骅讯电子的CM6327A系列，提供完整USB麦克风单芯片解决方案。高整合单芯片可简化周边料件成本、降低开发时程，及实现高品质录音功能。适用于各种游戏主机或是PC平台时，可呈现稳定的高品质音效，满足中高阶与客制化产品应用。搭配骅讯电子研发的PC卡拉OK软件引擎，更可实现回音加强系统、人声消除、歌曲升降KEY调整、魔音效果技术等。

骅讯电子亦提供业界最完整的USB耳机音频单芯片解决方案CM6300/CM6308/CM108AH系列。嵌入式高音质放大器提供独立的44.1/48k取样回路，可呈现更佳的音效品质, 除此之外, 骅讯电子亦提供一套加值软件程序，其整合骅讯电子研发之噪声消除、回音消除引擎、以及各种麦克风数组功能。并提供3D音效定位技术，将可完美呈现7.1声道环绕音场，以及提供杜比与DTS相关的技术，让使用者体验全新不同的享受。

骅讯电子PCI接口音效处理解决方案，将提供音乐升降Key、消除原唱声、及麦克风回音、魔幻语音等音效处理技术，让升级声卡的使用者享受加值的功能娱乐，并可适用于线上Karaoke及VOIP等应用。 针对游戏玩家，骅讯在高阶音效芯片上开发出Xear3D EX (Extensions) 游戏音效引擎，可以让玩家在Windows Vista，甚至将来的Windows 7上享受传统DirectX游戏多声道3D环绕、EAX 2、Dolby Digital Live, DTS Connect等，以及一般声卡无法提供的音场效果。

Introduction

CM6327A is a highly integrated single chip USB audio solution which comprises more USB audio controller and applications. According to coming more experiences in PC USB Audio peripheral from Vendors’ recommend, Cmedia aggressively design one single chip to let vendors to come more integration products, and increase more revenues.

CM6327A contains high performance mono ADC, and have verious interface like I2C, allowing all kinds of microprocessor or DSP to communicate. Especially in advanced VOIP applications. CM6327A could give you low noise and high quality speech input solution, thus, when it comes to conference or public speech, it would be wonderful choice for you.

Also, CM6327A integrates all essential analog, 1CH ADC, PLL, regulator, USB transceiver, with external EEPROM to customize your own product string, PID and VID , 8/11/16/22/32/44.1/48KHz sampling rate and high quality 16-bit resolution and friendly general purpose inputs and outputs(GPIO) connect the CM6327A to peripheral hardware, like LED, keypads and buttons, there are many features could be programmable with external EEPROM and MCU. External MCU/EEPROM could be easily controlled via HID software interface. 2 LED indicator pins supported provide more flexible behavior with device on / off / operation / recording mute / and controllable flash time.

Product benefit
Highly integrated single chip USB microphone solution
Electrical Noise Immunity via USB Digital Link
Flexible interface to extent application field
Provide Microsoft Vista premium logo requirement
Flexible descriptor option by external EEPROM
Product features
USB specification 2.0 Full speed compatible and USB IF certification
USB audio device class specification 1.0 and USB HID class specification 1.1 compliant
Support control, interrupt and isochroous data transfers
USB suspend/resume and remote wake-up supported
Embedded USB transceiver and power-on reset circuit
Single 12MHz Crystal Input with On-chip PLL
High-power (500mA) and Low-power (100mA) mode options supported
Support series number string for operation system detect
Serial EEPROM programming interface supports customized VID/PID/Product string/ Manufacture string for device name changed and configuration
EEPROM interface support 24C02 data format
Mono ADC Input
ADC sampling rate 8K / 11.025K / 16K / 22.05K / 32K / 44.1K / 48K Hz, 16-bit resolution
Dynamic Range: 96db, THD+N: -89~96db
Digital Linear Microphone Gain Control function (-16db~45db)
1.0 Vrms input swing biased at 2.25V
Support Microsoft HID functions
Support I2C (Master/Slave) control interface for external controller used
I2C MCU read/write support 16 bytes data transfer bandwidth
I2C interface support extra interrupt pin (INT)
MCU / EEPROM / GPIO control via HID / Vender command interface
USB audio topology has 1 Input Terminals, 1 Output Terminals, 1 Selector Unit, and 1 Feature Unit
Support 2 LED indicator pins:
On / Off / Operation
Recording mute
Support 8 GPIO and 3GPI Pins
Isochronous transfer uses Adaptive Mode with Internal PLL for Synchronization
Embedded Power-On-Reset Block
Single 5V power supply with embedded 5V to 3.3V regulator
Industry standard LQFP-48 Pin package
Compatible with Win2000 / WinXP / Vista / MAC / OSX / Linux
Support Hardware SDK tool for third-party software development