CM108B Datasheet, PDF (9/24 Pages) C-Media Electronics – A Highly Integrated USB Audio Single Chip

5 Block diagram
CM108B
USB Audio Single Chip
PWRSEL
MODE
AREG36 DREG33 DREG18 ^PDSW MSEL
3.6V 3.3V 1.8V
Regulator
5->3.6, 3.3 & 1.8
DW
DR
SK
SPI
CS
EEPROM
Interface
USBDP
USBDN
USB
USB TRX
USB
Interface
RF
PLL
48M
12M
VOLUP
VOLDN
MUTER
MUTEP
DASCLK/ADSCLK
DALRCK/ADLRCK
LEDO
DAMCLK/ADMCLK
LEDR GPIOs SDOUT/SDIN
Interface Logics
I2S Out/In
USB Control
ISO Out
Processing
16 bit
DAC
16 bit
DAC
VREF
0 ~ -45dB
0 ~ -45dB
ISO In
Processing
SRAM
16 bit
ADC
VREF
8 ~ -22dB
23 ~ -22dB
12dB/22dB
Booster
bandgap
LOBS
LOR
LOL
MICI
N
VREF
(1.75V)
VBIAS
(3V)
CM108B Block Diagram
Datasheet Revision: 1.11
Page 9 / 24
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