2.5 Analog Inputs
The microprocessor on the Digital I/O Card has four 10-bit A/D converter channels. Each
channel is identical, and can convert a range of voltages between 0 V and Vcc, where Vcc
is the +5 V reference that powers the microprocessor.
These four channels are configured as follows on the Digital I/O Card:
? 2 buffered channels, 0 – 10 V raw input voltage range, single-ended
? 1 buffered channel, 0 – 1 V raw input voltage range, single-ended
? 1 buffered channel, -0.25 – +0.25 V raw input voltage range, differential
AIN[0...1]
100 k W
0?10 V single-ended
100 k W
1 nF
+
?
10 k W
ADC
1 k W
47 k W
0?1 V single-ended
AIN[2]
25.5 k W
+
10 k W
ADC
?
1 k W
102 k W
25.5 k W
1 nF
1 nF
-025 V ? +0.25 V differential
1 M W
10 k W
ADC
AIN[3?]
AIN[3+]
100 k W
100 k W
?
+
1 M W
1 k W
47 k W
1 nF
+2.5 V
Figure 13. Digital I/O Card Analog Inputs
26
RabbitNet Peripheral Cards
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