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DEMO MANUAL DC1529A
Description
LTC2657: 16-Bit Octal
Rail-to-Rail DAC
with I2C Interface
Demonstration circuit 1529A features the LTC2657 Octal
16-bit DAC with ±4LSB INL error. This device establishes
a new board-density benchmark for 16-bit DACs and
advances performance standards for output drive, cross-
talk and load regulation in single supply, voltage-output
multiple DACs. 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.
DC1529A has many features for evaluating the performance
of the LTC2657.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1529A
DEMO BOARD TYPE LT C 2657 VARIATION FULL SCALE
DC1529A-A LTC2657BCUFD-L16 2.5V
DC1529A-B LTC2657BCUFD-H16 4.096V
TO
DC590
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DEMO MANUAL DC1529A
Quick start proceDure
Connect DC1529A to a DC590 USB serial controller using
the supplied 14 conductor ribbon cable. Connect DC590 to
a host PC with a standard USB A/B cable. Run the evalu-
ation software supplied with DC590 or download it from
www.linear.com/software. The correct control panel will
be loaded automatically.
If an external reference is used, click the “External” but-
ton in the control panel and enter the reference voltage
in the text block.
Complete software documentation is available from the
Help menu item, as features may be added periodically.
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DEMO MANUAL DC1529A
HarDware setup
Jumpers
JP1: VREF Select. Either an Internal or External reference
can be selected. To drive through the VREF pin, set to Ex-
ternal and connect a clean reference voltage to the VREF
turret. Default is the internal reference.
JP2: Power-Up Mode. The LTC2657 can be set to either
power-up in mid-scale or zero-scale. Default is zero-scale.
JP3, JP4, JP5: I2C Address Selection Jumpers. Set ad-
dress here and double check that the address selected in
software matches. By default all jumpers are tied to GND.
Analog Connections
DAC Outputs: The eight DAC outputs from the LTC2657
are brought out to turrets labeled VOUTA through VOUTH.
These may be connected to external instruments or other
circuitry.
Note: DAC outputs are not in alphabetical order on the
circuit board.
VREF: The VREF turret is connected directly to the reference
terminals of the LTC2657. When the onboard reference
is being used, the reference voltage may be monitored at
this point. An external reference may also be applied to
this turret after setting JP1 to External.
Grounding and Power Connections
Power (VCC): Normally DC1529A is powered by the DC590
controller. VCC can be supplied to this turret, however
the power supply on DC590 must be disabled! Refer to
DC590 Quick Start Guide for more details on this mode
of operation.
Grounding: There is one common ground plane on the
board. All GND pins on the LTC2657 are tied to this ground
plane through low impedance paths. Use the GND turrets
as a reference point for measurements and connections
to external circuits.Tw o bare ground strips are provided
on the top and the bottom of the demo board.
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DEMO MANUAL DC1529A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C6, C7, C8 CAP., CHIP X7R 0.1µF 16V 0603 AVX, 0603YC104MAT1A
2 0 C1, C4 (Opt.) CAP., CHIP X7R 0.1µF 16V 0603 AVX, 0603YC104MAT1A
3 0 C2 (Opt.) CAP., CHIP X5R 4.7µF 6.3V 0805 TAIYO YUDEN, JMK212BJ475MG
4 0 C3, C5 (Opt.) CAP., CHIP X5R 10µF 6.3V 0805 TDK, C2012X5R0J106M
5 15 E1-E15 TURRET, TESTPOINT 0.064" MILL-MAX, 2308-2
6 0 PAD1, PAD2 Opt.
7 3 JP3-JP5 HEADER, 3-PIN 1 ROW 0.079CC SAMTEC, TMM-103-02-L-S
8 1 JP2 HEADER, 2-PIN 2 ROW 0.079CC SAMTEC, TMM-102-02-L-D
9 1 JP1 HEADER, 2-PIN 4 ROW 0.079CC SAMTEC, TMM-104-02-L-D
10 5 FOR (JP1-JP5) SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G
11 1 J1 HEADER, VERTICAL DUAL 2X7 0.079CC MOLEX, 87831-1420
12 3 R1-R3 RES., CHIP 4.99K 1% 0603 VISHAY, CRCW06034K99FKEA
13 0 U1 (Opt.) I.C., MICROPOWER SOT-23 LOW DROPOUT LINEAR TECH., LT1790ACS6
14 0 U2 (Opt.) I.C., PRECISION REFERENCE LINEAR TECH., LT1236ACS8-5
15 1 U4 I.C., SERIAL EEPROM, TSSOP-8 MICROCHIP, 24LC025-I/ST
DC1529A-A Required Circuit Components
16 1 U3 I.C., LTC2657BCUFD-L16, UFD-20 LINEAR TECH., LTC2657BCUFD-L16#
DC1529A-B Required Circuit Components
16 1 U3 I.C., LTC2657BCUFD-H16, UFD-20 LINEAR TECH., LTC2657BCUFD-H16#
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DEMO MANUAL DC1529A
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
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
A A
B B
C C
D D
NOTES:
CA2CA1
VCC
GND
CA0
VCC
GND
LTC2657CUFD-16,
DACs with Integrated Reference
Ext2
VREF
Internal
External
GND
VCC
Ext1
PORSEL
Verify Proper And Reliable Operation In The Actual
Performance Or Reliability. Contact Linear Technology
Circuit Board Layout May Significantly Affect Circuit
Circuit That Meets Customer-Supplied Specifications;
Application. Component Substitution And Printed
Linear Technology Has Made A Best Effort To Design A
This Circuit Is Proprietary To Linear Technology And
However, It Remains The Customer's Responsibility To
Supplied For Use With Linear Technology Parts.
Applications Engineering For Assistance.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
Customer Notice
Mid Scale
Zero Scale
Octal I2C 16-Bit Rail-to-Rail
(Opt.)
(Opt.)
(Opt.)
(Opt.)
(Opt.)
(Opt.)
(Opt.)
Demo Circuit 1529A
A
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA. 95035
Phone (408) 432-1900
Fax (408) 434-0507 www.linear.com
11
Wednesday, April 22, 2009
Title
Size Document Number Rev.
Date: Sheet of
V+
V+
VCC
V+
VCC
VCC
VCC
R3
4.99K
E12
VOUTG
E4
V+
E14
GND
E1
VREF
JP4
1
2
3
pad2
SDA
Exposed Pad
Solder Side
U3
LTC2657CUFD-16
13
12
1
5
6
7
8
9
10
15
16
4
3
2
11
14
17
18
19
20
21
VOUTE
PORSEL
VOUTB
REFIN/OUT
LDAC
CA1
SCL
SDA
CA2
VOUTG
VOUTH
VOUTD
VOUTC
REFCOMP
CA0
VOUTF
VCC
GND
REFLO
VOUTA
GND
R2
4.99K
JP1
12
3
56
78
4
C3
10uF
6.3V
E6
VCC
C7
0.1uF
JP2
12
34
U1
LT1790ACS6
1
4 6
2
GND
VI VO
GND
C6
0.1uF
C4
0.1uF JP5
1
2
3
E8
VOUTC
C2
4.7uF
6.3V
C5
10uF
6.3V
E9
VOUTD
JP3
1
2
3
E2
GND
J1
HD2X7
1
6
3
4
5
2
7
8
9
10
11
12
13
14
V+
CS
GND
SCK
MISO
5V
SDA/MOSI
GND
EESDA
EEVCC
EESCL
EEGND
GND
NC
C1
0.1uF
E5
VOUTA
pad1
SCL
R1
4.99K
E10
VOUTE
C8
0.1uF
E13
VOUTH
E15
LDAC
E7
VOUTB
U4
24LC025
1
6 3
45
27
8A0
SCL A2
VSSSDA
A1WP
VCC
E3
GND
U2
LT1236ACS8-5
2
4
6
VIN
GND
VOUT
E11
VOUTF
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dc1529afa
DEMO MANUAL DC1529A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2010
LT 1013 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C 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 LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
