Analog Features; A/D Converter Inputs - Rabbit RabbitCore RCM3400 User Manual

B.4.3 Analog Features
The Prototyping Board has typical support circuitry installed to complement the ADS7870
A/D converter on the RCM3400 module.
B.4.3.1 A/D Converter Inputs
Figure B-6 shows a pair of A/D converter input circuits. The resistors form an approx.
10:1 attenuator, and the capacitor filters noise pulses from the A/D converter input.
+ V
The A/D converter chip can make either single-ended or differential measurements
depending on the value of the
A/D converter inputs are paired to make differential measurements. The default setup on
the Prototyping Board is to measure only positive voltages for the ranges listed in Table B-3.
Table B-3. Positive A/D Converter Input Voltage Ranges
Min. Voltage
(V)
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
80
178 kW
ADC_IN0
ADC_IN1
178 kW
1 nF 1 nF
AGND
Figure B-6. A/D Converter Inputs
parameter in the software function call. Adjacent
opmode
Max. Voltage
(V)
+20.0
+10.0
+5.0
+4.0
+2.5
+2.0
+1.25
+1.0
ADC
JP1
0 W
Amplifier
mV per Tick
Gain
1
2
4
5
8
10
16
20
BVREF =
2.048 V
10
5
2.5
2.0
1.25
1.0
0.625
0.500
RabbitCore RCM3400