iC-MQ PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev D4, Page 24/39
SIGNAL CONDITIONING CH0
The voltage signals needed to calibrate the zero chan- Offset Calibration CH0
nel are available in mode Calibration 1. The relative To calibrate the offset the reference source must first
phase position of the ungated zero signal Zin com- be selected using VOS0 (see Offset Calibration CH1
pared to A and B can be determined in mode System and CH2 for further information). For the CH0 path the
Test.
dependent source VDC is identical to source VDC1.
Gain Settings CH0
VOS0
Code
0x0
Adr 0x13, bit 5:4
Source
Parallel to the conditioning process for the CH1 and
CH2 signals the CH0 gain is also set in the following
steps:
0.05 · V(ACO)
0.5 V
0x1
0x2
0.25 V
1. The sensor supply controller is shut down and the
constant current source for the ACO output set to the
same output current as in the calibration of CH1 and
CH2 (register ADJ; current value close to the later op-
erating point).
0x3
VDC (i.e. VDC1)
Table 35: Offset Reference Source CH0
OR0
Code
0x0
Adr 0x12, bit 1:0
Range
x1
2. The coarse gain is selected so that a differential sig-
nal amplitude of ca. 1 Vpp is produced internally (sig-
nal PCHi versus NCHi).
0x1
x2
0x2
x6
0x3
x12
3. GF0 then permits fine gain adjustment to 1 Vpp. The
total gain is accrued from GR0 x GF0.
Table 36: Offset Range CH0
GR0
Code
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
Adr 0x11, bit 2:0
OF0
Code
0x00
0x01
...
Adr 0x12, bit 7:2
Range RIN0 = 0x9
Range RIN0 = 0x9
Factor
Code
0x20
0x21
...
Factor
0.5
1.0
1.3
1.7
2.2
2.6
3.3
4.0
2.0
0
0
4.1
0.0322
-0.0322
-0.0322 · OF0
-1
5.3
0.0322 · OF0
1
6.7
0x1F
0x3F
8.7
10.5
13.2
16.0
Table 37: Offset Factor CH0
Table 33: Gain Range CH0
GF0
Code
0x00
0x01
...
Adr 0x11, bit 7:3
Factor
1.00
1.06
6.25GF0
31
0x1F
6.25
Table 34: Fine Gain Factor CH0
ICHAUS [ IC-HAUS GMBH ]
