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PDF LM4912MM Data sheet ( Hoja de datos )
| Número de pieza | LM4912MM | |
| Descripción | Stereo 40mW Low Noise Headphone Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 2003
LM4912
Stereo 40mW Low Noise Headphone Amplifier
General Description
The LM4912 is an stereo audio power amplifier capable of
delivering 40mW per channel of continuous average power
into a 16Ω load or 25mW per channel into a 32Ω load at 1%
THD form a 3V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4912 does not require
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems.
The LM4912 features a low-power consumption shutdown
mode and a power mute mode that allows for faster turn on
time with less than 1mV voltage change at outputs on re-
lease. Additionally, the LM4912 features an internal thermal
shutdown protection mechanism.
The LM4912 is unity gain stable and may be configured with
external gain-setting resistors.
Key Specifications
n PSRR at 217 Hz and 1kHz
65dB (typ)
n Output Power at 1kHz with VDD = 2.4V, 1% THD+N into
a 16Ω load
25mW (typ)
n Output Power at 1kHz with VDD = 3V, 1% THD+N into a
16Ω load
40mW (typ)
n Shutdown Current
1.0µA (max)
n Output Voltage change on release from Shutdown
VDD = 2.4V, RL = 16Ω
1mV (max)
n Output Noise, 20Hz to 20kHz, A-weighted 10µV (typ)
Features
n External gain-setting capability
n Available in space-saving MSOP package
n Ultra low current shutdown mode
n Mute mode allows fast turn-on (10ms) with less than
1mV change on outputs
n 2.0V - 5.5V operation
n Ultra low noise
n Operation at low supply voltages
Applications
n Portable CD players
n PDAs
n Portable electronics devices
Typical Application
20048180
FIGURE 1. Typical Capacitive Coupled Output Configuration Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200481
www.national.com
1 page  
Typical Performance Characteristics
THD+N vs Frequency
THD+N vs Frequency
THD+N vs Frequency
20048184
THD+N vs Frequency
20048185
THD+N vs Frequency
20048186
THD+N vs Frequency
20048187
20048188
5
20048189
www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Noise Floor
Shutdown Hysteresis Voltage, Vdd=5V
200481A8
Shutdown Hysteresis Voltage, Vdd=3V
Power Derating Curve
200481B1
200481B2
200481B3
11 www.national.com
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM4912MM.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LM4912MM | Stereo 40mW Low Noise Headphone Amplifier | National Semiconductor |
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