AK5374 Datasheet, PDF (28/51 Pages) Asahi Kasei Microsystems – 24-bit Stereo ADC with USB Interface

[AK5374]
3.2 Class-specific Audio Control Interface Descriptor
Offset
0
1
2
3
Field
bLength
bDescriptorType
bDescriptorSubtype
bcdADC
5 wTotalLength
7 bInCollection
8 bInterfaceNr(1)
Size Value
Description
1 0x09 Size of this descriptor in bytes
1 0x24 CS_INTERFACE
1 0x01 HEADER subtype
2 0x0100 1.0 – Audio Device Class specification release number in
Binary-Coded Decimal.
2 0x0028 Total size of class-specific Audio Control Interface descriptors
(includes this descriptor)
1 0x01 Number of streaming interfaces
1 0x01 Streaming interface number 1 belongs to this audio control
interface.
3.3 Input Terminal Descriptor
Offset
0
1
2
3
4
6
7
8
10
11
Field
bLength
bDescriptorType
bDescriptorSubtype
bTerminalID
wTerminalType
bAssocTerminal
bNrChannels
wChannelConfig
iChannelNames
iTerminal
Size Value
1 0x0C
1 0x24
1 0x02
1 0x01
2 0x0201
1 0x02
1 0x02
2 0x0003
1 0x00
1 0x00
Description
Size of this descriptor in bytes
CS_INTERFACE
INPUT_TERMINAL subtype
ID of this terminal
Terminal is Microphone
ID of associated Output Terminal is 0x02
Two channels (Stereo)
Left/Right Front
Not used. Must be set to 0.
Not used. Must be set to 0.
3.4 Output Terminal Descriptor
Offset
0
1
2
3
4
6
7
8
Field
bLength
bDescriptorType
bDescriptorSubtype
bTerminalID
wTerminalType
bAssocTerminal
bSourceID
iTerminal
Size Value
1 0x09
1 0x24
1 0x03
1 0x02
2 0x0101
1 0x01
1 0x03
1 0x00
Description
Size of this descriptor in bytes
CS_INTERFACE
OUTPUT_TERMINAL subtype
ID of this terminal
USB Streamer
ID of associate Input Terminal is 0x01
From Feature Unit
Not used. Must be set to 0.
3.5 Feature Unit Descriptor
Offset
0
1
2
3
4
5
6
7
8
9
Field
bLength
bDescriptorType
bDescriptorSubtype
bUnitID
bSourceID
bControlSize
bmaControls(0)
bmaControls(1)
bmaControls(2)
iFeature
Size Value
1 0x0A
1 0x24
1 0x06
1 0x03
1 0x01
1 0x01
1 0x01
1 0x02
1 0x02
1 0x00
Description
Size of this descriptor in bytes
CS_INTERFACE
FEATURE_UNIT descriptor subtype
ID of this feature Unit
ID to Terminal to which this is connected.
Size in bytes of an element of the bmaControl()
D0(Mute) is enable for ch 0
D1(Volume) is enable for ch 1 (Left)
D1(Volume) is enable for ch 2 (Right)
Not used. Must be set to 0.
MS1197-E-00
- 28 -
2010/05