Maxim 公司的MAX9888是采用FLEXSOUND技術(shù)的全特性立體聲音頻CODEC，具有高性能和低功耗特性，特別適合用于手提設備。D類放大器為兩個揚聲器提供高效而低輻射的放大（每路950mW），不需要濾波器。集成的旁路開關(guān)可在D類放大器不使用時可使放大器直接連接到傳感器。MAX9888具有立體聲DirectDrive耳機放大器和差分接收放大器，雙路I2S/PCM/TDM 數(shù)字音頻接口。本文介紹了MAX9888主要特性，簡化方框圖和功能方框圖，以及麥克風輸入，線輸入，ADC輸入混合器，錄音通路信號處理，數(shù)字信號路由，數(shù)字帶通濾波，揚聲器放大器信號和處理處理等方框圖以及采用模擬麥克風輸入和旁路開關(guān)與數(shù)字麥克風輸入和接收放大器的典型應用電路圖。
100dB DR Stereo DAC (8kHz < fS < 96kHz)
91dB DR Stereo ADC (8kHz < fS < 96kHz)
Stereo Low EMI Class D Amplifiers 950mW/Channel (8I, VSPKVDD_ = 4.2V)
Stereo DirectDrive Headphone Amplifiers
Differential Receiver Amplifier
2 Stereo Single-Ended/Mono Differential Line Inputs
3 Differential Microphone Inputs
FLEXSOUND Technology
5-Band Parametric EQ
Automatic Level Control (ALC)
Excursion Limiter
Speaker Power Limiter
Speaker Distortion Limiter
Microphone Automatic Gain Control and Noise Gate
Dual I2S/PCM/TDM Digital Audio Interfaces
Asynchronous Digital Mixing
Supports Master Clock Frequencies from 10MHz to 60MHz
RF Immune Analog Inputs and Outputs
Extensive Click-and-Pop Reduction Circuitry
I2C Control Interface
63 WLP Package (3.80mm x 3.30mm, 0.4mm Pitch)
圖1。MAX9888簡化方框圖
圖2。MAX9888功能方框圖