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LM4874MH Datasheet

  • LM4874MH

  • 2.1W Differential Input, BTL Output Stereo Audio Amplifier w...

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  • NSC

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LM4874 Boomer 2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain
and Shutdown
August 2002
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鈩? 4鈩? or 3鈩?BTL
load (Note 1), respectively, with less than 1% THD+N. The
LM4874鈥檚 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.
j
BTL output power
R
L
= 8鈩? V
DD
= 5.0V, and THD+N = 1%
j
Micropower shutdown current
j
PSRR (
@
1kHz, V
DD
= 5V, (Fig.1))
1.2W (typ)
0.1碌A(chǔ) (typ)
62dB (typ)
Features
n
n
n
n
n
n
n
Fully differential input and output
Internal gain set: 6dB, 10dB, 15.6dB, and 21.6dB
Improved 鈥檆lick and pop鈥?suppression
Thermal shutdown protection circuit
Ultra low current micropower shutdown mode
3.0V to 5.5V operation
Available in space-saving exposed-DAP TSSOP
package
Key Specifications
j
BTL output power
Applications
2.1W (typ)
1.9W (typ)
n
Notebook computers
n
PDAs
n
Portable electronic devices
R
L
= 3鈩? V
DD
= 5.0V, and THD+N = 1%
j
BTL output power
R
L
= 4鈩? V
DD
= 5.0V, and THD+N = 1%
Connection Diagram
Top View
20046902
Order Number LM4874MH
See NS Package Number MXA20A for Exposed-DAP TSSOP
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2002 National Semiconductor Corporation
DS200469
www.national.com

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