AK5371VQ Asahi Kasei Microsystems, AK5371VQ Datasheet - Page 29

• Manufacturer Part Number: AK5371VQ
• Description: 2CH A/D CONVERTER WITH USB I/F
• Manufacturer: Asahi Kasei Microsystems

MS0103-E-00
ASAHI KASEI
5.2 Endpoint Control Request
The AK5371 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 AK5371 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
0xYYYYYY
0xYYYYYY
Value
Value
Value
0x22
0x01
0x0100
0x0081
Value
0xA2
0x81
0x0100
0x0081
0x0003
0x0003
29
SET_CUR
Upper byte: SAMPLING_FREQ_CONTROL (0x01)
Upper Byte : zero
The following five values are valid.
Upper byte: SAMPLING_FREQ_CONTROL (0x01)
Upper Byte : zero
The following five values are valid.
Description
Lower byte : zero
Lower Byte : Endpoint Address (0x81)
The Length of Sampling Frequency Parameter
Block
Description
invalid.
0x001F40 : 8kHz
0x002B11 : 11.025kHz
0x005622 : 22.05kHz
0x00AC44 : 44.1kHz(default)
0x00BB80 : 48kHz
Description
GET_CUR
Lower byte : zero
Lower Byte : Endpoint Address (0x81)
The Length of Sampling Frequency Parameter
Block
Description
invalid.
0x001F40 : 8kHz
0x002B11 : 11.025kHz
0x005622 : 22.05kHz
0x00AC44 : 44.1kHz
0x00BB80 : 48kHz
[AK5371]
Others are
Others are
2001/06