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Audio Sub-Sys w/ Dual-Mode Stereo Headphone Mono High Efficiency Loudspkr Amps & Multi-Purpose ADC


Package | PIN: YPG | 49
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $8.96
10-24 $8.06
25-99 $7.53
100-249 $6.75
250-499 $6.30
500-749 $5.48
750-999 $4.74
1000+ $4.65


  • 18-Bit Stereo DAC
  • 16-Bit Mono ADC
  • 12-Bit 4 Input Multipurpose SAR ADC
  • 8 kHz to 48 kHz Stereo Audio Playback
  • 8 kHz to 48 kHz Mono Recording
  • 1 Hz to 13.888 kHz Sample Rate on all 4 SAR Channels
  • Bidirectional PCM/I2S Compatible Audio Interface
  • Sigma-Delta PLL for Operation from any Clock at any Sample Rate
  • Low Power Clock Network Operation if 12 MHz System Clock is Available
  • Read/write I2C or SPI Compatible Control Interface
  • 33mW Stereo Headphone Amplifier at 3.3V
  • OCL or AC-coupled Headphone Operation
  • Automatic Headphone & Microphone Detection
  • Support for Internal and External Microphones
  • Automatic Gain Control for Microphone Input
  • High Efficiency BTL 8Ω Amplifier, 600 mW @ 3.3V
  • 115 mW Earpiece Amplifier at 3.3V
  • Differential Audio I/O for External Cellphone Module
  • Mono Differential Auxiliary Output
  • Stereo Auxiliary Inputs
  • Differential Microphone Input for Internal Microphone
  • Flexible Audio Routing from Input to Output
  • 32 Step Volume Control for Mixers with 1.5 dB Steps
  • 16 Step Volume Control for Microphone in 2 dB Steps
  • Programmable Sidetone Attenuation in 3 dB Steps
  • DC Volume Control
  • Two Configurable GPIO Ports
  • Programmable Voltage Triggers on SAR Channels
  • Multi-function IRQ Output
  • Micro-power Shutdown Mode
  • Available in the 4 x 4 mm 49-Bump DSBGA Package

Key Specifications

  • PHP (AC-COUP) @ A_VDD = 3.3V, 32Ω, 1% THD: 33 mW
  • PHP (OCL) @ A_VDD = 3.3V, 32Ω, 1% THD: 31 mW
  • PLS @ LS_VDD = 5V, 8Ω, 1% THD: 1.3 W
  • PLS @ LS_VDD = 4.2V, 8Ω, 1% THD: 900 mW
  • Supply Voltage Range
    • BB_VDD = 1.8V to 4.5V,
    • D_VDD & PLL_VDD = 2.7V to 4.5V
    • LS_VDD & A_VDD = 2.7V to 5.5V
  • PLS @ LS_VDD = 3.3V, 8Ω, 1% THD: 600 mW
  • Shutdown Current: 1.1 µA
  • PSRR @ 217 Hz, A_VDD = 3.3V, (Headphone): 60 dB
  • SNR (Stereo DAC to AUXOUT): 88 dB (typ)
  • SNR (Mono ADC from Cell Phone In): 90 dB (typ)
  • SNR (Aux In to Headphones): 98 dB (typ)

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Texas Instruments  LM4935RL/NOPB

The LM4935 is an integrated audio subsystem that supports both analog and digital audio functions. The LM4935 includes a high quality stereo DAC, a mono ADC, a multi-purpose SAR ADC, a stereo headphone amplifier, which supports output cap-less (OCL) or AC-coupled (SE)modes of operation, a mono earpiece amplifier and a mono high efficiency loudspeaker amplifier. It is designed for demanding applications in mobile phones and other portable devices.

The LM4935 features a bi-directional I2S serial interface for full range audio and anI2C or SPI compatible interface for control. The stereo DAC path features an SNR of 88 dB with an 18-bit 48 kHz input. In SE mode the headphone amplifier delivers at least 33 mWRMS to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The mono earpiece amplifier delivers at least 115 mWRMS to a 32Ω bridged-tied load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The mono speaker amplifier delivers up to 600 mW into an 8Ω load with less than 1% distortion when LS_VDD = 3.3V and up to 1.3W when LS_VDD = 5.0V. The LM4935 also contains a general purpose SAR ADC for housekeeping duties such as battery and temperature monitoring. This can also be used for analog volume control of the output stages and can trigger interrupt events.

The LM4935 employs advanced techniques to reduce power consumption, to reduce controller overhead to speed development time and to eliminate click and pop. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. It is therefore ideally suited for mobile phone and other low voltage applications where minimal power consumption, PCB area and cost are primary requirements.