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dc1703af
DEMO MANUAL DC1703A
HarDware set-up
Jumpers
REF: V
REF
Select. This jumper selects which mode the
LTC2655 powers up in: external reference (EXT) or internal
reference (INT).
PORSEL: Power-Up Mode. The LTC2655 can be set to
either power-up in mid-scale or zero-scale.
CA2, CA1, CA0: Address Selection Jumpers. These jumpers
are used to select the I
2
C address of the DAC. Any changes
here should also be made in the QuikEval software.
Analog Connections
DAC Outputs: The 4 DAC outputs from the LTC2655 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 V
REF
turret is connected directly to the reference
terminals of the LTC2655. The on-chip reference may be
turned off, allowing the DAC reference pin to be driven
from this turret. Alternatively, when the on-chip reference
is on and active, the voltage can be monitored at this turret.
V
+
: Unregulated 10V is present here when a DC590 is
connected. This turret is provided for monitoring purposes
only and should not be connected to any other turrets on
the board.
Grounding and Power Connections
Power (V
CC
): Normally the DC1703A 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: There are 3 ground turrets provided (labeled
GND), as well as ground strips on the top and the bottom
of the board.
