DC1792A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
__
DESCRIPTION
APPROVED
PRODUCTION
2
MARK T.
DATE
2-23-11
D
D
CS#
SCK
MOSI
VCC
MISO
C29
RFLAG#
1
S0
1
3
JP4
2
17
23
18
JP5
2
3
20
21
22
19
JP6
2
3
C
1
S2
1
3
JP7
3
JP8
12
10
11
9
100pF 1206
CLR
LDAC
RFLAG
RFB
RFB
2
26
IOUT1
25
VOSADJ
R22
R23
1K
10K
R24
C33 10K
1uF
1206
VOSADJ
C32
R25
1uF
1206
+5V
1K
C34
OPT
5
ROFS
3
4
3
U11A
LTC6244CDD
R26
OPT
R28
10
-
E1
V-
V-
E2
C35
R30
1K
OPT
1206
V+
3
VOSADJ
E4
V+
+
JP1
6
EXT
GND
GND
4.02K
2
-
V-
U7
LT1012ACS8
EXT
2
GND
3
3
2
4
JP11
VOUT
C
7
E3
-
OPT
-5V
C31
100pF
VREF
1
GEADJ
U9
LT1360CS8
R29
U8
LTC2054CS5
2
V-
2
R27
V+
+
V+
+
6
+
1
1
2
REF
RCOM
3
3
RIN
IOUT2
GEADJ
5
4
7
GND
GND
GND
GND
GND
JP9
GND
3
24
1
16
15
13
8
6
2
MSPAN
-
1
S0
S1
S2
M-SPAN
FB
JP12
V+
28
27
2
S1
1206
C30
1
1
JP3
U1
LTC2756ACG
4
LDAC#
3
VDD
1
2
CLR#
OPT.
SRO
SDI
SCK
CS/LD
14
10K
0
2
1
VCC
7
R11-R17
V-
B
B
+5V
C36
0.1uF
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
C40
0.1uF
C41
0.1uF
C37
0.1uF
U11C
+5V
8
V+
VV-
LTC6244CDD
4
9
6
5
+
-5V
U11B
LTC6244CDD
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
0
0
0
0
5
0
0
0
1
0
10
0
0
1
0
-5
5
0
0
1
1
-10
10
0
1
0
0
-2.5
2.5
0
1
0
1
-2.5
7.5
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
A
SPAN
0
-
7
-5V
S3 S2 S1 S0
TECHNOLOGY
JW
MARK T.
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
18-BIT SOFT SPAN DAC W/SPI INTERFACE
SIZE
N/A
SCALE = NONE
2
DATE:
IC NO.
REV.
LTC2756ACG
DEMO CIRCUIT 1792A
2-23-11
2
SHEET 1
1
OF 2
A
5
4
3
2
1
MISO
MOSI
D
D
SCK
CS#
C7
1
12V
2
MISO
R2
10.0K
10
9
11
12
14
2
GND
GND
GND
13
8
3
SCL
SDA
WP
A2
A1
A0
C3
10uF
1206
R4
4.99K
JP10
VIN
VOUT
GND
TRIM
C2
10uF
1206
5
1
V+
AMP V+
3
E7
E8
D2
BAT54C
D3
BAT54C
1
B
C6
10uF
1206
C5
10uF
1206
AMP V-
C13
10uF
1206
C15
10uF
1206
IN
SHDN
GND
BYP
5
4
C18
10uF
1206
C19
10uF
1206
E10
A
T2
E11
OPT.
OPT.
R34
R33
OPT.
OPT.
CUSTOMER NOTICE
4
2
4
3
C20
10uF
1206
SD
GND
BYP
3
IN
OUT
5
C21
-5V
TECHNOLOGY
JW
MARK T.
B
0.01uF
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
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.
5
C11
10uF
1206
1
U6
LT1964ES5-5
R32
C10
0.01uF
2
V-
R31
C
+5V
OUT
E9
T1
VCC
E6
+5V
3
GND
2
4
U5
LT1761ES5-5
24LC025-I /ST
VCC
VCC REF
REG
6
6
5
7
3
2
1
1
4
VSS
VCC
C4
0.1uF
R3
4.99K
8
U4
5V JP2
EXT
2
6
U3
OPT
R5
4.99K
C
OUTS
3
MOSI
R1
88.7K
SD#
7
3
4
OUTF
1
ADJ
2
Vin
GND
SCK
GND
C1
10uF
1206
BAT54C
3
EEVCC
EESDA
EESCL
EEGND
AUX
CS#
6
4
7
5
2
CS
SCK/SCL
MOSI/SDA
MISO
2
2
V+
5V
1
2
1
3
5
GND
OUT
3
GND
IN
1
VREF
E5
8
D1
BYP
GND
1
5
V+
J1
HD2X7-079-MOLEX
VREF
U2
LTC6655
0.01uF
3
4
U10
LT1761ES5-BYP
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
18-BIT SOFT SPAN DAC W/SPI INTERFACE
SIZE
N/A
SCALE = NONE
2
DATE:
IC NO.
REV.
LTC2756ACG
DEMO CIRCUIT 1792A
2-24-11
2
SHEET 2
1
OF 2
A
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