DEMO MANUAL DC1466B
LTC2636
Octal 12-Bit SPI V
OUT
DACs with
10ppm/°C Internal Reference
Description
Demonstration circuit 1466B features the
LTC
®
2636
Octal
12-bit DAC. This device has an integrated, high accuracy,
low-drift reference. It has a rail-to-rail output buffer and is
guaranteed monotonic. This DAC communicates through
the simple SPI compatible interface.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1466B
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.
To DC590
Analog
Outputs
Figure 1
Table 1.
DEMO BOARD TYPE
A
B
C
D
LTC2636 VARIATION (SUFFIX)
LZ
LMI
HZ
HMI
POWER-UP OUTPUT
Zero
Mid-Scale
Zero
Mid-Scale
FULL-SCALE OUTPUT VOLTAGE
2.5V
2.5V
4.096V
4.096V
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DEMO MANUAL DC1466B
Quick start proceDure
Connect DC1466B 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
QuikEval™ evaluation software supplied with DC590 or
download it from
www.linear.com/software.
The correct
control panel will be loaded automatically. The DAC is
updated as changes are made to the GUI screen. Entering
a voltage into a text box will cause the DAC's output to
update immediately. Values may be entered in voltage,
hexadecimal counts, or decimal counts by selecting the
appropriate radio button. The reference mode may also
be changed, and individual DACs can be powered down
by unchecking the "Enable" box.
Complete software documentation is available from the
Help menu item, as features may be added periodically.
Figure 2
2
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DEMO MANUAL DC1466B
HarDware setup
Analog Connections
DAC Outputs –
The eight DAC outputs from the LTC2636
are brought out to turrets labeled VOUTA through VOUTH.
These may be connected to external instruments or other
circuitry.
DAC outputs are not in alphabetical order on the circuit
board.
REF –
The REF turret is connected directly to the reference
pin of the LTC2636. When the integrated reference is be-
ing used, the reference voltage may be monitored at this
point. An external reference may also be applied to this
turret after changing the setting in the evaluation software.
Digital Connections
LDAC
–
Load pin, active low, pulled to V
CC
by a 10k resistor.
Updates the DAC register from the Input register. Do not
assert this pin when using with the evaluation software.
This pin can be used to update all DACs simultaneously,
after individual input registers have been written to.
CLR
–
Clear pin, active low, pulled to V
CC
by a 10k resis-
tor. Asserting this pin clears all DACs to their default
power-up value.
Grounding and Power Connections
Power (V
CC
) –
Normally DC1466 is powered by the DC590
controller. V
CC
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 2 grounding strips
are provided.
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DEMO MANUAL DC1466B
parts List
ITEM
1
2
3
4
5
6
7
8
Parts List – DC1466B-A
2
Parts List – DC1466B-B
2
Parts List – DC1466B-C
2
Parts List – DC1466B-D
2
1
U1
LTC2636CMS-HMI12#PBF, MSOP 16-PIN
LINEAR TECH., LTC2636CMS-HMI12#PBF
1
U1
LTC2636CMS-HZ12#PBF, MSOP 16-PIN
LINEAR TECH., LTC2636CMS-HZ12#PBF
1
U1
LTC2636CMS-LMI12#PBF, MSOP 16-PIN
LINEAR TECH., LTC2636CMS-LMI12#PBF
1
U1
LTC2636CMS-LZ12#PBF, MSOP 16-PIN
LINEAR TECH., LTC2636CMS-LZ12#PBF
QTY
2
1
1
13
1
2
2
1
REFERENCE
C1, C3
C4
C2
E1–E13
J1
R1, R2
R3, R4
U2
PART DESCRIPTION
CAP., X5R, 0.1µF, 16V, 10%, 0402
CAP., X7R, 0.1µF, 16V, 10%, 0603
CAP., X5R, 10µF, 16V, 10%, 0805
TESTPOINT, TURRET, 0.065"
HEADER, 2×7 PIN, 0.079CC
RES., CHIP, 4.99k, 1/16W, 1%, 0603
RES., CHIP, 10k, 1/16W, 1%, 0603
IC, EEPROM 2k BIT 400kHz 8 TSSOP
MANUFACTURER/PART NUMBER
AVX, 0402YD104KAT
AVX, 0603YC104KAT
AVX, 0805YD106KAT
MILL-MAX, 2308-2-00-80-00-00-07-0
MOLEX, 87831-1420
VISHAY, CRCW06034K99FKEA
VISHAY, CRCW06010K0FKEA
MICROCHIP, 24LC025-I/ST
Parts List – All Assembly Types
BoarD revision History
BOARD REV
A
B
10/13
DATE
DESCRIPTION
Original Design
Connected Floating Address Lines on ID EEPROM.
4
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5
4
3
2
1
REVISION HISTORY
ECO
1
1
PRODUCTION
Leo C.
REV
DESCRIPTION
APPROVED
DATE
10-10-12
D
D
J1
C1
0.1uF
C3
E2
REF
0.1uF
GND
C2
10uF
E1
VCC
HDR2X7-079-MOLEX
scHematic Diagram
VUNREG
CS/LD
SCK
SDI
1
U1
1
5V
E3
11
REF
2
*
CS
VCC
6
2
LTC2636-
SCK/SCL
VOUTA
U2 24LC025-I/ST
7
CS/LD
SCK
VOUTD
SDI
VOUTE
VOUTF
VOUTG
GND
GND
4
MOSI/SDA
8
VCC
8
WP
9
10
CLR
LDAC
6
SCL
SDA
GND
A0
1
A1
2
A2
3
R3
10K
R4
10K
12
7
5
VOUTC
4
VOUTB
3
7
C
MISO
5
E4
E5
E6
E7
E8
13
E9
14
E10
VOUTA
VOUTB
VOUTC
VOUTD
VOUTE
VOUTF
VOUTG
C
EEVCC
C4
0.1uF
6
5
4
Array
EEPROM
10
EEGND
R1
R2
4.99K 4.99K
12
EESDA
9
EESCL
11
NC
14
GND
GND
8
3
GND
13
VOUTH
15
E11
VOUTH
16
17
B
B
E12
CLR
E13
LDAC
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.
*
Assy Table
U1
-A
-B
-C
-D
LTC2636CMS - HMI12
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
3
LTC PART#
LTC2636CMS - LZ12
LTC2636CMS - LMI12
LTC2636CMS - HZ12
CUSTOMER NOTICE
APPROVALS
TECHNOLOGY
HZ
Leo C.
A
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
A
12-BIT, OCTAL SPI DAC WITH INTERNAL REFERENCE
SIZE
IC NO.
REV.
N/A
SCALE = NONE
2
LTC2636 FAMILY
DEMO CIRCUIT 1466B
DATE:
1
Wednesday, September 04, 2013
1
SHEET 1
OF 11
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DEMO MANUAL DC1466B
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