Linear Technology QuikEval DC1718A Manual de usuario

dc1718afb

DEMO MANUAL DC1718A

Description

LTC2471

Selectable 208sps/833sps,

16-Bit, Single-Ended, D S ADC

with I2C Interface

Demonstration circuit 1718A features the LT C

2471, a

16-bit high performance Δ∑ analog-to-digital converter

(ADC)withanI2Cinterface.Theinputisunipolarwitharange

of 0-REF. The modulator’s proprietary sampling technique

reducesthe average inputcurrentto less than50nA– orders

of magnitude lower than typical delta sigma ADCs.

DC1718 is a member of Linear Technology‘s QuikEval™

family of demonstration boards.It is designedto allow easy

evaluation of the LTC2471 and may be connected directly

to the target application’s analog signals while using the

BoarD photo

DC590 USB Serial Controller board and supplied software

to measure performance. The exposed groundplanes allow

proper grounding to prototype circuitry. After evaluating

with Linear Technology’s software, the digital signals can

be connected to the end application’s processor/controller

for development of the serial interface.

Design files for this circuit board are available at

http://www.linear.com/demo

INPUT

RIBBON CABLE

TO DC590

Figure 1. Proper Measurement Equipment Setup

L, LT, LTC, LTM, 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.

dc1718afb

DEMO MANUAL DC1718A

quick start proceDure

Connect DC1718 to a DC590 USB Serial Controller using

the supplied 14 conductor ribbon cable. Connect DC590

to host PC with a standard USB A/B cable. Run the evalu-

ation software supplied with DC590 or downloaded from

http://www.linear.com/software. The correct program will

be loaded automatically. Click the COLLECT button to start

reading the input voltage. Details on software features are

documented in the control panel’s help menu.

Tools are available for logging data, changing reference

voltage, changing the number of points in the strip chart

and histogram, and changing the number of points aver-

aged for the DVM display.

Figure 2. Software Screenshot

dc1718afb

DEMO MANUAL DC1718A

harDware set-up

CONNECTION TO DC590 SERIAL CONTROLLER

J1 is the power and digital interface connector. Connect

to DC590 serial controller with supplied 14 conductor

ribbon cable.

ANALOG CONNECTIONS

Analog signal connections are made via the row of turret

posts along the edge of the board. Also, when connecting

the board to an existing circuit the exposed ground planes

along the edges of the board may be used to form a solid

connection between grounds.

GND – This turret is connected directly to the internal

ground planes.

VCC – This is the supply and reference voltage for the ADC.

Do not draw any power from this point.

IN – This is the positive input to the ADC

REFOUT – This turret is connected to the LTC2471 REFOUT

pin. This pin may be used to provide a reference voltage

to an external circuit and can source up to 100µA. Do

NOT drive this pin.

dc1718afb

DEMO MANUAL DC1718A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 5 C1, C2, C3, C4, C5 CAP, 0402 0.1µF 20% 16V X7R TDK C1005X7R1C104M

2 1 C6 CAP, 0603 10µF 10% 6.3V X5R TDK C1608X5R0J106K

3 4 E1, E2, E3, E4 TURRET MILL MAX 2308-2

4 1 JP1 HEADER, 3-PIN, 2mm SAMTEC TMM-103-02-L-S

5 1 J1 HEADER, 2×7 2mm MOLEX 87831-1420

6 1 R1 RES, 0402 1kΩ 5% 1/16W NIC NRC04J102TRF

7 3 R2, R3, R4 RES, 0402 4.99kΩ 1% 1/16W NIC NRC04F4991TRF

8 1 U1 IC, 16-BIT DELTA SIGMA I2C ADC WITH INTEGRATED

PRECISION REFRENCE

LINEAR TECH. LTC2471CDD

9 1 U2 IC, IC SERIAL EEPROM 2k MICROCHIP TECH. 24LC025-I/ST

10 1 JP1 SHUNT, 2mm SAMTEC 2SN-BK-G

dc1718afb

DEMO MANUAL DC1718A

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

VCC

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

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TECHNOLOGY

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

Tuesday, June 08, 2010

16-BIT DELTA SIGMA I2C ADC

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

N/A

LTC2471CDD

DEMO CIRCUIT 1718A

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

 

 







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TECHNOLOGY

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





Tuesday, June 08, 2010

16-BIT DELTA SIGMA I2C ADC





N/A

LTC2471CDD

DEMO CIRCUIT 1718A





 

 









TECHNOLOGY





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









Tuesday, June 08, 2010

16-BIT DELTA SIGMA I2C ADC





N/A

LTC2471CDD

DEMO CIRCUIT 1718A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

FIRST PROTOTYPE

106/04/10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

FIRST PROTOTYPE

106/04/10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

FIRST PROTOTYPE

106/04/10

24LC025-I/ST

GND

SDA 5

SCL

VCC 8

4.99K

0.1uF



4.99K

JP1JP1

COMP

REF-

REFOUT

VCC

GND

SCL

SDA

GND

LTC2471CDD

COMP

REF-

REFOUT

VCC

GND

SCL

SDA

GND

LTC2471CDD

0.1uF

10uF

0.1uF

REFOUT

J1J1

SCK/SCL

GND

EEVCC

EEGND

VUNREG

GND

MISO

MOSI/SDA

EESDA

EESCL

GND

4.99K

0.1uF

R1 1KR1 1K

GND



VCC

0.1uF

dc1718afb

DEMO MANUAL DC1718A

 LINEAR TECHNOLOGY CORPORATION 2011

LT 1013 REV B • PRINTED IN USA

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

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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