4-5
Figure 4-5. 4 to 20 mA Current Output (Grounded Load)
Using an AC Reference (Digital Attenuator)
In addition to its uses as a standard DC output DAC, the DAC-02 can be
used with a bipolar or AC reference signal. Figure 4-6 shows the
equivalent circuit for the board when used in this mode.
Figure 4-6. DAC-02 Equivalent Circuit when Using an AC Reference
R
L
DAC-02
LL GND
Floating
Supply
4 to 20 mA
+
−
+
−
Unipolar
Output
+
−
V
REF
R
R
R
2R
2R
2R
S1
S2
S3
S12
2R
2R
2R
2R
R
R
Bipolar
Output
Data Latches and Switch Drivers
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