DC1485A - Schematic

4
3
V+
E8
REFADJ
100
C17
100pF
3
GND
2.7V
D2
BAT54C
2
1
V-
U10
74VHC595MTC
11
C
10
12
PARALLEL INTERFACE
13
R9
P1
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
HD2X20-100
G
S0
G
G
G
G
G
G
G
B
D17
D16
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
G
9
VCC Q'H 7
QH 6
C19
QG 5
0.1uF
QF 4
QE 3
8
GND QD 2
QC 1
QB 15
14
SER QA
AMP V-
D16
D14
D12
D10
D8
D6
D4
D2
D0
RCK
16
C18
10uF,25V
1206
E5
SCLR
D17
D15
D13
D11
D9
D7
D5
D3
D1
S2
S1
100
C23
100pF
SCK
S2
S1
S0
SCLR
RCK
U11
74VHC595MTC
R16
4.99K
9
VCC Q'H 7
QH 6
C25
QG 5
0.1uF
QF 4
QE 3
8
GND QD 2
QC 1
QB 15
14
SER QA
11
10
12
13
D17
D16
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
IOUT2F
IOUT2S
GND/IOUT3
13
8
3
A
2
3
4
100
R23
100
R25
10K
R28
20K
A0
VCC
A1
WP
A2
SCL
VSS
SDA
8
7
R29
4.99K
R30
4.99K
R31
10K
10
12
2
13
SCK
SCLR
RCK
G
2
3
C40
0.1uF
9
7
6
5
4
3
2
1
15
C16
OPT
0603
4
D5
BAT54C
2
+
2
-
C6
0.1uF
RVOS
GND
J2
OPT
U5
LT1360CS8
6
C12
0.1uF
D
V- C15
OPT 0603
R5
10
0603
R6
4.02K
0603
R7
1K
0603
4
E9
RVOS
39
JP5
C
3
2
1
EXT
GND
U15
LT1761ES5-5
2
3
VIN
+5V
OUT
5
GND
SHDN
BYP
MANUAL SPAN CONTROL
C35
C36
0.01uF 10uF,25V
1206
4
SHDN
GND
VIN VOUT_F
GND VOUT_S
GND
GND
U16
LT1964ES5-5
8
1
C37
1uF
25V
0603
7
6
2
3
GND
VCC
1
3
NC
2
VIN
C30
10uF,25V 3 NC
1206
4
GND
NC
NC
VOUT
TRIM
C41
10uF,25V
1206
SHDN
3
4
C38
0.01uF
E6
8
5V
6
5
EXT
JP3
1
3
5
5 1
3 MSPAN
1
0
HD2X3-079
2 REF
4
6
REG
HD2X3-079
VREF
VCC
E7
5V
VCC
CONTRACT NO.
APPROVALS
TECHNOLOGY
DRAWN:
CHECKED:
APPROVED:
S2 S1 S0
SPAN
0
0
0
0
5
0
0
1
0
10
0
1
0
-5
5
0
1
1
-10
10
1
0
0
-2.5
2.5
1
0
1
-2.5
7.5
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
18-BIT PARALLEL INPUT, CURRENT OUTPUT DAC WITH READBACK
ENGINEER: LEO C.
DESIGNER: KIM T.
SIZE
A
DATE:
2
B
C39
10uF,25V
1206
VREF
7
JP2
6
4
2
S0
-5V
IN
BYP
JP1
1 6
5
4
3 S1
2
1
0
HD2X3-079
V-
CUSTOMER NOTICE
5
5
5
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
CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
6
S2
OUT
U8
LT1236ACS8-5
1
3
-5V
5
U6
LTC6655AHMS8-5
V+
V+
7
+
0603
R19 4.99K
4
U13
NC7SZ14P5X
4
-
3
C20
100pF
1206
U4
LTC6240CS5
1
C10
0.1uF
6
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
1206
C34
1uF
25V
0603
G
U12
74VHC595MTC
11
R26
10K VCC
C31
0.1uF
R27
4.99K
U14
24LC025-I /ST
1
R22
R3
1K
-5V C14
1uF
UPD
D_/S
WR_
CLR_
MSPAN
RCK
C29
0.1uF
5
C33
0.1uF
100
+
V+
3
R24
10K
R21
-
3
U3
LTC2054CS5
1
C11
0.1uF
1
SCLR
VCC Q'H
QH
QG
QF
QE
8
GND QD
QC
QB
14
SER QA
CS/ CLK SDI SDO
5V
GND
GND
GND
1
V+ 2
5V
6
CS 4
SCK/SCL 7
MOSI/SDA 5
MISO
10
EEVCC 9
EESDA 11
EESCL 12
EEGND 14
AUX
4
R8
1K
0603
R17
4.99K
R18
4.99K
SCK
16
40
C4
0.1uF
C5
100pF
1206
READ
1
100
C28
100pF
4
IOUT1
R20
J1
HD2X7-079-MOLEX
0603
C9
1uF
0805
C3
0.1uF
U1
LTC2757CLX
3
38 S2
37 S1
S0
R11
4.99K
G
16
D_/S
READ
WR_
CLR_
MSPAN
UPD
8
9
10
11
12
13
14
15
16
23
24
25
26
27
28
29
30
31
+5V
R2
10K
VREF
+5V
NC
NC
2
1
13
R4
C21
OPT
GND
GND
GND
12
C13
10uF,25V
1206
SCK
MSPAN
10
D1
BAT54C
R1
10K
0603
1206
18
19
7
3
AMP V+
V-
21
11
-
17
VDD
48
REFADJ 1
RINS 2
RINF
47
RCOM
46
REFF 45
REFS 43
ROFSF 44
ROFSS 42
RFBS 41
RFBF
V+
E3
+
2
VCC
C8
0.1uF
33
34
35
36
20
VinD
3
E2
4
9
VCC Q'H 7
QH 6
C2
QG 5
0.1uF
QF 4
QE 3
8
GND QD 2
QC 1
QB 15
14
SER QA
U2
LT1012ACS8
6
C7
0.1uF
5
16
2. INSTALL SHUNTS ON JUMPERS AS SHOWN.
E1
VOUT
VOUT
3
2
1
2
EXT
GND
C1
0.1uF
5
U9
74VHC595MTC
VCC
D_/S
READ
UPD
WR_
CLR_
1. ALL RESISTORS ARE IN OHMS, 0402.
ALL CAPACITORS ARE IN MICROFARADS, 0402.
7
JP4
1
2
NOTES: UNLESS OTHERWISE SPECIFIED
E4
2
22
32
5
DWG NO.
REV
DC1485A-2 * LTC2757CLX
Wednesday, July 29, 2009
SHEET 1
1
2
OF 1
A
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