Linear Technology LTC6655 Guida rapida alla configurazione

dc2095af

DEMO MANUAL DC2095A

DESCRIPTION

LTC6655

0.25ppm Noise, Low Drift

Precision Reference

Demonstration circuit 2095A features the LTC

6655, a

precision low drift reference packaged in a hermetic LS8.

Thedemonstrationcircuitisavailablewiththe2.5V,4.096V

or 5V output voltage option parts.

Thedemoboardcircuitshowstheoptimallayoutfor overall

reference performance. The LTC6655 has a maximum

drift of 2ppm/°C and an initial accuracy of ±0.025%. The

hermetic package further improves the Long Term Drift

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.

PERFORMANCE SUMMARY

performance of the reference to 20ppm/√kHr. Another

benefit of the hermetic package is improved humidity

performance. Testing has shown that humidity can cause

the PCB to deform and stress the package. To reduce this

effect the ground plane is removed directly under the

reference. Doing this reduces output voltage shift as a

result of humidity to less than 10ppm.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2095A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range VOUT + 0.5 13 V

VOUT Output Voltage Accuracy –0.025 +0.025 %

Long-Term Drift of Output Voltage 20 ppm/√kHr

IQSupply Current 5 mA

dc2095af

DEMO MANUAL DC2095A

With the demonstration circuit, it is easy to set up and

evaluatetheperformanceoftheLTC6655. Referto Figure1

for proper measurement equipment setup and follow the

procedure below:

1. With the power off, connect the power supply positive

to VIN and the common to GND. With default settings,

the supply can range from VOUT +0.5V to 13V.

2. Connect a DVM to the VOUT turret with the common

connection connected to ground.

3. Turn on power supply and conﬁrm reference operation.

Figure 1. Test Setup

2.500V

3.00V

QUICK START PROCEDURE

dc2095af

DEMO MANUAL DC2095A

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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dc2095af

DEMO MANUAL DC2095A

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 0315 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

Thisdemonstration board (DEMO BOARD) kit beingsoldor provided by Linear Technology isintendedfor 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 application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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