iC-NQ
13-bit Sin/D CONVERTER WITH CALIBRATION
Rev D1, Page 22/25
APPLICATION HINTS
Principle Input Circuits
PSIN
+
-
PSIN
NSIN
11ꢀApp
PSIN
+
RS1
25kS
-
-
RS2
25kS
1Vss to 120S
NSIN
+
PSIN
INPUT SIN
VREF
RS
120S
-
case
SENSOR
iC-NQ
NSIN
NSIN
+
INPUT SIN
VREF
Figure 22: Input circuit for current signals of 11 µA.
case
SENSOR
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
+5V
R001
R1
1kS
1kS
PSIN
-
+
PSIN
R2
+
-
R002
1kS
1kS
V-GEN
1Vpp
+
-
R4
1kS
V-GEN
2Vpp
-
-
NSIN
NSIN
+
+
INPUT SIN
INPUT SIN
VREF
VREF
iC-NQ
iC-NQ
Figure 23: Input circuit for single-side voltage or cur-
rent source signals with ground refer-
ence (adaptation via resistors R3, R4).
Figure 24: Simplified input wiring for single-side
voltage signals with ground reference.
R1
+TTL
10kS
RS3
1kS
-TTL or open
PSIN
5kS
+
-
5kS
ꢀ
PSIN
+
+
+SIN
-SIN
GAIN= 10
CS1
ꢀ
220pF
RS1
5kS
R2
120S
-
10kS
RS4
1kS
RS2
5kS
NSIN
+
ꢀ
Ip
In
INPUT SIN
10ꢂApp
10ꢂApp
NSIN
ENCODER
case
CS2
47nF
VREF iC-NQ
+
INPUTꢁSIN
VREF
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.
iCꢀNQ
Figure 25: Input circuit for differential current sink
sensor outputs, eg. using Opto Encoder
iC-WG.
ICHAUS [ IC-HAUS GMBH ]
