Linear Technology LTC2418 Guida rapida alla configurazione

dc571af

DEMO MANUAL DC571A

DESCRIPTION

LTC2418

8-/16-Channel Differential

24-Bit ∆Σ ADC

The LTC

2418 is a high resolution, 24-bit ΔΣADC with

5ppm INL and5μVoffset. Channel selectionis programmed

through a simple serial interface. Since there is no latency,

each conversion is valid, even after a change in input

channel.

DC571A is a member of Linear Technology‘s QuikEval™

family of demonstration boards.

It is designed to allow easy evaluation of the LTC2418 and

maybeconnecteddirectlytothetargetapplication’s analog 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.

signals while using the DC590 USB serial controller board

and supplied software to measure performance.

After evaluating with LTC’s software, the digital signals can

be connected to the application’s processor/controller for

development of the serial interface.

Design files for this circuit board are available at

http://www.linear.com/demo

QUICK START PROCEDURE

Connect DC571 to 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 evalua-

tion software supplied with DC590 or downloaded from

www.linear.com/software. The correct program will be

loaded automatically.

ClicktheCOLLECTbuttontostartreadingtheinputvoltage.

Click the slider at the bottom of the strip-chart display to

change the input channel being displayed. For differential

measurements, Even channel pos and odd channel pos

correspond to even channels being positive inputs or

odd channels being positive inputs, respectively. See the

LTC2418 data sheet for details of channel selection.

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 1. DC590 Program

dc571af

DEMO MANUAL DC571A

HARDWARE SETUP

JUMPERS

JP1: Select the connection for the common pin, either

ground or external connection. Single-ended measure-

ments are taken with respect to this pin.

JP2 and JP3: Select the source for differential reference.

Selecting 5V and GND will use the onboard 5V reference.

Select EXT to use an external reference.

JP5: Select notch frequency, 60Hz or 50Hz. Alternatively,

this jumper may be removed and an external conversion

clock applied to the center pin of JP5.

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 turret posts

along the edge of the board (CH0 to CH15.) Also, if you are

connecting the board to an existing circuit, make full use

of the four ground connections at the corners of the board.

EXPERIMENTS

Figure 2 shows a number of applications for the LTC2418.

CH0, CH1, CH2

Channels 0 and 1 measure the differential output of an

Intersema MS5401 absolute pressure sensor. The 6.8k

resistor performs a first order temperature compensation

of the bridge output. CH2 measures the bridge voltage,

which provides a convenient temperature measurement.

This can also be used to perform further temperature

compensation in software.

CH3

Channel 3 measures the output of a thermistor in a half

bridge circuit. Many thermistors will work, the constraints

are that the bridge output must have an impedance of

less than 20k and the voltage must not go above VREF/2.

CH4

Channel 4 measures the output of a type J thermocouple.

The circuit shown for channel 3 can be used for cold junc-

tion compensation. The cold junction sensor should be

close to the connections of the thermocouple to the board.

CH5

Channel 5 measures the output of an Omega OS36-01

infrared thermocouple. This can be used for remote tem-

perature measurement.

CH6

Channel 6 measures the photocurrent of a Hamamatsu

S1336-5BK photodiode.

CH7

Channel 7 measures the output of a resistive attenuator.

CH8, CH9

Channels 8 and 9 measure the drop across a Deltec SWE-

3000-50 current shunt. Up to 3000A can be measured,

with a resolution of 60mA. With careful grounding, both

positive and negative currents can be measured. Care

must be taken to ensure that both inputs stay more posi-

tive than GND–0.3V.

CH10

Channel 10 is buffered with an LT1793 FET input amplifier

suitable for very high source impedance measurements.

CH11

Channel 11 measures the output of a precision rectifier.

CH12, CH13

Channels 12 and 13 measure a 3-wire RTD. The differential

voltage is the output, and CH12 single-ended reading is

the ground lead compensation.

CH14, CH15

Channels 14 and 15 measure the output of a 350Ω bridge.

This is standard for a wide variety of sensors. Typically

the full-scale output voltage is only 10mV. However, the

LTC2418 still gives 13 effective bits of resolution with no

amplification.

dc571af

DEMO MANUAL DC571A

Figure 2. LTC2418 Applications

EXPERIMENTS

dc571af

DEMO MANUAL DC571A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 1 C1 CAP, X5R, 10μF 6.3V, 20%, 0805 TDK, C2012X5R0J106M

2 1 C2 CAP, X7R 0.01μF 16V 10%, 0603 AVX, 0603YC103KAT1A

3 1 C3 CAP, X5R 4.7μF 6.3V, 20%, 0805 TAIYO YUDEN, JMK212BJ475MGT

4 5 C4, C5 ,C6, C7, C8 CAP, X7R 0.1μF 16V, 0603 AVX, 0603YC104MAT1A

5 26 E1 TO E26 TESTPOINT, TURRET, 0.064" MILL-MAX, 2308-2

6 5 JP1, JP2, JP3, JP4, JP5 JMP, 3PIN 1 ROW 0.079CC COMM-CON, 2802S-03-G1

7 5 SHUNTS FOR JP1 TO JP5 SHUNT, 0.079" CENTER COMM-CON CCIJ2MM-138G

8 1 J1 HEADER, 2 x 7PIN, 0.079CC MOLEX, 87331-1420

9 0 R1 RES, 0606 OPT

10 1 R2 RES, CHIP 100 1/16W 5%, 0603 AAC, CR16-101JM

11 2 R4, R3 RES, CHIP 4.99k 1/16W 1%, 0603 AAC, CR16-4991FM

12 1 R5 RES, CHIP 10k 1/16W 5%, 0603 AAC, CR16-103JM

13 1 U1 IC, LTC2418CGN, SSOP16GN LINEAR TECHNOLOGY, LTC2418CGN

14 1 U2 IC, NC7SZ157P6X, SC70-6P FAIRCHILD SEMI, NC7SZ157P6X

15 1 U3 IC, 24LC025, TSSOP-8 MICROCHIP, 24LC025-I /ST

16 1 U4 IC, NL17SZ74US, US8 ON SEMI, NL17SZ74US

17 1 U5 IC, LT1236ACS8-5, SO8 LINEAR TECHNOLOGY, LT1236ACS8-5

dc571af

DEMO MANUAL DC571A

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

2. INSTALL SHUNT ON JP1-JP5 PIN 1 AND 2.

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

EXT

GND

EXT

GND

60Hz

50Hz

NORMALTRIGGERED

DC571A-1 * LTC2418CGN

Thursday,January09,2003 11

8-CHANNEL DIFFERENTIAL 24-BIT ADC

KIM T.

MARK T.

SCHEMATIC

SIZE

DATE:

DWGNO. REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

DRAWN:

CHECKED:

APPROVED:

ENGINEER:

DESIGNER:

TECHNOLOGY

Fax: (408)434-0507

Milpitas,CA 95035

Phone: (408)432-1900

1630McCarthyBlvd.

LTC Confidential-For Customer Use Only

TRIG

MOSI

SCK

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

CH15

CH14

CH13

CH12

CH11

CH10

CH9

CH8

COM

VOUT

REF+

CS/

VIN

REF-

MISO

VCC

SDO

VCC

E21

REF+

E10

GND

0.1UF

JP3

REF-

LT1236ACS8-5

8NC

VIN

GNDTRIM

VOUT

4.7UF,6.3V

0805

JP2

REF+

0.1UF

4.99K

E25

GND

E12

CH6

E14

CH4

GND

E15

CH3

E18

CH0

0.01UF

E16

CH2

24LC025

SDA

VCCA0

VSS

SCL

JP1

COM

E17

CH1

E13

CH5

100

E11

CH7

CH11

NC7SZ157P6X

VCC

GND

0.1UF

E24

GND

CH12

E20

COM

HD2X7-079-MOLEX

E19

VCC

JP4

TRIG MODE

CH14

NL17SZ74US

6 7

CLR PR

VCCGND

CH10

E26

CH9

CH13

CH15

E23

TRIG

0.1UF

CH8

JP5

10K

OPT

4.99K

E22

REF-

LTC2418CGN

CH12

CH15

CH8

CH9

CH10

CH11

CH14

CH13

SDI

SCK

SDO

GND

CH5

CH4

CH3

CH2

CH1

CH0

CH6

CH7

VCC

COM

REF+

REF-

10UF,6.3V

0805

dc571af

DEMO MANUAL DC571A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0612 • 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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