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LM4937TL Datasheet

  • LM4937TL

  • National Semiconductor [Audio Sub-System with OCL Stereo He...

  • NSC

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LM4937 Audio Sub-System with OCL Stereo Headphone Output and RF Suppression
February 2007
LM4937
Audio Sub-System with OCL Stereo Headphone Output
and RF Suppression
General Description
The LM4937 is an integrated audio sub-system designed for
mono voice, stereo music cell phones connecting to base
band processors with mono differential analog voice paths.
Operating on a 3.3V supply, it combines a mono speaker am-
plifier delivering 520mW into an 8鈩?load, a stereo headphone
amplifier delivering 36mW per channel into a 32鈩?load, and
a mono earpiece amplifier delivering 55mW into a 32鈩?load.
It integrates the audio amplifiers, volume control, mixer, and
power management control all into a single package. In ad-
dition, the LM4937 routes and mixes the single-ended stereo
and differential mono inputs into multiple distinct output
modes. The LM4937 features an I
2
S serial interface for full
range audio and an I
2
C or SPI compatible interface for control.
The full range music path features an SNR of 85dB with an
18-bit 48kHz input.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components.
Key Specifications
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P
OUT
, BTL, 8鈩? 3.3V, 1%
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P
OUT
H/P, 32鈩? 3.3V, 1%
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P
OUT
Mono Earpiece, 32鈩?
1%
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Shutdown current
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SNR (DAC + Amplifier)
520mW (typ)
36mW (typ)
55mW (typ)
0.6碌A(chǔ) (typ)
85dB (typ)
Features
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18-bit stereo DAC
Multiple distinct output modes
Mono speaker amplifier
Stereo headphone amplifier
Mono earpiece amplifier
Differential mono analog input
Independent loudspeaker, headphone and mono earpiece
volume controls
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I
2
C/SPI (selectable) compatible interface
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Ultra low shutdown current
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Click and Pop Suppression circuit
Applications
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Cell Phones
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PDAs
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
202020
www.national.com

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