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Maxim 公司的MAX9888是接纳FLEXSOUND技能的全特点立体声音频CODEC，具有高性能和低功耗特点，特别适适用于手提设备。D类放大器为两个扬声器提供高效而低辐射的放大（每路950mW），不需要滤波器。集成的旁路开关可在D类放大器不使用时可使放大器直接毗连到传感器。MAX9888具有立体声DirectDrive耳机放大器和差分吸收放大器，双路I2S/PCM/TDM 数字音频接口。本京电港论坛文章先容了MAX9888主要特点，简化方框架图和功能方框架图，以及麦克风输入，线输入，ADC输入混淆器，灌音通路信号处理，数字信号路由，数字带通滤波，扬声器放大器信号和处理处理等方框架图以及接纳模拟麦克风输入和旁路开关与数字麦克风输入和吸收放大器的典范应用电路原理图纸。 Stereo Audio CODEC with FLEXSOUND Technology The MAX9888 is a full-featured audio CODEC whose high performance and low power consumption make it ideal for portable applications. Class D speaker amplifiers provide efficient amplification for two speakers. Low radiated emissions enable completely filterless operation. Integrated bypass switches optionally connect an external amplifier to the transducer when the Class D amplifiers are disabled. DirectDrive® headphone amplifiers provide a true ground-referenced output, eliminating the need for large DC-blocking capacitors. 1.8V headphone operation ensures low power consumption. The device also includes a differential receiver amplifier. Three differential analog microphone inputs are available as well as support for two PDM digital microphones. Integrated switches allow microphone signals to be routed out to external devices. Two flexible single-ended or differential line inputs may be connected to an FM radio or other sources. Integrated FLEXSOUNDK technology improves loudspeaker performance by optimizing the signal level and frequency response while limiting the maximum distortion and power at the output to prevent speaker damage. Automatic gain control (AGC) and a noise gate optimize the signal level of microphone input signals to make best use of the ADC dynamic range. The device is fully specified over the -40NC to +85NC extended temperature range. MAX9888主要特点： 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) |
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