1
dc1684aabfb
DEMO MANUAL
DC1684A-A/DC1684A-B
Description
LTC2758/LTC2752
Dual SPI IOUT
18-Bit/16-Bit DACs
Demonstration circuit 1684A-A features the LT C
®
2758A
18-bit SoftSpan™ IOUT DAC. DC1684A-B features the
pin-compatible 16-bit LTC2752A. The digital interface is
a simple, 4-wire Serial Peripheral Interface (SPI), aug-
mented with separate CLEAR and LDAC pins that reset
the output to zero and load the DAC code, respectively.
These devices feature six output ranges: 0V to 5V
, 0V to
10V, ±5V, ±10V, ±2.5V, and –2.5V to 7.5V. These ranges
are programmable through the SPI interface or through
separate span control pins if SoftSpan operation is not
needed. Voltage input offset and gain adjustment pins
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks
and SoftSpan and QuikEval are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
BoarD photo
facilitate trimming of residual DC errors without impacting
the excellent temperature stability of this device.
The DC1684A-B uses LT
®
1468 amplifiers recommended
for 16-bit applications. The DC1684A-A uses low noise,
low offset LT1012A amplifiers for reference inversion, and
a composite amplifier for I-V conversion that provides
18-bit accuracy and fast settling. Amplifier selection is
detailed in the LTC2758 and LTC2752 data sheets.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1684A
dc1684aa/ab F01
ANALOG POWER
SUPPLY
(NORMALLY ±15V)
DAC
CONNECTIONS
RIBBON CABLE TO
DC590 CONTROLLER
Figure 1. Connection Diagram
2
dc1684aabfb
DEMO MANUAL
DC1684A-A/DC1684A-B
Quick start proceDure
Figure 2. Software Screenshot
Connect a low noise ±15V power supply to the AMPV+,
GND, and AMPV– turret posts on the DC1684A board.
Connect J1 to a DC590 USB serial controller using the
supplied 14-conductor ribbon cable. Connect DC590 to a
host PC with a standard USB A/B cable. Run the evaluation
software supplied with the DC590, or download it from
www.linear.com/software. The correct control panel will
be loaded automatically (shown in Figure 2). The software
automatically sets the LTC2758A / LTC2752A outputs ac-
cording to the entries in the control panel. A square wave
option is available to test the settling time. The MSPAN
jumper should be set to 0 if software span control is de-
sired. Setting MSPAN high (1) causes the S2, S1 and S0
pins to set the span according to the table printed on the
board. The corresponding span should be selected in the
software to ensure that the calculated DAC code is correct.
Additional software documentation may be available from
the Help menu item, as features may be added periodically.
3
dc1684aabfb
DEMO MANUAL
DC1684A-A/DC1684A-B
harDware setup
JUMPERS
MSPAN: Manual Span Control Pin. MSPAN is used to
configure the LTC2758/LTC2752 for operation in a single,
fixed output range. If MSPAN is 1, it will be configured for
single span use. If MSPAN is 0, it will be set through the
QuikEval™ software. Default position is 0 (low).
S0, S1, S2: Used to set the fixed output range if MSPAN
is 1.
Table 1. MSPAN Configuration
S2 S1 S0 SPAN
0 0 0 0V to 5V
0 0 1 0V to 10V
0 1 0 ±5V
0 1 1 ±10V
1 0 0 ±2.5V
1 0 1 –2.5V to 7.5V
GEADJA, GEADJB: Gain Adjust Pins. If no adjustments are
required, select GND. Selecting EXT connects the pin to
the turret, allowing external adjustment to null gain error
or compensate for reference errors.
VOSADJA,VOSADJB: Offset Adjustment Selection for
DACA or DACB. If no offset adjustment is required, select
GND. Selecting EXT connects the offset pin to the turret,
allowing external adjustment of offset.
VREFA,VREFB: Select Source for VREF on Either DACA
or DACB. 5V connects to onboard LTC6655 5V reference;
EXT connects to the turret, allowing an external reference
to be used.
VCC: Select Source for 5V VCC Supply. Set to 5V for sup-
ply by on-board LTC6655 reference (recommended). Set
to REG to be supplied by regulated supply from DC590
controller and remove the jumper to supply externally.
CLR: Asynchronous Clear Input. Tie to 0 to set all DAC
outputs to 0V.
LDAC: Asynchronous DAC Load Input. Tie to 0 to update
all DACs if CS is high.
RFLAG: Reset Flag Output. Remove jumper and probe
middle pin for RFLAG status.
ANALOG CONNECTIONS (TURRET POSTS)
OUTA/B: DAC Voltage Outputs.
VREFA/B: DAC Reference Voltages. If the on-board LTC6655
references are selected, the voltage may be measured at
these points. If a remote reference is selected, then an
external reference must be applied to these points.
VOSADJA/B: DAC Offset Adjust Inputs. Use only if the VOSA
jumper is set to EXT. The nominal range of these pins is
±5V, which will provide ±2048LSB of offset adjustment.
GEADJA/B: Gain Adjust Pins. These voltage-control pins
can be used to null gain error or to compensate for refer-
ence errors. The nominal range of these pins is ±5V, which
will provide ±2048LSB of gain adjustment.
POWER AND GROUND CONNECTIONS
Analog Power: The AMPV+, AMPV–, and GND turret
posts are the analog supplies for the on-board DAC ampli-
fiers. These should be connected to a well regulated, low
noise ±15V power supply.
VCC: Connection to VCC. See the Schematic Diagrams
and the description for the VCC jumper.
Grounding: Separate power and signal grounds are pro-
vided. Signal grounds are the turrets closest to OUTA and
OUTB. Use these for measurement ground and output
return. Power GND is between the AMPV+ and AMPV –
turrets.
4
dc1684aabfb
DEMO MANUAL
DC1684A-A/DC1684A-B
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 15 C1, C2, C3, C5, C6, C11-C20 CAP., X5R, 10µF, 10V, 20%, 1206 TDK, C3216X5R1A106M
2 8 C4, C7, C36, C37, C38, C39,
C40, C41
CAP., X7R, 0.1µF, 10V, 10%, 0603 AVX, 0603ZC104KAT2A
3 2 C10, C21 CAP., X7R, 0.01µF, 10V, 10%, 0603 AVX, 0603ZC103KAT2A
4 2 C22, C31 CAP., COG, 100pF, 50V, 10%, 0603 AVX, 06035A101KAT2A
5 0 C23, C29 (OPT.)
6 0 C27, C34 (OPT.) CAP., 0603
7 3 D1, D2, D3 DIODE, BAT54C, SOT23 DIODE, ZETEX, BAT54C-7-F
8 1 J1 CONNECTOR, HD2X7-079 MOLEX, 87831-1420
9 14 JP1-JP14 3-PIN, 0.079", SINGLE ROW HEADER SAMTEC, TMM103-02-L-S
10 14 XJP1-XJP14 SHUNT, 0.079", CENTER SAMTEC, 2SN-BK-G
11 2 JP15, JP16 0.01" JUMPER, SHUNT, SOLDER DOWN SAMTEC, JL-100-25-T
12 1 R1 RES., CHIP, 88.7k, 1/16W, 1%, 0603 VISHAY, CRCW060388K7FKEA
13 5 R2, R31-R34 RES., CHIP, 10k, 1/16W, 1%, 0603 NIC, NRC06F1002TRF
14 3 R3, R4, R5 RES., CHIP, 4.99k, 1/16W, 1%, 0603 NIC, NRC06F4991TRF
15 7 R11-R17 RES., CHIP, 10k, 1/16W, 5%, 0603 NIC, NRC06J103TRF
16 16 TP1-TP16 TURRET, TEST POINT MILL-MAX, 2308-2-00-80-00-00-07-0
17 1 U2 I.C., LTC6655CHMS8-5, MSOP-8 LINEAR TECHNOLOGY, LTC6655CHMS8-5#TRPBF
18 0 U3 (OPT.) I.C., LT1236ACS8-5, SO-8
19 1 U4 I.C., 24LC025, TSSOP-8 MICROCHIP, 24LC025 I /ST
20 1 U5 I.C., LT1761ES5-5, SOT23-5 LINEAR TECHNOLOGY, LT1761ES5-5#TR
21 1 U6 I.C., LT1964ES5-5, SOT23-5 LINEAR TECHNOLOGY, LT1964ES5-5#TRPBF
22 1 U10 I.C., LT1761ES5-BYP, SOT23-5 LINEAR TECHNOLOGY, LT1761ES5-BYP#TRPBF
5
dc1684aabfb
DEMO MANUAL
DC1684A-A/DC1684A-B
parts List—1684a-a
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 1684A GENERAL BOM
2 2 C24, C30 CAP., COG, 100pF, 50V, 5%, 1206 AVX, 12065A101JAT2A
3 4 C25, C26, C32, C33 CAP., X7R, 1µF, 16V, 10%, 1206 AVX, 1206YC105KAT2A
4 0 C28, C35 (OPT.) CAP., 1206
5 6 R6, R9, R21, R22, R25, R30 RES., CHIP, 1k, 1/16W, 5%, 0603 VISHAY, CRCW06031K00JNEA
6 4 R7, R8, R23, R24 RES., CHIP, 10k, 1/16W, 5%, 0603 NIC, NRC06J103TRF
7 0 R10, R20, R26, R29 (OPT.) RES., CHIP, 0603
8 2 R18, R27 RES., CHIP, 4.02k, 1/16W, 1%, 0603 YAGEO, RC0603FR-074K02L
9 2 R19, R28 RES., CHIP, 10, 1/16W, 5%, 0603 NIC, NRC06J100TRF
10 1 U1 I.C., LTC2758ACLX, 48-LX LINEAR TECHNOLOGY, LTC2758ACLX#TRPBF
11 2 U7, U14 I.C., LT1012ACS8, SO-8 LINEAR TECHNOLOGY, LT1012ACS8#TRPBF
12 2 U8, U12 I.C., LT1360CS8, SO-8 LINEAR TECHNOLOGY, LT1360CS8#TRPBF
13 2 U9, U13 I.C., LTC2054HVCS5, TSOT23-5 LINEAR TECHNOLOGY, LTC2054HVCS5#TRPBF
14 1 U11 I.C., LTC6244HVCDD, 8-PIN-3×3, DD LINEAR TECHNOLOGY, LTC6244HVCDD#TRPBF
parts List—1684a-B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 1684A GENERAL BOM
2 0 C24, C25, C26, C30, C32, C33 (OPT.) CAP., 1206
3 2 C28, C35 CAP., COG, 33pF, 50V, 5%, 1206 AVX, 12065A330JAT2A
4 0 R6-R9, R18, R19, R21-R25, R27, R28 RES., 0603
5 0 R30 (OPT.)
6 4 R10, R20, R26, R29 RES., CHIP, 0, 1/16W, 0603 VISHAY, CRCW06030000Z0EA
7 1 U1 I.C., LTC2752ACLX, 48-LX LINEAR TECHNOLOGY, LTC2752ACLX#TRPBF
8 4 U7, U8, U12, U14 I.C., LT1468CS8, SO-8 LINEAR TECHNOLOGY, LT1468CS8#TRPBF
9 0 U9, U13 (OPT.) I.C., TSOT23-5
10 0 U11 (OPT.) I.C., 8-PIN-3×3,DD
6
dc1684aabfb
DEMO MANUAL
DC1684A-A/DC1684A-B
schematic Diagrams
Figure 3. DC1684A Dual, SPI, IOUT, 18-/16-Bit DAC
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
2. INSTALL SHUNTS AS SHOWN.
GEADJB
CLR#
LDAC#
RFLAG#
S0
S1
S2
MSPAN
10
GEADJA
OUTB
GND
OUTA
GND
2/3/2011
EXT
GND
VOSADJA
VOSADJB
EXT
GND
EXT
GND
EXT
GND
ASSY
-A
-B
-BIT
18
16
U1
LTC2758ACLX
LTC2752ACLX
U8, U12 U9,U13
LT1360CS8
U11
LT1468CS8
LTC2054HVCS5 LTC6244HVCDD
ASSY
-A
-B
C24
100pF
C25 C26 C28
1uF
ASSY
-A
-B
R6 R7 R8 R9
C30 C32 C33 C35
R10 R19 R20 R22 R24 R25 R27R26R23 R28 R29 R30
U7, U14
LT1012ACS8
LT1468CS8
R18 R21
1K
OPT OPT
10K 10K 1K
0
4.02K 1K10
0
1K 10K 10K 1K
0
4.02K
0
10 1K
1uF
33pF
100pF 1uF 1uF
33pF
*
*
****
*
***
*
*
*
*
*
*
*
*
*
*
*
*
*
**
*
*
*
*
*
*
*
*
*
*
*
*
0
00
S0
0
1
1
1
0 10
-2.5 7.5
0 -5 5
1
-2.5 2.5
0
0
0
1
-10 10
0
0 5
0
1
S1S2
0
1
SPAN
FBB
FBA
OPT OPT OPT
OPT OPT
OPT OPT OPT OPT OPT OPT OPT OPT
OPT OPT
OPT
OPT
OPT OPT OPTOPT OPT OPT
OPT
OPT
OPT
VREFB
CS#
SCK
MOSI
MISO
VREFA
VOSADJA
VOSADJB
VREFB
CS#
SCK
MOSI
MISO
VREFA
VCC
V+
V-
V+
V-
+5V
-5V
V+
V-
+5V
-5V
V+
V-
+5V
-5V
-5V
+5V
VCC
VOSADJB
VOSADJA
VREFB
CS#
SCK
MOSI
MISO
VREFA
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
MARK T.PRODUCTION2 02-03-11
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
MARK T.PRODUCTION2 02-03-11
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
MARK T.PRODUCTION2 02-03-11
__
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
12
DUAL, SPI, IOUT, 18/16-BIT DAC
JW
MARK T.
N/A
LTC2758/2ACLX
DEMO CIRCUIT 1684A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
12
DUAL, SPI, IOUT, 18/16-BIT DAC
JW
MARK T.
N/A
LTC2758/2ACLX
DEMO CIRCUIT 1684A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
12
DUAL, SPI, IOUT, 18/16-BIT DAC
JW
MARK T.
N/A
LTC2758/2ACLX
DEMO CIRCUIT 1684A
R30R30
R17
10K R17
10K
C36
0.1uF
C36
0.1uF
U1U1
CS/LD
11
SCK
13
SDI
12
SRO
14
CLR
19
LDAC
26
RFLAG
20
S0
23
S1
24
S2
25
M-SPAN
22
GND
15
GND
7
GND
10
GND
17
GND
18
GND
27
GND
30
IOUT2BF
28
IOUT2BS
29
IOUT2AF
9
IOUT2AS
8
GEADJA
4
RINA
5
RINA
6
RCOMA
3
REFA
2
REFA
1
ROFSA
47
ROFSA
48
RFBA
46
RFBA
45
VOSADJA
43
IOUT1A
44
RFBB
39
RFBB
40
VOSADJB
42
IOUT1B
41
VDD
16
GEADJB
33
RINB
31
RINB
32
RCOMB
34
REFB
35
REFB
36
ROFSB
37
ROFSB
38
DNC
21
TP10TP10
TP8TP8
R7R7
R26R26
C22
100pF
C22
100pF
TP13TP13
TP15TP15
R27R27
JP4JP4
1
2
3
U11CU11C
V+
8
V-
4
V-
9
-
+V+
V-
U8
-
+V+
V-
U8
3
2
6
74
V-
-
+V+
U14
V-
-
+V+
U14
3
2
4 7
6
JP15JP15
R25R25
R21R21
R18R18
JP8JP8
1
2
3
JP6JP6
1
2
3
TP12TP12
R11
10K R11
10K
R23R23
-
+
U11A
-
+
U11A
2
3
1
C26
1206
C26
1206
JP12JP12
1
2
3
C35
1206
C35
1206
C28
1206
C28
1206
R10R10
R13
10K R13
10K
R6R6
R20R20
TP9TP9
TP14TP14 R29R29
V-
-
+V+
U13
V-
-
+V+
U13
3
4
2 5
1
C34
OPT
C34
OPT
C37
0.1uF
C37
0.1uF
R14
10K R14
10K
C41
0.1uF
C41
0.1uF
+
-
U11B
+
-
U11B
6
5
7
JP3JP3
1
2
3
V-
-
+V+
U9
V-
-
+V+
U9
3
4
2 5
1
R12
10K R12
10K
R24R24
R8R8
JP13JP13
1
2
3
C33
1206
C33
1206
C23
OPT. 1206
C23
OPT. 1206
R28R28
R19R19
JP1JP1
1
2
3
C40
0.1uF
C40
0.1uF
C25
1206
C25
1206
R15
10K R15
10K
JP5JP5
1
2
3
C29
OPT. 1206
C29
OPT. 1206
JP11JP11
1
2
3
C39
0.1uF
C39
0.1uF
C27
OPT
C27
OPT
JP16JP16
R16
10K R16
10K
-
+V+
V-
U12
-
+V+
V-
U12
3
2
6
74
C24
1206
C24
1206
TP11TP11
C32
1206
C32
1206
JP7JP7
1
2
3
R22R22
C38
0.1uF
C38
0.1uF
V-
-
+V+
U7
V-
-
+V+
U7
3
2
4 7
6
C30
1206
C30
1206
C31
100pF
C31
100pF
R9R9
JP9JP9
1
2
3
7
dc1684aabfb
DEMO MANUAL
DC1684A-A/DC1684A-B
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagrams
Figure 4. DC1684A Dual, SPI, IOUT, 18-/16-Bit DAC
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
VREFA
VCC
VREFA
5V
EXT
VCC
REF
REG
AMPV+
GND
AMPV-
2/3/2011
12V
VREFB
5V
EXT
VREFB
T1
T2
V+
V-
VCC
+5V
V+
+5V
-5V
VREFA
CS#
SCK
MOSI
MISO
VREFB
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
22
DUAL, SPI, IOUT, 18/16-BIT DAC
JW
MARK T.
N/A
LTC2758/2ACLX
DEMO CIRCUIT 1684A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
22
DUAL, SPI, IOUT, 18/16-BIT DAC
JW
MARK T.
N/A
LTC2758/2ACLX
DEMO CIRCUIT 1684A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
22
DUAL, SPI, IOUT, 18/16-BIT DAC
JW
MARK T.
N/A
LTC2758/2ACLX
DEMO CIRCUIT 1684A
C12
10uF
1206
C12
10uF
1206
U2
LTC6655CHMS8-5
U2
LTC6655CHMS8-5
VIN
2
SD#
1
GND
3
GND
4
GND
5
GND
8
OUTF
7
OUTS
6
C21
0.01uF
C21
0.01uF
U3
OPT.
U3
OPT.
GND
4
TRIM
5
VIN
2
VOUT
6
TP4TP4
C2
10uF
1206
C2
10uF
1206
R2
10.0K
R2
10.0K
C15
10uF
1206
C15
10uF
1206
R1
88.7K
R1
88.7K
C14
10uF
1206
C14
10uF
1206
C13
10uF
1206
C13
10uF
1206
TP1TP1
C1
10uF
1206
C1
10uF
1206
C11
10uF
1206
C11
10uF
1206
C6
10uF
1206
C6
10uF
1206
TP6TP6
C7
0.1uF
C7
0.1uF
C3
10uF
1206
C3
10uF
1206
D1
BAT54C
D1
BAT54C
3
1
2
U10
LT1761ES5-BYP
U10
LT1761ES5-BYP
GND
2
ADJ
4
BYP
3
IN
1
OUT
5
TP5TP5
SCKSCK
R34
10.0K
R34
10.0K
R31
10.0K
R31
10.0K
R4
4.99K
R4
4.99K
R32
10.0K
R32
10.0K
U6
LT1964ES5-5
U6
LT1964ES5-5
GND
1
SD
4
BYP
3
IN
2
OUT
5
C20
10uF
1206
C20
10uF
1206
J1
HD2X7-079-MOLEX
J1
HD2X7-079-MOLEX
MOSI/SDA
7
EESDA
9
V+
1
5V
2
CS
6
SCK/SCL
4
EEVCC
10
MISO
5
EESCL
11
EEGND
12
AUX
14
GND
3
GND
13
GND
8
R3
4.99K
R3
4.99K
JP14JP14
1
2
3
JP10JP10
1
2
3
MOSIMOSI
TP16TP16
R5
4.99K
R5
4.99K
TP2TP2
D2
BAT54C
D2
BAT54C
3
1
2
U5
LT1761ES5-5
U5
LT1761ES5-5
GND
2
SHDN
3
BYP
4
IN
1
OUT
5
CS#CS#
TP3TP3
C16
10uF
1206
C16
10uF
1206
MISOMISO
JP2JP2
1
2
3
C19
10uF
1206
C19
10uF
1206
C5
10uF
1206
C5
10uF
1206
C18
10uF
1206
C18
10uF
1206
C17
10uF
1206
C17
10uF
1206
D3
BAT54C
D3
BAT54C
3
1
2
U4
24LC025-I /ST
U4
24LC025-I /ST
A0
1
A1
2
A2
3
VSS
4
SDA
5
SCL
6
WP
7
VCC
8
R33
10.0K
R33
10.0K
TP7TP7
C4
0.1uF
C4
0.1uF
C10
0.01uF
C10
0.01uF
8
dc1684aabfb
DEMO MANUAL
DC1684A-A/DC1684A-B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2012
LT 0314 REV B • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
