Linear Technology DC1678A Guida rapida alla configurazione

dc1678af

DEMO MANUAL DC1678A

TO DC590

ANALOG

OUTPUTS

DESCRIPTION

LTC2654:

Quad 16-Bit/12-Bit Rail-To-Rail SPI DACs

with 10ppm/°C Max Reference

Demonstration circuit 1678A features the LTC2654 Quad

16-bit/12-bit DAC. The LTC2654 is a family of 16-bit/12-bit

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

reference. The LTC2654 advances performance standards

L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective owners.

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

Figure 1. Connection Diagram

Table 1. LTC2654 Demo board variations

DEMO BOARD TYPE LTC2654 VARIATION FULL-SCALE VOLTAGE

DC1678A-A LTC2654CUF-L16 2.5V

DC1678A-B LTC2654CUF-H16 4.096V

DC1678A-C LTC2654CUF-L12 2.5V

DC1678A-D LTC2654CUF-H12 4.096V

dc1678af

DEMO MANUAL DC1678A

QUICK START PROCEDURE

Figure 1. Demo Board Setup

Connect the DC1678A 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. To update DAC value,

fill in corresponding text box.

dc1678af

DEMO MANUAL DC1678A

QUICK START PROCEDURE

HARDWARE SET-UP

Jumpers

REF – VREF Select. This jumper selects which mode the

LTC2654 powers up in: External reference (EXT) or Internal

reference (INT).

PORSEL – Power Up Mode. The LTC2654 can be set to

either power up in Mid Scale or Zero Scale.

Analog Connections

DAC outputs – The 4 DAC outputs from the LTC2654 are

brought out to turrets labeled VOUTA through VOUTD.

These may be connected to external instruments or other

circuitry.

NOTE: DAC outputs are not in alphabetical order on the

circuit board.

VREF – The VREF turret is connected directly to the refer-

ence terminals of the LTC2654. 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 DC1678A 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.

dc1678af

DEMO MANUAL DC1678A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

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 2 JP1,JP2 Jumper, 3-Pin 1 Row 0.079CC Samtec, TMM-103-02-L-S

5 1 J1 Header, 2X7 Pin, 0.079CC Molex, 87831-1420

6 5 R1,R2,R3,R4,R5 Resistor, Chip 4.99k 1/16W 1%, 0402 NIC, NRC04F4991TRF

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

8 2 Shunts as Shown

on Assy Dwg

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

U1-A IC, LTC2654CUF-L16, QFN20UF 4mm ×4mm Linear Technology, LTC2654CUF-L16

U1-B IC, LTC2654CUF-H16, QFN20UF 4mm ×4mm Linear Technology, LTC2654CUF-H16

U1-C IC, LTC2654CUF-L12, QFN20UF 4mm ×4mm Linear Technology, LTC2654CUF-L12

U1-D IC, LTC2654CUF-H12, QFN20UF 4mm ×4mm Linear Technology, LTC2654CUF-H12

dc1678af

DEMO MANUAL DC1678A

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

LTC2654CUF-L16

LTC2654CUF-H16

-C

-D

LTC2654CUF-L12

LTC2654CUF-H12

-BIT

VCCV+

VCC

VCC VCC

VCC

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

LTC2654CUF FAMILY

Wednesday, August 11, 2010 1 1

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

LEO C.

N/A

DEMO CIRCUIT 1678A

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

LTC2654CUF FAMILY

Wednesday, August 11, 2010 1 1

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

LEO C.

N/A

DEMO CIRCUIT 1678A

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

LTC2654CUF FAMILY

Wednesday, August 11, 2010 1 1

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

LEO C.

N/A

DEMO CIRCUIT 1678A

WITH 10ppm/ C MAX REFERENCE

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

PRODUCTION

208-11-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

PRODUCTION

208-11-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

PRODUCTION

208-11-10

V+

SCK

DNC

REFCOMP 2

VOUTB 3

REFIN/OUT 4

LDAC 5

VOUTA 1

SDI

SDO

CLR 11

PORSEL 12

VOUTC 13

VOUTD 14

REFLO

GND

VCC 18

DNC

GND

E8 VOUTC

0.1uF

SDISDI

E7 VOUTB

E10 GND

0.1uF

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

4.99K

E6 VOUTA

JP2

PORSEL

JP2

PORSEL1

E5 GND

CLKCLK

VCC

VCC R1

4.99K

0.047uF

CLRCLR

4.99K

LDACLDAC

JP1

EXT

INT

REF

JP1

EXT

INT

REF 1

4.99K

24LC025-I /ST

SDA 5

VCC 8

VSS

WP 7

SCL 6

0.1uF

E9 VOUTD

SDOSDO

VREF

GND

4.99K

CS/CS/

dc1678af

DEMO MANUAL DC1678A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0211 • 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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