Datasheet
LTC2378-20
25
237820f
For more information www.linear.com/LTC2378-20
boarD layouT
Partial Schematic of Demoboard
C68
15pF
COG
C58
1µF
25V
BYPASS CAPACITORS FOR U10
V
+
C42
0.1µF
25V
R54
OPT
C67
OPT
C18
10µF
6.3V
R55
0Ω
1
2
3
AC DC
JP7
COUPLING
AC DC
JP8
COUPLING
C66
OPT
C69
10µF
6.3V
C70
OPT
R56
OPT
C47
0.1µF
25V
C19
0.1µF
25V
1
2
3
J4
BNC
J2
BNC
R53
0Ω
A
IN
+
0 – V
REF
A
IN
–
0 – V
REF
U6
NC7SZ66P5X
C13
0.1µF
4
12
9
CNV
SCK
C20
47µF
10V
1206
X7R
C56
0.1µF
CNV
REF
GND
GND
GND
GND
REF/DGC
V
DD
V
REF
0.8V
REF
OV
DD
SCK
SDO
BUSY
RDL/SDI
SDO
BUSY
RD
LTC2378-20
IN
–
IN
+
5
4
3
2
1
5
4
13
14
11
12
B A
5
3
GND
V
CC
OE
+3.3V
R5
49.9Ω
1206
R6
1k
U8
NC7SZ04P5X
U2
NC7SVU04P5X
U15
LTC6655AHMS8-5
U3
NL17SZ74
U4
NC7SVU04P5X
CNVST_33
FROM CPLD
CLK
TO CPLD
C5
0.1µF
C1
0.1µF
C11
0.1µF
SHDN
GND
GND
OUT_F
GND
GND
9V TO 10V 1
2
3
4
8
7
6
5
+3.3V +3.3V +3.3V
3
42
5
3
42
5
C2
0.1µF
R3
33Ω
R2
1k
R1
33Ω
+3.3V
+3.3V
3
1
4
6
2
8
7
5
R8
33Ω
C3
0.1µF
R15
33Ω
C4
0.1µF
V
IN
OUT_S
GND
V
CC
CLR\
Q\
CP
Q
D
PR\
3
4 2
5
+3.3V
DC590 DETECT
TO CPLD
+3.3V
U9
NC7SZ04P5X
C15
0.1µF
C16
0.1µF
3
4
2
5
+3.3V
R13
1k
R17
2k
R10
4.99k
U7
24LC025-I/ST
R11
4.99k
R12
4.99k
C14
0.1µF
6
8
4
237820 BL
5
7
3
2
1
SCL
SDA
ARRAY
EEPROM
WP
A2
A1
A0
V
SS
V
CC
1
3
5
7
9
11
13
2
4
6
8
10
12
14
J3
DC590
SDO
SCK
CNV
9V TO
10V
R7
1k
10
16
6
3
1
15
7
2
8
JP6
FS
1
2
3
HD1X3-100
OPT
C7
0.1µF
C6
10µF
6.3V
+2.5V
C10
0.1µF
C71
6800pF
NPO
C72
3300pF
1206 NPO
R51
10Ω
C73
6800pF
NPO
C9
10µF
6.3V
R9
0Ω
R4
0Ω
R48
10Ω
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
DB19
1
3
5
7
11
9
13
15
17
19
21
23
25
27
29
31
33
35
37
39
P1
40
42
44
46
48
50
52
54
DB18
DB17
DB16
CLKOUT
CLK2
41
43
45
47
49
51
53
55
CLK
IN
J1
V
+
V
–
R46
0Ω
R44
OPT
C76
OPT
–
+
R45
OPT
U10A
LT6203MS8
C65
OPT
5
6
7
R49
OPT
R50
0Ω
R52
0Ω
R58
OPT
C75
OPT
–
+
R47
OPT
U10B
LT6203MS8
U18B
LT6203MS8
C39
OPT
R39
0Ω
7
5
6
+
–
R38
249Ω
R34
499Ω
C62
10µF
6.3V
R40
OPT
C59
10µF
6.3V
C60
10µF
6.3V
C77
0.1µF
25V
C45
0.1µF
25V
R36
OPT
R35
OPT
R80
2k
0603
EDGE-CON-100
3.3V
C64
OPT
R33
499Ω
C63
OPT
3
2
1
5
4
V
+
V
–
R41
0Ω
–
+
R30
0Ω
U18A
LT6203MS8
C61
OPT
R57
OPT
JP4
CM
E5
EXT_CM
1
2
3
V
REF/2
V
REF
EXT
C8
1µF
C74
1µF
25V
R18
249Ω
3
2
1
5
4
V
+
V
–
–
+
R88
1Ω
U5
LT6202CS8
R86
499k
C78
4.7µF
6.3V
R87
499k
C40
1µF
25V
C17
1µF
25V
V
–
C55
1µF
25V
BYPASS CAPACITORS FOR U18
V
+
C57
0.1µF
25V
C48
0.1µF
25V
C43
0.1µF
25V
C49
1µF
25V
C44
1µF
25V
V
–
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
DB15
DB14
DB13
DB12
DB11
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
89
91
93
94
96
98
100
DB2
DB1
DB0
95
97
99
R81
4.99k