User`s manual

52 RabbitCore 2000
D.5 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 second inverting op-amp. All lows produce 0 V out, FF produces 10 V
out. The output can be scaled by changing 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-6. Sample D/A Converter Connections
+
–
+
–
649 kΩ
324 kΩ
162 kΩ
80.6 kΩ
40.2 kΩ
20 kΩ
10 kΩ
5.11 kΩ
CT0CT7
PA0PA7
HC374
47 kΩ
47 kΩ
CLK
E
+5 V
+5 V
PE2PE3
1.19 kΩ
4.99 kΩ
10 kΩ
10 kΩ
5.11 kΩ
22 pF
22 pF
V
o
V+ > 12 V
V < 12 V