LM4930 - 具有立体声耳机和单声道扬声器放大器的音频子系统

LM4930是TI德州仪器公司的一款音频编解码器产品，LM4930是具有立体声耳机和单声道扬声器放大器的音频子系统，本站介绍了LM4930的封装应用图解、特点和优点、功能等，并给出了与LM4930相关的TI元器件型号供参考。

LM4930 - 具有立体声耳机和单声道扬声器放大器的音频子系统 - 音频编解码器 - 音频转换器 - 德州仪器

产品描述

The LM4930 is an integrated audio subsystem that supports voice and digital audio functions. The LM4930 includes a high quality I2S 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 I2S 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 25mWRMS to a 32? single-ended stereo load with less than 0.5% distortion (THD+N) when AVDD = 3V. The mono speaker amplifier delivers up to 330mW into an 8? load with less than 1% distortion when AVDD = 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 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 is a primary requirement.

产品特性

16-bit Resolution 48kHz Stereo DAC
16-bit Resolution 8kHz Voice Codec
I2S Digital Audio Data Serial Interface
Two-wire Serial Control Interface
PCM Voice Audio Data Serial Interface
25mW/channel Stereo Headphone Amplifier
330mW Mono 8? Amplifier (at AVDD = 3.0V)
32-step Volume Control for Audio Output Amplifiers
No Snubber Networks or Bootstrap Capacitors are Required by the Headphone or Hands-free Amplifiers
Digital Sidetone Generation with Adjustable Attenuation
Gain Controllable Headphone Amp, Mono BTL Amp, Mic Preamp
Available in the 36–bump DSBGA and 44–lead WQFN Packages

Key Specifications

PLS OUT at AVDD = 5.0V, 8Ω 1% THD+N 1W (typ)
PLS OUT at AVDD = 3.0V, 8Ω 1% THD+N 330mW (typ)
PH/P OUT at AVDD = 3.0V, 32Ω 0.5% THD+N 25mW (typ)
Supply Voltage Range
- DVDD 2.6V to 4.5V
- AVDD 2.6V to 5.5V
Total Shutdown Current 2μA (typ)
PSRR at 217Hz, AVDD = 3V 50dB (typ)

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