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Maxim 公司的MAX98089是帶揚聲器保護的高性能低功耗的音頻CODEC,具有101dB DR的立體聲DAC(8kHz The MAX98089 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 com-pletely filterless operation. Integrated bypass switches optionally connect an external amplifier to the transducer when the Class D amplifiers are disabled. The IC features a stereo Class H headphone amplifier that utilizes a dual-mode charge pump to maximize effi-ciency while outputting a ground referenced signal that does not require output coupling capacitors. The IC also features a mono differential amplifier that can also be configured as a stereo line output. Two differential analog microphone inputs are available as well as support for two PDM digital microphones. Integrated switches allow for an additional microphone input as well as 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 loudspeak-er performance by optimizing the signal level and fre-quency 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. MAX98089主要特性: 5.6mW Power Comsumption (DAC to HP at 97dB DR) 101dB DR Stereo DAC (8kHz < fS < 96kHz) 93dB DR Stereo ADC (8kHz < fS < 96kHz) Stereo Low EMI Class D Amplifiers 1.7W/Channel (8I, VSPK_VDD = 5.0V) 2.9W/Channel (4I, VSPK_VDD = 5.0V) Efficient Class H Headphone Amplifier Differential Receiver Amplifier/Stereo Line Outputs 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 Available in 63-Bump WLP Package (3.80mm x 3.30mm, 0.4mm Pitch) and 56-Pin TQFN Package (7mm x 7mm x 0.75mm) 
圖1.MAX98089方框圖
圖2.MAX98089揚聲器信號處理方框圖
圖3.MAX98089采用模擬麥克風(fēng)輸出和旁路開關(guān)的應(yīng)用電路圖
圖4.MAX98089采用數(shù)字麥克風(fēng)輸出和接收放大器的應(yīng)用電路 MAX98089評估板 The MAX98089 evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX98089 audio codec. The IC is an integrated audio codec includ-ing microphone amplifiers, line amplifiers, an earpiece amplifier, stereo Class D amplifiers, stereo DirectDriveM headphone amplifiers, and digital signal processing. The EV kit also includes Windows XPM-, Windows VistaM-, and WindowsM 7-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the IC. The EV kit provides access to all analog and digital inputs/outputs on the IC. To enable easy connection to a wide range of audio sources, audio devices are included to convert both USB data and S/PDIF data to I2S. The EV kit integrates a MAXQ2000 microcontroller to enable I2C communication with devices on the EV kit. The EV kit software, running on a Windows PC, commu-nicates with the EV kit over a standard USB port. The EV kit software provides an intuitive interface to exercise the functions of the IC. The EV kit comes with a MAX98089EWY+ installed. MAX98089評估板主要特性: 2.8V to 5.5V Single-Supply Operation Proven Audio PCB Layout On-Board USB-to-I2C Interface Circuit On-Board USB-to-I2S Converter On-Board S/PDIF Transceiver On-Board Clock Source On-Board Digital Microphone Evaluates the MAX98089EWY+ in a 3.8mm x 3.3mm, 63-Bump WLP Package Windows XP-, Windows Vista-, and Windows 7-Compatible Software Proven PCB Layout Fully Assembled and Tested
圖5.MAX98089評估板簡化方框圖
圖6.MAX98089評估板軟件主窗口 (Block Diagram Tab)
圖7.MAX98089評估板電路圖(1)
圖8.MAX98089評估板電路圖(2)
圖9.MAX98089評估板電路圖(3)
圖10.MAX98089評估板電路圖(4)
圖11.MAX98089評估板電路圖(5) MAX98089評估板材料清單:
圖12.MAX98089評估板元件布局圖 詳情請見: http://datasheets.maxim-ic.com/en/ds/MAX98089.pdf 和 http://datasheets.maxim-ic.com/en/ds/MAX98089EVKIT.pdf |
