DEMO MANUAL DC2095A
LTC6655
0.25ppm Noise, Low Drift
Precision Reference
DESCRIPTION
Demonstration circuit 2095A features the
LTC
®
6655,
a
precision low drift reference packaged in a hermetic LS8.
The demonstration circuit is available with the 2.5V, 4.096V
or 5V output voltage option parts.
The demo board circuit shows the optimal layout for 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
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
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
SYMBOL
V
IN
V
OUT
Long-Term Drift of Output Voltage
I
Q
Supply Current
PARAMETER
Input Supply Range
Output Voltage Accuracy
Specifications are at T
A
= 25°C
CONDITIONS
MIN
V
OUT
+ 0.5
–0.025
20
5
TYP
MAX
13
+0.025
UNITS
V
%
ppm/√kHr
mA
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DEMO MANUAL DC2095A
QUICK START PROCEDURE
With the demonstration circuit, it is easy to set up and
evaluate the performance of the LTC6655. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below:
1. With the power off, connect the power supply positive
to V
IN
and the common to GND. With default settings,
the supply can range from V
OUT
+0.5V to 13V.
2. Connect a DVM to the V
OUT
turret with the common
connection connected to ground.
3. Turn on power supply and confirm reference operation.
3.00V
2.500V
Figure 1. Test Setup
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5
4
3
2
D
1
D
SCHEMATIC DIAGRAM
C
C
B
B
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.
TECHNOLOGY
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DEMO MANUAL DC2095A
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DEMO MANUAL DC2095A
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 application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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Linear Technology Corporation
(408) 432-1900
●
LT 0315 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
FAX:
(408) 434-0507
●
www.linear.com
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