LM4937 Datasheet, PDF (1/41 Pages) Texas Instruments – Audio Sub-System with OCL Stereo Headphone Output and RF Suppression

LM4937
www.ti.com
SNAS369J – OCTOBER 2006 – REVISED MAY 2013
LM4937
Audio Sub-System with OCL Stereo Headphone
Output and RF Suppression
Check for Samples: LM4937
FEATURES
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•234 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
• I²C/SPI (Selectable) Compatible Interface
• Ultra Low Shutdown Current
• Click and Pop Suppression Circuit
APPLICATIONS
• Cell Phones
• PDAs
KEY SPECIFICATIONS
• P_OUT, BTL, 8Ω, 3.3V, 1%: 520 mW (typ)
• P_OUT H/P, 32Ω, 3.3V, 1%: 36 mW (typ)
• P_OUT Mono Earpiece, 32Ω, 1%: 55 mW (typ)
• Shutdown current: 0.6µA (typ)
• SNR (DAC + Amplifier): 85 dB (typ)
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 amplifier
delivering 520mW into an 8Ω load, a stereo
headphone amplifier delivering 36mW per channel
into a 32Ω load, and a mono earpiece amplifier
delivering 55mW into a 32Ω load. It integrates the
audio amplifiers, volume control, mixer, and power
management control all into a single package. In
addition, the LM4937 routes and mixes the single-
ended stereo and differential mono inputs into
multiple distinct output modes. The LM4937 features
an I²S serial interface for full range audio and an I²C
™or SPI compatible interface for control. The full
range music path features an SNR of 85dB with a
192kHz playback.
Boomer™ audio power amplifiers are designed
specifically to provide high quality output power with a
minimal amount of external components.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Boomer is a trademark of Texas Instruments.
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I²C is a trademark of NXP.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2013, Texas Instruments Incorporated