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LM4884 Datasheet(Fiches technique) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM4884
Description  2.1W Differential Input, BTL Output Stereo Audio Amplifier with RF Suppression and Shutdown
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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LM4884
2.1W Differential Input, BTL Output Stereo Audio
Amplifier with RF Suppression and Shutdown
General Description
The LM4884 features differential stereo inputs, BTL (bridge-
tied load) outputs, and four externally selectable fixed gains.
The LM4884 also features proprietary internal circuitry that
suppresses the coupling of RF signals into the chip. This is
important because certain types of RF signals (such as
GSM) can couple into audio amplifiers in such a way that
part of the signal is heard through the speaker. The RF
suppression circuitry in the LM4884 makes it well-suited for
notebook and portable applications in which strong RF sig-
nals generated by an antenna from a PC wireless card or a
cellular phone may couple audibly into the amplifier.
Operating on a single 5V supply, the LM4884 delivers 1.2W,
1.9W, or 2.1W (typ) of output power to an 8
Ω,4Ω,or3Ω BTL
load (Note 1), respectively, with less than 1% THD+N. The
LM4884’s gain is selected using two digital inputs. The nomi-
nal gain values are 6dB, 10dB, 15.6dB, and 21.6dB.
Other features of the LM4884 are that it delivers high-quality
output power from a surface-mount package, requires few
external components, has an active-low micropower shut-
down mode input, and has thermal shutdown protection.
Key Specifications
j BTL output power
R
L =3
Ω,V
DD = 5.0V, and THD+N = 1%
2.1W (typ)
j BTL output power
R
L =4
Ω,V
DD = 5.0V, and THD+N = 1%
1.9W (typ)
j BTL output power
R
L =8
Ω,V
DD = 5.0V, and THD+N = 1%
1.2W (typ)
j Micropower shutdown current
0.1µA (typ)
j PSRR (@ 1kHz, VDD = 5V, (Fig.1))
62dB (typ)
Features
n
Improved RF immunity, by up to 28dB over previous
designs (such as the LM4874) in selected applications.
n
Fully differential input and output
n
Internal gain set: 6dB, 10dB, 15.6dB, and 21.6dB
n
Improved "click and pop" suppression
n
Thermal shutdown protection circuit
n
Ultra low current micropower shutdown mode
n
3.0V to 5.5V operation
n
Available in space-saving exposed-DAP TSSOP
package
Applications
n
Notebook computers
n
PDAs
n
Portable electronic devices
Connection Diagram
Top View
20116302
Order Number LM4884MH
See NS Package Number MXA20A for Exposed-DAP TSSOP
Boomer® is a registered trademark of National Semiconductor Corporation.
April 2005
© 2005 National Semiconductor Corporation
DS201163
www.national.com




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