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LM4917SD Datasheet

  • LM4917SD

  • Ground-Referenced, 95mW Stereo Headphone Amplifier

  • 1205.21KB

  • 18頁

  • NSC

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LM4917 Ground-Referenced, 95mW Stereo Headphone Amplifier
November 2004
LM4917
Ground-Referenced, 95mW Stereo Headphone Amplifier
General Description
The LM4917 is a stereo, output capacitor-less headphone
amplifier capable of delivering 95mW of continuous average
power into a 16鈩?load with less than 1% THD+N from a
single 3V power supply.
The LM4917 provides high quality audio reproduction with
minimal external components. A ground referenced output
eliminates the output coupling capacitors typically required
by single-ended loads, reducing component count, cost and
board space consumption. This makes the LM4917 ideal for
mobile phones and other portable equipment where board
space is at a premium. Eliminating the output coupling ca-
pacitors also improves low frequency response.
The LM4917 operates from a single 1.4V to 3.6V power
supply, features low 0.02% THD+N and 70dB PSRR. Inde-
pendent right/left channel low-power shutdown controls pro-
vide power saving flexibility for mono/stereo applications.
Superior click and pop suppression eliminates audible tran-
sients during start up and shutdown. Short circuit and ther-
mal overload protection protects the device during fault con-
ditions.
Key Specifications
j
Improved PSRR at 1kHz
j
Power Output at V
DD
= 3V,
70dB (typ)
95mW (typ)
0.01碌A(chǔ) (typ)
R
L
= 16鈩? THD
%
1%
j
Shutdown Current
Features
Ground referenced outputs
High PSRR
Available in space-saving TSSOP package
Ultra low current shutdown mode
Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n
1.4 鈥?3.6V operation
n
No output coupling capacitors, snubber networks,
bootstrap capacitors
n
Shutdown either channel independently
n
n
n
n
n
Applications
n
n
n
n
n
Notebook PCs
Desktop PCs
Mobile Phone
PDAs
Portable electronic devices
Block Diagram
200893B8
FIGURE 1. Circuit Block Diagram
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2004 National Semiconductor Corporation
DS200893
www.national.com

LM4917SD 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Class-AB

  • 0.095 W x 2 at 16 Ohms

  • 2-Channel Stereo

  • 0.02 %

  • 3 V

  • + 85 C

  • LLP EP

  • Reel

  • 32 Ohms

  • Single

  • - 40 C

  • Single

  • Single

  • 3.6 V

  • 1.4 V

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