Datasheet

LOAD CONNECTIONS
R
1
Sense
Output
R
L
R
2
R
3
AlternateGround
SenseConnection
SystemGround
ACOMDCOM
Bus
Interface
DAC712
Analog
Power
Supply
0.01 Fm
(1)
0.01 Fm
To+V
CC
To V-
CC
V
OUT
10kW10kW
V
REF
DAC712
www.ti.com ................................................................................................................................................. SBAS023A – SEPTEMBER 2000 – REVISED JULY 2009
In some applications it is impractical to return the load
to the ACOM pin of the D/A converter. Sensing the
Because the reference point for V
OUT
and V
REF OUT
is
output voltage at the SYSTEM GROUND point is
the ACOM pin, it is important to connect the D/A
reasonable, because there is no change in the
converter load directly to the ACOM pin; see
DAC712 ACOM current, provided that R
3
is a
Figure 12 .
low-resistance ground plane or conductor. In this
case, DCOM may be connected to SYSTEM
Lead and contact resistances are represented by R
1
GROUND as well.
through R
3
. As long as the load resistance R
L
is
constant, R
1
simply introduces a gain error and can
be removed by gain adjustment of the D/A converter
or system-wide gain calibration. R
2
is part of R
L
if the
output voltage is sensed at ACOM.
(1) Locate close to the DAC712 package.
Figure 12. System Ground Considerations for High-Resolution D/A Converters
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