AK5374 Datasheet, PDF (29/51 Pages) Asahi Kasei Microsystems – 24-bit Stereo ADC with USB Interface

4. Audio Streaming Interface Descriptor
4.1 Zero-bandwidth Alternate Setting
4.1.1 Standard Audio Streaming Interface Descriptor (Alt = 0)
Offset
0
1
2
3
4
5
6
7
8
Field
bLength
bDescriptorType
bInterfaceNumber
bAlternateSetting
bNumEndpoints
bInterfaceClass
bInterfaceSubclass
bInterfaceProtocol
iInterface
Size Value
1 0x09
1 0x04
1 0x01
1 0x00
1 0x00
1 0x01
1 0x02
1 0x00
1 0x00
Description
Size of this descriptor in bytes
INTERFACE descriptor
Index of this interface
Index of this setting
Endpoints 0
AUDIO
AUDIO_STREAMING
Not used. Must be set to 0.
Null string
4.2 Operational Alternate Setting 1
4.2.1 Standard Audio Streaming Interface Descriptor (Alt = 1: Mono, 8bit, 8k/16k)
Offset
0
1
2
3
4
5
6
7
8
Field
bLength
bDescriptorType
bInterfaceNumber
bAlternateSetting
bNumEndpoints
bInterfaceClass
bInterfaceSubclass
bInterfaceProtocol
iInterface
Size Value
1 0x09
1 0x04
1 0x01
1 0x01
1 0x01
1 0x01
1 0x02
1 0x00
1 0x00
Description
Size of this descriptor in bytes
INTERFACE descriptor
Index of this interface
Index of this setting
Endpoint 1
AUDIO
AUDIO_STREAMING
Not used. Must be set to 0.
Null string
4.2.2 Class-specific Audio General Interface Descriptor
Offset
0
1
2
3
4
5
Field
bLength
bDescriptorType
bDescriptorSubtype
bTerminalLink
bDelay
wFormatTag
Size Value
1 0x07
1 0x24
1 0x01
1 0x02
1 0x01
2 0x0002
Description
Size of this descriptor in bytes
CS_INTERFACE descriptor
AS_GENERAL
Unit ID of terminal (Output Terminal ID)
Interface delay
PCM8
[AK5374]
MS1197-E-00
- 29 -
2010/05