Gain Adjust
14
V
REF OUT
12
+V
CC
7
– V
CC
15
180Ω
+10V
Reference
250Ω
10kΩ
9750Ω
10kΩ
10
11
R
FB2
R
BPO
15kΩ
13
Offset
Adjust
+2.5V
–V
CC
D/A Switches
CLK
1
9
DAC Latch
16
Shift Register
V
OUT
A
1
CLR
A
0
SDI
SDO
3
16
2
4
5
8
ACOM
6
DCOM
FIGURE 1. DAC714 Block Diagram.
+V
CC
ESD Protection Circuit
+ Full Scale
Range of
Gain Adjust
≈
±0.3%
Digital
Input
1kΩ
All Bits
Logic 0
Full Scale
Range
Gain Adjust
Rotates the Line
6.8V
–V
CC
5pF
Analog Output
FIGURE 2. Equivalent Circuit of Digital Inputs.
OUTPUT VOLTAGE SWING
The output amplifier of the DAC714 is designed to achieve
a
±10V
output range while operating on
±11.4V
or higher
power supplies.
GAIN AND OFFSET ADJUSTMENTS
Figure 3 illustrates the relationship of offset and gain adjust-
ments for a bipolar connected D/A converter. Offset should
be adjusted first to avoid interaction of adjustments. See
Table I for calibration values and codes. These adjustments
have a minimum range of
±0.3%.
Bipolar
Offset
MSB on All
Others Off
All Bits
Logic 1
Range of
Offset Adjust
Offset Adj.
Translates
the Line
≈
±0.3%
– Full Scale
Digital Input
FIGURE 3. Relationship of Offset and Gain Adjustments.
Offset Adjustment
Apply the digital input code, 8000
H
, that produces the maxi-
mum negative output voltage and adjust the offset potentiometer
or the offset adjust D/A converter for –10V (or 0V unipolar).
DAC714
SBAS032A
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7
TI [ TEXAS INSTRUMENTS ]
