IC-MSA Datasheet, PDF (22/29 Pages) IC-Haus GmbH – SIN/COS SIGNAL CONDITIONER with AGC and 1Vpp DRIVER

iC-MSA SIN/COS SIGNAL
preliminary
CONDITIONER with AGC and 1Vpp DRIVER
Rev A1, Page 22/29
Offset Calibration CH1, CH2
In order to calibrate the offset the reference source
must first be selected using VOS12. Two fixed volt-
ages and one dependent source are available for this
purpose.
VOS12
Code
0x0
0x1, 0x2
0x3
Addr 0x4E, bit 5:4
Type of source
Feedback of sensor supply voltage: VDDS
for supply-dependent differential voltage signals
for Wheatstone sensor bridges
Fixed reference: V05 of 500 mV, V025 of 250 mV
for single-ended or differential signals
(regulated sensor or waveform generator)
not permitted
Table 28: Offset Reference Source CH1, CH2
The calibration range for the CH1/CH2 offset is depen-
dent on the selected VOS12 source and is set using
OR1 and OR2. Both sine and cosine signals are then
calibrated using factors OF1 and OF2. The calibration
target is reached when the DC fraction of the differen-
tial signals PCHx versus NCHx is zero.
OR1
OR2
Code
0x0
0x1
0x2
0x3
Addr 0x49, bit 0; Addr 0x48, bit 7
Addr 0x4A, bit 5:4
Range
x1
x2
x6
x12
OF1
OF2
Code
0x000
0x001
...
0x3FF
Addr 0x4A, bit 3:0; Addr 0x49, bit 7:1
Addr 0x4C, bit 0; Addr 0x4B, bit 7:0; Addr 0x4A, bit
7:6
Factor
Code
Factor
0
0x400
0
+ 0.00098
0x401
− 0.00098
+ Code / 1023
...
− (Code - 1024)
/ 1023
+1
0x7FF
−1
Table 30: Offset Factors CH1, CH2
Phase Correction CH1 vs. CH2
The phase shift between CH1 and CH2 can be ad-
justed using parameter PH12. Following phase cal-
ibration other calibration parameters may have to be
adjusted again (those as gain ratio, intermediate po-
tentials and offset voltages).
PH12
Code
0x000
0x001
...
0x1FF
Addr 0x4D, bit 2:0; Addr 0x4C, bit 7:1
Correction angle Code
Correction angle
0°
0x200
0°
+ 0.0204 °
0x201
− 0.0204 °
+ 10.42 ° ·
...
PH12 /511
− 10.42 ° ·
(PH12 - 512) /511
+ 10.42 °
0x3FF
− 10.42 °
Table 31: Phase Correction CH1 vs. CH2
Table 29: Offset Range CH1, CH2