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LM4681 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4681
Description  10 Watt Stereo CLASS D Audio Power Amplifier with Stereo Headphone Amplifier and I2C/SPI Volume Control
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM4681
10 Watt Stereo CLASS D Audio Power Amplifier with
Stereo Headphone Amplifier and I
2C/SPI Volume Control
General Description
The LM4681 is a fully integrated single supply, CLASS D
audio power amplifier solution. The LM4681 utilizes a pro-
prietary balanced pulse-width modulation technique that low-
ers output noise and THD and improves PSRR when com-
pared to conventional pulse width modulators.
The LM4681 also features a stereo headphone amplifier that
delivers 80mW into a 32
Ω headset with less than 0.5% THD.
The LM4681’s I
2C/SPI (selectable) volume control has a
+30dB to –48dB range when speakers are driven and a
range of +13dB to –65dB when headphones are connected.
All amplifiers are protected by thermal shutdown. Addition-
ally, the high efficiency power amplifiers have output current
limit.
With a 8
Ω load, the IC’s efficiency for a 6W power level is
85%. The IC features click and pop reduction circuitry that
minimizes audible popping during device turn-on and turn-
off. The LM4681 is available in a 48-lead LLP package, ideal
for portable and desktop computer applications.
Key Specifications
n
P
O at THD+N =10%, AV = 30dB, VDD = 14V
10W (typ)
n
THD+N at 1kHz at 1W into 8
Ω (Power Amp) 0.43% (typ)
n
Efficiency at 7W into 8
85% (min)
n
Total quiescent power supply current
50mA (typ)
n
THD+N 1kHz, 20mW, 32
Ω (Headphone)
0.02% (typ)
n
Single supply range
9.0V to 15.5V
Features
n
Pulse-width modulator.
n
I
2C/SPI (selectable) volume control
n
Stereo headphone amplifier.
n
“Click and pop” suppression circuitry.
n
Micropower shutdown mode.
n
48 lead LLP package (No heatsink required).
Applications
n
Flat Panel Displays
n
Televisions
n
Multimedia Monitors
Block Diagram
20118922
Block Diagram for LM4681
BOOMERis a trademark of National Semiconductor Corporation.
March 2006
© 2006 National Semiconductor Corporation
DS201189
www.national.com




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