DEMO MANUAL DC1493A
16-Bit Differential,
ΔΣ
ADC
with I
2
C Interface
DESCRIPTION
Demonstration circuit 1493A features the LTC
®
2463, a
16-bit high performance
ΔΣ
analog-to-digital converter
(ADC) with an I
2
C interface. The input is differential with a
range of ±REF The modulator’s proprietary sampling tech-
.
nique reduces the average input current to less than 50nA—
orders of magnitude lower than typical delta sigma
ADCs.
DC1493A is a member of Linear Technology’s QuikEval
family of demonstration boards. It is designed to allow easy
evaluation of the LTC2463 and may be connected directly
to the target application’s analog signals while using the
DC590 USB Serial Controller board and supplied software
to measure performance. The exposed ground planes 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
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.
RIBBON CABLE TO
DC590 CONTROLLER
INPUT
DC1493 F01
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC1493A
QUICK START PROCEDURE
Connect DC1493A 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
HARDWARE SETUP
CONNECTION TO DC590 SERIAL CONTROLLER
J1 is the power and digital interface connector. Connect
to DC590 serial controller with supplied 14-conductor
ribbon cable.
Jumpers
A0:
Selects I
2
C address of the LTC2463. This is set to GND
by default. Should this jumper be set to a different setting,
the software should be changed to reflect this.
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
IN–:
This is the negative input to the ADC.
REFOUT :
This turret is connected to the LTC2463 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.
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DEMO MANUAL DC1493A
SCHEMATIC DIAGRAM
dc1493af
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 representation
that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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DEMO MANUAL DC1493A
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 direc-
tive 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
Copyright © 2004, Linear Technology Corporation
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
LT 0510 • PRINTED IN USA
www.linear.com
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