w681308 Winbond Electronics Corp America, w681308 Datasheet - Page 45

• Manufacturer Part Number: w681308
• Description: Usb Audio Controller
• Manufacturer: Winbond Electronics Corp America

For higher gain configurations, the current gain mode can be used as in
Figure
Current Gain Mode
10
below.
Microphone
Microphone
Microphone
Microphone
Electret
Electret
Electret
Electret
Rm
Rm
0 Ohm
0 Ohm
Or ferrite
Or ferrite
Rm
Rm
0 Ohm
0 Ohm
Or ferrite
Or ferrite
Figure 10 Microphone Current Gain Mode
Figure 9 Microphone Voltage Gain Mode
RGND
RGND
MCP
MCP
MCO
MCO
MCP
MCP
MCO
MCO
I
I
S
S
MIC_RES[7:4]
MIC_RES[7:4]
MIC_RES[7:4]
MIC_RES[7:4]
I
I
0x1488
0x1488
0x1488
0x1488
S
S
XXXX PRODUCT DESCRIPTION
R
R
INT2
INT2
MIC_GAIN[7:4]
MIC_GAIN[7:4]
250 Ohm
250 Ohm
250 Ohm
250 Ohm
MIC_GAIN[7:4]
MIC_GAIN[7:4]
MIC_GAIN[7:4]
MIC_GAIN[7:4]
R
R
R
R
45
INT1
INT1
INT
INT
0x1489
0x1489
0x1489
0x1489
0x1489
0x1489
MIC_BIAS[2:0]
MIC_BIAS[2:0]
MIC_BIAS[2:0]
MIC_BIAS[2:0]
0x1488
0x1488
0x1488
0x1488
Rinternal
Rinternal
+
+
-
-
+
+
-
-
0x1489
0x1489
V
V
V
V
Voltage Gain Mode
Voltage Gain Mode
Current Gain Mode
Current Gain Mode
MCP
MCP
MIC_MODE=‘010’or ‘011’
MIC_MODE=‘010’or ‘011’
ADC
ADC
MIC_MODE=‘000’
MIC_MODE=‘000’
W681308
W681308
'000'
'000'
W681308
W681308
0x1489
0x1489
0x1489
0x1489
R
R
V
V
V
V
I
I
I
I
EXT
EXT
=
=
ADC
ADC
ADC
ADC
S
S
S
S
>
>
1
1
'
'
'
'
011
011
010
010
20
20
'
'
'
'
+
+
=
=
=
=
kΩ
kΩ
To ADC
To ADC
−
−
−
−
To ADC
To ADC
(R
(R
R
R
R
R
R
R
INT
INT
EXT
EXT
INT
INT
INT
INT
+
+
250)
250)
1
1
2
2
W681308
Rev1.2