Texas Instruments ADS1278-SP, User Manual, Page: 24 / 32

100k
R29
AVDD
1
2
JP3
AGND
BUF_PDN
1.0k R45
1.0k R46
1.0k
R47
49.9
R50
49.9 R49
1.0k
R48
2200pF
C25
1.0k
R22
1.0k R24
1.0k
R27
1.0k R26
49.9 R23
2200pF
C23
49.9 R28
BUF_PDN
AGND
AVDD
AVDD
AGND
AVDD
AGND
BUF_PDN
AVDD
AGND
1.0k
R39
49.9 R14
49.9 R15
1.0k
R38
1.0k R43
1.0k
R42
49.9 R37
49.9 R36
1.0k
R17
1.0k
R18
AGND AGND
REFN_HDR
REFP_HDR
AGND
AVDD
AGND
AGND
AVDD
AGND
BUF_PDN
ANP2
ANN2
ANP1
ANP3
ANN3
CHAN-N1
CHAN-P1
CHAN-P2
CHAN-N2
ANN4
ANP4
1.0k R21
1.0k
R20
ANP4
ANN4
ANN3
ANP3
2200pF
C18
CHAN-N3
CHAN-P3
2200pF
C16
CHAN-N4
CHAN-P4
ANN1
ANP1
ANP2
ANN2
1 2 3
4 5 6
S4
1 2 3
4 5 6
S5
1 2 3
4 5 6
S8
1 2 3
4 5 6
S7
AGND
AVDD
AGND
THS4521IDGKR
1
2
3
4
5
6
7
8
U5
AGND
AGND
AVDD
THS4521IDGKR
1
2
3
4
5
6
7
8
U11
THS4521IDGKR
1
2
3
4
5
6
7
8
U9
THS4521IDGKR
1
2
3
4
5
6
7
8
U3
C
M
C
H
A
N
-N[1
..
4
]
C
H
A
N
-P
[1..
4
]
C
H
AN
-N
[1
..
4]
C
H
AN
-P[
1
..
4
]
CM
CM
C
H
A
N-N
[1
..
4
]
C
H
A
N-P
[1..
4
]
C
H
AN
-N
[1
..
4]
C
H
AN
-P
[1
..
4
]
A
NP[
1
..
4
]
AN
P[
1.
.4
]
AN
N
[1
..
4]
A
NN
[1
..
4
]
A
NN
[1.
.4
]
A
N
N
[1
..
4
]
A
N
P
[1
..
4
]
AN
P[
1
..
4
]
A
NP[
1
..
4
]
AN
P[
1
..
4
]
A
NN
[1.
.4
]
A
NN
[1
..
4
]
PWRDN BUFFERS
ANP4
ANP3
ANP2 ANN4
ANN3
ANN2
ANN1
ANP1
ANN1
1
3
5
6
4
2
7
9
10
8
12 11
14 13
16 15
18 17
20 19
J3
TP9
TP10
0.1uF
C13
0.1uF
C17
0.1uF
C21
0.1uF
C22
0.1uF
C39
0.1uF
C49
0.1uF
C55
0.1uF
C50
1500pF
C14
1 2
1500pF
C15
1500pF
C19
1500pF
C24
1500pF
C52
1500pF
C53
1500pF
C48
1500pF
C47
Schematic and Bill of Materials
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24 SBAU324 – September 2018
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Figure 14. Schematic03