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LM4929 数据表(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部件名 LM4929
功能描述  Stereo 40mW Low Noise Headphone Amplifier with OCL Output
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM4929 数据表(HTML) 1 Page - National Semiconductor (TI)

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LM4929
Stereo 40mW Low Noise Headphone Amplifier
with OCL Output
General Description
The LM4929 is an stereo audio power amplifier capable of
delivering 40mW per channel of continuous average power
into a 16
Ω load or 25mW per channel into a 32Ω load at 1%
THD+N from 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 LM4929 does not require
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems. The LM4929 is con-
figured for OCL (Output Capacitor-Less) outputs, operating
with no DC blocking capacitors on the outputs.
The LM4929 features a low-power consumption shutdown
mode with a faster turn on time. Additionally, the LM4929
features an internal thermal shutdown protection mecha-
nism.
The LM4929 is unity gain stable and may be configured with
external gain-setting resistors.
Key Specifications
j PSRR at 217Hz and 1kHz
65dB (typ)
j Output Power at 1kHz with VDD = 2.4V,
1% THD+N into a 16
Ω load
25mW (typ)
j Output Power at 1kHz with VDD = 3V,
1% THD+N into a 16
Ω load
40mW (typ)
j Shutdown current
2.0µA (max)
j Output Voltage change on release
from Shutdown V
DD = 2.4V, RL =16
1mV (max)
Features
n
OCL outputs — No DC Blocking Capacitors
n
External gain-setting capability
n
Available in space-saving MSOP package
n
Ultra low current shutdown mode
n
2V - 5.5V operation
n
Ultra low noise
Applications
n
Portable CD players
n
PDAs
n
Portable electronics devices
Block Diagram
Boomer® is a registered trademark of National Semiconductor Corporation.
20132441
FIGURE 1. Block Diagram
December 2004
© 2004 National Semiconductor Corporation
DS201324
www.national.com


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