Linear Technology QuikEval DC1718A User manual

1
dc1718afb
DEMO MANUAL DC1718A
Description
LTC2471
Selectable 208sps/833sps,
16-Bit, Single-Ended, D S ADC
with I2C Interface
Demonstration circuit 1718A features the LT C
®
2471, a
16-bit high performance Δ∑ analog-to-digital converter
(ADC)withanI2Cinterface.Theinputisunipolarwitharange
of 0-REF. The modulator’s proprietary sampling technique
reducesthe average inputcurrentto less than50nA– orders
of magnitude lower than typical delta sigma ADCs.
DC1718 is a member of Linear Technology‘s QuikEval™
family of demonstration boards.It is designedto allow easy
evaluation of the LTC2471 and may be connected directly
to the target application’s analog signals while using the
BoarD photo
DC590 USB Serial Controller board and supplied software
to measure performance. The exposed groundplanes 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
INPUT
RIBBON CABLE
TO DC590
Figure 1. Proper Measurement Equipment Setup
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.

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dc1718afb
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 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

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dc1718afb
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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dc1718afb
DEMO MANUAL DC1718A
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 5 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
7 3 R2, R3, R4 RES, 0402 4.99kΩ 1% 1/16W NIC NRC04F4991TRF
8 1 U1 IC, 16-BIT DELTA SIGMA I2C ADC WITH INTEGRATED
PRECISION REFRENCE
LINEAR TECH. LTC2471CDD
9 1 U2 IC, IC SERIAL EEPROM 2k MICROCHIP TECH. 24LC025-I/ST
10 1 JP1 SHUNT, 2mm SAMTEC 2SN-BK-G

5
dc1718afb
DEMO MANUAL DC1718A
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
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
A0 0
1
1
3
2
13
VCC
VCC
VCC
VCC
 
 
 




TECHNOLOGY
    

        




1
Tuesday, June 08, 2010
11
16-BIT DELTA SIGMA I2C ADC


N/A
LTC2471CDD
DEMO CIRCUIT 1718A
 
 
 




TECHNOLOGY
    

        




1
Tuesday, June 08, 2010
11
16-BIT DELTA SIGMA I2C ADC


N/A
LTC2471CDD
DEMO CIRCUIT 1718A
 
 
 




TECHNOLOGY
    

        




1
Tuesday, June 08, 2010
11
16-BIT DELTA SIGMA I2C ADC


N/A
LTC2471CDD
DEMO CIRCUIT 1718A
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
LEO C.
FIRST PROTOTYPE
106/04/10
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
LEO C.
FIRST PROTOTYPE
106/04/10
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
LEO C.
FIRST PROTOTYPE
106/04/10
U2
24LC025-I/ST
U2
24LC025-I/ST
A0
1
A1
2
A2
3
GND
4
SDA 5
SCL
6
WP
7
VCC 8
R2
4.99K
1% R2
4.99K
1%
C2 0.1uF C2 0.1uF

R3
4.99K
1% R3
4.99K
1%
JP1JP1
COMP
IN
REF-
REFOUT
VCC
GND
GND
SCL
SDA
GND
GND
A0
U1
LTC2471CDD
COMP
IN
REF-
REFOUT
VCC
GND
GND
SCL
SDA
GND
GND
A0
U1
LTC2471CDD
1
6
2
5
4
8
9
7
10
11
12
3
C4 0.1uF C4 0.1uF
E1
IN
E1
IN
C6 10uF C6 10uF
C3
0.1uF
C3
0.1uF
E2
REFOUT
E2
REFOUT
J1J1
5V
2
SCK/SCL
4
CS
6
GND
8
EEVCC
10
EEGND
12
NC
14
VUNREG
1
GND
3
MISO
5
MOSI/SDA
7
EESDA
9
EESCL
11
GND
13
R4 4.99K
1%
R4 4.99K
1%
C5 0.1uF C5 0.1uF
R1 1KR1 1K
E4
GND
E4
GND

E3
VCC
E3
VCC
C1
0.1uF
C1
0.1uF

6
dc1718afb
DEMO MANUAL DC1718A
 LINEAR TECHNOLOGY CORPORATION 2011
LT 1013 REV B • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation