1
dc1096bfa
DEMO MANUAL DC1096B
DESCRIPTION
LTC2642A-16
16-Bit Unbuffered VOUT DAC
Demonstration circuit 1096B features the LTC
®
2642A-16,
a 16-bit voltage output DAC. The LTC2642A-16 output is
unbuffered, allowing it to swing all the way to the supply rails.
DC1096B is a member of Linear Technology’s QuikEval™
family of demonstration boards. It is designed to allow
easy evaluation of the LTC2642A-16 and may be connected
directly to the target application’s analog signals while
using the DC590 USB serial controller board and supplied
software to measure performance. The exposed ground
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
planes allow proper grounding to prototype circuitry.
After evaluating with Linear Technology’s software, the
digital signals can be connected to the end application’s
processor/controller for development of the serial interface.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1096
Figure 1. Connection Diagram
DAC1 OUTPUT–
LTC6078 BUFFER
DAC2 OUTPUT–
LT1678 AMP
DAC3 OUTPUT–
OPTIONAL AMP
DAC3 UNBUFFERED
OUTPUT
REFERENCE
VOLTAGE
DC1096b F01
AMPLIFIER
SUPPLY
+ – + –
2
dc1096bfa
DEMO MANUAL DC1096B
QUICK START PROCEDURE
Connect DC1096B to a DC590 USB serial controller using
the supplied 14-conductor ribbon cable. Connect DC590
to host PC with a standard USB A/B cable. Run the evalu-
ation software supplied with DC590 or downloaded from
www.linear.com/software. The correct program will be
loaded automatically. By default, the control program will
load a DC value into the LTC2642A-16. The value may be
changed by typing hexadecimal counts (0000 - FFFF),
or decimal counts (0 – 65535), or the voltage desired
depending on the option selected. Setting the software
to unipolar or bipolar will not set the hardware to bipolar
mode. The jumpers need to be placed in their proper
positions in order to accomplish this.
The other option is a square wave output. The frequency
of the square wave is not tightly controlled; it is intended
to allow measurement of settling time and glitch impulse.
Features may be periodically added to the software, see
the software’s help menu for the latest information.
3
dc1096bfa
DEMO MANUAL DC1096B
HARDWARE SETUP
POWER CONNECTIONS
A low noise, bipolar power supply can be connected to
the AMPV+, AMPV–, and GND turret posts.
If an external supply is connected, the respective jumpers
must be placed in the EXT position.
This provides power to the LT1678 amplifier and optional
amplifiers U5, U8, or U9. The LT1678 will work with sup-
plies as high as ±15V, consult the data sheet for supply
limitations on any optional amplifiers that are installed.
JUMPERS
JP1: Select the source for REF+, either 2.5V or 5V from
the onboard LT1019 or LT1236 reference (default – 5V)
JP2: Select the VCC source, either provided by a connected
DC590 or an external source.
JP3: Sets DAC2 to either unipolar or bipolar mode. In bipolar
mode, set JP6 and JP7 to EXT and apply an appropriate
supply to AMP V+, AMP V–, and GND turret posts.
JP4: Sets DAC3 to either unipolar or bipolar mode. In bipolar
mode, set JP6 and JP7 to EXT and apply an appropriate
supply to AMP V+, AMP V–, and GND turret posts.
JP6: Sets V+ for the amplifiers to either external (AMP V+)
or VCC.
JP7: Sets V– for the amplifiers to either external (AMP V–)
or ground.
CONNECTION TO DC590 SERIAL CONTROLLER
J1 is the power and digital interface connector. Connect
to DC590 serial controller with supplied 14-conductor
ribbon cable.
OUTPUT CONNECTIONS
E3 is the output from U1, which is buffered by an LTC6078
op amp.
E4 is the output from U2, which is buffered by an LT1678
op amp. JP3 allows this DAC to be configured for either
unipolar or bipolar operation.
E5 is the buffered output of U4, if an optional amplifier is
installed. There are three standard op amp footprints that
allow other amplifiers to be evaluated.
E10 is directly connected to U4’s output.
REFERENCE CONNECTIONS
JP1 selects between the onboard 5V reference and the
onboard 2.5V reference. The reference voltage can be
monitored on E9, or an external reference may be applied
to E9 if JP1 is removed.
4
dc1096bfa
DEMO MANUAL DC1096B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 12 C1, C3, C6, C13-C21 CAP, 0603 0.1µF 10% 25V X7R AVX 06033C104KAT
2 2 C4, C5 CAP, 0805 10µF 20% 10V X5R TDK C2012X5R1A106M125AB
3 1 C8 CAP, 0402 0.1µF 20% 16V X7R TDK C1005X7R1C104M050BC
4 2 C10, C9 CAP, 0603 4.7µF 20% 6.3V X5R TDK C1608X5R0J475M080AB
5 1 C11 CAP, 0402 33pF 10% 50V NP0 AVX, 04025A330KAT2A
6 0 C12 CAP, 0402 OPTION TDK C1005X7R1E103K050BB
7 13 E1-E10, E12-E14 TURRET MILL-MAX 2308-2-00-80-00-00-07-0
8 6 JP1-JP4, JP6, JP7 HEADER, 3PIN 2mm SULLINS, NRPN031PAEN-RC
9 1 JP5 HEADER, 2X4 0.100 CENTERS WÜRTH ELEKTRONIK, 61300821121
10 1 J1 HEADER, 2X7 2mm MOLEX 87831-1420
11 1 R1 RES, 0402 10k 5% 1/16W VISHAY CRCW040210K0JNED
12 2 R3, R2 RES, 0402 0Ω JUMPER VISHAY CRCW04020000Z0ED
13 3 R4, R5, R6 RES, 0402 4.99k 1% 1/16W VISHAY CRCW04024K99FKED
14 3 R7, R8, R9 RES, 0603 0Ω JUMPER VISHAY CRCW0603000Z0EA
15 3 U1, U2, U4 IC, LTC2642ACDD-16 LINEAR TECH. LTC2642ACDD-16
16 1 U3 IC, 24LC025-I/ST MICROCHIP TECH. 24LC025-I/ST
17 0 U5, U8, U9 IC, OPTION OPTION
18 1 U6 IC, LTC6078ACMS8 LINEAR TECH LTC6078ACMS8
19 1 U7 IC, LT1678CS8#PBF LINEAR TECH LT1678CS8#PBF
20 1 U10 IC, VOLTAGE REG 5V LINEAR TECH. LT1236CCS8-5#PBF
21 1 U11 IC, VOLTAGE REG 2.5V LINEAR TECH. LT1019CS8-2.5#PBF
22 6 JP1-JP4, JP6, JP7 SHUNT SAMTEC 2SN-BK-G
23 1 JP5 SHUNT, 0.100 WÜRTH ELEKTRONIK, 60900213421
PARTS LIST
5
dc1096bfa
DEMO MANUAL DC1096B
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 DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
VREF
VCC
SPI BUS
11
1111
VREF
VREF
VREF
VREF
VDD
VDD
VDD
VDD
V-
V+
V-
V+
V-
V+
V-
V+
V-
V+
V-
V+
V-
V+
VDD
V+
V-
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
MARK T.REBUILD WITH CHANGE
__
1 01-09-15
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
MARK T.REBUILD WITH CHANGE
__
1 01-09-15
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
MARK T.REBUILD WITH CHANGE
__
1 01-09-15
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
1
DEMO CIRCUIT 1096B
Friday, January 09, 2015
11
16-BIT VOUT DAC
N/A
LTC2642ACDD-16
KIM T.
MARK T.
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
1
DEMO CIRCUIT 1096B
Friday, January 09, 2015
11
16-BIT VOUT DAC
N/A
LTC2642ACDD-16
KIM T.
MARK T.
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
1
DEMO CIRCUIT 1096B
Friday, January 09, 2015
11
16-BIT VOUT DAC
N/A
LTC2642ACDD-16
KIM T.
MARK T.
U3
24LC025-I/ST
U3
24LC025-I/ST
A0 1
A1 2
A2 3
GND
4
SDA
5
SCL 6
WP 7
VCC 8
E13
GND E13
GND
R7 0R7 0
U10 LT1236CCS8-5U10 LT1236CCS8-5
IN
2
GND
4
TRIM 5
OUT 6
R5
4.99K
1%
R5
4.99K
1%
C11
33pF
50V
C11
33pF
50V
C14
0.1uF
C14
0.1uF
R4
4.99K
1%
R4
4.99K
1%
JP6
VCC
EXT JP6
VCC
EXT
1
2
3
R3 0R3 0
C12
OPT
C12
OPT
E8
GND E8
GND
SCK
SDI
LD
NCLR
GND
RFB
VDD
REF
VOUT
INV
U1
LTC2642ACDD-16
SCK
SDI
LD
NCLR
GND
RFB
VDD
REF
VOUT
INV
U1
LTC2642ACDD-16
9
6
4
3
2
5
8
10
1
7
JP1
5V
2.5V
JP1
5V
2.5V
1
2
3
E9 VREF
E9 VREF
C18
0.1uF
C18
0.1uF
SCK
SDI
LD
NCLR
GND
RFB
VDD
REF
VOUT
INV
U2
LTC2642ACDD-16
SCK
SDI
LD
NCLR
GND
RFB
VDD
REF
VOUT
INV
U2
LTC2642ACDD-16
9
6
4
3
2
5
8
10
1
7
JP5JP5
1 2
3 4
5 6
7 8
E5 DAC3 BUF
E5 DAC3 BUF
E1
VDD
E1
VDD
+
-
U8B
OPT S08
+
-
U8B
OPT S08
7
6
5
4 8
C4
10uF
C4
10uF
E14
AMP V- E14
AMP V-
-
+
U7A
LT1678CS8
-
+
U7A
LT1678CS8
3
2
1
84
JP3
BIP
UNI JP3
BIP
UNI
1
2
3
R8 0R8 0
C10
4.7uF
C10
4.7uF
C21
0.1uF
C21
0.1uF
+
-
U5B
OPT S8
+
-
U5B
OPT S8
7
6
5
4 8
SCK
SDI
LD
NCLR
GND
RFB
VDD
REF
VOUT
INV
U4
LTC2642ACDD-16
SCK
SDI
LD
NCLR
GND
RFB
VDD
REF
VOUT
INV
U4
LTC2642ACDD-16
9
6
4
3
2
5
8
10
1
7
E2 GND
E2 GND
C6
0.1uF
C6
0.1uF
C9
4.7uF
C9
4.7uF
C19
0.1uF
C19
0.1uF
E7
V+ E7
V+
C16
0.1uF
C16
0.1uF
JP2
INT EXT
JP2
INT EXT
1
2
3
-
+
U9
OPT SOT23-5
-
+
U9
OPT SOT23-5
3
4
2 5
1
J1J1
5V 2
SCK/SCL 4
CS 6
GND
8
EEVCC 10
EEGND 12
NC 14
VUNREG 1
GND
3
MISO 5
MOSI/SDA 7
EESDA 9
EESCL 11
GND
13
R6
4.99K
1%
R6
4.99K
1%
C8
0.1uF
C8
0.1uF
R1
10K
R1
10K
JP4
BIP
UNI
JP4
BIP
UNI
1
2
3
C1
0.1uF
C1
0.1uF
-
+
U6A
LTC6078ACMS8
-
+
U6A
LTC6078ACMS8
3
2
1
84
-
+
U5A
OPT S8
-
+
U5A
OPT S8
1
2
3
4 8
E10 DAC3 DIRECT
E10 DAC3 DIRECT
R9 0R9 0
R2
0
R2
0
E4 DAC2
E4 DAC2
C15
0.1uF
C15
0.1uF
JP7
EXT
GND
JP7
EXT
GND
1
2
3
U11 LT1019CS8-2.5U11 LT1019CS8-2.5
IN
2
GND
4
TRIM 5
OUT 6
C13
0.1uF
C13
0.1uF
E12
AMP V+ E12
AMP V+
C5
10uF
C5
10uF
C20
0.1uF
C20
0.1uF
C17
0.1uF
C17
0.1uF
E3
DAC1
E3
DAC1
-
+
U6B
LTC6078ACMS8
-
+
U6B
LTC6078ACMS8
5
6
7
84
-
+
U7B
LT1678CS8
-
+
U7B
LT1678CS8
5
6
7
84
C3
0.1uF
C3
0.1uF
-
+
U8A
OPT S08
-
+
U8A
OPT S08
1
2
3
4 8
E6
GND
E6
GND
6
dc1096bfa
DEMO MANUAL DC1096B
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 0215 REV A • 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 LT C 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. LT C 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
