DC1718A - Demo Manual

DEMO MANUAL DC1718A
Description
LTC2471
Selectable 208sps/833sps,
16-Bit, Single-Ended, D S ADC
with I2C Interface
Demonstration circuit 1718A features the LTC®2471, a
16-bit high performance Δ∑ analog-to-digital converter
(ADC) with an I2C interface. The input is unipolar with a range
of 0-REF. The modulator’s proprietary sampling technique
reduces the average input current to less than 50nA – orders
of magnitude lower than typical delta sigma ADCs.
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.
DC1718 is a member of Linear Technology‘s QuikEval™
family of demonstration boards. It is designed to allow easy
evaluation of the LTC2471 and may be connected directly
to the target application’s analog signals while using the
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 and
QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Board Photo
RIBBON CABLE
TO DC590
INPUT
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC1718A
quick start procedure
Connect DC1718 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 evaluation 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 averaged for the DVM display.
Figure 2. Software Screenshot
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DEMO MANUAL DC1718A
hardware set-up
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 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
REFOUT – This turret is connected to the LTC2471 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 DC1718A
parts list
ITEM
QTY
1
5
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
C1, C2, C3, C4, C5
CAP, 0402 0.1µF 20% 16V X7R
TDK C1005X7R1C104M
2
1
C6
CAP, 0603 10µF 10% 6.3V X5R
TDK C1608X5R0J106K
3
4
E1, E2, E3, E4
TURRET
MILL MAX 2308-2
4
1
JP1
HEADER, 3-PIN, 2mm
SAMTEC TMM-103-02-L-S
5
1
J1
HEADER, 2×7 2mm
MOLEX 87831-1420
6
1
R1
RES, 0402 1kΩ 5% 1/16W
NIC NRC04J102TRF
NIC NRC04F4991TRF
7
3
R2, R3, R4
RES, 0402 4.99kΩ 1% 1/16W
8
1
U1
IC, 16-BIT DELTA SIGMA I2C ADC WITH INTEGRATED LINEAR TECH. LTC2471CDD
PRECISION REFRENCE
9
1
U2
IC, IC SERIAL EEPROM 2k
MICROCHIP TECH. 24LC025-I/ST
10
1
JP1
SHUNT, 2mm
SAMTEC 2SN-BK-G
4
dc1718afb
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.
A
B
C
IN
REFOUT
GND
E1
E2
E4
E3
C3
5
R1 1K
0.1uF
VCC
0.1uF
C2
9
VCC
SDA
SCL
10uF
0.1uF
JP1
0
A0
1
1%
1%

4
3


R3
4.99K
R2
4.99K



3
2
1
VCC
6
5
C6
C4


  

 




IN
LTC2471CDD
U1
0.1uF
C1
1
REFOUT
2
COMP
12
VCC
GND
GND
GND
GND
13
11
10
7
4
REF8
A0
3
VCC
3
1
2
3
7
6
A0
A1
A2
WP
SCL
1
REV
8
5
0.1uF
TECHNOLOGY
NC
EEGND
EESDA
EEVCC
EESCL
MISO
MOSI/SDA
SCK/SCL
CS
5V
VUNREG

2
1
 1
DEMO CIRCUIT 1718A
LTC2471CDD
 1
1



 


14
12
9
10
11
5
7
4
6
2
1
LEO C.
J1
DATE
06/04/10
APPROVED
1
16-BIT DELTA SIGMA I2C ADC
 Tuesday, June 08, 2010
N/A

1%
R4
4.99K
C5
VCC
FIRST PROTOTYPE
DESCRIPTION
REVISION HISTORY
U2
24LC025-I/ST
SDA
 

ECO
2
GND
3
D
4
GND
8
VCC
GND
4
GND
13
5
A
B
C
D
DEMO MANUAL DC1718A
Schematic Diagram
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DEMO MANUAL DC1718A
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.
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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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dc1718afb
Linear Technology Corporation
LT 1013 REV B • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2011
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