Datasheet
LTC2285
20
2285fb
APPLICATIONS INFORMATION
Evaluation Circuit Schematic of the LTC2285
C21
0.1µF
C27
0.1µF
V
DD
V
DD
V
DD
V
DD
V
DD
OV
DD
V
CMB
C20
2.2µF
C18 1µF
C23 1µF
C34
0.1µF
C31
*
C17
0.1µF
C14
0.1µF
C25
0.1µF
C28
2.2µF
C35
0.1µF
C24
0.1µF
C36
4.7µF
E3
V
DD
3V
E5
PWR
GND
V
DD
OV
DD
2285 AI01
C1
0.1µF
R32
OPT
R39
1k
R1
1k
R2
1k
R3
1k
R10
1k
R14
49.9
R20
24.9
R18
*
R24
*
R17
OPT
R22
24.9
R23
51
T2
*
C29
0.1µF
C33
0.1µF
J3
CLOCK
INPUT
U3
NC7SVU04
24
3
5
U4
NC7SV86P5X
C15
0.1µF
C12
4.7µF
6.3V
L1
BEAD
V
DD
C19
0.1µF
C11
0.1µF
C4
0.1µF
C2
2.2µF
C10
2.2µF
C9 1µF
C13 1µF
R15
1k
J4
ANALOG
INPUT B
QDV
DD
1
2
3
4
••
5
V
CMB
C8
0.1µF
C6
*
C44
0.1µF
R6
24.9
R5
*
R9
*
R4
OPT
R7
24.9
R8
51
T1
*
C3
0.1µF
C7
0.1µF
J2
ANALOG
INPUT A
1
2
3
5
••
4
V
CMA
V
CMA
12
V
DD
V
DD
34
2/3V
DD
56
1/3V
DD
78
GND
JP1 MODE
R34
4.7k
C39
1µF
V
DD
OV
DD
IN
BYP
OUT
15
U12
LT1761ES5-BYP
3
4
ADJ
C38
0.01µF
C46
0.1µF
E4
GND
C45
100µF
6.3V
OPT
C40
0.1µF
C48
0.1µF
C47
0.1µF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
E2
EXT
REF B
12
V
DD
34
V
CM
V
DD
V
CMB
56
EXT REF
JP3 SENSEB
E1
EXT
REF A
12
V
DD
34
V
CM
V
DD
56
EXT REF
JP2 SENSEA
C5
0.1µF
OV
DD
3
4
5
6
7
8
9
10
22
21
U2
FXLH42245MPX
20
19
18
17
16
15
14
2
U5
24LC025
A0
A1
A2
A3
V
CC
WP
SCL
SDA
1
2
3
4
8
7
6
5
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
80
82
84
86
88
90
92
94
96
98
100
79
81
83
85
87
89
91
93
95
97
99
QDV
DD
V
SS
SCL
SDA
R33
4.7k
ENABLE
V
CCIN
J1
EDGE-CON-100
R35
100k
1
4
5
3
2
+
C41
0.1µF
QDV
DD
C52
0.1µF
C55
0.1µF
C54
0.1µF
C53
0.1µF
R38
4.99k
R37
4.99k
R36
4.99k
SCL
V
CCIN
V
SS
SDA
ASSEMBLY TYPE
DC1098A-A
DC1098A-B
DC1098A-C
DC1098A-D
DC1098A-E
DC1098A-F
U1
LTC2281IUP
LTC2283IUP
LTC2285IUP
LTC2281IUP
LTC2283IUP
LTC2285IUP
R5, R9, R18, R24
24.9
24.9
24.9
12.4
12.4
12.4
C6, C31
12pF
12pF
12pF
8pF
8pF
8pF
T1, T2
MABAES0060
MABAES0060
MABAES0060
MABA-007159-000000
MABA-007159-000000
MABA-007159-000000
INPUT FREQUENCY
1MHz < A
IN
< 70MHz
1MHz < A
IN
< 70MHz
1MHz < A
IN
< 70MHz
70MHz < A
IN
< 140MHz
70MHz < A
IN
< 140MHz
70MHz < A
IN
< 140MHz
*VERSION TABLE
Msps
125
125
125
125
125
125
BITS
10
12
14
10
12
14
A
INA
+
A
INA
–
REFHA
REFHA
REFLA
REFLA
V
DD
CLKA
CLKB
V
DD
REFLB
REFLB
REFHB
REFHB
A
INB
–
A
INB
+
DA7
DA6
DA5
DA4
DA3
DA2
DA1
DA0
CLKOUT
DB13
DB12
DB11
DB10
DB9
DB8
DB7
GND
V
DD
SENSEA
VCMA
MODE
SHDNA
OEA
OF
DA13
DA12
DA11
DA10
DA9
DA8
OGND
OV
DD
GND
V
DD
SENSEB
VCMB
MUX
SHDNB
OEB
DB0
DB1
DB2
DB3
DB4
DB5
DB6
OGND
OV
DD
U1
LTC2285
A3
A2
A4
A5
A6
A7
OE
A1
A0
B3
B1
B0
124 23
V
CCA
V
CCB
V
CCB
OV
DD
OV
DD
QDV
DD
B2
B7
T/R
GND GND GNDGND
B5
B4
B6
EXPOSED
PAD
11 12 13 25
3
4
5
6
7
8
9
10
22
21
U11
FXLH42245MPX
20
19
18
17
16
15
14
2
A3
A2
A4
A5
A6
A7
OE
A1
A0
B3
B1
B0
124 23
V
CCA
V
CCB
V
CCB
OV
DD
QDV
DD
B2
B7
T/R
GND GND GNDGND
B5
B4
B6
EXPOSED
PAD
11 12 13 25
3
4
5
6
7
8
9
10
22
21
U10
FXLH42245MPX
20
19
18
17
16
15
14
2
A3
A2
A4
A5
A6
A7
OE
A1
A0
B3
B1
B0
124 23
V
CCA
V
CCB
V
CCB
OV
DD
QDV
DD
B2
B7
T/R
GND GND GNDGND
B5
B4
B6
EXPOSED
PAD
11 12 13 25
3
4
5
6
7
8
9
10
22
21
U9
FXLH42245MPX
20
19
18
17
16
15
14
2
A3
A2
A4
A5
A6
A7
OE
A1
A0
B3
B1
B0
124 23
V
CCA
V
CCB
V
CCB
OV
DD
QDV
DD
B2
B7
T/R
GND GND GNDGND
B5
B4
B6
EXPOSED
PAD
11 12 13 25
R42
1k
GND
C37
10µF
6.3V
R25
105k
R25
105k
C51
1µF
V
DD
QDV
DD
IN
BYP
OUT
15
U13
LT1761ES5-BYP
3
4
ADJ
C49
0.01µF
GND
C50
10µF
6.3V
R40
105k
R41
100k
2
2