iC-MQ
PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev D4, Page 23/39
Signal Conditioning Examples
1. Photodiode array connected to current inputs, LED supply with constant current source
Step
1.
Operating Mode
Calibration and Signal
Presets
VOS12= 0x3, GF1= 0x40, VDC1= 0x20, OF1= 0x0, GF2= 0x10, VDC2= 0x20, OF2= 0x0
Example: LED current approx. 6.25 mA
ADJ(8)= 1 (constant current source), ADJ(6:5)= 11 (range 50 mA), ADJ(4:0)= 0x04 (value 12.5)
2.
Calibration 2
Calibration of Channel 1:
Parameter GR12: Adjust diff. signal at PA vs. NA to approx. 1 Vpp amplitude
Parameter GF1: Adjust diff. signal at PA vs. NA to exactly 1 Vpp amplitude
Parameter VDC1: Minimization of VDC1 AC fraction at output PZ (ripple < 10 mVpeak)
Parameter OR1, OF1: Calibration of DC fraction to zero for diff. signal PA vs. NA (< 5 mVdc)
Calibration of Channel 2:
Parameter GF2: Adjust diff. signal at PB vs. NB to exactly 1 Vpp amplitude
Parameter VDC2: Minimization of VDC2 AC fraction at ouput NZ (ripple < 10 mVpeak)
Parameter OR2, OF2: Calibration of DC fraction to zero for diff. signal PB vs. NB (< 5 mVdc)
1. Iteration, Calibration of Channel 1 vs. Channel 2:
Parameter OF1: Adjust duty ratio of A
4
at PA to 50 %
Parameter OF2: Adjust duty ratio of B
4
at PB to 50 %
Parameter PH12: Adjust duty ratio of A
8
at NA to 50 %
Parameter GF1: Adjust duty ratio of B
8
at NB to 50 %
Repeated Adjustment of Intermediate Voltages, VDC1 and VDC2:
Parameter VDC1: Minimization of VDC1 AC fraction at ouput PZ
Parameter VDC2: Minimization of VDC2 AC fraction at ouput NZ
2. Iteration, Calibration of Channel 1 vs. Channel 2:
Parameter OF1: Adjust duty ratio of A
4
at PA to 50 %
Parameter OF2: Adjust duty ratio of B
4
at PB to 50 %
Parameter PH12: Adjust duty ratio of A
8
at NA to 50 %
Parameter GF1: Adjust duty ratio of B
8
at NB to 50 %
3.
Calibration 2
4.
System Test
5.
Calibration 2
6.
System Test
Table 31: Conditioning example 1
2. Encoder supplying 100 mVpp to voltage inputs
Step
1.
2.
Operating Mode
Calibration and Signal
Presets
VOS12= 0x1, GF1= 0x40, OF1= 0x0, GF2= 0x10, OF2= 0x0
Calibration 2
Calibration of Channel 1:
Parameter GR12: Adjust diff. signal at PA vs. NA to approx. 1 Vpp amplitude
Parameter GF1: Adjust diff. signal at PA vs. NA to exactly 1 Vpp amplitude
Parameter OR1, OF1: Calibration of DC fraction to zero for diff. signal PA vs. NA (< 5 mVdc)
Calibration of Channel 2:
Parameter GF2: Adjust diff. signal at PB vs. NB to exactly 1 Vpp amplitude
Parameter OR2, OF2: Calibration of DC fraction to zero for diff. signal PB vs. NB (< 5 mVdc)
Calibration of Channel 1 vs. Channel 2:
Parameter OF1: Adjust duty ratio of A
4
at PA to 50 %
Parameter OF2: Adjust duty ratio of B
4
at PB to 50 %
Parameter PH12: Adjust duty ratio of A
8
at NA to 50 %
Parameter GF1: Adjust duty ratio of B
8
at NB to 50 %
3.
Calibration 2
4.
System Test
Table 32: Conditioning example 2
ICHAUS [ IC-HAUS GMBH ]
