Datasheet
AD2S1200/AD2S1205 User Guide UG-365
Rev. D | Page 15 of 24
EVALUATION BOARD SCHEMATICS AND ARTWORK
Figure 18. Schematic Page 1
10442-017
Note on Excitation Buffer Circuitry
Two modes of operation:
Dual Op-Amp per Exc signal :
Insert R49, R50, R51, R52, R70, R72, R77 & R71
Single Op-Amp per Exc signal :
Insert R53, R19, R20, R56, R69, R73, R78 & R79
**. Place as close to U1 as possible
**
**
**
**
Join under U1
CLKIN
1
DVDD
2
RD
3
CS
4
SAMPLE
5
RDVEL
6
SOE
7
DB11/SO
8
DB10/SCLK
9
DB9
10
DB8
11
DB7
33
RESET
32
FS2
31
FS1
30
LOT
29
DOS
28
DIR
27
NM
26
B
25
A
24
CPO
23
DGND
34
EXC
35
EXC
36
AGND
37
SIN
38
SINLO
39
AVDD
40
COSLO
41
COS
42
AGND
43
REFBYP
44
REFOUT
22
CLKIN
21
XTALOUT
20
DB0
19
DB1
18
DB2
17
DVDD
16
DGND
15
DB3
14
DB4
13
DB5
12
DB6
U1
AD2S1200
R54
10K
R55
10K
R74
22K
R75
10K
J5-1
J5-2
J5-3
J5-4
J6-1
J6-2
Y1
8.192MHz
C7
22pF
C8
22pF
T_CPO
T_REFOUT
T_EXC_OUT
T_EXC_OUT
T_SIN
T_SINLO
T_COSLO
T_COS
T_EXC
T_EXC
R76
B
A
LK5
LINK-2-R0603
B
A
LK6
LINK-2-R0603
C5
0.1uF
C3
10nF
+
C4
10uF
J1
3
+
2
-
1
U7-A
AD8664ARZ
5
+
6
-
7
U7-B
AD8664ARZ
R9
DNI
R10
15k4
R12
8K66
C1
120pF
E
B
C
Q1
E
B
C
Q2
R13
4R7
R14
4R7
R15
2K2
D1
D19
R18
2K2
A
B
C
LK8
R16
3R3
R44
3R3
R53
0r
R49
DNI
R50
DNI
R19
0r
R51
DNI
R20
0r
R56
0r
R52
DNI
12
+
13
-
14
U7-D
AD8664ARZ
10
+
9
-
8
U7-C
AD8664ARZ
R31
DNI
R39
15k4
R40
8K66
C6
120pF
E
B
C
Q13
E
B
C
Q14
R47
4R7
R48
4R7
D3
D4
R65
2K2
R66
2K2
A
B
C
LK7
R67
3R3
R68
3R3
R69
0r
R70
DNI
R71
DNI
R72
DNI
R73
0r
R77
DNI
R78
0r
R79
0r
4
11
U7-E
R21
68k
R22
68k
R23
0R
R24
0R
R25
0R
R26
0R
C2
1uF 12mR
C9
1uF 12mR
C10
10nF
C11
10nF
+
C12
10uF
C13
10nF
+
C14
10uF
C15
10nF
+
C16
10uF
X1
CLAMP-10MM
C27
C33
DB11/SO
DB10/SCLK
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
DVDD
DVDD
A
B
NM
DIR
DOS
LOT
+12V
VREF
COS
COSLO
SINLO
SIN
COS
COSLO
SINLO
SIN
EXC
EXC
AVDD
RESET
RD
CS
SAMPLE
RDVEL
DVDD
REFOUT
+12V
+12V
VREF
EXC
+12V
VREF
EX
C
DGND
AGND