CM108

 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 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 isochronous out endpoint, one isochronous 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
EEPROM write function via vendor specific request for mass production convenience
Customized embedded VID, PID, and product string by customer request
4 GPIO pins with read/write via HID
S/PDIF output interface
Jumper pin for output voltage swing (3.5V or 2.5V)
Jumper pin for power mode setting
Isochronous 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
I²S interface for external ADC, DAC, or DSP.
Adopt BTL Type for analog output, earphone unit direct connection without capacitor
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

CM108 is a highly integrated single chip USB audio solution. All essential analog modules are embedded in CM108, including dual DAC and earphone driver, ADC, microphone booster, PLL,regulator, and USB transceiver. It is very suitable for USB headset, USB earphone or USB audio interface box application. Many features are programmable with jumper pins or external EEPROM. In addition, audio adjustment can be easily controlled via specific HID compliant volume control pins.Better yet, CM108 to adopt BTL type for analog output which can saving one capacitor. For value added application, external codec or audio DSP can be connected to CM108 via IIS pin for further processing.4 GPIO pins can be accessed with customer application software for more flexible application.