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PDF LM4874 Data sheet ( Hoja de datos )
| Número de pieza | LM4874 | |
| Descripción | 2.1W Differential Input/ BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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 8Ω, 4Ω, or 3Ω 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
RL = 8Ω, VDD = 5.0V, and THD+N = 1%
j Micropower shutdown current
j PSRR (@ 1kHz, VDD = 5V, (Fig.1))
1.2W (typ)
0.1µA (typ)
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
j BTL output power
RL = 3Ω, VDD = 5.0V, and THD+N = 1%
j BTL output power
RL = 4Ω, VDD = 5.0V, and THD+N = 1%
2.1W (typ)
1.9W (typ)
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.
© 2002 National Semiconductor Corporation DS200469
www.national.com
1 page  
Typical Performance Characteristics
MH Specific Characteristics (Continued)
THD vs Frequency
THD vs Frequency
20046999
VDD = 5V, RL = 8Ω, POUT = 400mW,
at (from top to bottom at 1kHz):
AV = 21.6dB, AV = 15.6dB,
AV = 10dB, AV = 6dB
THD vs Frequency
20046943
VDD = 5V, RL = 3Ω, fIN = 20Hz,
at (from top to bottom at 50mW):
AV = 21.6dB, AV = 15.6dB,
AV = 10dB, AV = 6dB
THD vs Frequency
20046944
VDD = 5V, RL = 3Ω, fIN = 1kHz,
at (from top to bottom at 50mW):
AV = 21.6dB, AV = 15.6dB,
AV = 10dB, AV = 6dB
20046945
VDD = 5V, RL = 3Ω, fIN = 20kHz,
at (from top to bottom at 50mW):
AV = 21.6dB, AV = 15.6dB,
AV = 10dB, AV = 6dB
5 www.national.com
5 Page 
Typical Performance Characteristics
MH Specific Characteristics (Continued)
Output Power vs
Load Resistance
Channel-to-Channel gain Mismatch
vs Power Supply Voltage
200469C0
fIN = 1kHz, at (from top to bottom at 20Ω):
VDD = 5V, THD = 10%; VDD = 5V, THD = 1%;
VDD = 3V, THD = 10%; VDD = 3V, THD = 1%
Channel-to-Channel gain Mismatch
vs Power Supply Voltage
200469C1
RL = 4Ω, fIN = 1kHz,
at (from top to bottom at 4V):
AV = 21.6dB, AV = 15.6dB,
AV = 10dB, AV = 6dB
Dropout Voltage
vs Power Supply Voltage
200469C2
RL = 8Ω, fIN = 1kHz,
at (from top to bottom at 4V):
AV = 21.6dB, AV = 15.6dB,
AV = 10dB, AV = 6dB
200469C5
RL = 8Ω, fIN = 1kHz, both channels driven and loaded
at (from top to bottom at 4V):
positive signal swing, negative signal swing
11 www.national.com
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet LM4874.PDF ] | |
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