IC-NQ Datasheet, PDF (22/25 Pages) IC-Haus GmbH – 13-bit Sin/D CONVERTER WITH CALIBRATION

iC-NQ
13-bit Sin/D CONVERTER WITH CALIBRATION
APPLICATION HINTS
Rev D1, Page 22/25
Principle Input Circuits
1Vss to 120S
PSIN
NSIN
RS
120S
SENSOR
case
PSIN
+
-
-
NSIN
+
INPUT SIN
VREF
iC-NQ
Figure 21: Input circuit for voltage signals of 1 Vpp
with no ground reference. When grounds
are not separated the connection NSIN
to VREF must be omitted.
R3
1kS
V-GEN
1Vpp
R1
1kS
-
R2
1kS
+
R4
1kS
PSIN
+
-
-
NSIN
+
INPUT SIN
VREF
iC-NQ
Figure 23: Input circuit for single-side voltage or cur-
rent source signals with ground refer-
ence (adaptation via resistors R3, R4).
R1
10kS
-
+
R2
10kS
PSIN
+
-
Ip
In
10µApp 10µApp
-
NSIN
+
INPUT SIN
VREF
iC-NQ
Figure 25: Input circuit for differential current sink
sensor outputs, eg. using Opto Encoder
iC-WG.
11µApp
PSIN
NSIN
RS1
25kS
RS2
25kS
SENSOR
case
PSIN
+
-
-
NSIN
+
INPUT SIN
VREF
iC-NQ
Figure 22: Input circuit for current signals of 11 µA.
+5V
R001
1kS
R002
1kS
PSIN
+
-
V-GEN
2Vpp
-
NSIN
+
INPUT SIN
VREF
iC-NQ
Figure 24: Simplified input wiring for single-side
voltage signals with ground reference.
+SIN
-SIN
+TTL
-TTL or open
5kS
120S
ENCODER case
RS3
5kS
1kS
RS1
5kS
RS2
5kS
CS1
220pF
RS4
1kS
CS2
47nF
PSIN
+
-
GAIN= 10
-
NSIN
+
INPUT SIN
VREF
iC-NQ
Figure 26: Combined input circuit for 11 µA, 1 Vpp
(with 120 Ω termination) or TTL encoder
signals. RS3/4 and CS1 serve as protec-
tion against ESD and transients.