DEMO MANUAL DC1332A
LTC2631
Single 12-/10-/8-Bit I
2
C
V
OUT
DACs with Integrated
10ppm/°C Reference
Description
Demonstration circuit 1332A features the
LTC
®
2631,
a 12-
bit I
2
C DAC. This device establishes a new benchmark for
size and integration of 12-bit DACs and onboard reference.
The DC1332A 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. 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.
Demo BoarD Variations
DEMO BOARD TYPE
DC1332A-A
DC1332A-B
DC1332A-C
DC1332A-D
LTC2631 VARIATION
LTC2631-LM12
LTC2631-LZ12
LTC2631-HM12
LTC2631-HZ12
RESOLUTION (BITS)
12
12
12
12
POWER-UP
Mid-Scale
Zero
Mid-Scale
Zero
FULL-SCALE
2.5V
2.5V
4.096V
4.096V
BoarD photo
RIBBON CABLE
DAC
CONNECTIONS
TO DC590
CONTROLLER
I
2
C ADDRESS JUMPERS
dc1332a F01
Figure 1. DC1332A Connection Diagram
DC1332af
1
DEMO MANUAL DC1332A
Quick start proceDure
1. Connect the DC1332A to a DC590 USB serial controller
using the supplied 14-conductor ribbon cable.
2. Connect the DC590 to the host PC with a standard
USB A/B cable.
3. Run the QuikEval™ evaluation software supplied
with the DC590 or download it from:
www.linear.com/software. The correct program will
be loaded automatically.
Options are available to display the DAC output in voltage,
hex code, or decimal count. Additionally, the reference
voltage may be changed to reflect an actual measured
value, such that the output voltage matches the theoreti-
cal output voltage. The reference mode may be changed
from internal reference to external reference.
Features may be periodically added to the software. See
the software’s help menu for the latest information.
Figure 2. QuikEval Software
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2
DEMO MANUAL DC1332A
harDware setup
JUMPERS
CA0:
This sets the I
2
C address of the LTC2631. These
should be set to 1 (V
CC
) by default.
CA1/REF_SEL:
On the B and D versions of the demo board,
this is used to determine the I
2
C address of the LTC2631.
On the A and C versions of the demo board, this is used
to determine the reference input.
ANALOG CONNECTIONS
DAC outputs are provided on the row of turret posts at
the edge of the board.
GROUNDING AND POWER CONNECTIONS
Power (V
CC
):
Normally, the DC1332A is powered by the
DC590 controller. V
CC
can be supplied to the 5V turret,
however the power supply on the DC590 must be disabled!
Refer to the DC590 Quick Start Guide for more details on
this mode of operation.
Grounding:
Three ground posts are provided.
DC1332af
3
DEMO MANUAL DC1332A
parts List
ITEM
1
2
3
4
1
2
3
DC1332A-A
5
DC1332A-B
5
DC1332A-C
5
DC1332A-D
5
1
U1
IC, LTC2631HTS8-HZ12#PBF, TSOT-23
LINEAR TECHNOLOGY, LTC2631HTS8-HZ12#PBF
1
U1
IC, LTC2631HTS8-HM12#PBF, TSOT-23
LINEAR TECHNOLOGY, LTC2631HTS8-HM12#PBF
1
U1
IC, LTC2631HTS8-LZ12#PBF, TSOT-23
LINEAR TECHNOLOGY, LTC2631HTS8-LZ12#PBF
1
U1
IC, LTC2631HTS8-LM12#PBF, TSOT-23
LINEAR TECHNOLOGY, LTC2631HTS8-LM12#PBF
QTY
2
1
3
1
6
2
2
REFERENCE
C1, C2
J1
R1, R2, R3
U2
E1-E6
JP1, JP2
JP1, JP2
PART DESCRIPTION
CAP., X7R, 0.1µF, 16V, 10%, 0603
HEADER, 2×7 PIN, 0.079"
RES., CHIP, 4.99k, 1/16W, 1%, 0603
IC, 24LC025ST, TSSOP
TESTPOINT, TURRET, 0.095"
0.1" SINGLE ROW HEADER, 3-PIN
SHUNT, 1" BLK
MANUFACTURER/PART NUMBER
AVX, 0603YC104KAT
MOLEX, 87831-1420
VISHAY, CRCW06034K99FKEA
MICROCHIP, 24LC025-I/ST
MILL-MAX, 2501-2-00-80-00-00-07-0
SAMTEC, TSW-103-07-L-S
SAMTEC, SNT-100-BK-G
DC1332A Required Circuit Components
Hardware: For Demo Board Only
DC1332af
4
5
4
3
2
1
J1
D
HDR2X7-079-MOLEX
D
VUNREG
1
5V
2
E1
U1
LTC2631
E2
VCC
5
REF
6
E3
REF
VCC
SCL
SDA
CS
6
SCK/SCL
4
U2 24LC025-I/ST
2
SCL
R3
4.99K
3
SDA
1
1
CA0
8
CA1
E5
GND
VOUT
7
1
8
VCC
C2
0.1uF
Array
1
0
3
3
EEPROM
5
SDA
4
GND
A0
1
A2
3
A1
2
CA1
JP1
2 1
0
CA0
JP2
2
R1
R2
4.99K 4.99K
6
SCL
WP
7
C1
0.1uF
*
schematic Diagram
MOSI/SDA
7
MISO
5
GND
C
EEVCC
10
EESCL
11
C
EESDA
9
EEGND
12
E4
VOUT
NC
14
GND
GND
GND
13
GND
E6
4
GND
8
3
*
Assy Table
B
B
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.
DRAWN
CONTRACT NO.
APPROVALS
HELEN
CHECKED
APPROVED
ENGINEER
DESIGNER
Leo Chen
9/12/07
DATE
9/12/07
TECHNOLOGY
TITLE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
A
LTC2631HTS8-LM12/LZ12/HM12/HZ12
Single 12/10/8-Bit I2C Vout DAC
SIZE
CAGE CODE
DWG NO
A
4
DC1332A-A/B/C/D
Tuesday, September 23, 2008
3
REV
A
SCALE:
FILENAME:
2
SHEET
1
1
OF
1
5
Figure 3. LTC2631 Schematic Diagram
DEMO MANUAL DC1332A
DC1332af
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