Datasheet

DAC714
7
SBAS032A
www.ti.com
FIGURE 1. DAC714 Block Diagram.
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%.
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).
Shift Register
DAC Latch
14 12
+10V
Reference
8 6
7
DCOM
+V
CC
ACOM
V
REF OUT
Gain Adjust
4SDI
5SDO
16
2A
0
3A
1
1
16
CLK
CLR
15
– V
CC
Offset
Adjust
13
R
BPO
11
R
FB2
10
9
V
OUT
D/A Switches
–V
CC
+2.5V
15kΩ
180Ω
9750Ω
250Ω
10kΩ
10kΩ
FIGURE 2. Equivalent Circuit of Digital Inputs.
1kΩ
ESD Protection Circuit
6.8V 5pF
Digital
Input
–V
CC
+V
CC
+ Full Scale
All Bits
Logic 0
Range of
Offset Adjust
Offset Adj.
Translates
the Line
Digital Input
All Bits
Logic 1
Analog Output
Full Scale
Range
Gain Adjust
Rotates the Line
– Full Scale
MSB on All
Others Off
Bipolar
Offset
Range of
Gain Adjust
≈ ±0.3%
≈ ±0.3%