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LM4874 Datasheet(Fiches technique) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM4874
Description  2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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LM4874
2.1W Differential Input, BTL Output Stereo Audio
Amplifier with Selectable Gain and Shutdown
General Description
The LM4874 features differential stereo inputs, BTL (bridge-
tied load) outputs, and four externally selectable fixed gains.
Operating on a single 5V supply, the LM4874 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
LM4874’s gain is selected using two digital inputs. The nomi-
nal gain values are 6dB, 10dB, 15.6dB, and 21.6dB.
The LM4874 is designed for notebook and other handheld
portable applications. It delivers high quality output power
from a surface-mount package and requires few external
components.
Other features include an active-low micropower shutdown
mode input and 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
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
20046902
Order Number LM4874MH
See NS Package Number MXA20A for Exposed-DAP TSSOP
Boomer® is a registered trademark of National Semiconductor Corporation.
August 2002
© 2002 National Semiconductor Corporation
DS200469
www.national.com




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