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PDF LM4849 Data sheet ( Hoja de datos )
| Número de pieza | LM4849 | |
| Descripción | Stereo 2W Audio Power Amplifiers with DC Volume Control and Input Mux | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 2003
LM4849
Stereo 2W Audio Power Amplifiers
with DC Volume Control and Input Mux
General Description
The LM4849 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifi-
ers capable of producing 2W into 4Ω (Note 1) with less than
1.0% THD+N, or 2.2W into 3Ω (Note 2) with less than 1.0%
THD+N.
Boomer® audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4849 incorporates a
DC volume control, stereo bridged audio power amplifiers,
and an input mux making it optimally suited for multimedia
monitors, portable radios, desktop, and portable computer
applications.
The LM4849 features an externally controlled, low-power
consumption shutdown mode, and both a power amplifier
and headphone mute for maximum system flexibility and
performance.
Note 1: When properly mounted to the circuit board, the LM4849MH will
deliver 2W into 4Ω. See the Application Information section for LM4849MH
usage information.
Note 2: An LM4849MH that has been properly mounted to the circuit board
and forced-air cooled will deliver 2.2W into 3Ω.
Key Specifications
j PO at 1% THD+N
into 3Ω (Note2)
into 4Ω (Note1)
into 8Ω
j Single-ended mode - THD+N at 85mW
into 32Ω
j Shutdown Current
2.2W (typ)
2.0W (typ)
1.1W (typ)
1.0% (typ)
0.2µA (typ)
Features
n DC Volume Control Interface
n Input mux
n Stereo switchable bridged/single-ended power amplifiers
n “Click and pop” suppression circuitry
n Thermal shutdown protection circuitry
Applications
n Portable and Desktop Computers
n Multimedia, LCD Monitors/TV
n Portable Radios, PDAs, and Portable TVs
Connection Diagram
TSSOP Package
20076702
Top View
Order Number LM4849MH
See NS Package Number MXA28A for Exposed-DAP TSSOP
Boomer® is a registered trademark of NationalSemiconductor Corporation.
© 2003 National Semiconductor Corporation DS200767
www.national.com
1 page  
Truth Table for Logic Inputs (Note 16)
Mute
0
0
0
0
1
Mux Control
0
0
1
1
X
HP Sense
0
1
0
1
X
Inputs Selected Bridged Output
Left In 1, Right In 1
Left In 1, Right In 1
Left In 2, Right In 2
Left In 2, Right In 2
-
Vol. Adjustable
Muted
Vol. Adjustable
Muted
Muted
Single-Ended
Output
-
Vol. Adjustable
-
Vol. Adjustable
Muted
Note 16: If system beep is detected on the Beep in pin (pin 11) and beep is fed to inputs, the system beep will be passed through the bridged amplifier regardless
of the logic of the Mute, HP sense, or DC Volume Control pins.
Typical Performance Characteristics
LM4849MH
THD+N vs Output Power
LM4849MH
THD+N vs Frequency
20076770
LM4849MH
THD+N vs Output Power
LM4849MH
THD+N vs Frequency
20076771
20076772
20076773
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Noise Floor
Noise Floor
Volume Control
Characteristics
20076741
20076742
Power Dissipation vs
Output Power
20076736
Power Dissipation vs
Output Power
20076751
Power Derating Curve
20076752
11
20076763
www.national.com
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet LM4849.PDF ] | |
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