User`s manual

User’s Manual Sample Circuits D–5
D.4 D/A Converter
The output will initially be 0 V to -10.05 V after the first inverting op-amp, and 0 V to +10.05 V after the sec-
ond inverting op-amp. All lows produce 0 V out, FF produces 10 V out. The output can be scaled by chang-
ing the feedback resistors on the op-amps. For example, changing 5.11 kΩ to 2.5 kΩ will produce an output
from 0 V to -5 V. Op-amps with a very low input offset voltage are recommended.
Figure D–5: Sample D/A Converter Connections
+
–
+
–
649 kW
324 kW
162 kW
80.6 kW
40.2 kW
20 kW
10 kW
5.11 kW
CT0CT7
PA0PA7
HC374
47 kW
47 kW
CLK
E
+5 V
+5 V
PE2PE4
1.19 kW
4.99 kW
10 kW
10 kW
5.11 kW
22 pF
22 pF
V
o
V+ > 12 V
V < 12 V