CM109 Datasheet, PDF (5/36 Pages) C-Media Electronics – USB I/O Controller

CM109
High Integration / Low Cost USB Audio Controller
for PC Internet Phone
1.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.
VoIP applications are becoming increasing popular as VoIP can provide free or low-cost
calling worldwide. To provide a VoIP experience that is the same as using a regular phone
and eliminate the poor call quality that results from using the PC audio, C-Media has
developed CM109 USB Controller that enables a regular phone, handset, or headset
which is interfaced to the USB port on the PC. With the C-Media OEMs can quickly bring
to market a family of low cost high quality VoIP products.
2. FEATURES
z Compliant with USB 2.0 Full Speed Operation
z Compliant with USB Audio Device class specification v1.0
z Supports USB Suspend/Resume Mode and remote Wakeup with Volume Control
pins
z Single 12MHz Crystal input with on-chip PLL and embedded USB transceiver
z Jumper Pin for Speaker Mode (Playback Only) or Headset Mode (Playback +
Recording)
z For Headset Mode, USB audio function topology has 2 Input Terminals, 2 Output
Terminals, 1 Mixer Unit, 1 Selector Unit, and 3 Feature Units
z Jumper Pin for Operation System Mixer Unit Enable/Disable under Headset Mode
Date: 08/Sep/2005
-4-
Version: 1.3a