Wolfson公司的WM2200是低功耗具有增强的Wolfson myZoneTM环境噪音消除（ANC）的CODEC，为近端和远端用户提供了增强的语音质量。WM2200可以直接驱动耳机放大器，包括myZoneTM接收和发送通路的噪音消除和回声消除（AEC）算法，提供风噪音，电话机侧音和其它可编程的滤波器，多达6个模拟或数字麦克风，单端或差分模拟麦克风输入，AB类或W模式工作，主要用在移动手机。本文介绍了WM2200主要特性，方框图以及手持机模式和扬声器模式应用框图。
Low Power CODEC with Enhanced Wolfson myZoneTM Ambient Noise Cancellation
The WM2200 is a low power mobile CODEC with enhanced Wolfson myZoneTM Ambient Noise Cancellation (ANC). It provides enhanced voice communication quality for both near and far end handset users.
WM2200 drives the receiver earpiece speaker directly, includes myZoneTM receive path (RX) and transmit path (TX) Noise Cancellation and Acoustic Echo Cancellation (AEC) algorithms, and can be used in speakerphone mode using a PDM input speaker amplifier chip.
The device can be used for both narrowband and wideband voice calls and can be coupled with analogue and digital microphones. Baseband processors with analogue or digital voice RX and TX signals are supported.
The Wolfson myZoneTM (ANC) engine uses two or three analogue or digital microphones, allowing the enhanced filtering algorithm to consistently deliver the optimum noise cancellation performance.
The TX Noise Cancellation and Acoustic Echo Cancellation algorithms require one or two analogue or digital microphones.
The device is supplied via a single external 1.8V supply and requires an external clock (MCLK). It can be programmed via 2-wire serial control interface

WM2200主要特性：
Programmable audio effects and voice-processing functions
−myZoneTM adaptive ambient noise-cancellation for earpiece
−Transmit-path noise-cancellation and echocancellation
−Wind noise, side-tone and other programmable filters
Audio inputs
−Up to 6 analogue or digital microphones
−Single-ended or differential analogue microphone input
−1 single-ended or differential line input
Earpiece drivers
−Differential (BTL) drive configuration
−Class AB or W mode of operation
−-80dB THD at 20mW into 32Ω load
−DAC to earpiece SNR, AB mode (A-weighted)
>= 97dB
−Pop-click minimization
GPIO
DAC to ADC crosstalk better than 100dB
PDM digital output for speakerphone support
Digital Audio for digital RX and TX voice
Hearing Aid Coil
90-ball W-CSP package

WM2200应用：
Mobile telephony

图1。WM2200方框图

图2。WM2200手持机模式应用框图

图3。WM2200扬声器模式应用框图