CM108B
USB Audio Single Chip
A Highly Integrated USB Audio Single Chip
DESCRIPTION
FEATURES
The CM108B is a highly integrated crystal-free USB
audio single chip solution optimized for USB
headset, headphone, and dongle applications. The
CM108B comes with software driver interface
which supports XearTM sound effects for
multimedia entertainments. All essential analog
modules are embedded in the CM108B, including
dual DAC and earphone driver, ADC, microphone
booster, PLL, regulator and USB transceiver
modules. Many features are programmable with
jumper pins or by external EEPROM. Audio
adjustments are easily controlled via specific
HID-compliant volume control pins. An external
codec or audio DSP can be connected to the
CM108B via I2S pin for further processing. Vendors
can customize unique USB VID/PID/Product
String/Manufacture String and min/max/initial
volumes to EEPROM. The CM108B also comes with
an anti-pop noise circuits design and internal
oscillator which can operate without an external
crystal oscillator.
Compliant with USB 2.0 Full Speed Operation
Compliant with
Specification v1.0
USB
Audio
Device
Class
Supports USB Suspend/Resume Mode and Remote
Wakeup with Volume Control pins
On-chip oscillator that provides reference sources
for PLL and embedded USB transceiver
Jumper pin for Headset Mode (Playback +
Recording) and Speaker/Headphone Mode
(Playback Only)
Jumper pin for Mixer Unit enable/disable under
Headset Mode and Power Mode setting
I2S interfaces for external CODEC
Anti-pop noise design for plugged and vice-versa
Support XearTM Audio Centre Software Driver for
Windows OS
BLOCK DIAGRAM
VOLUP
VOLDN
MUTER
MUTEP
PWRSEL
MODE
PDSW
AREG36 DREG33 DREG18
MSEL
3.6V
3.3V
DASCLK/ADSCLK
DALRCK/ADLRCK
DAMCLK/ADMCLK
LEDO
LEDR GPIOs SDOUT/SDIN
I2S Out/In
1.8V
Regulator
5->3.6, 3.3 & 1.8
Interface Logics
LOBS
USB Control
VREF
16 bit
DAC
LOR
0 ~ -45dB
DW
DR
SK
CS
SPI
USBDP
USBDN
USB
USB
Interface
EEPROM
Interface
ISO Out
Processing
16 bit
DAC
LOL
0 ~ -45dB
SRAM
USB TRX
PLL
RF
12M
Datasheet Revision: 1.11
Page 1 / 24
8 ~ -22dB
ISO In
Processing
MICI
N
16 bit
ADC
VREF
23 ~ -22dB
12dB/22dB
Booster
VREF
(1.75V)
48M
bandgap
VBIAS
(3V)
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Copyright© C-Media Electronics Inc.
CM108B
USB Audio Single Chip
TABLE OF CONTENTS
1
2
3
4
Description and overview ......................................................................... 4
Ordering information .............................................................................. 4
Features ............................................................................................. 4
Pin descriptions ..................................................................................... 6
4.1
Pin assignment by pin number ............................................................... 6
4.2
Pin-out diagram ................................................................................ 6
4.3
Pin signal descriptions ........................................................................ 7
5 Block diagram ....................................................................................... 9
6
7
I2S Interface ...................................................................................... 10
Function description ............................................................................. 11
7.1
USB interface ................................................................................. 11
7.1.1
USB audio topology diagram for headset ..................................... 11
7.1.2
USB audio topology diagram for speaker ..................................... 12
7.1.3
Content format for EEPROM (93C46) .......................................... 13
7.1.4
EEPROM SPI interface timing information .................................... 14
7.2
Jumper pins and mode setting: ............................................................ 15
7.2.1
Mode pin and msel pin .......................................................... 15
7.2.2
Mode pin and pwrsel pin ........................................................ 15
7.3
HID feature .................................................................................... 16
7.3.1
HID descriptors ................................................................... 16
7.4
Internal Registers ............................................................................. 17
8 Electrical characteristics ........................................................................ 20
8.1
Absolute maximum rating ................................................................... 20
8.2
Operation conditions ......................................................................... 20
8.3
Electrical parameters ........................................................................ 20
9 Package information ............................................................................. 22
Reference ............................................................................................... 23
Datasheet Revision: 1.11
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CM108B
USB Audio Single Chip
Release notes
Revision
1.00
1.11
Datasheet Revision: 1.11
Page 3 / 24
Date
31 Oct 2013
18 Nov 2014
Description
First release
Correction on page 6 diagram
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CM108B
USB Audio Single Chip
1
Description and overview
The CM108B is a highly integrated single-chip USB audio solution. All essential analog modules are embedded in the
CM108B, including dual DAC and earphone driver, ADC, microphone booster, PLL, regulator and USB transceiver
modules. It is perfectly suited to USB headset, USB earphone or USB audio-interface box applications. As well, many
features are programmable with jumper pins or by external EEPROM.
The CM108B can connect to an external codec or audio DSP via I2S pins for further processing. Plus, 3 GPIO pins can
be accessed with customer application software for additional value-adding applications. In addition, audio
adjustments can be easily controlled via specific HID compliant volume control pins. Many features are
programmable with jumper pins or external EEPROM. Vendors can customize unique USB VID/PID/Product
String/Manufacture String and max/min/initial volumes to EEPROM. The CM108B also comes with an anti-pop noise
circuits design and internal oscillator which can operate without an external crystal oscillator.
2
3
Ordering information
Model No.
Package
Operating Ambient
Temperature
Supply Range
CM108B
48-pin LQFP, 7mm × 7mm × 1.4mm
(plastic)
-20°C to +70°C
DVdd = 5V, AVdd = 5V
Features
Supports USB 2.0 full speed operation
Compliant with USB audio device class specification 1.0
Supports USB suspend/resume modes and remote wakeup with volume control pins
On-chip oscillator that provides reference sources for PLL and embedded USB transceiver
Support XearTM audio driver for multimedia sound effects in Windows OS, for further information please refer to
CM108B XearTM Audio Center Driver User’s Manual
Jumper pin for speaker mode (playback only) or headset mode (playback plus 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 allows for mixer unit enable/disable when in headset mode
For speaker mode, the USB audio topology has 1 input terminal, 1 output terminal and 1 feature unit
Supports one control endpoint, one isochroous OUT endpoint, one isochroous IN endpoint, and one interrupt IN
endpoint
Alternate zero bandwidth setting for releasing playback bandwidth on USB Bus when device is inactive
Anti-pop noise design for device plugged and vice-versa, while A-A path is off
Supports AES/EBU, IEC60958, S/PDIF consumer formats for stereo PCM data at S/PDIF output
Volume up, volume down, and playback mute pins support USB HID for host control synchronization
Record mute pin with LED indicator for record mute status
Includes external EEPROM Interface for Vendor Specific USB VID, PID, Product String, Manufacture String, and
max/min/initial volumes
3 GPIO pins with read/write via HID interface
Jumper pin to set the power mode (100mA or 500mA, Bus-powered or self-powered)
Isochronous transfer uses adaptive mode with internal PLL for synchronization
48K/44.1KHz sampling rate for both playback and recording
Soft mute function
Datasheet Revision: 1.11
Page 4 / 24
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CM108B
USB Audio Single Chip
Embedded 16-bit ADC input with microphone boost
Embedded power-on reset block
Embedded 5V to 3.6V/3.3V/1.8V regulators for single external 5V power
48-pin LQFP package
Datasheet Revision: 1.11
Page 5 / 24
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Copyright© C-Media Electronics Inc.
CM108B
USB Audio Single Chip
4
Pin descriptions
4.1 Pin assignment by pin number
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
Signal Name
SPDIFO
DR
DW
SK
CS
MUTER
PWRSEL
DREG18
DREG33
MODE
N.C.
LEDO
Pin #
13
14
15
16
17
18
19
20
21
22
23
24
Signal Name
GPIO3
DVSS
GPIO4
SDIN
ADSCLS
MUTEP
ADLRCK
ADMCLK
LEDR
ADSEL
TEST
AVSS
Pin #
25
26
27
28
29
30
31
32
33
34
35
36
Signal Name
VBIAS
VREF
MICIN
N.C.
AVDD
LOL
LOBS
LOR
AVSS
AVDD
DVDD
DVSS
Pin #
37
38
39
40
41
42
43
44
45
46
47
48
AREG36
37
24
MSEL
38
23
TEST
VOLUP
39
22
ADSEL
PDSW
40
21
LEDR
USBDP
41
20
ADMCLK
USBDM
42
19
ADLRCK
GPIO1
43
18
MUTEP
SDOUT
44
17
ADSCLK
DAMCLK
45
16
SDIN
DALRCK
46
15
GPIO4
DASCLK
47
14
DVSS
VOLDN
48
13
GPIO3
Signal Name
AREG36
MSEL
VOLUP
PDSW
USBDP
USBDM
GPIO1
SDOUT
DAMCLK
DALRCK
DASCLK
VOLDN
VREF
VBIAS
26
25
AVDD
29
N.C.
LOL
30
MICIN
LOBS
31
27
LOR
32
28
AVDD
AVSS
33
35
34
DVSS
DVDD
36
4.2 Pin-out diagram
CM108B
10
MODE
12
9
DREG33
11
8
DREG18
N.C.
7
PWRSEL
LEDO
6
4
SK
5
3
DW
CS
2
DR
MUTER
1
SPDIFO
LQFP-48
AVSS
Pin Assignments (top view)
Datasheet Revision: 1.11
Page 6 / 24
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CM108B
USB Audio Single Chip
4.3 Pin signal descriptions
Pin #
1
2
3
4
5
6
Symbol
SPDIFO
DR
DW
SK
CS
MUTER
Type
DO, 4mA, SR
DI, 8mA, PD, 5VT
DO, 4mA, SR
DO, 4mA, SR
DO, 4mA, SR
DI, ST, PU
7
PWRSEL
DI, ST, PU
8
9
DREG18
DREG33
P
P
10
MODE
DI, ST, PD
11
12
13
14
15
16
17
18
19
N.C.
LEDO
GPIO3
DVSS
GPIO4
SDIN
ADSCLK
MUTEP
ADLRCK
DO, SR, 4mA
DIO, 8mA, PD, 5VT
P
DIO, 8mA, PD, 5VT
DIO, 8mA, PD, 5VT
DO, 2mA, SR
DI, ST, PU
DO, 2mA, SR
20
ADMCLK
DO, 2mA, SR
21
LEDR
DO, SR, 4mA
22
ADSEL
DI, ST, PD
23
TEST
DI, ST, PD
24
25
AVSS
VBIAS
P
AO
26
VREF
AO
27
28
29
30
31
32
33
34
35
36
37
MICIN
N.C.
AVDD
LOL
LOBS
LOR
AVSS
AVDD
DVDD
DVSS
AREG36
AI
LED operation light: output H for power on, toggling for data transmit
GPIO pin
Digital ground
GPIO pin
ADC I2S data input
ADC I2S serial clock
Mute playback (edge trigger with de-bouncing)
ADC I2S left/right clock
11.2896MHz output for 44.1KHz sampled data and
12.288MHz output for 48KHz sampled data
LED for mute recording indicator, output H when recording is muted
ADC input source select pin
H: use external (via I2S) ADC
L: use internal ADC
(H: push up to 3.3V, L: push down to ground)
Test mode select pin,
H: test mode
L: normal operation
(H: push up to 3.3V, L: push down to ground)
Analog ground
Microphone bias voltage supply (3V), with a small driving capability
Connecting to external decoupling capacitor for embedded bandgap
circuit, 1.75V output
Microphone input, input impedance is 10k Ohm
P
AO
AO
AO
P
P
P
P
P
5V analog power for analog circuit
Line out: left channel
DC 1.75V output for line out bias
Line out: right channel
Analog ground
5V power supply for analog circuit
5V power supply for internal regulator
Digital ground
3.6V analog power for analog circuit
Datasheet Revision: 1.11
Page 7 / 24
Description
SPDIF output
EEPROM interface data read from EEPROM
EEPROM interface data write to EEPROM
EEPROM interface clock
EEPROM interface chip select
Mute recording (edge trigger with de-bouncing)
Chip power select pin:
H: push up to 3.3V, L: push down to ground
Speaker mode – H: 100mA self-powered, L: 500mA Bus-powered
Headset mode – H: 100mA Bus-powered, L: 500mA Bus-powered
1.8V Regulator Output for Digital Core
3.3V Regulator Output for Digital I/O (driving current 40mA)
Operating mode selection:
H: push up to 3.3V, L: pull down to ground
H: speaker mode - playback only
L: headset mode - playback & recording
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CM108B
USB Audio Single Chip
38
MSEL
39
VOLUP
40
PDSW
41
42
43
44
USBDP
USBDM
GPIO1
SDOUT
45
DAMCLK
46
47
48
DALRCK
DASCLK
VOLDN
Mixer enable select:
H: push up to 3.3V, L: push down to ground
DI, ST, PU
H: with mixer/AA-path enabled (with default mute)
L: without mixer/AA-path disabled
USB descriptors will also be changed accordingly
DI, ST, PU
Volume up (edge trigger with de-bouncing)
Power down switch control signal (for PMOS polarity)
DO, 4mA , OD
0: normal operation
1: power down mode (suspend mode)
AIO
USB Data D+
AIO
USB Data DDIO, 8mA, PD, 5VT GPIO pin
DO, 2mA, SR
DAC I2S data output
11.2896 MHz output for 44.1KHz sampled data and
DO, 2mA, SR
12.288 MHz output for 48KHz sampled data
DO, 2mA, SR
DAC I2S left/right clock
DO, 2mA, SR
DAC I2S serial clock
DI, ST, PU
Volume down (edge trigger with de-bouncing)
NoteU: DI / DO / DIO – Digital Input / Output / Bi-Directional Pad
AI / AO / AIO – Analog Input / Output / Bi-Directional Pad
SR – Slew Rate Control
ST – Schmitt Trigger
PD / PU – Pull Down / Pull Up
5VT – 5 Volt Tolerant (3.3V Pad)
OD – Open Drain
P – Power Supply Pin
Datasheet Revision: 1.11
Page 8 / 24
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CM108B
USB Audio Single Chip
5
Block diagram
VOLUP
VOLDN
MUTER
MUTEP
PWRSEL
MODE
AREG36 DREG33 DREG18 PDSW MSEL
3.6V
3.3V
DASCLK/ADSCLK
DALRCK/ADLRCK
DAMCLK/ADMCLK
LEDO
LEDR GPIOs SDOUT/SDIN
I2S Out/In
1.8V
Regulator
5->3.6, 3.3 & 1.8
Interface Logics
LOBS
USB Control
VREF
16 bit
DAC
LOR
0 ~ -45dB
DW
DR
SK
CS
SPI
USBDP
USBDN
USB
USB
Interface
EEPROM
Interface
ISO Out
Processing
16 bit
DAC
LOL
0 ~ -45dB
SRAM
USB TRX
8 ~ -22dB
ISO In
Processing
PLL
RF
12M
MICI
N
16 bit
ADC
VREF
23 ~ -22dB
12dB/22dB
Booster
VREF
(1.75V)
48M
bandgap
VBIAS
(3V)
CM108B Block Diagram
Datasheet Revision: 1.11
Page 9 / 24
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CM108B
USB Audio Single Chip
6
I2S Interface
The CM108B provides an I2S interface for both playback and recording. External ADC, DAC, or DSP can be added to
provide additional functions within the USB audio system. The CM108B sends out master clock (fixed at x256), LRCK
(fixed at x64), and data clock data. Therefore, external ADCs, DACs, or DSPs should be set to slave mode.
The left channel of the CM108B’s I2S bus is used for mono recording. Both IP2PS buses use a 5V tolerant pad in order
to easily interface with 5V or 3.3V devices. Playback data is simultaneously sent to both the DAC and I2S bus. The
recording source (ADC or I2S bus) can be selected by ADSEL jumper pin.
Right Channel
Left Channel
LRCK
SCLK
SDATA
Datasheet Revision: 1.11
Page 10 / 24
MSB
-1
-2
+2
+1
LSB
MSB
-1
-2
+2
+1
LSB
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CM108B
USB Audio Single Chip
7
Function description
7.1 USB interface
The CM108B integrates USB transceiver, PLL and regulator modules, meaning only a few passive components are
necessary for USB interface connection. Default USB descriptors are embedded in the CM108B, so no additional
design effort is needed for generic USB operation. For custom orders, customers can attach a 93C46 EEPROM to
override the embedded VID, PID, product and manufacturer strings, and initial/max/min volume settings. The
CM108B automatically detects the 93C46, and the overwrite function is performed at start up.
7.1.1
USB audio topology diagram for headset
The CM108B supports headset and speaker topology that can be selected by MODE pin. The topology setting as
following: MODE=0, Headset Topology; MODE=1, Speaker Topology
0X0F
MIXER
0X01
IT
0X09
FEA
0X06
OT
0X08
SEL
0X07
OT
0X0D
FEA
0X02
IT
0X0A
FEA
Device Descriptor
Offset
0
1
2
4
5
6
7
8
10
Field
bLength
bDescriptorType
bcdUSB
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
idProduct
Size
1
1
2
1
1
1
1
2
2
Value (Hex)
12
01
0110
00
00
00
8
0d8c
0012
12
bcdDevice
2
0100
1
01
Index of string descriptor describing manufacturer
1
02
Index of string descriptor describing product
1
00
1
01
14
15
16
17
iManufacturer
iProduct
iSerialNumber
bNumConfigurations
Description
Total 18 Bytes
Device Descriptor
USB 1.1 compliant.
Device class specified by interface
Device subclass specified by interface
Device protocol specified by interface
Endpoint zero Size = 8 bytes
Vendor ID
Product ID
Device compliant to the Audio Device Class specification
version 1.00
Index of string descriptor describing the device’s serial
number
Configurations number = 1
Configuration Descriptor
Datasheet Revision: 1.11
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CM108B
USB Audio Single Chip
Offset
0
1
2
Field
bLength
bDescriptorType
wTotalLength
bNumInterfaces
4
5
6
7
8
bConfigurationValue
iConfiguration
bmAttributes
bMaxPower
7.1.2
Size
1
1
2
Value (Hex)
09
02
XXXX
1
04
1
1
1
2
01
00
80
32
Description
Total 9 Bytes
Configuration Descriptor
Total length of data returned for this configuration:
Programmable by MSEL and MODE pin
Number of interfaces supported by this Configuration:
0: control interface
1: ISO-OUT interface
2: ISO-IN interface
3: INT-IN(HID) interface
Configuration value
Index of string descriptor describing this configuration
Bus Power and support Remote Wakeup
Maximum power consumption of the USB Device: 100mA
USB audio topology diagram for speaker
0X01
IT
0X09
FEA
0X06
OT
Device Descriptor
Offset
0
1
2
4
5
6
7
8
10
12
14
15
16
17
Field
bLength
bDescriptorType
bcdUSB
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
idProduct
bcdDevice
iManufacturer
iProduct
iSerialNumber
bNumConfigurations
Size
1
1
2
1
1
1
1
2
2
2
1
1
1
1
Value (Hex)
12
01
0110
00
00
00
08
0d8c
0012
0100
01
02
00
01
Description
Descriptor length
Device Descriptor
USB 1.1 compliant
Device class specified by interface
Device subclass specified by interface
Device protocol specified by interface
Endpoint zero packet size
Vendor ID
Product ID
Device release number
Index of string descriptor describing manufacturer
Index of string descriptor describing product
Index of string descriptor describing serial number
Number of configuration
Value (Hex)
09
02
XXXX
Description
Descriptor length
Configuration Descriptor
Total length of data returned for this configuration:
Programmable by MSEL and MODE pin
Number of interfaces supported by this Configuration:
00: Control
01: ISO-Out
02: INT-IN (HID)
Configuration value
Index of string descriptor describing this configuration
Attributes(PWRSEL=0:Bus Powered, 1:SELF Powered)
Maximum power consumption from bus = 100mA
Configuration Descriptor
Offset
0
1
Field
bLength
bDescriptorType
Size
1
1
2
wTotalLength
2
4
bNumInterfaces
1
03
5
6
7
8
bConfigurationValue
iConfiguration
bmAttributes
bMaxPower
1
1
1
1
01
00
80
32
Datasheet Revision: 1.11
Page 12 / 24
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CM108B
USB Audio Single Chip
7.1.3
Content format for EEPROM (93C46)
Each address has 2-byte data, prefix `0x` means hex number
Address(Hex)
0x00
0x01
0x02
0x03
Description
bit[15:4] Magic Word
0x670X where X = bit 4, 3, 2, 1
bit[3] The value within address 0x2A, 0x2B, 0x32 is valid 1: valid 0: invalid
bit[2] reserved, should be 1
bit[1] serial number enable control 1: enable, 0: disable(default)
bit[0] reserved, should be 1
VID 2-byte
PID 2-byte
Serial number 1st
byte
Serial number length
(bit15-bit8, first
(bit7-bit0)
character)
0x04
~
0x09
Serial number 12-byte
0x0A
Product string 1st
byte (bit15-bit8, first
character)
0x0B
~
0x19
Product string 30-byte (default: USB Audio Device)
0x1A
Manufacturer string
1st byte
(bit15-bit8, first
character)
0x1B
~
0x29
Manufacturer string 30-byte (default: C-Media Electronics Inc.)
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
0x32
Product string length
(bit7-bit0) [0x3E->30,0x40->31Char]
Manufacturer string length
(bit7-bit0) [0x3E->30,0x40->31Char]
bit[15: 9] DAC initial volume (7-bit, default = -10dB)
bit[8: 3] ADC initial volume (6-bit, default = 8dB)
bit[2] DAC EEPROM MAX/MIN volume valid
bit[1] ADC EEPROM MAX/MIN volume valid
bit[0] AA EEPROM MAX/MIN volume valid
bit[15:11] AA initial volume (5-bit, default = -7dB)
bit[10] Reserved, should be 0
bit[9] Boost mode 0: 22dB 1:12dB (default)
bit[8] Shout down DAC analog circuits 1: shoutdown, 0: active(default)
bit[7] Total Power Control 1:enable, 0:disable(default)
bit[6] Reserved, should be 0
bit[5] MIC High Pass Filter
1:enable(default), 0:disable
bit[4] MIC PLL Adjust
1:enable, 0:disable(default)
bit[3] MIC BOOST
1:enable (default), 0:disable
bit[2] DAC Output Terminal property set to SPK or HP
1: Headset, 0: Speaker(default) bit[1] HID,
1: enable (default), 0: disable
bit[0] Remote wakeup, 1:enable, 0:disable(default)
bit[15:0] DAC Minimum Volume (0xD300, DAC-Min.=-37dB, default=-37dB)
bit[15:0] DAC Maximum Volume (0x0000, DAC-Max.=0dB, default=0dB)
bit[15:0] ADC Minimum Volume(0xEA00, ADC-Min.=-22dB, default=-12dB)
bit[15:0] ADC Maximum Volume(0x1700, ADC-Max.=+23dB, default=+23dB)
bit[15:0] AA Minimum Volume (0xE900, AA-Min.=-23dB, default=-23dB)
bit[15:0] AA Maximum Volume (0x0800,AA-Max.+8dB, default=+8dB)
EE_OPTION2 Register
bit[3] Reserved, should be 0
bit[2] Reserved, should be 0
Datasheet Revision: 1.11
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CM108B
USB Audio Single Chip
bit[1] Reserved, should be 0
bit[0] Reserved, should be 0
~ END
7.1.4
EEPROM SPI interface timing information
CS
tCSS
tSKH
tSKL
tCSH
SK
tDIS
tDIH
DI
tPD0
DO(READ)
tDF
tPD1
tDF
tSV
DO(PROG)
STATUS VALID
Symbol
Parameter
Test Condition*
Min
Typ
Max
Units
fSK
SK Clock Frequency
2.7V
工商网监
湘ICP备2023018690号
