Linear Technology LTC2636 Quick setup guide

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dc1466bf
DEMO MANUAL DC1466B
Description
LTC2636
Octal 12-Bit SPI VOUT DACs with
10ppm/°C Internal Reference
Demonstration circuit 1466B features the LT C
®
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.
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.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1466B
Figure 1
To DC590
Analog
Outputs
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

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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.
Figure 2

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dc1466bf
DEMO MANUAL DC1466B
HarDware setup
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 – Loadpin,activelow,pulledtoVCC bya10kresistor.
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 VCC by a 10k resis-
tor. Asserting this pin clears all DACs to their default
power-up value.
Grounding and Power Connections
Power (VCC)–Normally DC1466 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.

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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, 0402YD104KAT
2 1 C4 CAP., X7R, 0.1µF, 16V, 10%, 0603 AVX, 0603YC104KAT
3 1 C2 CAP., X5R, 10µF, 16V, 10%, 0805 AVX, 0805YD106KAT
4 13 E1–E13 TESTPOINT, TURRET, 0.065" MILL-MAX, 2308-2-00-80-00-00-07-0
5 1 J1 HEADER, 2×7 PIN, 0.079CC MOLEX, 87831-1420
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
BoarD revision History
BOARD REV DATE DESCRIPTION
A
B 10/13
Original Design
Connected Floating Address Lines on ID EEPROM.

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DEMO MANUAL DC1466B
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
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: [phone] Milpitas, CA 95035 Phone: [phone] 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
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: [phone] Milpitas, CA 95035 Phone: [phone] 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
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: [phone] Milpitas, CA 95035 Phone: [phone] 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
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.
PRODUCTION110-10-12
1
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
Leo C.
PRODUCTION110-10-12
1
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
Leo C.
PRODUCTION110-10-12
1
C4
0.1uF
C4
0.1uF
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
4.99K
R2
4.99K
Array
EEPROM
U2 24LC025-I/ST
Array
EEPROM
U2 24LC025-I/ST
SDA
5SCL 6
WP 7
GND
4
VCC
8
A2 3 A1 2 A0 1
E7 VOUTD E7 VOUTD E1 VCC E1 VCC
R4 10K R4 10K
E2 GND E2 GND E11 VOUTH E11 VOUTH
R3
10K
R3
10K
U1
LTC2636-
U1
LTC2636-
SDI
9
SCK
8
CS/LD
7
VOUTA 2
GND
17
REF 11
CLR
10
VCC 1
LDAC
6
VOUTB 3
VOUTC 4 VOUTD 5
VOUTE 12
VOUTF 13
VOUTG 14
VOUTH 15
GND
16
E3 REF E3 REF E13 LDAC E13 LDAC E12 CLR E12 CLR E8 VOUTE E8 VOUTE E5 VOUTB E5 VOUTB
R1
4.99K
R1
4.99K
SCKSCK
C1
0.1uF
C1
0.1uF
SDISDI
CS/LDCS/LD
E4 VOUTA E4 VOUTA
C2
10uF
C2
10uF
E9 VOUTF E9 VOUTF E6 VOUTC E6 VOUTC

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DEMO MANUAL DC1466B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
LT 0913 • PRINTED IN USA
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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation