C371346_375F2440A66FD1C882296D07948AE54C.pdf - 第10页
CM 108AH Highly Integrated USB Audio I/O Controller www .cmedia.com.tw Copyright© C-Media Electro nics Inc. R ev . 2.1 ︱ P age 10/27 6 Ordering Informatio n Model N o. Package Operating Ambient Temperature Supply Range C…
CM108AH
Highly Integrated USB Audio I/O Controller
www.cmedia.com.tw
Copyright© C-Media Electronics Inc. Rev. 2.1︱ Page 9/27
5 Block Diagram
USB
TRX
USB
interface
4 byte
FIFO
USB control
processing
ISO out
processing
( with x2 mod)
PLL1
48 MHz
ROM
PLL2
12. 288 /11. 2896 MHz
with adjustment
12 MHz
VREF
(2.25V)
power on
reset
reset
16 bit
DAC
bandgap
3.3V
+
-
+
-
Vref
5 - > 3. 3
regulator
REGV
ISO in
processing
300 x 16 SRAM
16 bit Sigma-
Delta ADC
16 bit
DAC
+
-
Vref
+22.5~ - 0 dB
16 steps
Vref
PLL3
12. 288/
11. 2896 MHz
USB interrupt
processing with 4
byte FIFO
interface logics
MUTER
MCU
I/F
VOLDN
VOLUP
VREF
MUTEP
LOL
LOR
LEDO
LEDR
PDSW
+
-
+22. 5 ~ 0 dB
16 steps
Vref
0 ~ -45dB
38 steps
voltage linear
VBIAS
4.5 V ( drive typ 4mA)
EEPROM
interface
CS
SK
DW
DR
USBDP
USBDM
XI
XO
MICIN
+
-
Vref
Vref
+
-
+
-
Vref
LOBS
GPIO
BOOST
+22.5
dB boost enable
0 ~ -45dB
38 steps
voltage linear
PWRSEL
MODE
SEL pins
TEST
sync by
VPR_CLK
sync by
VPL_CLK
BUZZ
IIS I/F
SPDIFO
High-Pass Filter
CM108AH Block Diagram
CM108AH
Highly Integrated USB Audio I/O Controller
www.cmedia.com.tw
Copyright© C-Media Electronics Inc. Rev. 2.1︱ Page 10/27
6 Ordering Information
Model No.
Package
Operating Ambient
Temperature
Supply Range
CM108AH
48-pin LQFP, 7mm × 7mm × 1.4mm (plastic)
-15°C to +70°C
DVdd = 5V, AVdd = 5V
Note: Outline Dimensions are shown in inches and millimeters
48-Lead Thin Plastic Quad Flatpack (LQFP)
CM108AH Ordering Information
CM108AH
Highly Integrated USB Audio I/O Controller
www.cmedia.com.tw
Copyright© C-Media Electronics Inc. Rev. 2.1︱ Page 11/27
7 Function Description
7.1 USB Interface
The CM108AH 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 CM108AH, 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 serial number for
each set. The CM108AH automatically detects the 93C46, and the overwrite function is performed at start up.
7.1.1 Device Descriptors
Offset
Field
Size
Value (Hex)
Description
0
bLength
1
12
Total: 18 bytes
1
bDescriptorType
1
01
Device descriptor
2
bcdUSB
2
0110
USB 1.1-compliant
4
bDeviceClass
1
00
5
bDeviceSubClass
1
00
6
bDeviceProtocol
1
00
7
bMaxPacketSize0
1
40
Endpoint zero size = 64 bytes
8
idVendor
2
0d8c
Vendor ID
10
idProduct
2
0139
Product ID programmable by MSEL and MODE pin
12
bcdDevice
2
0100
Device compliant with Audio Device class
specification version 1.0
14
iManufacturer
1
01
String descriptor index describes manufacturer
15
iProduct
1
02
String descriptor index describes product
16
iSerialNumber
1
03
String descriptor index displays device serial no.
17
bNumConfigurations
1
01
Configuration number = 1