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LM4937

OBSOLETE

1.25-W, mono Class-D audio amp with 175-mW earpiece amp & 80-mW stereo headphone amp

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Data sheet

LM4937

OBSOLETE
Data sheet Order now

Product details

Rating Catalog Control interface I2C, SPI Sampling rate (max) (kHz) 192 Operating temperature range (°C) -40 to 85
Rating Catalog Control interface I2C, SPI Sampling rate (max) (kHz) 192 Operating temperature range (°C) -40 to 85
DSBGA (YPG) 36 10.5625 mm² 3.25 x 3.25
  • 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

Key Specifications

  • POUT, BTL, 8Ω, 3.3V, 1%: 520 mW (typ)
  • POUT H/P, 32Ω, 3.3V, 1%: 36 mW (typ)
  • POUT Mono Earpiece, 32Ω, 1%: 55 mW (typ)
  • Shutdown current: 0.6µA (typ)
  • SNR (DAC + Amplifier): 85 dB (typ)

All trademarks are the property of their respective owners. Boomer is a trademark of Texas Instruments.

  • 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

Key Specifications

  • POUT, BTL, 8Ω, 3.3V, 1%: 520 mW (typ)
  • POUT H/P, 32Ω, 3.3V, 1%: 36 mW (typ)
  • POUT Mono Earpiece, 32Ω, 1%: 55 mW (typ)
  • Shutdown current: 0.6µA (typ)
  • SNR (DAC + Amplifier): 85 dB (typ)

All trademarks are the property of their respective owners. Boomer is a trademark of Texas Instruments.

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.

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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Technical documentation

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* Data sheet LM4937 Audio Sub-System with OCL Stereo Headphone Output and RF Suppression datasheet (Rev. J) 01 May 2013

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