Texas Instruments ADS7881, User Manual, Page: 15 / 23

C21
0.01uF
C43
0.1uF
C42
2.2uF
C48
0.01uF
C41
0.01uF
C47
2.2uF
C52
2.2uF
C44
0.01uF
C55
2.2uF
C56
0.01uF
+5VCC
+5VCC
+5VCC
+5VCC
C54
2.2uF
C50
0.01uF
+5VCC
C51
2.2uF
C53
0.01uF
+VBD
B_CS
B_RD
B_CONVST
B_BYTE
BUSY
DB0
DB1
DB2
DB3
DB4
DB5
DB6 DB7 DB8 DB9 DB10 DB1
1
DB12 DB13
C46
0.01uF
C40
2.2uF
+5VCC
BUSY
DB[13...0]
B_CS
B_RD
B_BYTE
B_CONVST
-VCC
+VCC
C7
0.1uF
C31
1uF
C37
1uF
C15
0.1uF
R10
604
R13
10
C39
NI
+IN
C35
130pF
C33
1uF
R5
NI
EXT_REF
R4
100
DB[
13...0
]
R11
NI
TP4
3
1
2
SJP2
R6
604
+
C49
10uF
C8
2.2uF
C13
0.01uF
+VBD
C16
1500pF
+5VCC
C17
22uF
R21
75
R14
100
C61
NI
+VCC
C59
1uF
C36
0.1uF
-VCC
C32
0.1uF
C60
1uF
IN
1
OUT
2
GND
3
U3
NI
+5VCC
R3
NI
3
1
2 SJP1
3
1
2 SJP4
R24
0
C63
NI
1
2
3
R25
10k
1
2
SJP5
3
2
6
7
4
5
1
U1
OPA132
R8
49.9
3 1
2
SJP7
3 1
2
SJP6
*
3
2
6
7
4
5
1
8
U2
THS4031
C30
NI
*
TP9
R1
21
R2
NI
REFIN
1
REFOUT
2
NC
3
+VA
4
AGND
5
+IN
6
-IN
7
AGND
8
+VA
9
+VA
10
AGND
11
AGND
12
AG
ND
14
AG
ND
15
DB1
3
16
DB1
2
17
DB1
1
18
DB1
0
19
DB
9
20
DB
8
21
DB
7
22
DB
6
23
+V
BD
24
BDGND
25
DB5
26
DB4
27
DB3
28
DB2
29
DB1
30
DB0
31
N/C
32
N/C
33
+VBD
34
BDGND
35
BUSY
36
AP
W
D
37
pw
r_d
wn/R
ESE
T
38
BY
TE
39
CO
NV
ST
40
RD
41
CS
42
+V
A
43
AG
ND
44
AG
ND
45
+V
A
46
RE
FM
47
RE
FM
48
+V
A
13
U4
ADS7881/ADS7891
B_PWN/RST
B_PWN/RST
B_A_PWD
B_A_PWD
N/C
1
N/C
2
N/C
3
Anode
4
N/C
5
Cathode
6
N/C
7
Cathode
8
U9
REF1004-2.5
R9
49.9k
R12
21
Installed on ADS7881EVM
R13 : 12 Ohm
C16 : 1000pF C0G
U4 : ADS7881
Installed on ADS7891EVM
R13 =10 Ohm
C16 = 1500 pF C0G
U4 : ADS7891
Figure 5-2. Schematic Page 2: ADS7881, ADS7891
www.ti.com ADS78x1EVM Schematics
SLAU150A – DECEMBER 2004 – REVISED OCTOBER 2021
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