Analog Devices EVAL-ADAU1977 User Manual page 11

Evaluation Board User Guide
INPUT BUFFER FOR LEVEL SHIFTING INPUT
+IN_BUFFER
J9
SLEEVE
1
2
TIP
JP1
RING
-IN_BUFFER
ANALOG INPUTS
1 AIN_CH1+
2 AIN_CH1–
JP2
SLEEVE
J17 TIP
RING
INPUT CH1
1 AIN_CH2+
2 AIN_CH2–
JP3
SLEEVE
J28 TIP
RING
INPUT CH2
1 AIN_CH3+
2 AIN_CH3–
JP5
SLEEVE
TIP
J38
RING
INPUT CH3
1 AIN_CH4+
2 AIN_CH4–
JP7
SLEEVE
TIP
J47
RING
INPUT CH4
C91
OPEN
R17
R16
10.0kΩ
R12
C19
10.0Ω
U1-A
[2] CM_IN+
10µF
10.0Ω
[2] CM_IN–
10µF
R6 C10
10.0kΩ
R7
R122
10µF C41
0Ω
C40
OPEN
C43
2 3
1.0nF
1 4
S10
AC COUPLING CAP BYPASS
+OUT_BUFFER [2]
R123
10µF C38
0Ω
C36
OPEN
C37
1.0nF
[2] –OUT_BUFFER
10µF C74
R124 0Ω
C77
OPEN C78
1.0nF
2 3
1 4
S16
+OUT_BUFFER [2]
AC COUPLING CAP BYPASS
10µF C57
R125 0Ω
C56
OPEN
C60
1.0nF
–OUT_BUFFER [2]
R126
10µF C90
0Ω
C88
OPEN C89
2 3
1.0nF
1 4
+OUT_BUFFER [2] S21
AC COUPLING CAP BYPASS
R127
10µF C86
0Ω
C84
C85
OPEN
1.0nF
–OUT_BUFFER [2]
R128
10µF C100
0Ω
C102
OPEN
C103
1.0nF
2 3
1 4
S26
+OUT_BUFFER [2]
AC COUPLING CAP BYPASS
R129
10µF C93
0Ω
C92
1.0nF
NOTES ON JUMPER SELECTION
J2: USE FOR SELECTING THE CM LEVEL FOR THE EXTERNAL INPUT
J1, J22, J31, J41, J51: USE FOR SELECTING INTERNAL OR EXTERNAL MICBIAS FOR INPUTS
S12, S18, S23, S29: USE FOR SELECTING THE MICBIAS RESISTOR +INPUTS
S5, S15, S20, S25: USE FOR SELECTING THE MICBIAS RESISTOR -INPUTS
–OUT_BUFFER [2] J20, J15, J30, J27, J40, J36, J49, J46: USE FOR SELECTING THE DIRECT OR BUFFERED INPUT
J19, J29, J39, J48: USE FOR SHORTING THE +/- INPUT PINS FOR DIAGNOSTICS TEST
S11, S6, S17, S14, S22, S19, S28, S24: USE FOR GENERATING FAULT ON INPUT PINS FOR DIAGNOSTICS TESTING
Figure 7. EVAL-ADAU1977Z
CM INPUT SELECT
HVDD
C16 22pF
10.0kΩ C12
0.10µF
HVDD
V+
2
8
–
1
VBAT
O [1,2,4]
3
+
4 +OUT_BUFFER [2]
V–
HVSS
MICBIAS_EXT
TP4
HVSS 1
U1-B
5
+
7
MICBIAS
O
6
–
–OUT_BUFFER [2]
C13
0.10µF
10.0kΩ
R9
C6 22pF
MICBIAS_CH1
FAULT GEN SELECT P
S11
1
OPEN
2
MICBIAS_CH1 [2]
C1
3
FAULT_IN+
C2
4
VBAT [2,6]
5
[1,2,4]
S6
1
OPEN
2
C1
3
FAULT_IN–
C2
4
[2,6]
5
FAULT GEN SELECT N
MICBIAS_CH2
FAULT GEN SELECT P
S17
1
OPEN
2 MICBIAS_CH1 [2]
C1
3 FAULT_IN+
C2
4 VBAT [2,6]
5 [1,2,4]
S14
1
OPEN
2
C1
3 FAULT_IN–
C2
4 [2,6]
5
FAULT GEN SELECT N
MICBIAS_CH3
FAULT GEN SELECT P
S22
1
OPEN
2
MICBIAS_CH1 [2]
C1
3
FAULT_IN+
C2
4
VBAT [2,6]
5
[1,2,4]
S19
1
OPEN
2
C1
3
FAULT_IN–
C2
4
[2,6]
5
FAULT GEN SELECT N
MICBIAS_CH4
FAULT GEN SELECT P
S28
1
OPEN
2
C1
3
C2
4
5
S24
1
OPEN
2
C1
3
C2
4
5
FAULT GEN SELECT N
Schematic, Page 2 of 6
Rev. 0 | Page 11 of 27
ADJUST FOR DESIRED CM LEVEL
R1 R5
10.0kΩ
HEADER_12WAY_UNSHROUD
1/2VBAT 1
MICBIAS_1977
2/3MICBIAS 3
5
J1
3 7
A B
9
1/3MICBIAS
2
11
R4 R3 R2
10.0kΩ 10.0kΩ 10.0kΩ
MICBIAS_EXT MICBIAS_1977
TP30
J22
TP33
3
1
A B
2
AIN1P
[1,6]
MIC BIAS SELECT P
499Ω
R108
4 1
3 2
R107
301Ω
S12
S7
499Ω
R106
1 4
2 3
R105
301Ω
MIC BIAS SELECT N
AIN1N
[1,6]
MICBIAS_EXT MICBIAS_1977
TP49
J31
3
1
A B
2
AIN2P
[1,6]
MIC BIAS SELECT P
499Ω
R113
4 1
3 2
R112
301Ω
S18
S15
499Ω
R110
1 4
2 3
R109
301Ω
MIC BIAS SELECT N
AIN2N
[1,6]
MICBIAS_EXT MICBIAS_1977
TP56
J41
3
1
A B
2
AIN3P
[1,6]
R117
MIC BIAS SELECT P
499Ω
[2]
4 1
3 2
R116
301Ω
S23
S20
499Ω
1
R115
4
2 3
R114
301Ω
MIC BIAS SELECT N
AIN3N
[1,6]
MICBIAS_EXT MICBIAS_1977
TP76
J51
3
1
A B
2
AIN4P
R121 [1,6]
MIC BIAS SELECT P
499Ω
[2]
4 1
3 2
R120
301Ω
S29
S25
499Ω
R119
1 4
2 3
R118
301Ω
MIC BIAS SELECT N
AIN4N
[1,6]
UG-600
J2
2
CM_IN+ [2]
4
6
8
CM_IN– [2]
10
12