DC1925A - Schematic

5
4
3
2
1
ECO
REV
__
CLK
33 OHM
U2
NC7SVU04P5X
+9V/+10V
R45OPT
C68
15pF
COG
R44
0 OHM
0 - VREF
R55
0 OHM
C70
OPT
2
J2 BNC
AC
C64OPT
6
5
R47 OPT
R58
OPT
7
U18B
LT6203MS8
R39
0 OHM
R40
OPT
R36
OPT
R52
0 OHM
5
+
6
-
5
0402
0 OHM
R4
C551.0uF 25V
R500 OHM
V-
C581.0uF 25V
Q
3
5
4
2
CNVST_33
33 OHM
U4
NC7SVU04P5X
C570.1uF 25V
C44
1.0uF
25V
C13 +3.3V
0.1uF
JP6
FS
VREF
2
U6
NC7SZ66P5X
0.8VREF
3
SCK
SDO
BUSY
RDL/SDI
9
2
13
14
5
+3.3V
VCC
CNV
CNV
C
R85 33
11
B
SCK
SDO
12
C15
0.1uF
A
1
OE
4
4
2
J3-2
R13 1K
C16
0.1uF
GND
BUSY
U9
NC7SZ04P5X
R17
2K
3
TP5
RDL
R7
1K
DC590_DETECT
B
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
MSPS
BIT
LTC2378CMS-20
U1
1
20
-B
LTC2377CMS-20
0.5
20
-C
LTC2376CMS-20
0.25
20
V+
GND
C420.1uF 25V
C48
0.1uF
25V
C19
0.1uF
25V
C17
1.0uF
25V
GND
C40
1.0uF
25V
C47
0.1uF
25V
TP7
TP6
TP4
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
Q
R15
7
BYPASS CAPS FOR U10
V+
A
C49
1.0uF
25V
IN-
*
C56
0.1uF
C12
0.1uF
R51
10 OHMS
GND
5
PR
8
C4 0.1uF
R8
33 OHM
7
8
U1
LTC237XCMS-20
R9
0 OHM
0402
IN+
4
* ASSY
-A
BYPASS CAPS FOR U18
C43
0.1uF
25V
C73
6800pF
1206
NPO
C10
0.1uF
7
C66
OPT
V-
C71
6800pF
1206
NPO
U10B
LT6203MS8
C75
OPT
C62
10uF
6.3V
C72
3300pF
1206
NPO
C39 OPT
R56
OPT
C9
10uF
6.3V
REF
REF/DGCL
R48
10 OHMS
15
-
C65OPT
DC
C69
10uF
6.3V
2
C20
47uF
10V
1210
X7R
CHAIN
C63
R38
249
1
VCC
CLR
VREF
+2.5V
1
R46
0 OHM
OPT
C59
10uF
6.3V
D
C7
0.1uF
OVDD
4
3
R34 499
E5
B
3
+
R49
OPT
R33 499
C74
1.0uF
25V
JP8
COUPLING
C76
OPT
3
V-
C61 OPT
EXT
EXT_CM
R57
OPT
VR41
0 OHM
2
CP
C3 0.1uF
1
R18
249 VREF/2
1
1
C8
1.0uF
C6
10uF
6.3V
2
-
U18A
LT6203MS8
E3
VDD
+
2
JP4
CM
V-
C77
V- 0.1uF
25V
AIN-
5
GND
GND
GND
GND
3
R88
1 OHM
1
6
C46
2.2uF
10V
+3.3V
U10A
LT6203MS8
V+
V+
8
-
U5
LT6202CS5
2
R87
499
6
GND
VREF
C60
10uF
6.3V
5
4
C78
4.7uF
6.3V
GND
GND
LTC6655-5.0
+3.3V
7
3
6
16
10
R54
OPT
V+
V+
OUTS
0 OHM
OPT
3 +
GND
4
2
+3.3V
R37
0 OHM
VREF
R86
499
OUTF
8
10uF
6.3V
C67
OPT
C45
0.1uF
25V
GND
R30
R35
C
4
VIN
4
0 - VREF
2
R53
DC
C18
+
AC
0 OHM
3
SHDN
8
1
-
J4 BNC
AIN+
0.1uF
1
U15
1
2
JP7
COUPLING
D
+3.3V
5
4
C11
3
07-16-12
3
NC7SZ04P5X
U3
NL17SZ74
R3
2
DATE
G.HOOVER
5
5
4
APPROVED
3
R6
1K
R5
49.9
1206
U8
DESCRIPTION
PRODUCTION
2
R1
33 OHM
C2
0.1uF
3
5
2
3
CLK IN
100MHz MAX
3.3VPP
+3.3V
C1
0.1uF
R2
1K
C5
0.1uF
J1 BNC
D
+3.3V
1
+3.3V
REVISION HISTORY
3
2
APPROVALS
PCB DES.
M.HAWKINS
APP ENG.
G. HOOVER
TECHNOLOGY
TITLE: SCHEMATIC
SIZE
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
LOW NOISE, HIGH SPEED 20-BIT SAR ADC
IC NO.
REV.
LTC237XCMS-20 FAMILY
DEMO CIRCUIT 1925A
07-16-2012
1
2
SHEET 1
OF 2
A
4
IO17
IO18
IO19
IO20
IO21
IO33
DB18
IO34
DB19
8
IO35
15
IO36
CNVST_33
16
IO37
17
IO38
18
IO39
19
IO40
20
IO41
21
IO42
IO47
IO48
EPM240GT100C5N
IO49
IO50
IO54
30
33
SDO R14 33
SCK
RDL
BUSY
37
IO61
SCK
IO66
38
40
41
42
47
69
IO69
48
49
50
R60
10K
0402
C
DB0
R72 33
73
IO73
R73 33
DB1
IO92
IO95
DB2
75
IO75
R61 33
IO96
R67 33
DB19
DB9
92
95
R75 33
96
R76 33
DB10
CLKOUT
DB12
100
IO100
DB13
DB13
R77 33
DB14
DB11
R78 33
DB9
DB15
DB7
R59 1K 0402
64
10
9
(NC)
43
8
7
(NC)
44
6
5
22
4
3
23
2
1
24
25
GCLK1
C31
0.1uF
0402
C32
0.1uF
0402
C33
0.1uF
0402
A
C34
0.1uF
0402
C35
0.1uF
0402
C36
0.1uF
0402
C37
0.1uF
0402
C38
0.1uF
0402
DB2
DB0
DEV_CLRN
+9V/+10V
5
SHDN
R81
4.99K
8
TP1
5
+9V/+10V
GND
GND
GND
GND
GND
GND
GND
GND
10
11
32
46
60
93
65
79
4
TP2
5
6
TP3
7
8
9
10
11
12
13
14
SCK
U7
4
BYP
CNV
CNV
24LC024-I /ST
JP3
VCCI0
C26
10uF
6.3V
+2.5V
+3.3V
R27
2.8K
+2.5V
OUT
SEN
SHDN
BYP
1
2
R19
1K
C30
0.01uF
25V
SCL
SDA
WP
A2
A1
A0
3
2
1
WP
2
JP1
EEPROM
-9V / -10V
E8
2
PROG
C54
1.0uF
25V
J3
4
OUT
IN
SEN
SHDN
BYP
E4
1
2
4
R42
5.62K JP2
V+
C50
0.01uF
25V
R23
6.49K
V+
C52
10uF
25V
0805
8V
2
R43
1K
B
5V
3
1
IN
OUT
SHDN
GND
ADJ
5
R28
2K
JP5
V-
4
-3.6V
V2
GND
R29
1K
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
3
+2.5V
U17
LT1964ES5-SD
-9V/-10V
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
E2
V+
U16
LT1763CS8
6
5
7
DC590
PCB MTG. HOLES
C
C29
10uF
6.3V
EPM240GT100C5N
MH3 MH4
+3.3V
2
R26
1.54K
IN
R12
4.99K
3
VCCINT
VCCINT
VCCIO1
VCCIO1
VCCIO1
VCCIO2
VCCIO2
VCCIO2
3
R11
4.99K
D
4
R25
1.69K
C27
0.01uF
25V
C28
1.0uF
25V
5
R10
4.99K
+1.8V
C24
10uF
6.3V
E1
U14
LT1763CS8-2.5
J3-2
2
BYP
2
SEN
C51
1.0uF
25V
1
SHDN
C23
0.01uF
25V
1
OUT
+9V/+10V
TDO
C14
0.1uF
SEN
2
+3.3V
TCK
SCK
IN
E10
1
+3.3V
IN
8
MH1 MH2
5
5
C25
1.0uF
25V
TDI
+9V/+10V
OUT
C22
1.0uF
25V
U13
LT1763CS8
8
TMS
U11F
13
63
9
31
45
59
80
94
DB4
C21
22uF
25V
1210
E7
GND
EDGE-CON-100
R80
2K
0603
SDO
+3.3V
DB6
DEV_OE
EPM240GT100C5N
+1.8V
DB8
GCLK3
R24
1K
B
DB1
GCLK2
DB10
8
+1.8V
8
62
DB3
DB12
VCC
J5
JTAG
14
1K 0402
GCLK0
DB14
VSS
R22
R21
10K
U11E
DB5
4
+3.3V
R20 1K 0402
12
CLK
CLK2
DB15
99
IO99
DB16
E6
+9V/+10V
DB11
EPM240GT100C5N
+3.3V
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
89
91
93
95
97
99
DB18
DB17
R68 33
R74 33
98
IO98
EPM240GT100C5N
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
DB8
97
IO97
DB3
R66 33
91
IO91
74
IO74
90
IO90
72
IO72
R16
300
0402
EPM240GT100C5N
71
IO71
+3.3V
R71 33
DB7
89
IO89
70
IO70
88
IO88
68
R65 33
87
IO87
67
IO68
86
IO86
66
DB6
85
IO85
61
IO67
39
84
IO84
58
IO58
36
R64 33
83
IO83
57
IO57
82
IO82
56
IO56
81
IO81
55
IO55
34
35
54
DB5
U12
LT1763CS8-1.8
+9V/+10V
1
IO16
7
R83 33
DB17
29
IO78
R63 33
3
IO15
R82 33
IO30
IO53
78
1
IO8
6
IO29
DB16
53
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
77
IO77
3
IO7
R70 33
28
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
1
IO6
R69 33
5
52
IO52
DB4
3
IO5
4
IO28
CLKOUT
27
P1
R62 33
GND
GND
GND
D
R79 33
CLK2
IO27
76
IO76
3
6
7
IO4
3
CLKOUT
TP8
51
IO51
GND
GND
GND
IO3
R84 33
DC590_DETECT
GND
GND
GND
IO2
2
26
3
6
7
IO1
IO26
U11D
1
1
1
3
6
7
U11C
U11A
2
GND
GND
GND
U11B
3
3
6
7
5
2
APPROVALS
PCB DES.
M.HAWKINS
APP ENG.
G. HOOVER
TECHNOLOGY
E9
V-
C53
10uF
25V
0805
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
LOW NOISE, HIGH SPEED 20-BIT SAR ADC
IC NO.
REV.
SIZE
LTC237XCMS-20 FAMILY
N/A
SCALE = NONE
DATE:
DEMO CIRCUIT 1925A
07-16-2012
1
2
SHEET 2
OF 2
A
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