AK5371AVQ AKM [Asahi Kasei Microsystems], AK5371AVQ Datasheet - Page 29

• Manufacturer Part Number: AK5371AVQ
• Description: 2ch A/D Converter with USB I/F
• Manufacturer: AKM [Asahi Kasei Microsystems]

MS0546-E-00
ASAHI KASEI
5.2 Endpoint Control Request
The AK5371A supports five sampling frequencies. The sampling rate is changed when “Set Endpoint
Control Request ” is issued. SET_CUR, GET_CUR of bRequest is only supported. GET_MIN, GET_
MAX, and GET_RES of bRequest are not supported.
5.2.1
Offset
0
1
2
4
6
The parameter block of mute control is the following.
Offset
0
If the iSampleFreq is different from the above values, the AK5371A forces sampling frequency to the
appropriate value.
5.2.2
Offset
0
1
2
4
6
The parameter block of mute control is the following.
Offset
0
MS0103-E-00
Set Endpoint Control Request
Get Endpoint Control Request
Field
bmRequestType
bRequest
wValue
wIndex
wLength
Field
iSampleFreq
Field
bmRequestType
bRequest
wValue
wIndex
wLength
Field
iSampleFreq
Size
Size
Size
Size
3
3
1
1
2
2
2
1
1
2
2
2
Value
0xYYYYYY
Value
0xYYYYYY
Value
0x22
0x01
0x0100
0x0081
0x0003
Value
0xA2
0x81
0x0100
0x0081
0x0003
29
Description
SET_CUR
Upper byte: SAMPLING_FREQ_CONTROL (0x01)
Lower byte : zero
Upper Byte : zero
Lower Byte : Endpoint Address (0x81)
The Length of Sampling Frequency Parameter
Block
Description
The following five values are valid.
invalid.
0x001F40 : 8kHz
0x002B11 : 11.025kHz
0x005622 : 22.05kHz
0x00AC44 : 44.1kHz(default)
0x00BB80 : 48kHz
Description
GET_CUR
Upper byte: SAMPLING_FREQ_CONTROL (0x01)
Lower byte : zero
Upper Byte : zero
Lower Byte : Endpoint Address (0x81)
The Length of Sampling Frequency Parameter
Block
Description
The following five values are valid.
invalid.
0x001F40 : 8kHz
0x002B11 : 11.025kHz
0x005622 : 22.05kHz
0x00AC44 : 44.1kHz
0x00BB80 : 48kHz
[AK5371A]
Others are
Others are
2007/02