DESCRIPTION

The CM108AH is a highly integrated single-chip USB audio solution.All essential analog modules are embedded in the CM108AH,including dual DAC and earphone driver,ADC,microphone booster,PLL,regulator and USB transceiver modules.It is perfectly suited to USB headset,USB earphone or USB audio-interface box applications.As well,

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 CM108AH via I2S pin for further processing.

FEATURES

Supports USB 2.0 full speed operation

Compliant with USB audio device class specification 1.0

Supports USB suspend/resume modes 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 plus 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 allows for mixer unit enable/disable when in headset mode