DESCRIPTIONS AND OVERVIEW
CM109 is a highly integrated single chip USB audio controller specifically for VoIP (Voice over internet protocol) application. All essential analog modules are embedded in CM109, including dual DAC and earphone driver, ADC, microphone booster, PLL, regulator, and USB transceiver. 8 GPIO pins can constitute a 24 key matrix directly support keypad control function without MCU. It’s also support buzzer output pin for VoIP application. In addition, audio adjustment can be easily controlled via specific HID compliant volume control pins. Many features are programmable with jumper pins or external EEPROM. Vender can customized unique USB VID/PID to EEPROM for VoIP software authentication. Moreover, individual unique phone number for each device is possible via serial number stored in external EEPROM. Moreover, CM109 provided I2C interface with MCU application for LCM integrated and advanced functions.

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
● Single 12MHz Crystal input with on-chip PLL and embedded USB transceiver
● Jumper Pin for Speaker Mode (Playback Only) or Headset Mode (Playback + Recording)
● For Headset Mode, USB audio function topology has 2 Input Terminals, 2 Output Terminals, 1 Mixer Unit, 1 Selector Unit, and 3 Feature Units
● Jumper Pin for Operation System Mixer Unit Enable/Disable under Headset Mode
● For Speaker Mode, USB audio function topology has 1 Input Terminal, 1 Output Terminal, and 1 Feature Unit
● Support 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 this device is inactive
● Volume up, volume down, and playback mute support USB HID for Host Control Synchronization
● Record Mute Pin with LED Indicator for Record Mute Status
● External EEPROM Interface for Vendor Specific USB VID, PID, and Serial Number
● Supports AES/EBU, IEC60958, S/PDIF Consumer Formats for Stereo PCM Data at S/PDIF Output
● 8 GPIO Pins with Read/Write via HID
● Embedded Buzzer Function controlled by Register
● Support I2C Interface for External MCU Integrated
● Jumper Pin for Output Voltage Swing (3.5V or 2.5V)
● Jumper Pin for Power Mode Setting
● Isochroous transfer uses Adaptive Mode with Internal PLL for Synchronization
● 48K/44.1KHz Sampling Rate for both Playback and Recording
● Soft Mute Function
● Embedded High Performance 16 bit audio DAC with Earphone Phone Buffer
● Host side data loss noise reduction function
● Embedded 16 bit ADC input with Microphone Boost
● Embedded power on Reset Block
● Embedded 5V to 3.3V regulator for single External 5V Operation
● Compatible with Win98 SE / Win ME / Win 2000 / Win XP and Mac OS9 / OS X without Additional Driver
● 48 Pin LQFP Package
● Support Hardware SDK tool for third-party software or soft-phone development