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Figure 7-4
shows the ADC decoupling, digital connections, and reference connections.
AVDD
C1
1µ F
C2
1µ F
C6
C3
1µ F
1µ F
C7
C4
1µ F
1µ F
GND
GND
U2B
26
AVDD
AG ND
34
AVDD
AG ND
35
AVDD
AG ND
40
AVDD
AG ND
41
AVDD
AG ND
46
AVDD
AG ND
47
AVDD
AG ND
50
AVDD
AG ND
60
AVDD
AG ND
AG ND
AG ND
BV DD
AG ND
9
BVDD
BG ND
31
HVD D
HVDD
HVSS
C28
1µ F
ADS85 55SPM R
C27
1µ F
GND
GND
CONVST _A
CONVST _B
CONVST _C
JP06
EXT
AVDD
U6A
2
6
VIN
VOUT
5
TRIM/NR
3
4
TEMP
GN D
C37
C39
1µ F
REF502 5AID G KR
100 nF
0.2 2
GND
GND
GND
SLAU298A – NOVEMBER 2009 – REVISED MAY 2021
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25
32
37
38
43
44
49
52
53
55
57
59
8
GND
30
GND
HVSS
C5
1µ F
GND
U2A
CH_A0
33
18
CH _ A0
BU SY/INT
27
RANGE/XCLK
R97
23
62
CON VST_A
HW/ SW
49. 9
63
REFE N /WR
C71
54
24
GND
REFC_A
STBY
10u F
28
RESET
CH_A1
36
CH _ A1
19
CS/FS
20
RD
CH_B0
39
29
CH _ B0
WORD/BY TE
61
PAR/SER
R98
22
CON VST_B
49. 9
17
DB0 /SE L_A
C72
56
16
REFC_B
DB1 /SE L_B
GND
10u F
15
DB2 /SE L_C
CH_B1
42
14
CH _ B1
DB3 /D CIN _ C
13
DB4 /D CIN _ B
12
DB5 /D CIN _ A
CH_C0
45
11
CH _ C0
DB6 /SCLK
10
DB7 /H BEN/DCE N
R99
21
7
CON VST_C
DB8 /SDO_A
49. 9
6
DB9 /SDO_B
C73
58
5
REFC_C
DB1 0/SD O_ C
GND
10u F
4
DB1 1
CH_C1
48
3
CH _ C 1
DB1 2
2
DB1 3/SD I
1
DB1 4/REFBU F EN
51
64
REFIO
DB1 5
TP 8
VREF
ADS85 55SPM R
C40
INT
470 nF
25V
R47
0
GND
R48
C38
10u F
Figure 7-4. ADC, Reference, and Digital I/O Schematic
Copyright © 2021 Texas Instruments Incorporated
BV DD
R49
R50
100 k
100 k
J4
WORD/BYTE
1
RESET
3
RAN G E/XCLK
5
STBY
7
CONVST _A
9
10
CONVST _B
11
12
CONVST _C
13
14
~RD
15
16
CS/FS
17
18
BUSY/INT
19
20
TSW-110 -07-G-D
R71
BUSY/INT
R72
49. 9
RAN G E/XCLK
49. 9
R73
HW/SW
J3
R74
49. 9
REFEN/WR
DB0/SEL_ A
1
49. 9
R75
STBY
DB1/SEL_ B
3
R76
49. 9
RESET
DB2/SEL_ C
5
49. 9
R77
CS/FS
DB3/DCIN_C
7
R46
49. 9
~RD_RETURN
DB4/DCIN_B
9
10
R78
49. 9
~RD
DB5/DCIN_A
11
12
49. 9
R79
WORD/BYTE
DB6/SC L K
13
14
R80
49. 9
PAR/SER
DB7/HBEN/DCEN
15
16
49. 9
DB8/SD O _A
17
18
R81
DB0/SEL_ A
DB9/SD O _B
19
20
R82
49. 9
DB1/SEL_ B
DB10/SDO_C
21
22
49. 9
R83
DB2/SEL_ C
DB11
23
24
R84
49. 9
DB3/DCIN_C
DB12
25
26
49. 9
R85
DB4/DCIN_B
DB13/SDI
27
28
R86
49. 9
DB5/DCIN_A
DB14/REFBUFEN
29
30
49. 9
R87
DB6/SC L K
DB15
31
32
R35
49. 9
SCLK_ RET U RN
49. 9
TSW-116 -07-G-D
BV DD
R88
DB7/HBEN/DCEN
49. 9
R89
DB8/SD O _A
R90
49. 9
DB9/SD O _B
R55
R56
R57
100 k
100 k
100 k
49. 9
R91
DB10/SDO_C
R92
49. 9
DB11
J5
49. 9
R93
DB12
REFEN/WR
1
R94
49. 9
DB13/SDI
HW/SW
3
49. 9
R95
DB14/REFBUFEN
PAR/SER
5
R96
49. 9
DB15
49. 9
TSW-103-07-G-D
GND
Bill of Materials, Layout, and Schematics
TP 1
J2
5.5 V
DNP
2
1
2
1
4
3
4
3
WORD/BYTE
6
5
6
5
RESET
8
7
DB0/SEL_ A
8
7
RAN G E/XCLK
10
9
DB1/SEL_ B
10
9
STBY
12
11
DB2/SEL_ C
12
11
14
13
DB3/DCIN_C
14
13
CONVST _A
16
15
DB4/DCIN_B
16
15
CONVST _B
18
17
DB5/DCIN_A
18
17
CONVST _C
20
19
DB6/SC L K
20
19
CS/FS
22
21
DB7/HBEN/DCEN
22
21
24
23
DB8/SD O _A
24
23
~RD
26
25
DB9/SD O _B
26
25
2
~RD_RETURN
28
27
DB10/SDO_C
28
27
4
BUSY/INT
30
29
DB11
30
29
6
REFEN/WR
32
31
DB12
32
31
8
34
33
DB13/SDI
34
33
36
35
DB14/REFBUFEN
36
35
38
37
DB15
38
37
40
39
SCLK_ RET U RN
40
39
42
41
42
41
44
43
44
43
BV DD
46
45
46
45
HW/SW
48
47
48
47
EVM _ID_WP
50
49
50
49
52
51
52
51
PAR/SER
54
53
EVM _ID_PWR
D7
C75
54
53
GND
EVM _ID_SDA
56
55
Ze ner
10u F
56
55
EVM _ID_SCL
58
57
3.6 V
58
57
2
60
59
60
59
4
6
MP1
MP3
GN D
GN D
8
GND
MP2
MP4
GN D
GN D
QT H-030 -01-L-D-A
GND
GND
2
4
6
GND
EVM _ID_PWR
EVM _ID_PWR
C74
R101
S1
U3
10. 0k
1
8
1
A0
VCC
100 nF
GND
2
7
2
A1
W P
3
6
EVM _ID_SCL
3
A2
SCL
4
5
EVM _ID_SDA
VSS
SDA
BR24G32 FVT-3AGE2
GND
R102
EVM _ID_WP
0
ADS8555EVM-PDK Evaluation Module
GND
25
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