Linear Technology DC1703A Guida rapida alla configurazione

dc1703af

DEMO MANUAL DC1703A

Description

LTC2655: Quad I2C

16-/12-Bit Rail-to-Rail DACs with

10ppm/°C Max Reference

Demonstration circuit 1703A features the LTC

2655 quad

16-/12-bit DAC. The LTC2655 is a family of 16-/12- bit

rail-to-rail DACs with integrated 10ppm/°C maximum

reference. The LTC2655 advances performance standards

for output drive, crosstalk and load regulation in single

supply, voltage-output multiple DACs.

Design files for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, µModule, 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.

Figure 1. Connection Diagram

Analog Outputs

To DC590

Table 1. LTC2655 Demo Board Variations

DEMO BOARD TYPE LTC2655 VARIATION FULL-SCALE VOLTAGE

DC1703A-A LTC2655CUF-L16 2.5V

DC1703A-B LTC2655CUF-H16 4.096V

DC1703A-C LTC2655CUF-L12 2.5V

DC1703A-D LTC2655CUF-H12 4.096V

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dc1703af

DEMO MANUAL DC1703A

quick start proceDure

Figure 2. Demo Board Setup

Connect the DC1703A to a DC590 USB serial controller

using the supplied 14 conductor ribbon cable. Connect

the DC590 to a host PC with a standard USB A/B cable.

Run the QuikEval™ evaluation software supplied with the

DC590 or download it from www.linear.com. The correct

control panel will be loaded automatically. In order to

update the DAC output value, fill in desired output code

inside the corresponding DAC box.

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dc1703af

DEMO MANUAL DC1703A

HarDware set-up

Jumpers

REF: VREF Select. This jumper selects which mode the

LTC2655 powers up in: external reference (EXT) or internal

reference (INT).

PORSEL: Power-Up Mode. The LTC2655 can be set to

either power-up in mid-scale or zero-scale.

CA2,CA1,CA0:Address SelectionJumpers.Thesejumpers

are used to select the I2C address of the DAC. Any changes

here should also be made in the QuikEval software.

Analog Connections

DAC Outputs: The 4 DAC outputs from the LTC2655 are

brought out to turrets labeled VOUTA through VOUTD. These

maybeconnected to external instruments or othercircuitry.

NOTE: DAC outputs are not in alphabetical order on the

circuit board.

VREF :The VREF turret is connected directly to the reference

terminals of the LTC2655. The on-chip reference may be

turned off, allowing the DAC reference pin to be driven

from this turret. Alternatively, when the on-chip reference

is on and active, the voltage can be monitored at this turret.

V+:Unregulated 10V is present here when a DC590 is

connected. This turret is provided for monitoring purposes

only and should not be connected to any other turrets on

the board.

Grounding and Power Connections

Power (VCC): Normally the DC1703A 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: There are 3 ground turrets provided (labeled

GND), as well as ground strips on the top and the bottom

of the board.

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dc1703af

DEMO MANUAL DC1703A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER, PART NUMBER

1 3 C1, C2, C3 Capacitor, X7R, 0.1µF 16V, 0402 TDK, C1005X7R1C104K

2 1 C4 Capacitor, X7R, 0.047µF 16V, 0402 TDK, C1005X7R1C473K

3 10 E1-E10 TP, Turret, 0.064" Mill-Max, 2308-2-00-80-00-00-07-0

4 5 JP1-JP5 Jumper, 3-Pin 1 Row 0.079CC Samtec, TMM-103-02-L-S

5 1 J1 Header, 2×7 Pin, 0.079CC Molex, 87831-1420

6 4 R1, R2, R3, R4 Resistor., Chip 4.99K 1/16W 1%,0402 NIC, NRC04F4991TRF

7 1 U2 IC, Serial EEPROM, TSSOP8 Microchip, 24LC025-I /ST

8 5 Shunts as Shown on

Assembly Drawing

Shunt, 0.079" Center Samtec, 2SN-BK-G

9 1 Stencil Top Side Only Stencil, 1703A

U1-A IC, LTC2655CUF-L16, 4mm ×4mm QFN20UF Linear Technology, LTC2655CUF-L16

U1-B IC, LTC2655CUF-H16, 4mm ×4mm QFN20UF Linear Technology, LTC2655CUF-H16

U1-C IC, LTC2655CUF-L12, 4mm ×4mm QFN20UF Linear Technology, LTC2655CUF-L12

U1-D IC, LTC2655CUF-H12, 4mm ×4mm QFN20UF Linear Technology, LTC2655CUF-H12

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dc1703af

DEMO MANUAL DC1703A

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

D D

C C

B B

A A

ALL CAPACITORS ARE IN MICROFARADS, 0402.

NOTES: UNLESS OTHERWISE SPECIFIED

2. INSTALL SHUNTS AS SHOWN.

1. ALL RESISTORS ARE IN OHMS, 0402.

ASSY U1

-A

-B

LTC2655CUF-L16

LTC2655CUF-H16

-C

-D LTC2655CUF-H12

LTC2655CUF-L12

-BIT

VCCV+

VCC

VCCVCCVCC

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 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

LTC2655CUF FAMILY

Thursday, November 11, 2010 1 1

QUAD 12/16-BIT RAIL-TO-RAIL I2C DAC

LEO C.

N/A

DEMO CIRCUIT 1703A

WITH 10ppm/ C MAX REFERENCE

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 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

LTC2655CUF FAMILY

Thursday, November 11, 2010 1 1

QUAD 12/16-BIT RAIL-TO-RAIL I2C DAC

LEO C.

N/A

DEMO CIRCUIT 1703A

WITH 10ppm/ C MAX REFERENCE

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 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

LTC2655CUF FAMILY

Thursday, November 11, 2010 1 1

QUAD 12/16-BIT RAIL-TO-RAIL I2C DAC

LEO C.

N/A

DEMO CIRCUIT 1703A

WITH 10ppm/ C MAX REFERENCE

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

2ND PROTOTYPE

211-11-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

2ND PROTOTYPE

211-11-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

2ND PROTOTYPE

211-11-10

JP3

GND

VCC

CA0

JP3

GND

VCC

CA0

JP4

GND

VCC

CA1

JP4

GND

VCC

CA1

0.1uF

E8 VOUTC

E4 GND

E7 VOUTB

HD2X7-079-MOLEX

MOSI/SDA 7

EESDA 9

V+ 1

5V 2

CS 6

SCK/SCL 4

EEVCC 10

MISO 5

EESCL 11

EEGND 12

AUX 14

GND

JP5

GND

VCC

CA2

JP5

GND

VCC

CA2

SCL

DNC

REFCOMP 2

VOUTB 3

REFIN/OUT 4

LDAC 5

VOUTA 1

SDA

CA1

10 CA0

PORSEL

VOUTC 13

VOUTD 14

REFLO

GND

VCC 18

DNC 17

DNC 16

DNC

GND

E6 VOUTA

0.047uF

E5 GND

VCC

SDASDA

4.99K

JP1

EXT

INT

REF

JP1

EXT

INT

REF 1

24LC025-I /ST

SDA 5

VCC 8

VSS

WP 7

SCL 6

LDACLDAC

0.1uF

E9 VOUTD

VREF

JP2

PORSEL

JP2

PORSEL

SCLSCL

0.1uF

4.99K

GND

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dc1703af

DEMO MANUAL DC1703A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2011

LT 0511 • 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

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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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