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(shè)備。D類(lèi)放大器為兩個(gè)揚(yáng)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(kāi)關(guān)可在D類(lèi)放大器不使用時(shí)可使放大器直接連接到傳感器。MAX9888具有立體聲DirectDrive耳機(jī)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(jiǎn)化方框圖和功能方框圖，以及麥克風(fēng)輸入，線(xiàn)輸入，ADC輸入混合器，錄音通路信號(hào)處理，數(shù)字信號(hào)路由，數(shù)字帶通濾波，揚(yáng)聲器放大器信號(hào)和處理處理等方框圖以及采用模擬麥克風(fēng)輸入和旁路開(kāi)關(guān)與數(shù)字麥克風(fēng)輸入和接收放大器的典型應(yīng)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(jiǎn)化方框圖
圖2。MAX9888功能方框圖