Connection To Adc Input With Up To 16 Differential Voltage Sources - L-Card L-502-P-G-D-I User Manual

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6.1.2. Connection to ADC input with up to 16 differential voltage sources

6.1.2.1. General case
Only for voltage subranges of L-502: ± 2 V, ± 1 V, ± 0.5 V, ± 0.2 V.
6.1.2.2. Differential connection of an
isolated voltage source
The following condition should be met:
(R1 = R2) ≤ 50 Ω, if the switching frequency
is maximal.
Allocate R1, R2 close to
L-502 entry.
Only for voltage subbands:
± 2 V, ± 1 V, ± 0.5 V, ± 0.2 V.
6.1.2.4. Special case: differential connection of the inductive sensor:
L
X1 (X2 -X16)
R1
AGND
L-502
R2
Y1 (Y2 -Y16)
X1 (X2 -X16)
R1
AGND
L-502
R2
Y1 (Y2 -Y16)
X1 (X2-X16)
Uвх
L-502
Y1 (Y2 -Y16)
AGND
6.1.2.3. Differential connection of an
isolated voltage source with divider
R3
R4
It is necessary: R1 ≤ 50 Ω, if the switching
frequency is maximal, R1 = R2, R3 = R4..
Allocate R1, R2 close to L-502 input. The
voltage transfer ratio is
(R1+R2)/(R1+R2+R3+R4)
Only for voltage subbands:
±2 V, ±1 V, ±0.5 V, ±0.2 V
R3
R4
X1 (X2 -X16)
R1
AGND
L-502
R2
Y1 (Y2 -Y16)
X1 (X2 -X16)
R1
AGND
L-502
R2
Y1 (Y2 -Y16)