مدار مجتمع (آی سی) آی‌سی صوتی ویژه

Product Attributes

Introduction

The CM108B is a highly integrated crystal-free USB audio single chip solution optimized for USB headset, headphone, and dongle applications. The CM108B comes with software driver interface which supports "Xear" sound effects for multimedia entertainments. All essential analog modules are embedded in the CM108B, including dual DAC and earphone driver, ADC, microphone booster, PLL, regulator and USB transceiver modules. Many features are programmable with jumper pins or by external EEPROM. Audio adjustments are easily controlled via specific HID-compliant volume control pins. An external codec or audio DSP can be connected to the CM108B via I2S pin for further processing. Vendors can customize unique USB VID/PID/Product String/Manufacture String and min/max/initial volumes to EEPROM. The CM108B also comes with an anti-pop noise circuits design and internal oscillator which can operate without an external crystal oscillator.

Features

• Compliant with USB 2.0 Full Speed Operation
• Compliant with USB Audio Device Class Specification v1.0
• Supports USB Suspend/Resume Mode and Remote Wakeup with Volume Control pins
• On-chip oscillator that provides reference sources for PLL and embedded USB transceiver
• Jumper pin for Headset Mode (Playback + Recording) and Speaker/Headphone Mode (Playback Only)
• Jumper pin for Mixer Unit enable/disable under Headset Mode and Power Mode setting
• I2S interfaces for external CODEC
• Anti-pop noise design for plugged and vice-versa
• Support Xear Audio Centre Software Driver for Windows OS
• Supports one control endpoint, one isochroous OUT endpoint, one isochroous IN endpoint, and one interrupt IN endpoint
• Alternate zero bandwidth setting for releasing playback bandwidth on USB Bus when device is inactive
• Supports AES/EBU, IEC60958, S/PDIF consumer formats for stereo PCM data at S/PDIF output
• Volume up, volume down, and playback mute pins support USB HID for host control synchronization
• Record mute pin with LED indicator for record mute status
• Includes external EEPROM Interface for Vendor Specific USB VID, PID, Product String, Manufacture String, and max/min/initial volumes
• 3 GPIO pins with read/write via HID interface
• Jumper pin to set the power mode (100mA or 500mA, Bus-powered or self-powered)
• Isochronous transfer uses adaptive mode with internal PLL for synchronization
• 48K/44.1KHz sampling rate for both playback and recording
• Soft mute function
• Embedded 16-bit ADC input with microphone