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.
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