Linear Technology DC1333A Guida rapida alla configurazione

DC1333afa

DEMO MANUAL DC1333A

DESCRIPTION

LTC2640

Single 12-Bit SPI VOUT DAC

with Internal Reference

Demonstration circuit 1333A features the LT C

2640, a

12-bit SPI DAC. This device establishes a new bench-

mark for size and integration of 12-bit DACs and onboard

reference.

The DC1333A may be connected directly to the target

application’s analog signals while using the DC590 USB

serial controller board and supplied software to measure

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.

BOARD PHOTO

performance. After evaluating with Linear Technology’s

software, the digital signals can be connected to the end

application’s processor

Design files for this circuit board are available at

http://www.linear.com/demo/DC1333A

Figure 1. DC1333A Connection Diagram

DAC

CONNECTIONS

RIBBON CABLE

TO DC590

CONTROLLER

dc1333a F01

DEMO BOARD VARIATIONS

DEMO BOARD TYPE LTC2640 VARIATION RESOLUTION (BITS) POWER-UP FULL-SCALE

DC1333A-A LTC2640AITS8-LM12 12 Mid-Scale 2.5V

DC1333A-B LTC2640AITS8-LZ12 12 Zero 2.5V

DC1333A-C LTC2640AITS8-HM12 12 Mid-Scale 4.096V

DC1333A-D LTC2640AITS8-HZ12 12 Zero 4.096V

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DC1333afa

DEMO MANUAL DC1333A

QUICK START PROCEDURE

1. ConnecttheDC1333AtoaDC590USBserialcontroller

using the supplied 14-conductor ribbon cable.

2. Connect the DC590 to the host PC with a standard

USB A/B cable.

3. Run the QuikEval™ evaluation software supplied

with the DC590 or download it from www.linear.

com/software. The correct program will be loaded

automatically.

Options are available to display the DAC output in voltage,

hex code, or decimal count. Additionally, the reference

voltage may be changed to reflect an actual measured

value, such that the output voltage matches the theoreti-

cal output voltage. The reference mode may be changed

from internal reference to external reference.

Features may be periodically added to the software. See

the software’s help menu for the latest information.

Figure 2. QuikEval Software

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DC1333afa

DEMO MANUAL DC1333A

HARDWARE SETUP

JUMPERS

_CLR/REF_SEL: On the B and D versions of the demo

board, this is not populated. On the A and C versions of the

demo board, this is used to determine the reference input.

ANALOG CONNECTIONS

DAC outputs are provided on the row of turret posts at

the edge of the board.

GROUNDING AND POWER CONNECTIONS

Power (VCC): Normally, the DC1334A is powered by the

DC590 controller. VCC can be supplied to the 5V turret,

howeverthe power supply on the DC590 must be disabled!

Refer to the DC590 Quick Start Guide for more details on

this mode of operation.

Grounding: Three ground posts are provided.

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DC1333afa

DEMO MANUAL DC1333A

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.

Figure 3. LTC2640 Schematic Diagram

SCHEMATIC DIAGRAM

D D

C C

B B

A A

HDR2X7-079-MOLEX

-C

LTC2640 - LZ12

LTC2640 - HM12

LTC2640 - HZ12

-A

LTC PART#

-B

LTC2640 - LM12

-D

Assy Table

_CLR/REF_SEL

R3JP1

4.99K

JP1

DC1333A-A/B/C/D

Tuesday, September 23, 2008

HELEN 9/12/07

Leo Chen 9/12/07

Single 12/10/8-Bit SPI Vout DAC

LTC2640-LM12/LZ12/HM12/HZ12

SIZE

SCALE:

CAGE CODE DWG NO REV

SHEET OF

FILENAME:

TITLE

CONTRACT NO.

APPROVALS DATE

DRAWN

CHECKED

APPROVED

ENGINEER

DESIGNER

TECHNOLOGY

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408)432-1900

Fax: (408)434-0507























E7 _CLR/REF_SEL

SDI

VUNREG

GND

SCK/SCL

MISO

MOSI/SDA

GND

EESDA

EEVCC

EESCL

EEGND

GND

JP1

4.99K

0.1uF

E3 GND

E1 VCC

LTC2640

_CS/LD

SDI

SCK

VOUT

GND REF

_CLR/REF_SEL

VCC

E2 REF

_CS/LD

OPT

0.1uF

E5 GND

SCK

Array

EEPROM

U2 24LC025-I/ST

SDA

SCL

GND

VCC

E4 VOUT

E6 GND

4.99K

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DC1333afa

DEMO MANUAL DC1333A

REVISION HISTORY

BOARD REV DATE DESCRIPTION PAGE NUMBER

A 04/16 Corrected Part #s

Removed BOM

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DC1333afa

DEMO MANUAL DC1333A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0416 REV A • 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

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