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LM4874MH-LM4874MHX
2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown
LM4874
2.1W Differential Input, BTL Output Stereo Audio
Amplifier with Selectable Gain and Shutdown
General DescriptionThe LM4874 features differential stereo inputs, BTL (bridge-
tied load) outputs, and four externally selectable fixed gains.
Operatingona single5V supply,the LM4874 delivers 1.2W,
1.9W,or 2.1W (typ)of output powertoan 8Ω,4Ω,or3Ω BTL
load (Note1), respectively, with less than 1% THD+N. The
LM4874’s gainis selected using two digital inputs. The nomi-
nal gain values are 6dB, 10dB, 15.6dB, and 21.6dB.
The LM4874is designedfor notebook and other handheld
portable applications.It delivers high quality output power
froma surface-mount package and requires few external
components.
Other features includean active-low micropower shutdown
mode input and thermal shutdown protection.
Key Specifications BTL output power =3Ω,VDD= 5.0V, and THD+N= 1% 2.1W (typ) BTL output power =4Ω,VDD= 5.0V, and THD+N= 1% 1.9W (typ) BTL output power =8Ω,VDD= 5.0V, and THD+N= 1% 1.2W (typ) Micropower shutdown current 0.1µA (typ) PSRR(@ 1kHz, VDD= 5V, (Fig.1)) 62dB (typ)
Features Fully differential input and output Internal gain set: 6dB, 10dB, 15.6dB, and 21.6dB Improved ’click and pop’ suppression Thermal shutdown protection circuit Ultra low current micropower shutdown mode 3.0Vto 5.5V operation Availablein space-saving exposed-DAP TSSOP
package
Applications Notebook computers PDAs Portable electronic devices
Connection Diagram
Top ViewOrder Number LM4874MH
See NS Package Number MXA20Afor Exposed-DAP TSSOP
August 2002
LM4874
Boomer
2.1W
Differential
Input,
BTL
Output
Stereo
Audio
Amplifier
with
Selectable
and
Shutdown
