Linear Technology DC1546A Quick setup guide

DC1546Af

DEMO MANUAL DC1546A

Description

LTC2754-16

Quad 16-Bit SoftSpan

IOUT DAC

Demonstration circuit 1546A features the LTC2754-16

dual 16-bit SoftSpan™ IOUT DAC. This device features

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

and –2.5V to 7.5V. The DAC has offset adjustment and

gain-adjustment pins to allow optimization of transient

response.

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

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

are the property of their respective owners.

BoarD photo

Design files for this circuit board are available at

http://www.linear.com/demo

Figure 1. DC1546A Connection Diagram

DAC

CONNECTIONS

ANALOG POWER SUPPLY

(NORMALLY ±15V)

RIBBON CABLE

TO DC590

CONTROLLER

dc1546a F01

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DC1546Af

DEMO MANUAL DC1546A

Quick start proceDure

1. Connect a clean ±15V power supply to the AMPV+and

AMPV–turret posts at the bottom of the DC1546A

board.

2. Connect J1 to a DC590 USB serial controller using

the supplied 14-conductor ribbon cable.

3. Connect the DC590 to a host PC with a standard USB

A/B cable.

4. Run the QuikEval™ evaluation software supplied with

the DC590 or download it from www.linear.com/

software. The correct control panel will be loaded

automatically.

The software automatically sets the LTC2754-16 outputs

according to the entries in the control panel. A square

wave option is available to test settling time. The MSPAN

jumper should be low if software span control is desired.

Additional software documentation may be available from

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

Figure 2. QuikEval Software Screenshot

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DC1546Af

DEMO MANUAL DC1546A

harDware setup

JUMPERS

MSPAN: Manual Span Control Pin. MSPAN is used to

configure the LTC2754-16 for operation in a single, fixed

output range. If MSPAN is high it will be configured for

single span use. If MSPAN is low it will be set through the

QuikEval software. The default position is 0 (low).

S0, S1, S2: Used to set the fixed output range if MSPAN

is high. Default is all jumpers removed, allowing software

span control.

S2 S1 S0 SPAN

0 0 0 Unipolar 0V to 5V

0 0 1 Unipolar 0V to 10V

0 1 0 Bipolar –5V to 5V

0 1 1 Bipolar –10V to 10V

1 0 0 Bipolar –2.5V to 2.5V

1 0 1 Bipolar –2.5V to 7.5V

Codes not shown are reserved and should not be used.

VREF: Voltage reference selection for the DAC, either 5V

for the onboard LT1236 reference or EXT if an external

reference source is connected to the VREF turret post.

VOSA, VOSB, VOSC,VOSD: Offset adjustment selection

for DACA, DACB, DACC, DACD. If no offset adjustment is

required, select GND. Selecting EXT connects the offset

pin to the turret allowing external adjustment of offset.

REFADJA, REFADJB, REFADJC, REFADJD:Gain-

adjustment selection for each associated DAC. If no gain-

adjustment is required, select GND. Selecting EXT

connects the gain pin to the turret allowing external

adjustment of gain.

VCC: Select source for 5V VCC supply. Set to 5V for sup-

ply by onboard LT1236 reference (recommended). Set to

REG to be supplied by regulated supply from the DC590

controller and remove the jumper to supply externally.

ANALOG CONNECTIONS

OUTA, OUTB, OUTC, OUTD: DAC Voltage Outputs.

VREF: DAC Reference Voltage. If the onboard LT1236

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.

VOSA, VOSB, VOSC, VOSD: DAC Offset Adjust Input. Use

only if the VOSA/VOSB/VOSC/VOSD jumper is set to EXT.

Nominal input range is ±5V.

REFADJA, REFADJB, REFADJC, REFADJD: Gain-adjust

input for each associated DAC. This control input can be

usedto nullgain erroror tocompensate forreference errors.

Only used if the associated REFADJ jumper is set to EXT.

DIGITAL CONNECTIONS (TURRET POSTS)

CLR:AsynchronousClearPin. Pulled highthrough a10kon

the board but can be driven low to clear all DAC registers.

RFLAG: Reset Flag Pin. Active low output.

LDAC:Asynchronous DACLoad Input. Pulled highthrough

a10k on the board, but can be driven low to update all

DAC registers

GROUNDING AND POWER 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 the schematic and descrip-

tion for the VCC jumper.

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DC1546Af

DEMO MANUAL DC1546A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1546A Required Circuit Components

1 4 C7, C14, C20, C21 CAP., X7R, 150pF, 50V, 10%, 0603 AVX, 06035C151KAT2A

2 4 C16, C17, C18, C19 CAP., COG, 27pF, 50V, 10%, 0603 AVX, 06035A270KAT2A

3 2 C15, C22 CAP., X7R, 0.1µF, 25V, 20%, 0603 TDK, C1608X7R1E104M

4 10 C1-C6, C8, C9-C13 CAP., X5R, 0.1µF, 50V, 20%, 0805 TDK, C2012X7R1H104M

5 4 C1, C8, C23, C24 CAP., X5R, 10µF, 16V, 20%, 1206 TDK, C3216X5R1C106M

6 0 C7, C14, C16-C21 OPT.

7 3 D1, D2, D4 DIODE, SCHOTTKY, SOT23 DIODES INC., BAT54C-7-F

8 1 D3 LED, SMT GREEN PANASONIC, LN1351C-(TR)

9 27 E1-E27 TESTPOINT, TURRET, 0.064" MILL-MAX, 2308-2

10 0 TP1-TP6 OPT.

11 9 JP1-JP7, JP10, JP13 JMP, 3-PIN, 1 ROW, 0.079" SAMTEC, TMM-103-02-L-S

12 4 JP8, JP9, JP11, JP12 JMP, 2×3, 0.079" SAMTEC, TMM-103-02-L-D

13 17 JP1-JP7, JP10, JP13, SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

(JP8, JP9, JP11, JP12 = 2 EA.)

14 1 J1 HEADER, 2×7PIN, 0.079" MOLEX, 87831-1420 (PBF)

15 3 R4-R6 RES., CHIP, 4.99k, 1/16W, 1%, 0603 VISHAY, CRCW06034K99FKED

16 3 R1-R3 RES., CHIP ,10k, 1/16W, 5%, 0603 VISHAY, CRCW060310K0FKED

17 1 U1 I.C., LTC2754AIUKG-16, QFN52UKG LINEAR TECHNOLOGY, LTC2754AIUKG-16

18 4 U2-U5 I.C., LT1469CS8, SO8 LINEAR TECHNOLOGY, LT1469CS8

19 1 U7 I.C., LT1236ACS8-5, SO8 LINEAR TECHNOLOGY, LT1236ACS8-5

20 1 U6 I.C., SERIAL EEPROM, TSSOP8 MICROCHIP, 24LC025-I /ST

21 4 FOR 4 CORNERS STAND-OFF, NYLON (SNAP-ON), 0.625" TALL KEYSTONE, 8834

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DC1546Af

DEMO MANUAL DC1546A

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. LTC2754-16 Schematic Diagram

schematic Diagram

A A

B B

C C

D D

NOTES:

LTC2754AIUKG-16,

16-Bit Quad Serial Precision

Verify Proper And Reliable Operation In The Actual

Performance Or Reliability. Contact Linear Technology

Circuit Board Layout May Significantly Affect Circuit

Circuit That Meets Customer-Supplied Specifications;

Application. Component Substitution And Printed

Linear Technology Has Made A Best Effort To Design A

This Circuit Is Proprietary To Linear Technology And

However, It Remains The Customer's Responsibility To

Supplied For Use With Linear Technology Parts.

Applications Engineering For Assistance.

LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY

Customer Notice

EXT.

GND

EXT.

GND

EXT.

GND

SoftSpan Iout DAC

SCK SDOCS SDI

WP VSS

VCC

EXT.

REFADJD

REFADJC

REFADJB

REFADJA

VOSADJD

VOSADJC

VOSADJB

VOSADJA

EXT.

GND

REF2

REF1

REF3

REF4

M-SPAN

EXT.

Demo Circuit 1546A

Linear Technology Corporation

1630 McCarthy Blvd.

Milpitas, CA. 95035

Phone (408) 432-1900

Fax (408) 434-0507 www.linear.com

1 1Thursday, June 04, 2009

Title

Size Document Number Rev.

Date: Sheet of

VOSADJA

VOSADJB

VOSADJC

VOSADJD

REF1

M-SPAN

REFADJA

REFADJB

REFADJC

REFADJD

S0 M-SPAN

VOSADJA

VOSADJB

VOSADJC

VOSADJD

REFADJA

REFADJD

REFADJB

REFADJC

REF1

REF2

REF3

REF4

REF2

REF3

V+

V-

VCC

V+

V-

VCC

V+

VCC

E14

GND

U5A

LT1469CS8

4 8

4.99K

U2A

LT1469CS8

4 8

0.1uF

50V

JP10

JP4

E10

REFADJA

E12

OUTC

C18

27pF

E15

OUTD

E17

GND

0.1uF

50V

LDAC

Exposed Pad, Solder Side

LTC2754AIUKG-16

CLR

RFLAG

VOSADJD

RINC

IOUT2D

REFADJA

SDI

SCK

SRO

LDAC

M-SPAN

REFADJB

REFADJC

REFADJD

GND

RCOMC

RIND

RCOMD

REFC

ROFSC

RFBC

REFD

ROFSD

RFBD

IOUT1D

IOUT2C

IOUT1C

IOUT2B

IOUT1B

IOUT2A

IOUT1A

VOSADJA

VOSADJB

VOSADJC

RINB

RCOMB

RINA

RCOMA

REFB

ROFSB

RFBB

REFA

ROFSA

RFBA

VDD

JP7

E22

VOSADJC

BAT54C

4.99K

JP1

0.1uF

50V

E13

REFADJB

JP11

TP3

C21

150pF

C23

10uF

16V

C10

0.1uF

50V

10K

TP6

E19

VOSADJA

OUTB

U4B

LT1469CS8

AMP V+

C15

0.1uF

C20

150pF

JP12

E16

REFADJC

JP5

TP2

C11

0.1uF

50V

10uF

16V

LT1236ACS8-5

VIN

GND

VOUT

GND

C17

27pF

C19

27pF

10K

U3B

LT1469CS8

JP2

JP9

U4A

LT1469CS8

4 8

E26

REF4

E18

REFADJD

C14

150pF

AMP V-

RFLAG

BAT54C

LED

GREEN

2 1

C12

0.1uF

50V

TP4TP1

10K

GND

CLR

0.1uF

50V

150pF

C24

10uF

16V

C13

0.1uF

50V

JP8

HD2X7

V+

GND

SCK/SCL

MISO

SDA/MOSI

GND

EESDA

EEVCC

EESCL

EEGND

GND

E24

REF3

JP6

10uF

16V

OUTA

JP3

0.1uF

50V

JP13

E20

VOSADJB

E11

GND

U5B

LT1469CS8

U3A

LT1469CS8

4 8

C22

0.1uF

E23

REF1

C16

27pF

24LC025

6 3

8A0

SCL A2

VSSSDA

A1WP

VCC

U2B

LT1469CS8

4.99K

E25

VOSADJD

0.1uF

50V

E21

REF2

E27

VCC

BAT54C

TP5

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DC1546Af

DEMO MANUAL DC1546A

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 0513 • 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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