1
dc1534af
DEMO MANUAL DC1534A
ANALOG
OUTPUTS
TO DC590
DESCRIPTION
LTC2637: Octal 12-Bit DAC
with Internal Reference
Demonstration circuit DC1534A features the LTC2637 Octal
12-bit DAC. This device has an integrated, high accuracy,
low-drift reference. It has a rail-to-rail output buffer and is
guaranteed monotonic. This DAC communicates through
the simple I2C compatible interface.
Design fi les for this circuit board are available at www.
linear.com/demo.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DEMOBOARD ASSEMBLY LTC2637 VARIATION POWER UP
FULL-SCALE DAC OUTPUT
(Int. Reference Mode)
DC1534A-A LZ Zero-Scale 2.5V
DC1534A-B LMI Mid-Scale 2.5V
DC1534A-C HZ Zero-Scale 4.096V
DC1534A-D HMI Mid-Scale 4.096V
Figure 1.
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dc1534af
DEMO MANUAL DC1534A
QUICK START PROCEDURE
Connect DC1534A 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 DC590 or download it
from www.linear.com. The correct control panel will be
loaded automatically. Click the COLLECT button to begin
outputting codes to the DACs.
Complete software documentation is available from the
Help menu item, as features may be added periodically.
HARDWARE SET-UP
Analog Connections
DAC outputs – The eight DAC outputs from the LTC2637
are brought out to turrets labeled VOUTA through VOUTH.
These may be connected to external instruments or other
circuitry.
NOTE: DAC outputs are not in alphabetical order on the
circuit board.
VREF – The REF turret is connected directly to the reference
terminals of the LTC2637. When the integrated reference
is being used, the reference voltage may be monitored
at this point. An external reference may also be applied
to this turret after changing the setting in the QuickEval
software.
Grounding and Power Connections
Power (VCC) – Normally DC1534A is powered by the DC590
controller. VCC can be supplied to this turret, however
the power supply on DC590 must be disabled! Refer to
DC590 Quick Start Guide for more details on this mode
of operation.
Grounding – Ground turrets as well as 2 grounding strips
are provided.
Figure 2.
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dc1534af
DEMO MANUAL DC1534A
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 representation
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
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTES: UNLESS OTHERWISE SPECIFIED
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE IN OHMS, 0603.
LTC2637HMS - LMI12
LTC2637HMS - HMI12
ASSY
LTC2637IMS - LZ12-A
U1
LTC2637CMS - HZ12
*
-B
-C
-D
*
A
DC1534A - LTC2637
Tuesday, February 24, 2009 11
OCTAL 12-BIT I2C VOUT DAC
KIM T.
LEO C.
A
SCHEMATIC
WITH 10PPM/DEGREE C REFERENCE
SIZE
DATE:
DWG NO. REV
SHEET OF
TITLE:
CONTRACT NO.
APPROVALS
DRAWN:
CHECKED:
APPROVED:
ENGINEER:
DESIGNER:
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
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
VCC
VCC VCC VCC
U1
LTC2637
7
9
8
2
17
1
10
11
6
3
4
5
12
13
14
15
16
CA0
SDA
SCL
VOUTA
GND
VCC
CA1
REF
CA2
VOUTB
VOUTC
VOUTD
VOUTE
VOUTF
VOUTG
VOUTH
GND
E10
VG
JP3
CA2
1
0
1
3
2
R3
4.99k
E13
GND
E7 VD
E1
VCC
SDASCK
E12
GND
E2
GND
E11VH
R4
4.99k
J1
HD2X7-079-MOLEX
7
9
1
2
6
4
10
5
11
12
14
3
13
8
MOSI/SDA
EESDA
V+
5V
CS
SCK/SCL
EEVCC
MISO
EESCL
EEGND
AUX
GND
GND
GND
C4
0.1uF
E3
REF
U2
24LC025-I /ST
5
81
2
3
4
7
6
SDA
VCCA0
A1
A2
VSS
WP
SCL
E8
VE
E5
VB
C1
0.1uF
0402
JP1
CA0
1
0
1
3
2
R5
4.99k
JP2
CA1
1
0
1
3
2
E4 VA
C2
10uF
0805
E9 VF
C3
0.1uF
0402
E6
VC
4
dc1534af
DEMO MANUAL DC1534A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2009
LT 1109 • 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 direc-
tive 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
