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CM108AH Datasheet Preview

CM108AH Datasheet

A High Integrated USB Audio I/O Controller

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CM108AH
A High Integrated USB Audio I/O Controller
DESCRIPTION
CM108AH is a highly integrated single chip USB
audio solution. All essential analog modules are
embedded in CM108AH, 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 CM108AH
via I2S pin for further processing.
FEATURES
Compliant with USB 2.0 Full Speed Operation
Compliant with USB Audio Device Class
Specification v1.0
Supports USB Suspend / Resume Mode and
Remote Wakeup with Volume Control Pins
Single 12MHz Crystal Input with On-chip PLL and
Embedded USB Transceiver
Jumper Pin for Speaker Mode (Playback Only) or
Headset Mode (Playback + Recording)
For Headset Mode, USB Audio Function Topology
has 2 Input Terminals, 2 Output Terminals, 1
Mixer Unit, 1 Selector Unit, and 3 Feature Units
Jumper Pin for Mixer Unit Enable / Disable under
Headset Mode
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
www.cmedia.com.tw
Copyright © C-Media Electronics Inc.
Rev. 1.9Page 1/27




C-Media

CM108AH Datasheet Preview

CM108AH Datasheet

A High Integrated USB Audio I/O Controller

No Preview Available !

CM108AH
A High Integrated USB Audio I/O Controller
TABLE OF CONTENTS
1 Description and Overview ..................................................................... 3
2 Features .......................................................................................... 3
3 Pin Descriptions ................................................................................. 5
3.1 Pin Assignment by Pin Number................................................................................. 5
3.2 Pin-Out Diagram.................................................................................................. 5
3.3 Pin Signal Descriptions .......................................................................................... 6
4 I²S Interface ..................................................................................... 8
5 Block Diagram ................................................................................... 9
6 Ordering Information.......................................................................... 10
7 Function Description .......................................................................... 11
7.1 USB Interface .................................................................................................... 11
7.1.1
Device Descriptor .............................................................................................. 11
7.1.2
Configuration Descriptor...................................................................................... 12
7.1.3
Content Format for EEPROM (93C46) ....................................................................... 13
7.1.4
USB Audio Topology Diagram................................................................................. 14
7.2 Jumper Pins and Mode Setting:............................................................................... 15
7.3 HID Feature ...................................................................................................... 16
7.3.1
What’s HID ...................................................................................................... 16
7.3.2
HID Descriptor.................................................................................................. 17
7.3.3
Windows Software Architecture for HID .................................................................... 18
7.4 Internal Registers ............................................................................................... 19
8 Electrical Characteristics..................................................................... 22
8.1 Absolute Maximum Rating ..................................................................................... 22
8.2 Operation Conditions........................................................................................... 22
8.3 Electrical Parameters .......................................................................................... 23
9 Audio Quality Graphs.......................................................................... 24
9.1 Line Out Freq Response @ 48KHz Sample Rate (10K Ohm Loading).................................... 24
9.2 Line Out THD+N @ 48KHz sample rate (10K Ohm Loading) .............................................. 24
9.3 Microphone Input Freq Response @ 48KHz Sample Rate ................................................. 25
9.4 Microphone Input THD+N @ 48KHz Sample Rate .......................................................... 25
Reference ............................................................................................ 26
www.cmedia.com.tw
Copyright © C-Media Electronics Inc.
Rev. 1.9Page 2/27


Part Number CM108AH
Description A High Integrated USB Audio I/O Controller
Maker C-Media
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