DEMO MANUAL DC1593A
LTC2635: Quad12-Bit I
2
C
V
OUT
DAC with Internal Reference
DESCRIPTION
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 I
2
C compatible interface.
Design files for this circuit board are available. Call the
LTC factory.
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.
TO DC590
ANALOG
OUTPUTS
DEMOBOARD TYPE
A
B
C
D
E
LTC2635 VARIATION
LMI
LMO
LZ
HMI
HZ
POWER-UP
Mid-Scale
High Impedance
Zero
Mid-Scale
Zero
FULL SCALE (INT. REFERENCE MODE)
2.5V
2.5V
2.5V
4.096V
4.096V
dc1593af
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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.
dc1593af
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DEMO MANUAL DC1593A
QUICK START PROCEDURE
HARDWARE SET-UP
Analog Connections
DAC outputs – The four DAC outputs from the LTC2635
are brought out to turrets labeled V
OUTA
through V
OUTD
.
These may be connected to external instruments or other
circuitry.
NOTE: DAC outputs are not in alphabetical order on the
circuit board.
V
REF
– 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
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 (V
CC
) – Normally DC1593A 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 two grounding
strips are provided.
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DEMO MANUAL DC1593A
PARTS LIST
DC1593A
ITEM
1
2
3
4
5
6
7
8
9
10
11
QUANTITY REFERENCE-DESCRIPTION
3
1
11
4
4
1
2
3
1
1
1
C1, C2, C4
C3
E1 TO E11
JP1 TO JP4
FOR (JP1 TO JP4)
J1
R4, R5
R1, R2, R3
U2
(FOR INVENTORY ONLY)
DESCRIPTION
REQUIRED CIRCUIT COMPONENTS:
CAP CHIP X7R 0.1μF 16V
.,
CAP CHIP X5R 10μF 6.3V
.,
TURRET, TESTPOINT 0.064"
HEADER, 3Pin 1 Row 0.079CC
SHUNT, 0.079" CENTER
HEADER, VERTICAL DUAL 2X7 0.079CC
RES., CHIP 4.99K 1%
RES., CHIP 10K 5%
I.C., SERIAL EEPROM, TSSOP-8
CABLE ASSY., 8" STRIP
STENCIL
AVX, 0603YC104MAT1A 0603
TDK., C2012X5R0J106M
MILL-MAX, 2308-2
SAMTEC, TMM-103-02-L-S
SAMTEC, 2SN-BK-G
MOLEX, 87831-1420
VISHAY, CRCW06034K99FNEA
VISHAY, CRCW060310K0JNEA
MICROCHIP 24LC025-I/ST
,
LINEAR RIBBON CABLE CA-2440
STENCIL 1593A
MANUFACTURER’S PART NUMBER
DC1593A-A
ITEM
1
9
12
QUANTITY REFERENCE-DESCRIPTION
1
1
1
DC1563A
U1
DESCRIPTION
GENERAL BOM
I.C., QUAD 16-BIT, I2C DAC
FAB, PRINTED CIRCUIT BOARD
LINEAR TECH., LTC2635CUD-LMI12
DEMO CIRCUIT 1593A
MANUFACTURER’S PART NUMBER
DC1593A-B
ITEM
1
2
3
QUANTITY REFERENCE-DESCRIPTION
1
1
1
DC1563A
U1
DESCRIPTION
GENERAL BOM
I.C., QUAD 16-BIT, I2C DAC
FAB, PRINTED CIRCUIT BOARD
LINEAR TECH., LTC2635CUD-LMO12
DEMO CIRCUIT 1593A
MANUFACTURER’S PART NUMBER
DC1593A-C
ITEM
1
2
3
QUANTITY REFERENCE-DESCRIPTION
1
1
1
DC1563A
U1
DESCRIPTION
GENERAL BOM
I.C., QUAD 16-BIT, I2C DAC
FAB, PRINTED CIRCUIT BOARD
LINEAR TECH., LTC2635CUD-LZ12
DEMO CIRCUIT 1593A
MANUFACTURER’S PART NUMBER
DC1593A-D
ITEM
1
2
3
QUANTITY REFERENCE-DESCRIPTION
1
1
1
DC1563A
U1
DESCRIPTION
GENERAL BOM
I.C., QUAD 16-BIT, I2C DAC
FAB, PRINTED CIRCUIT BOARD
LINEAR TECH., LTC2635CUD-HMI12
DEMO CIRCUIT 1593A
MANUFACTURER’S PART NUMBER
DC1593A-E
ITEM
1
2
3
QUANTITY REFERENCE-DESCRIPTION
1
1
1
DC1563A
U1
DESCRIPTION
GENERAL BOM
I.C., QUAD 16-BIT, I2C DAC
FAB, PRINTED CIRCUIT BOARD
LINEAR TECH., LTC2635CUD-HZ12
DEMO CIRCUIT 1593A
dc1593af
MANUFACTURER’S PART NUMBER
4
1
2
3
4
5
6
7
8
NOTE: UNLESS OTHERWISE SPECIFIED
1
PRODUCTION
LEO C.
7/20/10
1. ALL RESISTORS ARE IN OHMS 0603
ALL CAPACITORS ARE IN MICROFARADS 0603
2. INSTALL SHUNTS AS SHOWN
A
A
J1
HD2X7
E2
GND
+5V
C1
0.1uF
C2
0.1uF
+5V
C3
10uF
6.3V
E1
REF
VUNREG
E3
1
+5V
5V
16
10
R1
10K
5
SCL
VOUTA
SDA
CA0
CA1
VOUTC
CA2
LDAC
VOUTD
12
11
Exposed Pad
Solder Side
VOUTB
2
1
SDA
8
R6
4.99K
9
7
U2
24LC025
8
NC
VCC
17
14
13
WP
SCL
SDA
VSS
4
A2
3
A1
6
2
A0
R4
4.99K
7
6
5
R5
4.99K
1
GND
GND
REFLO
NC
3
4
R2
10K
R3
10K
2
VCC
SCHEMATIC DIAGRAM
CS
SCL
VCC
REF
6
E4
GND
SCK/SCL
4
E5
E6
E7
E8
SDA/MOSI
7
VOUTA
VOUTB
VOUTC
VOUTD
B
MISO
5
B
EEVCC
10
EESDA
9
EESCL
11
EEGND
12
NC
14
C4
0.1uF
E9
15
U1*
GND
GND
GND
3
8
13
GND
E10
VSS
+5V
1
2
3
1
2
3
+5V
+5V
1
2
3
1
2
3
WP
E11
LDAC
C
C
REFLO
JP1
CA0
1
0
1
0
JP2
CA1
1
0
JP3
CA2
EXT.
GND
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.
JP4
REFLO
*
TECHNOLOGY
D
ASSY
U1
DC1593A-A
LTC2635CUD-LMI12
DC1593A-B
LTC2635CUD-LMO12
D
DC1593A-C
LTC2635CUD-LZ12
DC1593A-D
LTC2635CUD-HMI12
QUAD, 12-BIT, I2C DAC WITH
10PPM/DEGREE CELCIUS REFERENCE
LTC2635CUD
DEMO CIRCUIT 1593A
Tuesday, July 20, 2010
1
4
5
6
7
8
DC1593A-E
LTC2635CUD-HZ12
1
1
2
3
DEMO MANUAL DC1593A
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