IC-PI datasheet(44/49 Pages) ICHAUS

44 / 49 page

preliminary

iC-PI PROGRAMMABLE 12-BIT

Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

Rev B1, Page 44/48

Signal Conditioning Example 1:

Photodiode array connected to current inputs, LED supply with constant current source

Step

Operating Mode

Calibration and Signal

Presets

VOS12= 0x3, GF1= 0x400, VDC1= 0x200, OF1= 0x0, GF2= 0x10, VDC2= 0x200, OF2= 0x0

Example: LED current approx. 6.25 mA

ACOT(1:0)= 0x2 (constant current source), ACOR(1:0)= 0x3 (range 50 mA), ACOS(4:0)= 0x04

(value 12.5)

Calibration of Channel 1:

Test 5

Parameter GR12: Adjust the diff. signal at PA to NA to approx. 6 Vpp amplitude

Test 5

Parameter GF1: Adjust the diff. signal at PA to NA to exactly 6 Vpp amplitude

Calibration 2

Parameter VDC1: Minimize the AC component of VDC1 at PZ (ripple < 10 mVpeak)

Test 5

Parameter OR1, OF1: Minimize the DC component of the diff. signal PA to NA (< 5 mVdc)

Test 5

Calibration of Channel 2:

Test 5

Parameter GF2: Adjust the diff. signal at PB to NB to exactly 6 Vpp amplitude

Calibration 2

Parameter VDC2: Minimize the AC component of VDC2 at NZ (ripple < 10 mVpeak)

Test 5

Parameter OR2, OF2: Minimize the DC component of the diff. signal PB to NB (< 5 mVdc)

System Test

1st Iteration, Calibration of Channel 1 to Channel 2:

duty cycle

Parameter OF1: Adjust duty ratio of A4 at PA to 50 %

Parameter OF2: Adjust duty ratio of B4 at PB to 50 %

Parameter PH12: Adjust duty ratio of A8 at NA to 50 %

Parameter GF1: Adjust duty ratio of B8 at NB to 50 %

Calibration 2

Repeated Adjustment of VDC Offset References, VDC1 and VDC2:

Parameter VDC1: Minimize the AC component of VDC1 at PZ

Parameter VDC2: Minimize the AC component of VDC2 at NZ

System Test

2nd Iteration, Calibration of Channel 1 to Channel 2:

duty cycle

Parameter OF1: Adjust duty ratio of A4 at PA to 50 %

Parameter OF2: Adjust duty ratio of B4 at PB to 50 %

Parameter PH12: Adjust duty ratio of A8 at NA to 50 %

Parameter GF1: Adjust duty ratio of B8 at NB to 50 %

Table 71: Conditioning example 1

Signal Conditioning Example 2:

Encoder supplying 100 mVpp to voltage inputs

Step

Operating Mode

Calibration and Signal

Presets

VOS12= 0x1, GF1= 0x400, OF1= 0x0, GF2= 0x10, OF2= 0x0

Calibration of Channel 1:

Test 5

Parameter GR12: Adjust the diff. signal at PA to NA to approx. 6 Vpp amplitude

Test 5

Parameter GF1: Adjust the diff. signal at PA to NA to exactly 6 Vpp amplitude

Test 5

Parameter OR1, OF1: Minimize the DC component of the diff. signal PA to NA (< 5 mVdc)

Test 5

Calibration of Channel 2:

Test 5

Parameter GF2: Adjust the diff. signal at PB to NB to exactly 6 Vpp amplitude

Test 5

Parameter OR2, OF2: Minimize the DC component of the diff. signal PB to NB (< 5 mVdc)

System Test

Calibration of Channel 1 vs. Channel 2:

duty cycle

Parameter OF1: Adjust duty ratio of A4 at PA to 50 %

Parameter OF2: Adjust duty ratio of B4 at PB to 50 %

Parameter PH12: Adjust duty ratio of A8 at NA to 50 %

Parameter GF1: Adjust duty ratio of B8 at NB to 50 %

Table 72: Conditioning example 2

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