DC1716A - Demo Manual

DC1716A
LTC2473:
Selectable 240sps/1ksps 16-Bit,
Differential, ADC with I2C Interface
DESCRIPTION
Demonstration circuit 1716A features the LTC2473, a 16-bit
high performance ΔΣ analog-to-digital converter (ADC)
with an I2C interface. The input is differential with a range
of ±VREF. The modulator’s proprietary sampling technique
reduces the average input current to less than 50nA–orders
of magnitude lower than typical delta sigma ADCs.
DC1716A is a member of Linear Technology’s QuikEval™
family of demonstration boards. It is designed to allow easy
evaluation of the LTC2473 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 and
QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
RIBBON CABLE
TO DC590
INPUTS
DC1716A F01
Figure 1. Proper Measurement Equipment Set-Up
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DC1716A
QUICK START PROCEDURE
Connect DC1716A 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 QuikEval
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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DC1716A
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. The maximum
differential voltage between IN+ and IN– is ±1.25V.
IN–: This is the negative input to the ADC
REFOUT: This turret is connected to the LTC2473 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. This pin is normally at 1.25V.
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DC1716A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
2
7
C1 to C5, C7, C8
CAP, 0402 0.1µF 20% 16V X7R
MURATA, GRM155R71C104KA88D
1
C6
CAP, 0603 10µF 20% 6.3V X5R
MURATA, GRM188R60J106ME47D
3
5
E1, E2, E3, E4, E5
TURRET
MILL MAX, 2308-2-00-80-00-00-07-0
4
1
JP1
HEADER, 3-PIN, 2mm
SAMTEC, TMM-103-02-L-S
5
1
J1
HEADER, 2×7 2mm
MOLEX, 87831-1420
6
2
R1, R5
RES, 0402 1k 5% 1/16W
YAGEO, RC0402JR-071KL
7
3
R2, R3, R4
RES, 0402 4.99k 1% 1/16W
YAGEO, RC0402FR-074K99L
8
1
U1
IC, 16-BIT ADC W/ INTEGRATED PRECISION REFERENCE
LINEAR TECHNOLOGY, LTC2473CDD#PBF
9
1
U2
IC, IC SERIAL EEPROM 2k
MICROCHIP TECH., 24LC025-I/ST
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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
GND
VCC
IN-
IN+
REFOUT
E4
E3
E5
E1
E2
5
VCC
1K
R5
1K
R1
C3
0.1uF
0.1uF
0.1uF
C8
C7
C2
0.1uF
10
9
SDA
SCL
3
2
1
JP1
0
A0
1
VCC
6
1%
1%

4
3




R3
4.99K
R2
4.99K
10uF
0.1uF
5
C6
C4

IN-
IN+
VCC


  

 




U1
LTC2473CDD
0.1uF
C1
12
D
1
REFOUT
2
COMP
GND
GND
GND
13
11
7
4
VCC
REF8
A0
3
3
1
2
3
7
6
A0
A1
A2
WP
SCL
1
REV
8
5
1%
R4
4.99K
TECHNOLOGY
0.1uF
C5
VCC
FIRST PROTOTYPE
DESCRIPTION
LEO C.
NC
EEGND
EESDA
EEVCC
EESCL
MISO
MOSI/SDA
SCK/SCL
CS
5V
VUNREG
J1
DATE
06/02/10
APPROVED
1

LTC2473CDD
2
1
 1
DEMO CIRCUIT 1716A
 Wednesday, June 02, 2010
N/A

1

 1
16-BIT DIFFERENTIAL DELTA SIGMA I2C ADC


 


14
12
9
10
11
5
7
4
6
2
1
REVISION HISTORY
U2
24LC025-I/ST
SDA
 

ECO
2
GND
3
4
GND
8
VCC
GND
4
GND
13
5
A
B
C
D
DC1716A
SCHEMATIC DIAGRAM
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DC1716A
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
LT 0311 • 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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