CM108AH Datasheet, PDF (9/27 Pages) C-Media Electronics – Highly Integrated USB Audio I/O Controller

CM108AH
Highly Integrated USB Audio I/O Controller
5 Block Diagram
REGV
PWRSEL
MODE
PDSW SEL pins
VOLUP
VOLDN
MUTER LEDO MCU
MUTEP LEDR I/F GPIO BUZZ SPDIFO
CS
SK
DW
DR
USBDP
USBDM
XI
XO _{12 MHz}
5- > 3. 3
regulator
USB interrupt
processing with4
byte FIFO
3.3V
EEPROM
interface
USB
TRX
USB
interface
4 byte
FIFO
USB control
processing
ISO out
processing
( with x2 mod)
12. 288/11. 2896 MHz
with adjustment
48 MHz
PLL1
PLL2
ISO in
processing
interface logics
ROM
300 x 16 SRAM
High-Pass Filter
PLL3 _12.288/
11. 2896MHz
IIS I/F
VREF
(2.25V)
bandgap
TEST
reset power on
reset
16 bit
DAC
sync by
VPR_ CLK
0 ~-45dB
38 steps
voltage linear
+
Vref
+
Vref
+
Vref
16 bit
DAC
16 bit Sigma-
Delta ADC
Vref ⁺
0 ~-45dB
38 steps
sync by voltage linear
VPL_ CLK
+ _Vref
+
Vref
+22.5~- 0 dB
16 steps
+ Vref
BOOST
+22.5 dB boost enable
4.5 V( drive typ4mA)
+22. 5 ~ 0 dB
16 steps
LOR
LOBS
LOL
MICIN
VREF
VBIAS
CM108AH Block Diagram
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Rev. 2.1︱ Page 9/27