CM108 Datasheet, PDF (12/29 Pages) C-Media Electronics – USB Audio I/O Controller

CM108
Integration Dual DAC, Earphone Driver, ADC,
Microphone Booster, PLL, Regulator, and USB Transceiver
5. BLOCK DIAGRAM
REGV
PWRSEL
MODE
PDSW MSEL
5 -> 3.3
regulator
3.3V
CS
SK
DW
DR
USBDP
USBDM
EEPROM
interface
USB
TRX
USB
interface
12 MHz
48 MHz
PLL1
clock
gen
VOLUP
VOLDN
MUTER LEDO
MUTEP LEDR GPIO
SPDIFO
USB control
interface logics
ISO out
processing
ISO in
processing
SRAM
reset power on
reset
16 bit
DAC
16 bit
DAC
VREF ⁺
0 ~ -45dB
38 steps
0 ~ -45dB
38 steps
LOBS
LOL
LOR
16 bit ADC
+12 ~ -33 dB
32 steps
+22.5 ~ 0 dB
16 steps
MICIN
+20dB boost enable
VREF
(2.25V)
IIS I/F
bandgap
4.5V
VREF
VBIAS
Block Diagram Of CM108
Date: Nov/01/2004
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Version: 1.5