參數資料
型號: AK5371AVQ
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 2ch A/D Converter with USB I/F
中文描述: 2通道的A / D轉換器的USB我/女
文件頁數: 29/32頁
文件大?。?/td> 317K
代理商: AK5371AVQ
ASAHI KASEI
[AK5371A]
29
MS0103-E-00
MS0546-E-00
2007/02
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
Set Endpoint Control Request
Offset
Field
Size
Value
0
bmRequestType
1
0x22
1
bRequest
1
0x01
2
wValue
2
0x0100
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
4
wIndex
2
0x0081
6
wLength
2
0x0003
The parameter block of mute control is the following.
Offset
Field
0
iSampleFreq
Size
3
Value
0xYYYYYY
Description
The following five values are valid. Others are
invalid.
0x001F40 : 8kHz
0x002B11 : 11.025kHz
0x005622 : 22.05kHz
0x00AC44 : 44.1kHz(default)
0x00BB80 : 48kHz
If the iSampleFreq is different from the above values, the AK5371A forces sampling frequency to the
appropriate value.
5.2.2
Get Endpoint Control Request
Offset
Field
Size
Value
0
bmRequestType
1
0xA2
1
bRequest
1
0x81
2
wValue
2
0x0100
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
4
wIndex
2
0x0081
6
wLength
2
0x0003
The parameter block of mute control is the following.
Offset
Field
0
iSampleFreq
Size
3
Value
0xYYYYYY
Description
The following five values are valid. Others are
invalid.
0x001F40 : 8kHz
0x002B11 : 11.025kHz
0x005622 : 22.05kHz
0x00AC44 : 44.1kHz
0x00BB80 : 48kHz
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