AK5373 Datasheet, PDF (34/53 Pages) Asahi Kasei Microsystems – 24-bit Stereo ADC with USB Interface

[AK5373]
4.4 Operational Alternate Setting 3
4.4.1 Standard Audio Streaming Interface Descriptor (Alt = 3: Mono, 24bit, 32k/44.1k/48k)
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 0x03
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
4.4.2 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 0x0001
Description
Size of this descriptor in bytes
CS_INTERFACE descriptor
AS_GENERAL
Unit ID of terminal (Output Terminal ID)
Interface delay
PCM
4.4.3 Type I Format Type Descriptor
Offset
0
1
2
3
4
5
6
7
8
11
14
Field
bLength
bDescriptorType
bDescriptorSubtype
bFormatType
bNrChannels
bSubFrameSize
bBitResolution
bSamFreqType
tSamFreq[0]
tSamFreq[1]
tSamFreq[2]
Size Value
Description
1 0x11
Size of this descriptor in bytes
1 0x24
CS_INTERFACE
1 0x02
FORMAT_TYPE
1 0x01
FORMAT_TYPE_I
1 0x01
One channel
1 0x03
Three bytes per slot
1 0x18
24 bits
1 0x03
Three frequencies
3 0x007D00 32000Hz
3 0x00AC44 44100Hz
3 0x00BB80 48000Hz
4.4.4 Standard Endpoint Descriptor
Offset
0
1
2
3
4
6
7
8
Field
bLength
bDescriptorType
bEndpointAddress
bmAttributes
wMaxPacketSize
bInterval
bRefresh
bSynchAddress
Size Value
1 0x09
1 0x05
1 0x81
1 0x0D
2 0x0090
1 0x01
1 0x00
1 0x00
Description
Size of this descriptor in bytes
ENDPOINT descriptor
Endpoint 1, IN direction
Isochronous, synchronous, not shared
3byte*48sample*1ch=144 byte/frame
One packet every frame (Must be set to 1)
MS1202-E-00
- 34 -
2010/06