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LM4935 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4935 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 112 page  LM4935 Audio Sub-System with Dual-Mode Stereo Headphone & Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC 1.0 General Description The LM4935 is an integrated audio subsystem that supports both analog and digital audio functions. The LM4935 in- cludes 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 effi- ciency loudspeaker amplifier. It is designed for demanding applications in mobile phones and other portable devices. The LM4935 features a bi-directional I 2S serial interface for full range audio and an I 2C 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 mW RMS toa32 Ω single-ended stereo load with less than 1% distortion (THD+N) when A_V DD = 3.3V. The mono earpiece amplifier delivers at least 115 mW RMS toa32 Ω bridged-tied load with less than 1% distor- tion (THD+N) when A_V DD = 3.3V. The mono speaker am- plifier delivers up to 600 mW into an 8 Ω load with less than 1% distortion when LS_V DD = 3.3V and up to 1.3W when LS_V DD = 5.0V. The LM4935 also contains a general pur- pose 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 devel- opment 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 com- ponents. It is therefore ideally suited for mobile phone and other low voltage applications where minimal power con- sumption, PCB area and cost are primary requirements. 2.0 Applications n Smartphones n Mobile Phones and Multimedia Terminals n PDAs, Internet Appliances and Portable Gaming n Portable DVD/CD/AAC/MP3 Players n Digital Cameras/Camcorders 3.0 Key Specifications n P HP (AC-COUP) @ A_VDD = 3.3V, 32 Ω, 1% THD 33 mW n P HP (OCL) @ A_VDD = 3.3V, 32 Ω, 1% THD 31 mW n P LS @ LS_VDD =5V, 8 Ω, 1% THD 1.3 W n P LS @ LS_VDD = 4.2V, 8 Ω, 1% THD 900 mW n P LS @ LS_VDD = 3.3V, 8 Ω, 1% THD 600 mW j Supply Voltage Range BB_V DD = 1.8V to 4.5V, D_V DD & PLL_VDD = 2.7V to 4.5V LS_V DD & A_VDD = 2.7V to 5.5V n Shutdown Current 1.1 µA n PSRR @ 217 Hz, A_V DD = 3.3V, (Headphone) 60 dB n SNR (Stereo DAC to AUXOUT) 88 dB (typ) n SNR (Mono ADC from Cell Phone In) 90 dB (typ) n SNR (Aux In to Headphones) 98 dB (typ) 4.0 Features n 18-bit stereo DAC n 16-bit mono ADC n 12-bit 4 input multipurpose SAR ADC n 8 kHz to 48 kHz stereo audio playback n 8 kHz to 48 kHz mono recording n 1 Hz to 13.888 kHz sample rate on all 4 SAR channels n Bidirectional PCM/I 2S compatible audio interface n Sigma-Delta PLL for operation from any clock at any sample rate n Low power clock network operation if 12 MHz system clock is available n Read/write I 2C or SPI compatible control interface n 33mW stereo headphone amplifier at 3.3V n OCL or AC-coupled headphone operation n Automatic headphone & microphone detection n Support for internal and external microphones n Automatic gain control for microphone input n High efficiency BTL 8 Ω amplifier, 600 mW @ 3.3V n 115 mW earpiece amplifier at 3.3V n Differential audio I/O for external cellphone module n Mono differential auxiliary output n Stereo auxiliary inputs n Differential microphone input for internal microphone n Flexible audio routing from input to output n 32 Step volume control for mixers with 1.5 dB steps n 16 Step volume control for microphone in 2 dB steps n Programmable sidetone attenuation in 3 dB steps n DC Volume Control n Two configurable GPIO ports n Programmable voltage triggers on SAR channels n Multi-function IRQ output n Micro-power shutdown mode n Available in the4x4mm49 bump microfil package Boomer® is a registered trademark of National Semiconductor Corporation. October 2005 © 2005 National Semiconductor Corporation DS201341 www.national.com |
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