Page 1
DEMO MANUAL DC1466B
LTC2636
Octal 12-Bit SPI V
10ppm/°C Internal Reference
Description
Demonstration circuit 1466B features the LTC®2636 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 SPI compatible interface.
OUT
Design files for this circuit board are available at
http://www.linear.com/demo/DC1466B
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.
DACs with
Analog
To DC590
Figure 1
Table 1.
DEMO BOARD TYPE LTC2636 VARIATION (SUFFIX) POWER-UP OUTPUT FULL-SCALE OUTPUT VOLTAGE
A LZ Zero 2.5V
B LMI Mid-Scale 2.5V
C HZ Zero 4.096V
D HMI Mid-Scale 4.096V
Outputs
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Page 2
DEMO MANUAL DC1466B
Quick start proceDure
Connect DC1466B 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
QuikEval™ evaluation software supplied with DC590 or
download it from www.linear.com/software. The correct
control panel will be loaded automatically. The DAC is
updated as changes are made to the GUI screen. Entering
a voltage into a text box will cause the DAC's output to
update immediately. Values may be entered in voltage,
hexadecimal counts, or decimal counts by selecting the
appropriate radio button. The reference mode may also
be changed, and individual DACs can be powered down
by unchecking the "Enable" box.
Complete software documentation is available from the
Help menu item, as features may be added periodically.
2
Figure 2
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HarDware setup
DEMO MANUAL DC1466B
Analog Connections
DAC Outputs – The eight DAC outputs from the LTC2636
are brought out to turrets labeled VOUTA through VOUTH.
These may be connected to external instruments or other
circuitry.
DAC outputs are not in alphabetical order on the circuit
board.
REF – The REF turret is connected directly to the reference
pin of the LTC2636. When the integrated reference is be
ing 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 evaluation software.
-
Digital Connections
LDAC – Load pin, active low, pulled to V
Updates the DAC register from the Input register. Do not
assert this pin when using with the evaluation software.
This pin can be used to update all DACs simultaneously,
after individual input registers have been written to.
CLR – Clear pin, active low, pulled to V
tor. Asserting
power-up value.
Grounding and Power Connections
Power (V
controller. V
the power supply on DC590 must be disabled! Refer to
DC590
of operation.
Grounding – Ground turrets as well as 2 grounding strips
are provided.
Quick Start Guide for more details on this mode
this pin clears all DACs to their default
) – Normally DC1466 is powered by the DC590
CC
can be supplied to this turret, however
CC
by a 10k resistor.
CC
by a 10k resis-
CC
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3
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DEMO MANUAL DC1466B
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Parts List – All Assembly Types
1 2 C1, C3 CAP., X5R, 0.1µF, 16V, 10%, 0402 AVX, 0402YD104K AT
2 1 C4 CAP., X7R, 0.1µF, 16V, 10%, 0603 AVX, 0603YC104KAT
3 1 C2 CAP., X5R, 10µF, 16V, 10%, 0805 AVX, 0805YD106K AT
4 13 E1–E13 TESTPOINT, TURRET, 0.065" MILL-MAX, 2308-2-00-80-00-00-07-0
5 1 J1
6 2 R1, R2 RES., CHIP, 4.99k, 1/16W, 1%, 0603 VISHAY, CRCW06034K99FKEA
7 2 R3, R4 RES., CHIP, 10k, 1/16W, 1%, 0603 VISHAY, CRCW06010K0FKEA
8 1 U2 IC, EEPROM 2k BIT 400kHz 8 TSSOP MICROCHIP, 24LC025-I/ST
Parts List – DC1466B-A
2 1 U1 LTC2636CMS-LZ12#PBF, MSOP 16-PIN LINEAR TECH., LTC2636CMS-LZ12#PBF
Parts List – DC1466B-B
2 1 U1 LTC2636CMS-LMI12#PBF, MSOP 16-PIN LINEAR TECH., LTC2636CMS-LMI12#PBF
Parts List – DC1466B-C
2 1 U1 LTC2636CMS-HZ12#PBF, MSOP 16-PIN LINEAR TECH., LTC2636CMS-HZ12#PBF
Parts List – DC1466B-D
2 1 U1 LTC2636CMS-HMI12#PBF, MSOP 16-PIN LINEAR TECH., LTC2636CMS-HMI12#PBF
HEADER, 2×7 PIN, 0.079CC
MOLEX, 87831-1420
BoarD revision History
BOARD REV DATE DESCRIPTION
A
B 10/13
Original Design
Connected Floating Address Lines on ID EEPROM.
4
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DEMO MANUAL DC1466B
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
HDR2X7-079-MOLEX
*
U1
-A
LTC2636CMS - HZ12
LTC2636CMS - LMI12-B
-C*-D
LTC2636CMS - LZ12
LTC PART#
Assy Table
LTC2636CMS - HMI12
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 PROPE R AND RELIABLE OPERATION I N THE ACTUAL
APPLICATION. COMP ONENT SUBSTITUTION AND P RINTED
CIRCUIT BOARD LAYOUT MAY S IGNIFICANTLY AFFE CT CIRCUIT
PERFORMANCE OR RELIABI LITY. CONTACT LINE AR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR T ECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Wednesday, September 04, 2013
1 11
12-BIT, OCTAL SPI DAC WITH INTERNAL REFERENCE
HZ
Leo C.
N/A
LTC2636 FAMILY
DEMO CIRCUIT 1466B
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 PROPE R AND RELIABLE OPERATION I N THE ACTUAL
APPLICATION. COMP ONENT SUBSTITUTION AND P RINTED
CIRCUIT BOARD LAYOUT MAY S IGNIFICANTLY AFFE CT CIRCUIT
PERFORMANCE OR RELIABI LITY. CONTACT LINE AR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR T ECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Wednesday, September 04, 2013
1 11
12-BIT, OCTAL SPI DAC WITH INTERNAL REFERENCE
HZ
Leo C.
N/A
LTC2636 FAMILY
DEMO CIRCUIT 1466B
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 PROPE R AND RELIABLE OPERATION I N THE ACTUAL
APPLICATION. COMP ONENT SUBSTITUTION AND P RINTED
CIRCUIT BOARD LAYOUT MAY S IGNIFICANTLY AFFE CT CIRCUIT
PERFORMANCE OR RELIABI LITY. CONTACT LINE AR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR T ECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Wednesday, September 04, 2013
1 11
12-BIT, OCTAL SPI DAC WITH INTERNAL REFERENCE
HZ
Leo C.
N/A
LTC2636 FAMILY
DEMO CIRCUIT 1466B
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
Leo C.
PRODUCTION1 10-10- 12
1
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
Leo C.
PRODUCTION1 10-10- 12
1
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
Leo C.
PRODUCTION1 10-10- 12
1
C4
0.1uFC40.1uF
C3 0.1uFC3 0.1uF
J1J1
VUNREG
1
5V
2
GND
3
SCK/SCL
4
MISO
5
CS
6
MOSI/SDA
7
GND
8
EESDA
9
EEVCC
10
EESCL
11
EEGND
12
GND
13
NC
14
E10
VOUTG
E10
VOUTG
R2
4.99KR24.99K
Array
EEPROM
U2
24LC025-I/ST
Array
EEPROM
U2
24LC025-I/ST
SDA5SCL
6
WP
7
GND
4
VCC
8
A23A12A0
1
E7
VOUTDE7VOUTD
E1
VCCE1VCC
R4
10KR410K
E2
GNDE2GND
E11
VOUTH
E11
VOUTH
R3
10KR310K
U1
LTC2636-U1LTC2636-
SDI9SCK
8
CS/LD
7
VOUTA
2
GND
17
REF
11
CLR
10
VCC
1
LDAC
6
VOUTB
3
VOUTC4VOUTD
5
VOUTE
12
VOUTF
13
VOUTG
14
VOUTH
15
GND
16
E3
REFE3REF
E13
LDAC
E13
LDAC
E12
CLR
E12
CLR
E8
VOUTEE8VOUTE
E5
VOUTBE5VOUTB
R1
4.99KR14.99K
SCKSCK
C1
0.1uFC10.1uF
SDISDI
CS/LDCS/LD
E4
VOUTAE4VOUTA
C2
10uFC210uF
E9
VOUTFE9VOUTF
E6
VOUTCE6VOUTC
scHematic Diagram
dc1466bf
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.
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DEMO MANUAL DC1466B
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 LT C 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.
LT C 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 LT C application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
Linear Technology Corporation
6
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
dc1466bf
LT 0913 • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2013
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