BL4S200 User’s Manual
41
In the differential mode, each individual channel is limited to half the total voltage—for
example, the range for a gain code of 1 is ±20 V, but each channel is limited to ±10 V.
The A/D converter inputs are factory-calibrated, and the calibration constants are stored in
the user block.
When you start to develop your application, run
USERBLOCK_READ_WRITE.C
in the
SAMPLES\UserBlock
folder to save the factory calibration constants in case you inad-
vertently write over them while running the sample programs.
Table 8. A/D Converter Input Voltage Ranges
Amplifier
Gain
Voltage Range
Single-Ended
Unipolar
Single-Ended
Bipolar
Differential
Bipolar
1
0–20 V
±10 V
± 20 V
2
0–10 V
±5 V
± 10 V
4
0–5 V
±2.5 V
± 5 V
5
0–4 V
±2 V
± 4 V
8
*
0–2.5 V
±1.25 V
± 2.5 V
10
0–2 V
±1 V
± 2 V
16
0–1.25 V
±0.625 V
± 1.25 V
20
0–1 V
±0.5 V
± 1 V
* 4–20 mA operation is available with an amplifier gain of 8
When using channels AIN0–AIN3 for current
measurements, remember to set the corre-
sponding jumper(s) on header JP4. The current
measurements are realized by actually measur-
ing the voltage drop across a 100
resistor.
You may substitute a different resistor value as
shown in Figure 16.
Figure 16. Analog Current Measurements
CAUTION:
If you are using a supply voltage of +10 V DC for the 4–20 mA current
measurements, do not exceed 500
for these resistors.
100
W
JP4
AIN0
AIN1
AIN2
AIN3
Example of
adding your
own resistor
Do not jumper
JP4 in this case
Apply jumpers
for factory-default
current measurements
