IC-MG Datasheet, PDF (12/20 Pages) IC-Haus GmbH – 8-Bit Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MG
preliminary
8-Bit Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
INPUT CONFIGURATIONS
Rev C1, Page 12/20
Figure 1: Input instrumentation amplifier and signal conditioning
All input stages are configured as instrumentation am-
plifiers and thus directly suitable for differential input
signals. Referenced input signals can be processed
as required; in Single-Ended Input Mode the NZERO
input acts as a reference, replacing the input signals
from NSIN and NCOS.
125 mV and 250 mV (verifiable in Calibration Mode 2).
In V Mode an optional voltage divider can be selected
which reduces unacceptably large input amplitudes to
ca. 25%. The circuitry is equivalent to the resistor
chain in I Mode; the pad wiring resistor is considerably
larger here, however.
INMODE
0
1
Note
Adr 0x03, bit 2
Differential input signals
Single-ended input signals *
* Input NZERO is reference for all inputs.
Table 7: Input Signal Mode
Both current and voltage signals can be processed
as input signals, selected by RSC(0) and RZ(0). In I
Mode an input resistor Rin() becomes active at each
input pin, converting the current signal into a voltage
signal. The input resistance Rin() consists of a pad
wiring resistor and resistor Rui() which is linked to the
adjustable bias voltage source VREFin(). The follow-
ing table shows the possible selections, with Rin() giv-
ing the typical resulting input resistance (see Electrical
Characteristics for tolerances).
The input resistor should be set in such a way that
intermediate potentials VDCS and VDCC lie between
RSC
RZ
Code
–000
–010
–100
–110
1—1
0—1
Adr 0x0E, bit 3:0
Adr 0x13, bit 3:0
Nominal Rin() Internal Rui()
1.7 kΩ
1.6 kΩ
2.5 kΩ
2.3 kΩ
3.5 kΩ
3.2 kΩ
4.9 kΩ
4.6 kΩ
20 kΩ
5 kΩ
high
impedance
1 MΩ
I/V Mode
Current input
Current input
Current input
Current input
Voltage input
Voltage input
Table 8: I/V Mode and Input Resistance
BIASSC
BIASZ
Code
0
1
Adr 0x0E, bit 6
Adr 0x13, bit 6
VREFin()
Type of sensor
2.5 V
Lowside current sink (I Mode)
1.5 V
Highside current source (I Mode)
Table 9: Input Bias Voltage