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8.2 User Interface
Figure 33 shows the circuit used to condition the analog signal before it goes to the A/D
converter chip. Depending on the model of A/D Converter Card you have, it is designed to
handle analog inputs of 0 V to 10 V, -10 V to +10 V, or 4–20 mA. The two different volt-
age ranges are handled with different gain resistors, R g : 23.7 k ? for the SR9300 and
12.1 k ? for the SR9310. The input shown in Figure 33 is configured differently for the
SR9320, which handles analog inputs of 4–20 mA.
C FB
1 nF
R g
Input
R IN
100 k W
To ADC
VREF
R TOP
10 k W
R BOTTOM
100 nF
Figure 33. Analog Input Amplifier Circuit
The TLC2543 A/D converter chip on the A/D Converter Card uses synchronous Serial Port
B and Timer A5 on the Rabbit 2000 to do the A/D conversions.
Figure 34 shows the complete pinout for the user interface on header J2. Note that pin 1 is
indicated by a small arrow on the ribbon cable connector.
J2
88
AIN0
GND
AIN3
AIN4
GND
GND
AIN8
AIN9
GND
GND
AIN1
AIN2
GND
AIN5
AIN6
AIN7
GND
AIN10
+5 V (ADC)
+2.5 V
Figure 34. A/D Converter Card User Interface Pinout
Smart Star A/D Converter Cards (SR9300)
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