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LM4930 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4930 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 33 page  LM4930 Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers General Description The LM4930 is an integrated audio subsystem that supports voice and digital audio functions. The LM4930 includes a high quality I 2S input stereo DAC, a voice band codec, a stereo headphone amplifier and a high-power mono speaker amplifier. It is primarily designed for demanding applications in mobile phones and other portable devices. The LM4930 features an I 2S serial interface for full range audio, a 16-bit PCM bi-directional serial interface for the voice band codec and an two-wire interface for control. The full range music path features an SNR of 86dB with a 16-bit 48kHz input. The stereo DAC can also be used while the voice codec is in use. The headphone amplifier delivers 25mW RMS toa32 Ω single-ended stereo load with less than 0.5% distortion (THD+N) when AV DD = 3V. The mono speaker amplifier delivers up to 300mW into an 8 Ω load with less than 2% distortion when AV DD =3V. The LM4930 employs advanced techniques to reduce power consumption, to reduce controller overhead and to eliminate click and pop. Boomer audio power amplifiers were de- signed 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 appli- cations where minimal power consumption is a primary re- quirement. Key Specifications j PH/P OUT at AVDD = 3.0V, 32 Ω 0.5% THD+N 25mW (typ) j PLS OUT at AVDD = 3.0V, 8 Ω 2% THD+N 300mW (typ) j Supply voltage range DV DD (Note 8) 2.6V to 4.5V AV DD (Note 8) 2.6V to 5.5V j Total shutdown current 2µA (typ) j PSRR at 217Hz, AVDD = 3V 50dB (typ) Features n 16-bit resolution 48kHz stereo DAC n 16-bit resolution 8kHz voice codec n I 2S digital audio data serial interface n Two-wire serial control interface n PCM voice audio data serial interface n 25mW/channel stereo headphone amplifier n 300mW mono 8 Ω amplifier (at AV DD = 3.0V) n 32-step volume control for audio output amplifiers n No snubber networks or bootstrap capacitors are required by the headphone or hands-free amplifiers n Digital sidetone generation with adjustable attenuation n Gain controllable headphone amp, mono BTL amp, mic preamp n Available in the 36 bump micro SMD package Applications n Mobile Phones n Mobile/low power audio appliances n PDAs Boomer® is a registered trademark of National Semiconductor Corporation. July 2003 © 2003 National Semiconductor Corporation DS200720 www.national.com |
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