Linear Technology DC752A Guide de configuration rapide

dc752af

DEMO MANUAL DC752A

Description

LTC2704

Quad 16-Bit VOUT Softspan DAC

DemonstrationcircuitDC752A-BfeaturestheLTC2704-16

Quad 16-bit SoftSpan™ VOUT DAC. This device features

six output ranges, 0V to 5V, 0V to 10V, ±5V, ±10V, ±2.5V

and –2.5V to 7.5V that are independently settable for each

channel.EachDAChasanoffsetadjustinputpinandacom-L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

SoftSpan and QuikEval are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners.

pensation pin to allow optimization of transient response.

Design files for this circuit board are available at

http://www.linear.com/demo

Figure 1. Connection Diagram

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dc752af

DEMO MANUAL DC752A

Quick start proceDure

Connect a clean ±15V power supply to the turret posts at

the top of the DC752A board. Connect J1 to a DC590 USB

serial controller using the supplied 14-conductor ribbon

cable. Connect DC590 to a host PC with a standard USB

A/Bcable. Run the QuikEval™ evaluation software supplied

withDC590ordownloaditfromwww.linear.com/software.

The correct control panel will be loaded automatically. The

softwareautomaticallysetstheLTC2704outputsaccording

to the entries in the control panel. A square wave option

is available to test settling time.

Additional software documentation may be available from

the Help menu item, as features may be added periodically.

Figure 2. Software Screenshot

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dc752af

DEMO MANUAL DC752A

JUMPERS

JP8, JP9: Tie points for GND1 and GND2, respectively.

The default selection is TIE for both jumpers. This con-

nects all DAC grounds to the analog ground plane, and is

suitable for most applications that do not have large return

currents into the GND1 and GND2 turrets. Alternatively,

selecting REMOTE allows GND1 and GND2 to differ by as

much as ±300mV from analog ground.

JP1, JP2, JP4, JP6: Sense connections for DACA, DACB,

DACC, and DACD, respectively. Selecting TIE connects

OUTFx (output force) output directly to OUTSx (output

sense). Selecting REMOTE allows for remote sensing of

the output voltage. This also allows a power gain stage

such as the LT1970 to be added with no degradation of

accuracy.

JP3 (REF1): Voltage reference selection for DACA and

DACB, either 5V for the onboard LT1236 reference or

REMOTE if an external reference source is connected to

the REF1 turret post.

JP5 (REF2): Voltage reference selection for DACC and

DACD, either 5V for the onboard LT1236 reference or

REMOTE if an external reference source is connected to

the REF2 turret post.

JP10 (VOSA), JP12 (VOSB), JP11 (VOSC), JP13 (VOSD):

offset adjustment selection for DACA, DACB, DACC, and

DACD, respectively. If no offset adjustment is required,

select GND. Selecting ADJ connects the offset pin to the

associated 10-turn pot, allowing adjustment of the DAC’s

offset.

JP7: Select source for 5V VCC supply. Normally this should

be left in the REF position for lowest noise operation. The

REG position selects the 5V regulated supply from the

14-pin QuikEval connector. To apply an external supply,

remove JP7 completely.

ANALOG CONNECTIONS (TURRET POSTS)

OUTFA, OUTFB, OUTFC, OUTFD: DAC voltage outputs.

OUTSA, OUTSB, OUTSC, OUTSD: DAC feedback inputs.

The LTC2704 RFB inputs have a nominal 10k resistance,

so resistance between this point an the load or buffer

output must be kept low.

REF1,REF2:DAC Reference voltage. If theonboardLT1236

references are selected, the voltage may be measured at

these points. If a remote reference is selected, then an

external reference must be applied to these points.

REFM1, REFM2: Inverted reference output from the

LTC2704.Donotdrivethesepointswithanexternalsource.

POWER AND GROUND CONNECTIONS

Analog Power: The +15V, –15V, and GND turret posts

are the analog supplies for the internal DAC amplifiers.

These should be connected to a well regulated, low noise

power supply.

VCC:Connection to VCC. See schematic and description

for JP7.

Grounding: Separate power and signal grounds are pro-

vided. Signal ground is connected to the exposed ground

planes at the top and bottom edges of the board, and to

the two turrets labeled AGND. Use signal ground as the

reference point for measurements and connections to

external circuits. Any large currents drawn from the DAC

outputs should be returned to the power ground turret

closest to pin 1 on the 14-pin header. In this situation,

GND1 and GND2 can be used to sense the ground voltage

attheload,compensating for return resistance between the

load and power ground return. The maximum difference

in voltage between the load and power ground should be

less than 300mV.

HarDware setup

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dc752af

DEMO MANUAL DC752A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 4 C1, C2, C3, C4 Cap., NPO 27pF 25V 5% AVX 06033A270JAT1A

2 5 C5, C6, C8, C10, C13 Cap., X7R 0.1µF 16V 20% AVX 0603YC104MAT2A

3 3 C7, C11, C12 Cap., X5R 4.7µF 6.3V 20% TDK C1608X5R0J475MT

4 2 C9, C14 Cap., X5R 4.7µF 25V 20% Taiyo Yuden TMK316BJ475ML

5 4 C15, C16, C17, C18 Cap., X7R 0.1µF 25V 10% Taiyo Yuden TMK107BJ104KA

6 4 D1, D3, D4, D5 Diode, Dual Switching Diode ON Semi. BAV99LT1

7 1 D2 LED, GRN Panasonic LN1351-C-TR

8 6 D6, D7, D8, D9, D10, D11 Schottky (Dual) Diode, BAT54S Zetex BAT54S

9 13 JP1-JP13 Headers, 3 Pins 2mm Ctrs. CommConn Con Inc. 2802S-03G2

10 13 XJP1-XJP13 Shunt, 2 Pins 2mm Ctrs. CommConn Con Inc. CCIJ2MM-138GW

11 1 J1 Headers, 14 Pin 2mm Ctrs. Molex 87331-1420

12 2 R2, R1 Res., Chip 10k 0.1W 5% AAC CR16-103JM

13 1 R3 Res., Chip 1k 0.06W 5% AAC CR16-102JM

14 3 R4, R5, R6 Res., Chip 4.99k 0.1W 1% AAC CR16-4991FM

15 4 R9, R10, R13, R14 Pot. 11 Turns 20k Bourns 3224W-1-203E

16 0 TP1, TP4, TP6, TP19, TP20 (Opt) Testpoint

17 20 TP2, TP3, TP5, TP7-TP18, TP21-TP25 Turret, Testpoint Mill Max 2308-2

18 1 U2 I.C., µPWR LDO Linear Technology Corp. LT1790ACS6-5

19 1 U3 EEPROM, Serial MICROCHIP, 24LC025-I /ST

20 2 U4, U5 I.C., Precision Ref. Linear Technology Corp. LT1236ACS8-5

21 1 U6 I.C., SoftSpan DAC Linear Technology Corp. LTC2704CGW-16

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dc752af

DEMO MANUAL DC752A

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

Quad 16-Bit Voltage Output,

Softspan DAC



LTC2704CGW-16

DC752A-A

DC752A-B

"Future Use"

DEMO CIRCUIT 752A

Wednesday, August 09, 2006

1 1

RUDY B

MARK T.

NONE

SCHEMATIC

C:\ORCADWIN\CAPTURE\752A\752A_00_REV4.DSN

SIZE

DATE:

DWG NO. REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

DRAWN:

CHECKED:

APPROVED:

ENGINEER:

DESIGNER:

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

CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCK

CS/LDSRO

SDI

VSS

VCC

REF2

REF1

CLR

LDAC

FLT

CS/LD

SDI

SRO

SCK

VOSD

VOSC

VOSA

VOSB

REFM1

REFM2

VOSA

VOSB

REF1

REFM1 RE FM2

REF2

VOSC

VOSD

+5V

+7V

+15V

-15V

5VREF1

VS V S 5VREF2

VCC

5VREF2

5VREF1

-15V+15V

+5V

VCC

+15V

+7V

GND2

GND1 GND2

GND1

GND2

GND1

GND2

C13

0.1uF

BAV99LT1

TP25

REFM2

4.99K

0.1uF

LT1236ACS8-5

2VOUT

GND TRIM

VIN

TP12

OUTFD

JP9

TIE

REMOTE

GND2

TP16

AGND

TP17

GND1

(Opt)

TP11

OUTSD

TP21

+15V

TP7

OUTFB

TP1

JP7

REG

REF

LT1790

JP4

OUTC

REMOTE

TIE

CCW CW

R10

20K

C12

4.7uF

BAT54S

LT1236ACS8-5

2VOUT

GND TRIM

VIN

(Opt)

TP10

OUTFC

TP22

PGND

LT1790ACS6-5

1 2

3 5

VOUT

GND GND

VIN

DNC DNC

JP13

GND

ADJ

VOSD

JP6

OUTD

REMOTE

TIE

4.99K

TP8

OUTSC

JP8

TIE

REMOTE

GND1

(Opt)

TP23

-15V

4.7uF

25V

TP18

GND2

BAV99LT1

CCW CW

R13

20K

CCW CW

R14

20K

C17

1uF

25V

TP15

AGND

BAT54S

TP9

REF1

TP20

TP5

OUTSB

CCW CW

20K

C18

1uF

25V

24LC025

VSS

VCC

SCL

SDA

D10

BAT54S

C11

4.7uF

JP2

OUTB

REMOTE

TIE

C14

4.7uF

25V

TP4

BAV99LT1

4.7uF

TP24

REFM1

5 6

7 8

9 10



See Table

C1A

OUTSA

OUTFA

AGNDA

C1B

OUTSB

OUTFB

AGNDB

C1C

OUTSC

OUTFC

AGNDC

C1D

OUTSD

OUTFD

AGNDD

VP1

VP2

VCC

REFG1

REF1

REF2

REFG2

LDAC

CS/LD

SDI

SRO

SCK

CLR

FLT

GND

AGND

REFM1

REFM2

VOSA

VOSB

VOSC

VOSD

C10

0.1uF

TP13

REF2

10K

4.99K

JP11

GND

ADJ

VOSC

TP3

OUTFA

10K

TP2

OUTSA

BAT54S

0.1uF

TP14

VCC

JP5

REMOTE

REF2

JP10

GND

ADJ

VOSA

D11

BAT54S

(Opt)

C15

1uF

25V

TP6

TP19

JP1

OUTA

REMOTE

TIE

0.1uF

BAT54S

GRN

FLT

JP3

REMOTE

REF1

C16

1uF

25V

JP12

GND

ADJ

VOSB

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dc752af

DEMO MANUAL DC752A

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 0613 • 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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