Datasheet

1 2 3 4 5 6
A
B
C
D
6
54321
D
C
B
A
ti
12500 TI Boulevard. Dallas, Texas 75243
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Revision History
REV ECN Number Approved
DOCUMENT CONTROL #:
23
Analog-to-Digital Converter
A
DATE: 11-Nov-2004
Analog Circuits
6456873
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 DB11 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
31
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
Lijoy Philipose
Lijoy Philipose
C63
NI
1
2
3
R25
10k
12
SJP5
3
2
6
74
5
1
U1
OPA132
R8
49.9
31
2
SJP7
31
2
SJP6
*
3
2
6
74
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
AGND
14
AGND
15
DB13
16
DB12
17
DB11
18
DB10
19
DB9
20
DB8
21
DB7
22
DB6
23
+VBD
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
APWD
37
pwr_dwn/RESET
38
BYTE
39
CONVST
40
RD
41
CS
42
+VA
43
AGND
44
AGND
45
+VA
46
REFM
47
REFM
48
+VA
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