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홈 > 제품정보 > C-MEDIA
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CM108: USB Audio I/O Controller
 
| Overview |
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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. For
value added application, external codec or audio DSP can be connected to CM108
via I2S pin for further processing. 4 GPIO pins can be accessed with customer
application software for additional value added application.
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Features |
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Compliant with USB 2.0 full
speed operation |
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Compliant with USB audio device
class specification v1.0 |
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Supports USB suspend/resume mode
and remote wakeup with volume control pins |
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Single 12MHz crystal input with
on-chip PLL and embedded USB transceiver |
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Jumper pin for speaker mode
(playback only) or headset mode (playback + recording) |
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For headset mode, USB audio
function topology has 2 input terminals, 2 output terminals, 1mixer unit, 1
selector unit, and 3 feature units |
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Jumper pin for mixer unit
enable/disable under headset mode |
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For speaker mode, USB audio
function topology has 1 input terminal, 1 output terminal, and 1 feature
unit |
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Support one control endpoint, one
isochronous out endpoint, one isochronous in endpoint, and one interrupt in
endpoint |
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Alternate zero bandwidth setting
for releasing playback bandwidth on USB bus when this device is
inactive |
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Volume up, volume down, and
playback mute support USB HID for host control synchronization |
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Record mute pin with LED
indicator for record mute status |
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External EEPROM interface for
vendor specific USB VID, PID, and serial number |
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EEPROM write function via vendor
specific request for mass production convenience |
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Customized embedded VID, PID, and
product string by customer request |
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4 GPIO pins with read/write via
HID |
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S/PDIF output interface | | |
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