Quick Start Procedure; Hardware Setup - Linear Technology DC1792A Manual

DEMO MANUAL DC1792A

Quick start proceDure

Additional software documentation may be available from
the Help menu item, as features may be added periodically.
Figure 2. Software Screenshot
HARDWARE SET-UP
Jumpers
MSPAN: Manual Span Control Pin. MSPAN is used to
configure the LTC2756 for operation in a single, fixed
output range. If MSPAN is 1 (high) it will be configured
for single span use. If MSPAN is low it will be set through
the QuikEval Software. Default position is 0 (low).
™
S0, S1, S2: Used to set the fixed output range if MSPAN
is 1 (high).
Table 1. MSPAN Configuration
S2
0
0
0
0
1
1
GEADJ: Gain Adjust Pin. If no adjustments are required,
select GND. Selecting EXT. connects the pin to the turret
allowing external adjustment to null gain error or com-
pensate for reference errors.
VOSADJ: Offset Adjustment Selection for DAC. If no
offset adjustment is required, select GND. Selecting EXT
connects the offset pin to the turret allowing external
adjustment of offset.
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S1 S0
0 0
0 1
1 0
1 1
0 0
0 1 –2.5V to 7.5V
V : Select source for 5V V
CC
ply by onboard LTC6655 reference (recommended). Set
to REG to be supplied by regulated supply from DC590
Controller and remove the jumper to supply externally.
V : Select source for reference. Set to 5V to use onboard
REF
LTC6655 reference or select EXT to drive externally through
the V jumper.
REF
CLR: Asynchronous Clear Input. Tie to 0 to set all DAC
outputs to 0V.
LDAC: Asynchronous DAC Load Input. Tie to 0 to update
all DACS if _CS is high.
RFLAG: Reset Flag Output. Remove jumper and probe
middle pin for RFLAG status.
Analog Connections (Turret Posts)
V : DAC Voltage Output.
OUT
V : DAC Reference Voltage. If the onboard LTC6655
REF
reference is selected, the voltage may be measured at these
points. If a remote reference is selected, then an external
reference must be applied to these points.
VOSADJ: DAC offset adjust input, use only if VOSA jumper
set to EXT. Nominal input range is ±5V, which will provide
±2048LSB of offset adjustment.
GEADJ: Gain Adjust Pin. This voltage control pin can be
used to null gain error or to compensate for reference
SPAN
errors. The gain error change expressed in LSB is the
0V to 5V
same for any output range. Nominal range is ±5V, which
0V to 10V
will provide ±2048LSB of gain adjustment.
±5V
±10V
Power and Ground Connections
±2.5V
Analog Power: AMPV
are the analog supplies for the onboard DAC amplifiers.
These should be connected to a well regulated, low noise
±15V power supply.
V : Connection to V
CC
for V jumper.
CC
Grounding: Separate power and signal grounds are pro-
vided. Signal GND is the turret closest to V
for measurement ground and output return. Power GND
is between AMPV
supply. Set to 5V for sup-
CC
+ –
, AMPV , and GND turret posts
. See schematic and description
CC
+ –
and AMPV turrets.
, use this
OUT
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