Linear Technology DC2376A Manuale utente

dc2376af

DEMO MANUAL DC2376A

Description

4-Channel 16-Bit/12-Bit

±10V VOUT SoftSpan DACs with

10ppm/°C Max Reference

Demonstration circuit 2376A features the LT C

2664,

4-channel 16-Bit/12-Bit ±10V VOUT SoftSpan™ DACs with

10ppm/°C max reference in a 5mm ×5mm QFN package.

This device features per-channel SoftSpan configuration

with five output ranges: 0V to 5V, 0V to 10V, ±2.5V, ±5V,

and ±10V. A toggle feature allows any or all DACs to switch

betweentwoprogrammedcodesviaasingleSPIcommand

or by the TGP input pin. The versatile SPI interface can

operate on any logic level between 1.71V and 5.5V, for

easy interface to lower voltage microcontrollers or FPGAs.

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.

DC2376A-A is populated with the 16-bit version of the

LTC2664. DC2376A-B is populated with the 12-bit version

for lower resolution applications.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2376A

Figure 1. Connection Diagram

SIGNAL

GROUND

MEASURE REF VOLTAGE,

MUX OUTPUT

SIGNAL

GROUND

DAC OUTPUTS,

MUX INPUTS

–

OVERTEMPERATURE

OUTPUT

SEE TEXT. LDAC, TGP, CLR

PULLED TO IOVCC W/5kΩ

ANALOG SUPPLIES

(±15V ALLOWS ALL

SOFTSPAN RANGES)

dc2376af

DEMO MANUAL DC2376A

Quick start proceDure

Download and install QuikEval™ from:

http://www.linear.com/designtools/software/#Data

Connect a DC590 controller or DC2026 Linduino with

DC590emulatorfirmwaretotheDC2376Awiththesupplied

ribbon cable. Connect low-noise analog power supplies

as shown in Figure 1. A±15V supply will allow all of the

SoftSpan ranges to be used, refer to the LTC2664 data

sheet for other supply options if not all SoftSpan ranges

are used.

Connect the controller to the host PC’s USB port and run

QuikEval. The DC2376A software will be downloaded and

installed, after which a jumper setting window will appear

as shown in Figure 2. The default settings are internal

reference, SoftSpan operation with 0V to 5V range, 0V

output on power-up. If the jumpers on the board have been

changed to a different configuration, select the appropri-

ate options in the pull-down menus to match the board.

Click OK and the main dialog will appear. The control panel

gives access to all of the LTC2664’s functionality includ-

ing per-channel SoftSpan ranges, toggling, Power-Down,

etc. Detailed instructions are provided in the Help menu.

Figure 2. Jumper Settings Dialog

dc2376af

DEMO MANUAL DC2376A

Figure 3. Main Control Panel

Quick start proceDure

dc2376af

DEMO MANUAL DC2376A

Quick start proceDure

External Connections

J1: Interface connector to DC590 controller or Linduino.

Provides OVP power, SPI interface, and board identifica-

tion.

V–, GND, V+:Analog supplies, connected to the LTC2664

V+and V–pins. Nominally ±15V for operation in all Soft-

Span ranges. Refer to the data sheet for other supply

configurations.

GND: Four additional ground posts and exposed ground

plane around board edge allow solid connection to pro-

totype circuitry and measurement equipment.

VCC: Analog supply voltage. Normally supplied by an

onboard LT1761-5 fixed 5V regulator that is powered

from the V+supply. For single 5V supply applications, VCC

may be tied directly to V+and supplied with 4.5V to 5.5V.

IOVCC: Digital interface power. No connection to this pin is

required when used with a DC590 or Linduino controller.

If another controller is used, connect to digital supply that

powers the SPI bus controller (1.71 to 5.5V).

REF: Connection to the REF pin. In internal reference

mode, the reference voltage may be monitored at this

point. Placing REF_SEL jumper in the EXT position allows

an external reference to be connected to this point.

MUX: Monitor Mux output. Allows surveying the DAC

outputs, as well as the auxiliary MUX inputs, V+, V–REF,

REFLO,andan internal temperature sensor, under software

control. Must be measured with a high impedance meter

(output impedance is nominally 2.1kΩ).

VOUT0 to VOUT3: DAC outputs.

MUXIN0 to MUXIN3: Analog Multiplexer Auxiliary Inputs.

CLR:Asynchronous clear input (pulled high to OVP with

a4.99k resistor). Pull to ground to reset the DAC to the

power-on reset value (determined by MSPx pins.)

TGP: Toggle input (pulled high to OVP with a 4.99k resis-

tor). A high level on this pin enables software toggling. See

data sheet for a complete description of toggle operation.

LDAC:Asynchronous DAC update. If CS/LD is high at the

falling edge of LDAC, DAC outputs will be updated with

the contents of the input registers. If CS/LD is low when

LDAC goes low, the DAC registers are updated after CS/

LD returns high.

OVRTMP:Overtemperature pin (pulled high to IOVCC with

a4.99k resistor). The LTC2664 pulls this pin low if the die

temperature exceeds approximately 160°C. It is released

on the next rising edge of CS/LD.

dc2376af

DEMO MANUAL DC2376A

Quick start proceDure

Table 1

MSP2 MSP1 MSP0 OUTPUT RANGE RESET CODE MANUAL SPAN SoftSpan

0 0 0 ±10V Mid-Scale X

0 0 1 ±5V Mid-Scale X

0 1 0 ±2.5V Mid-Scale X

0 1 1 0V to 10V Zero-Scale X

1 0 0 0V to 10V Mid-Scale X

1 0 1 0V to 5V Zero-Scale X

1 1 0 0V to 5V Mid-Scale X

1 1 1 0V to 5V Zero-Scale X

Jumpers

REF_SEL (JP1): Selects internal or external reference

mode. (See data sheet description of REFCOMP pin.)

MSP0, MSP1, MSP2 (JP2, JP3, JP4): Manual Span

control. Setting all jumpers to the 1 position (Default)

selects SoftSpan operation, with a power-up default span

of 0V to 5V, and reset to Zero-Scale. Other options are

listed in Table 1.

LEDs

OVRTMP:Lights when OVRTMP pin asserts, indicating an

overtemperature state. (Note that LED will light if positive

analog supply is present and OVP is not. OVP is normally

supplied by the controller.)

Test Points

The SPI bus is available on a row of through-hole test

points next to J1 that may be used to monitor the bus or

to drive the bus with an external controller.

EEGND, WP: For factory use only.

dc2376af

DEMO MANUAL DC2376A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 3 C1, C6, C7 CAP, X5R, 10µF 25V, 10%, 1206 MURATA, GRM31CR61E106KA12L

2 9 C2, C3, C8, C9, C11 TO C15 CAP, X7R, 0.1µF 25V, 10%, 0603 MURATA, GRM188R71E104KA01D

3 1 C5 CAP, X7R, 0.01µF 25V, 10%, 0603 MURATA, GRM188R71E103KA01D

4 2 D1, D2 DIODE, SCHOTTKY DUAL 30V, SOT23-3 DIODES INC, BAT54C-7-F

5 23 E1 TO E17, E22, E24, E28 TO E31 TURRET, TESTPOINT 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0

6 4 JP1, JP2, JP3, JP4 HEADER, 2MM SINGLE STR 3POS SULLINS, NRPN031PAEN-RC

7 1 J1 CONN, HEADER 14POS 2MM VERT GOLD MOLEX, 87831-1420

8 1 LED1 LED, RED, LED-ROHM-SML-010VT ROHM, SML-010VTT86L

9 1 Q1 MOSFET, N-CH 60V 300MA SOT-23 VISHAY SILICONIX, 2N7002K-T1-E3

10 0 R1, R2, R10 RES, 0603 OPT

11 8 R3 TO R9, R12 RES, CHIP, 4.99k, 1/10W, 1% 0603 VISHAY, CRCW06034K99FKEA

12 1 R11 RES, CHIP, 1k, 1/10W, 1% 0603 VISHAY, CRCW06031K00FKEA

13 1 U2 IC, LT1761ES5-5, SOT23-5 LINEAR TECHNOLOGY, LT1761ES5-5#PBF

14 1 U3 IC, 24LC025-I/ST, TSSOP8 MICROCHIP, 24LC025-I/ST

DC2376A-A Required Circuit Components

2 1 U1 IC, 16-BIT, QFN32UH-5X5 LINEAR TECHNOLOGY, LTC2664IUH-16

DC2376A-B Required Circuit Components

2 1 U1 IC, 12-BIT, QFN32UH-5X5 LINEAR TECHNOLOGY, LTC2664IUH-12

dc2376af

DEMO MANUAL DC2376A

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

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL CAPACITORS ARE IN MICROFARADS, 0603.

ASSY

LTC2664-16

-Bit

12LTC2664-12

*SUFFIX

V+

V-

+5V

V-

V+

+5V

OVP

+5V +5V

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MARK T.PRODUCTION1 08-04-15

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MARK T.PRODUCTION1 08-04-15

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MARK T.PRODUCTION1 08-04-15

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

Tuesday, August 04, 2015

QUAD 16/12-BIT +/-10V VOUT SOFT SPAN DACS

KIM T.

MARK T.

N/A

LTC2664IUH FAMILY

DEMO CIRCUIT 2376A

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

Tuesday, August 04, 2015

QUAD 16/12-BIT +/-10V VOUT SOFT SPAN DACS

KIM T.

MARK T.

N/A

LTC2664IUH FAMILY

DEMO CIRCUIT 2376A

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

Tuesday, August 04, 2015

QUAD 16/12-BIT +/-10V VOUT SOFT SPAN DACS

KIM T.

MARK T.

N/A

LTC2664IUH FAMILY

DEMO CIRCUIT 2376A

JP4

MSP2

SCK

4.99k

E17

GND

E13

GND JP2

MSP0

4.99k

E11 MUXIN2

C11

0.1uF

GND

E10

IOVCC

E9 MUXIN1

SDI

4.99k

E22

CLR

10uF

25V

1206

10uF

25V

1206

4.99k

C14

0.1uF

C15

0.1uF

EEPROM

ARRAY

24LC025-I /ST

SDA 5

VCC 8

A0 1

A1 2

A2 3

GND

WP 7

SCL 6

E15 VOUT3

10uF

25V

1206

V-

R11

0.1uF

R10

OPT

E5 REF

SDO

E28 MUX

GND

E12 VOUT2

LED1

RED

2 1

OPT

E14

TGL

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

JP3

MSP1

E4 GND

4.99k

0.1uF

E31

VCC

4.99k

OPT

GND

C12

0.1uF

4.99k

R12

4.99k

BAT54C

1 3

BAT54C

1 3

2N7002

C13

0.1uF

E6 MUXIN0

E16 MUXIN3

0.01uF

EEGND

CS/LD

E24

LDAC

LT1761ES5-5

BYP 4

OUT 5

VIN

GND

SHDN

E29 OVRTMP

V+

E8 VOUT1

0.1uF

E7 VOUT0

JP1

REF SEL

INT

EXT

LTC2664 *

VOUT3 22

MUXIN3 23

V+ 7

MUXIN2 20

VOUT2 21

TGP

V-

MUXOUT 9

REFLO

GND

REFCOMP 26

REFLO

GND

VCC 28

LDAC

MSP2

MSP0

MSP1

IOVCC 18

VOUT0 3

OVRTMP 30

REF 25

VOUT1 4

MUXIN0 2

CLR

SDI

CS/LD

SCK

SDO

MUXIN1 5

E30 GND

0.1uF

dc2376af

DEMO MANUAL DC2376A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0915 • 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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