CM109 查看數據表（PDF） - C-Media Electronics

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CM109

High Integration / Low Cost USB Audio Controller for PC Internet Phone

C-Media Electronics 

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Note: DI – Digital Input Pad, DO – Digital Output Pad, DIO – Digital bi-Directional Pad, AI/AO/AIO – Analog

Pad, SR Slew Rate Control, ST – Schmitt Trigger, PD/PU – Pull Down or Pull Up, 5VT – 5 Volt Tolerant

(3.3V Pad), OD – Open Drain

4. MCU INTERFACE

CM109 provides a serial MCU Interface for external MCU to access internal registers with

these registers access. MCU and host side software can have bi-directional

communication. This interface can keep flexibility for external module control and

integrate, such as LCD panel.

5. BLOCK DIAGRAM

REGV

PWRSEL

MODE

PDSW MSEL

5 -> 3.3

regulator

3.3V

CS

SK

DW

DR

USBDP

USBDM

EEPROM

interface

USB

interface

USB

TRX

12 MHz

48 MHz

PLL1

clock

gen

VOLUP

VOLDN

MUTER LEDO MCU

MUTEP LEDR I/F GPIO BUZZ 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

+12 ~ -33 dB

32 steps

16 bit ADC

+22.5 ~ 0 dB

16 steps

MICIN

+20dB boost enable

VREF

(2.25V)

bandgap

4.5V

VREF

VBIAS

Block Diagram Of CM109

Date: 08/Sep/2005

-9-

Version: 1.3a

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