DC1466B - Demo Manual

DEMO MANUAL DC1466B
LTC2636
Octal 12-Bit SPI VOUT DACs with
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.
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.
Analog
Outputs
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
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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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DEMO MANUAL DC1466B
Hardware Setup
Analog Connections
Digital 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.
LDAC – Load pin, active low, pulled to VCC by a 10k resistor.
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.
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 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 evaluation software.
CLR – Clear pin, active low, pulled to VCC by a 10k resistor. 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
1
U1
LTC2636CMS-LZ12#PBF, MSOP 16-PIN
LINEAR TECH., LTC2636CMS-LZ12#PBF
1
U1
LTC2636CMS-LMI12#PBF, MSOP 16-PIN
LINEAR TECH., LTC2636CMS-LMI12#PBF
1
U1
LTC2636CMS-HZ12#PBF, MSOP 16-PIN
LINEAR TECH., LTC2636CMS-HZ12#PBF
1
U1
LTC2636CMS-HMI12#PBF, MSOP 16-PIN
LINEAR TECH., LTC2636CMS-HMI12#PBF
Parts List – DC1466B-A
2
Parts List – DC1466B-B
2
Parts List – DC1466B-C
2
Parts List – DC1466B-D
2
Board Revision History
BOARD REV
DATE
A
B
4
DESCRIPTION
Original Design
10/13
Connected Floating Address Lines on ID EEPROM.
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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.
A
B
C
J1
5
NC
EESCL
EESDA
EEGND
EEVCC
MISO
MOSI/SDA
SCK/SCL
CS
5V
VUNREG
14
11
9
12
10
5
7
4
6
2
1
HDR2X7-079-MOLEX
C4
0.1uF
SCK
8
LTC2636CMS - HZ12
LTC2636CMS - HMI12
-C
-D
4
LTC2636CMS - LMI12
LTC2636CMS - LZ12
-B
-A
GND
SDA
SCL
VCC
A0
A1
A2
WP
U2 24LC025-I/ST
LTC PART#
4
5
6
R1
R2
4.99K 4.99K
SDI
U1
* Assy Table
CS/LD
1
2
3
7
*
6
10
9
8
7
LDAC
CLR
SDI
SCK
CS/LD
CUSTOMER NOTICE
R4
10K
U1
LTC2636-
C3
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
HZ
2
SCALE = NONE
Leo C.
15
14
13
C2
10uF
DATE:
N/A
SIZE
E1
1
Leo C.
APPROVED
DATE
10-10-12
1
LTC2636 FAMILY
DEMO CIRCUIT 1466B
Wednesday, September 04, 2013
IC NO.
SHEET 1
OF 11
1
REV.
12-BIT, OCTAL SPI DAC WITH INTERNAL REFERENCE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
LDAC
CLR
VOUTH
VOUTG
VOUTF
VOUTE
VOUTD
VOUTC
VOUTB
VOUTA
REF
GND
TECHNOLOGY
E13
E12
E11
E10
E9
E8
E7
E6
E5
E4
E3
E2
PRODUCTION
1
1
VCC
DESCRIPTION
REVISION HISTORY
REV
ECO
TITLE: SCHEMATIC
C1
0.1uF
12
5
4
3
2
APPROVALS
VOUTH
VOUTG
VOUTF
VOUTE
VOUTD
VOUTC
VOUTB
VOUTA
0.1uF
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
R3
10K
3
REF
D
GND
13
GND
8
GND
3
4
Array
EEPROM
1
VCC
GND
16
11
GND
17
5
A
B
C
D
DEMO MANUAL DC1466B
Schematic Diagram
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DEMO MANUAL DC1466B
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 application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
6
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Linear Technology Corporation
LT 0913 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
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