1
dc1593af
DEMO MANUAL DC1593A
DESCRIPTION
LTC2635: Quad12-Bit I2C
VOUT DAC with Internal Reference
Demonstration circuit DC1593A features the LTC2635
Quad 12-bit DAC. This device has an integrated, high
accuracy, low-drift reference. It has a rail-to-rail output buf-
fer and is guaranteed monotonic. This DAC communicates
through a simple I2C compatible interface.
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.
DEMOBOARD TYPE LTC2635 VARIATION POWER-UP FULL SCALE (INT. REFERENCE MODE)
A LMI Mid-Scale 2.5V
B LMO High Impedance 2.5V
C LZ Zero 2.5V
D HMI Mid-Scale 4.096V
E HZ Zero 4.096V
Design fi les for this circuit board are available. Call the
LTC factory.
ANALOG
OUTPUTS
TO DC590
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dc1593af
DEMO MANUAL DC1593A
QUICK START PROCEDURE
Connect DC1593A 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
evaluation software supplied with DC590 or download it
from www.linear.com. The correct control panel will be
loaded automatically. Additional software documentation
is available from the Help menu item, as features may be
added periodically.
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dc1593af
DEMO MANUAL DC1593A
HARDWARE SET-UP
Analog Connections
DAC outputs – The four DAC outputs from the LTC2635
are brought out to turrets labeled VOUTA through VOUTD.
These may be connected to external instruments or other
circuitry.
NOTE: DAC outputs are not in alphabetical order on the
circuit board.
VREF – The Ref turret is connected directly to the reference
terminals of the LTC2635. When the integrated reference
is being used, the reference voltage may be monitored
QUICK START PROCEDURE
at this point. An external reference may also be applied
to this turret after changing the setting in the QuikEval
software, to external.
Grounding and Power Connections
Power (VCC) – Normally DC1593A 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 – Ground turrets as well as two grounding
strips are provided.
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dc1593af
DEMO MANUAL DC1593A
PARTS LIST
ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER
REQUIRED CIRCUIT COMPONENTS:
13
C1, C2, C4 CAP., CHIP X7R 0.1μF 16V AVX, 0603YC104MAT1A 0603
21
C3 CAP., CHIP X5R 10μF 6.3V TDK., C2012X5R0J106M
311
E1 TO E11 TURRET, TESTPOINT 0.064" MILL-MAX, 2308-2
44
JP1 TO JP4 HEADER, 3Pin 1 Row 0.079CC SAMTEC, TMM-103-02-L-S
54
FOR (JP1 TO JP4) SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G
61
J1 HEADER, VERTICAL DUAL 2X7 0.079CC MOLEX, 87831-1420
72
R4, R5 RES., CHIP 4.99K 1% VISHAY, CRCW06034K99FNEA
83
R1, R2, R3 RES., CHIP 10K 5% VISHAY, CRCW060310K0JNEA
91
U2 I.C., SERIAL EEPROM, TSSOP-8 MICROCHIP, 24LC025-I/ST
10 1 (FOR INVENTORY ONLY) CABLE ASSY., 8" STRIP LINEAR RIBBON CABLE CA-2440
11 1 STENCIL STENCIL 1593A
ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER
1 1 DC1563A GENERAL BOM
9 1 U1 I.C., QUAD 16-BIT, I2C DAC LINEAR TECH., LTC2635CUD-LMI12
12 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1593A
ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER
1 1 DC1563A GENERAL BOM
2 1 U1 I.C., QUAD 16-BIT, I2C DAC LINEAR TECH., LTC2635CUD-LZ12
3 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1593A
ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER
1 1 DC1563A GENERAL BOM
2 1 U1 I.C., QUAD 16-BIT, I2C DAC LINEAR TECH., LTC2635CUD-LMO12
3 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1593A
DC1593A-A
DC1593A-B
DC1593A-C
DC1593A
DC1593A-D
DC1593A-E
ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER
1 1 DC1563A GENERAL BOM
2 1 U1 I.C., QUAD 16-BIT, I2C DAC LINEAR TECH., LTC2635CUD-HZ12
3 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1593A
ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER
1 1 DC1563A GENERAL BOM
2 1 U1 I.C., QUAD 16-BIT, I2C DAC LINEAR TECH., LTC2635CUD-HMI12
3 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1593A
5
dc1593af
DEMO MANUAL DC1593A
SCHEMATIC DIAGRAM
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.
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
A A
B B
C C
D D
CA1 CA2
1
CA0 REFLO
0
1
0
1
0
GND
EXT.
DC1593A-A LTC2635CUD-LMI12
ASSY
DC1593A-B
U1
DC1593A-C
DC1593A-D
DC1593A-E
LTC2635CUD-LMO12
LTC2635CUD-LZ12
LTC2635CUD-HMI12
LTC2635CUD-HZ12
QUAD, 12-BIT, I2C DAC WITH
10PPM/DEGREE CELCIUS REFERENCE
NOTE: UNLESS OTHERWISE SPECIFIED
*
1. ALL RESISTORS ARE IN OHMS 0603
ALL CAPACITORS ARE IN MICROFARADS 0603
2. INSTALL SHUNTS AS SHOWN
+5V +5V +5V
+5V
+5V
+5V
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LTC2635CUD
DEMO CIRCUIT 1593A
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9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/
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&,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7
3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5
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LTC2635CUD
DEMO CIRCUIT 1593A
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&,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216
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9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/
$33/,&$7,21&20321(1768%67,787,21$1'35,17('
&,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7
3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5
7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&(
7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1'
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LTC2635CUD
DEMO CIRCUIT 1593A
5(9,6,21+,6725<
'(6&5,37,21 '$7($33529('(&2 5(9
LEO C.PRODUCTION1 7/20/10
BB
5(9,6,21+,6725<
'(6&5,37,21 '$7($33529('(&2 5(9
LEO C.PRODUCTION1 7/20/10
BB
5(9,6,21+,6725<
'(6&5,37,21 '$7($33529('(&2 5(9
LEO C.PRODUCTION1 7/20/10
BB
E9
GND
E9
GND
R2
10K
R2
10K
C1
0.1uF
C1
0.1uF
C4
0.1uF
C4
0.1uF
R3
10K
R3
10K
JP1JP1
1
2
3
R1
10K
R1
10K
E8
VOUTD
E8
VOUTD
E5
VOUTA
E5
VOUTA
E1
REF
E1
REF
Exposed Pad
Solder Side
U1*
Exposed Pad
Solder Side
U1*
VOUTB 2
NC
15
LDAC
3
CA1
9
SCL
5
SDA
8
CA2
7
VOUTD 12
VOUTC 11
REF 10
CA0
4
VCC 16
GND
17
REFLO
13
VOUTA 1
GND
14
NC
6
E6
VOUTB
E6
VOUTB
JP2JP2
1
2
3
R5
4.99K
R5
4.99K
SCLSCL
C3
10uF
6.3V
C3
10uF
6.3V
WPWP
E7
VOUTC
E7
VOUTC
C2
0.1uF
C2
0.1uF
JP4JP4
1
2
3
E10
LDAC
E10
LDAC
E2
GND
E2
GND
J1
HD2X7
J1
HD2X7
VUNREG 1
CS 6
GND
3
SCK/SCL 4
MISO 5
5V 2
SDA/MOSI 7
GND
8
EESDA 9
EEVCC 10
EESCL 11
EEGND 12
GND
13
NC 14
U2
24LC025
U2
24LC025
A0 1
SCL
6A2 3
VSS 4
SDA
5
A1 2
WP
7
VCC
8
R4
4.99K
R4
4.99K
E3
VCC
E3
VCC
R6
4.99K
R6
4.99K
E11
REFLO
E11
REFLO
SDASDA
VSSVSS
JP3JP3
1
2
3
E4
GND
E4
GND
6
dc1593af
DEMO MANUAL DC1593A
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 0810 • PRINTED IN USA
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
