
750 mW Audio Power Amplifier with DC Volume Control
and Headphone Switch
General Description
The LM4875 is a mono bridged audio power amplifier with
DC voltage volume control. The LM4875 is capable of deliv-
ering 750mW of continuous average power into an 8Ω load
with less than 1% THD when powered by a 5V power supply.
Switching between bridged speaker mode and headphone
(single ended) mode is accomplished using the headphone
sense pin. To conserve power in portable applications, the
LM4875’s micropower shutdown mode (IQ = 0.7µA, typ) is
activated when less than 300mV is applied to the DC Vol/SD
pin.
Boomer audio power amplifiers are designed specifically to
provide high power audio output while maintaining high fidel-
ity. They require few external components and operate on
low supply voltages.
Applications
n GSM phones and accessories, DECT, office phones
n Hand held radio
n Other portable audio devices
Key Specifications
j PO at 1.0% THD+N into 8Ω
j PO at 10% THD+N into 8Ω
j Shutdown current
j Supply voltage range
750mW (typ)
1W (typ)
0.7µA(typ)
2.7V to 5.5V
Features
n Precision DC voltage volume control
n Headphone amplifier mode
n “Click and pop” suppression
n Shutdown control when volume control pin is low
n Thermal shutdown protection
Typical Application
Connection Diagram
Small Outline Package (SO)
Mini Small Outline Package (MSOP)
10104202
Top View
Order Number LM4875M, LM4875MM
See NS Package Number M08A, MUA08A
10104201
FIGURE 1. Typical Audio Amplifier
Application Circuit
BOOMER™ is a trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS101042
www.national.com
1 page  
Typical Performance Characteristics (Continued)
Noise Floor
Frequency Response vs
Input Capacitor Size
Power Supply
Rejection Ratio
10104216
10104217
Attenuation Level vs
DC-Vol Amplitude
10104218
THD+N vs Frequency
10104219
THD+N vs Frequency
10104220
5
10104221
www.national.com
5 Page 
Application Information (Continued)
10104241
FIGURE 7. Recommended MSOP PC board layout:
component side silkscreen
10104245
FIGURE 9. Recommended MSOP PC board layout:
bottom side layout
10104242
FIGURE 8. Recommended MSOP PC board layout:
component side layout
11
www.national.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LM4875MM.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LM4875M | 750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch | National Semiconductor |
| LM4875MM | 750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch | National Semiconductor |
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