CM108AH Datasheet, PDF(2/27 Page) C-Media Electronics – Highly Integrated USB Audio I/O Controller

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CM108AH Datasheet, PDF (2/27 Pages) C-Media Electronics – Highly Integrated USB Audio I/O Controller

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CM108AH

Highly 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 IÂ²S 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 Whatâs 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 Frequency 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

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