QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1466
OCTAL 12-BIT DAC WITH INTERNAL REFERENCE
1
LTC2636
DESCRIPTION
Demonstration circuit DC1466 features the
LTC2636 Octal 12-bit DAC. This device has an
integrated, high accuracy, low-drift refer-
ence. It has a rail-to-rail output buffer
and is guaranteed monotonic. This DAC commu-
nicates through the simple SPI/MICROWIRE
tm
compatible interface.
Design files for this circuit board are
available. Call the LTC factory.
Demoboard
Type
LTC2636 Variation Power Up Full Scale
A LZ Zero 2.5V
B LMI Midscale 2.5V
C HZ Zero 4.096V
D HMI Midscale 4.096
To DC590 Analog
Outputs
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1466
OCTAL 12-BIT DAC WITH INTERNAL REFERENCE
2
QUICK START PROCEDURE
Connect DC1466 to a DC590 USB serial con-
troller 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 cor-
rect control panel will be loaded automati-
cally. Click the COLLECT button to begin
outputting codes to the DACs and reading
back the resulting output voltage for each
DAC.
Complete software documentation is avail-
able from the Help menu item, as features
may be added periodically.
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1466
OCTAL 12-BIT DAC WITH INTERNAL REFERENCE
3
HARDWARE SET-UP
ANALOG CONNECTIONS
ANALOG CONNECTIONSANALOG CONNECTIONS
ANALOG CONNECTIONS
DAC outputs – The eight DAC outputs from
the LTC2636 are brought out to turrets la-
beled VOUTA through VOUTH. These may be
connected to external instruments or other
circuitry.
NOTE:
NOTE:NOTE:
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 LTC2636
When the integrated reference is being
used, the reference voltage may be moni-
tored at this point. An external reference
may also be applied to this turret after
changing the setting in the QuickEval soft-
ware.
GROUNDING AND POWER
GROUNDING AND POWER GROUNDING AND POWER
GROUNDING AND POWER CONNECTIONS
CONNECTIONSCONNECTIONS
CONNECTIONS
Power (Vcc) – Normally DC1466 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 2
grounding strips are provided.
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1466
OCTAL 12-BIT DAC WITH INTERNAL REFERENCE
4