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3.6 A/D Converter Inputs (LP3500 only)
The single 8-channel A/D converter chip used in the LP3500 (the LP3510 does not have
analog capabilities) has a resolution of 12 bits for differential measurements or 11 bits for
single-ended measurements. Four of the channels can be jumpered individually for 4–20 mA
using jumpers across pins on header J3, and all 8 channels can be used over several
software-scaled voltage ranges.
The A/D converter chip has an internal amplifier that works with the resistor divider net-
work on the analog inputs as shown in Figure 16.
+ V
The A/D converter chip can be programmed in software to operate over the voltage ranges
shown in Table 6.
30
AIN0
AIN1
100 W
AGND
Figure 16. Buffered A/D Converter Inputs
Table 6. A/D Converter Input Ranges
Gain Code
Multiplier
0
1
1
2
2
4
3
5
4
8
5
10
6
16
7
20
R
IN
953 kW
ADC
52.3 kW
J3
100 pF
Voltage
Range
0–20 V
0–10 V
0–5 V
0–4 V
0–2.5 V
0–2 V
0–1.25 V
0–1 V
Fox (LP3500)
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