Linear Technology DC273A Guida rapida alla configurazione

dc273af

DEMO MANUAL DC273A

Description

LTC2408

4-/8-Channel 24-Bit µPower

No Latency ΔΣ ADC

The LT C

2408, an 8-channel 24-bit no latency ∆∑ ADC is

featuredontheDC273Ademonstrationboard.TheLTC2408

features a 4ppm linearity, 4ppm full-scale accuracy, 1ppm

offset accuracy, and 0.3ppm RMS noise.

The LTC2408 performs interleaved auto-zero and cali-

bration cycles which are transparent to the user.

The device does not require initialization or configuration,

other than selecting the multiplexer channel.

The board includes a precision 2.5V reference (LT1019-

2.5),as well as bypassingcapacitors,and jumpers to select

line frequency rejection and on board /external reference.

The demonstration board is designed to be incorporated

into a target system, as well as give an example of good

placement of bypass and partitioning of an analog and

digital ground.

Design files for this circuit board are available at

http://www.linear.com/demo

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

Technology Corporation. All other trademarks are the property of their respective owners.

Figure 1. DC273A Set-Up

dc273af

DEMO MANUAL DC273A

Quick start proceDure

All of the digital control lines are on a 0.070" header (J17).

On the DC273A demonstration board CSMUX and CSADC

are tied together, as are SLK and CLK. This allows the ADC

tobe addressed througha minimum of control lines. When

the CSMUX and CSADC are logic High, address data can

be clocked into the MUX. When CSMUX and CSADC are

logic low, conversion data can be clocked out of the ADC.

Refer to the LTC2408 data sheet for a complete description

of the various serial interface modes.

The DC273A incorporates 2 jumpers: JP1, which allows

the on-board or an external reference, to be selected; and

JP2, which allows selection of 50Hz/60Hz line frequency

rejection.

All the analog inputs are provided with turrets along one

edge of the board, positioned to be compatible with clip

leads. Tw o ground connections (J9 and J10) are provided

for interconnection into an analog subsystem or to be used

as separate returns for two signal groups.

Power and ground are provided on J15 and J16, and ref-

erence in and out are provided on J13 and J14.

Interconnection of analog and digital subsystems can be

made through these ground connections, or all should

return to a star ground at a point in the target system.

All ground connections should be as short as possible.

The multiplexer output is linked to the ADC through a 5k

resistor. Both terminals are available, J11 for MUXOUT,

and J12 for ADCIN. As the multiplexer output can be dis-

abled, multiplexer expansion can be brought to either of

these terminals. Optionally, an amplifier (buffer) can be

used to drive ADCIN, without necessarily removing the 5k

resistor. If an amplifier with voltage gain is introduced, it

is recommended that the resistor be removed. Depending

on the source resistance or drive capabilities of nodes driv-

ing the multiplexer inputs, J11 can be tied directly to J12.

Please see the LTC2400 data sheet for more information

on driving the input of the LTC2408.

SeethetimingdiagramforMUX,andDataOutputoperation.

F0 is available on J17 for external conversion clock. See

full data sheet for use of this line, otherwise, leave open.

Use of external clock requires removal of JP2.

The LTC2408’s F0 pin is available on J17 for those applica-

tions where an external oscillator controls the conversion

time of the ADC. JP2 must be removed in this case. Please

consult the LTC2408 data sheet for more information on

the use of F0. If an external oscillator is not required, leave

pin 1 on J17 open.

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 2 C1, C2 CAP., TAN 10µF 16V AVX, TAJB106M016, 3528

2 2 C3, C4 CAP., X7R 1µF 10V AVX, 0805ZC105KAT1A, 0805

3 1 R2 RES., CHIP 3.3 5% TAD CR16-3R3JM, 0603

4 2 R3, R4 RES., CHIP 100 5% TAD CR16-101JM, 0603

5 1 R1 RES., CHIP 5.1k 5% TAD CR16-512JM, 0603

6 16 J1-J16 TERMINAL, TURRET .065" MIL-MAX 2308-02

7 2 JP1-JP2 HEADER, 3×1 .079" CENTER COMM CON 2802S-3G2

8 1 JP3 HEADER, 5×2 .079" CENTER COMM CON 2202S-10G2

9 3 JP1-JP3 SHUNT, CCIJ2MM-138-G COMM CON. CCIJ2MM-138-G

10 1 U2 IC., LT1019ACS8-2.5V LINEAR LT1019ACS8-2.5V, SO8

11 1 U1 IC., LTC2408CG LINEAR LTC2408CG

dc273af

DEMO MANUAL DC273A

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

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

 

 

 

 

 

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









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 



    

  

  

  

       



   



   

  



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 





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





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

dc273af

DEMO MANUAL DC273A

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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