IC-MQF_15 Datasheet, PDF (23/38 Pages) IC-Haus GmbH – Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MQF PROGRAMMABLE 12-BIT ^preliminary
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
SIGNAL CONDITIONING CH1, CH2
Rev C1, Page 23/38
It is recommended to use operating mode Test 5 for the
calibration of the sine signals. The sine signals are also
available in operating mode Calibration 2 for reasons of
compatibility to iC-MQF, but the amplitudes are smaller
(approx. 50% with respect to operating mode Test 5).
Alternatively, characteristic digital test signals are avail-
able for offset, amplitude and phase conditioning in
operating mode System Test.
Gain Settings
The gain is set in four steps:
1. The sensor supply controller is shut down and the
constant current source for the ACO output is set to
a suitable output current (register ACOT = 0x2, ACOR
and ACOS values close to the later operating point).
2. The coarse gain GR12 is selected so that differential
signal amplitudes of ca. 6 Vpp are produced in opera-
tion mode Test 5 (signal PSIN versus NSIN and PCOS
versus NCOS).
3. Using fine gain factor GF2 the cosine signal ampli-
tude is then adjusted to exactly 6 Vpp.
4. The sine signal amplitude can then be adjusted to
the cosine signal amplitude via fine gain factor GF1.
This results in a total gain of GR12 * GFi for differential
input signals.
1.5
1.5
6
GR12
Code
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
Notes
Adr 0x0a, bit 2:0
Range R12=0x9
Range R12̸=0x9
3.0
12.0
6.0
24.6
7.8
31.8
10.2
40.2
13.2
52.2
15.6
63.0
19.8
79.2
24.0
96.0
Valid for all operation modes except for
Calibration 2 (reduces gain to 1/6).
Table 19: Gain Range CH1, CH2 (coarse)
GF2
Code
0x00
0x01
...
0x1F
Adr 0x0c, bit 4:0
Factor
1.00
1.06
GF2
6.25 31
6.25
Table 20: Fine Gain Factor CH2
GF1
Code
0x000
0x001
...
0x7FF
Adr 0x0b, bit 6:0, Adr 0x0a, bit 7:4
Factor
1.0
1.0009
GF1
6.25 1984
6.6245
Table 21: Fine Gain Factor CH1
iC-MQF
Test 5
Px
VPx
Nx
VNx
GND
R0
VPNx
Figure 7: Definition of 6 Vpp signal. Termination R0
must be high-ohmic during all Test and
Calibration modes.