IC-MQ_15 Datasheet, PDF (36/43 Pages) IC-Haus GmbH – Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MQ PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
APPLICATIONS NOTES: SIGNAL CONDITIONING
Rev F3, Page 36/43
MODE(3:0)
Code
0x00
0x01
0x02
0x0B
Operating Mode
Mode ABZ
Calibration 1
Calibration 2
System Test**
Addr. 0x02; bit 3:0
Pin PA
Pin NA
Pin PB
Pin NB
Pin PZ
Pin NZ
A
not(A)
B
not(B)
Z
not(Z)
TANAZ(2) VREFIZ
VREFISC IBN*
PCH0
NCH0
PCH1
NCH1
PCH2
NCH2
VDC1
VDC2
A₄
A₈
B₄
B₈
Z_In
TP1
*) Outputs must be active and not tristate; see page 16, table 11.
**) Additional parameter settings are required, see page 18, table 15.
Table 63: Used operating modes and test signals.
Pin ERR
ERR
IERR
ERR
Presets
ACO Control OFF
#1
Bias
Calibration 1
#2
Gain
Calibration 2
/ System Test
#3 Reference VDC Calibration 2
#4
Offset
System Test
#5
Phase
(#2) Gain: GF1
(repetition)
(#4) Offset: OF1
(repetition)
Mode ABZ
ACO Control ON
Normal operation
calibration procedure
Figure 15: Principle approach
(shown for channel CH1 and CH2).
Bias Current
CFGIBN 0x8
Connect 10 kΩ
Calibration 1
resistor required between
pins VDDS and NB
VDDS – NB ^no
=2V?
CFGIBN
up / down
yes
#1: bias calibration
Figure 16: Verification of the bias current is recom-
mended, and if necessary adjustment (see
chapter bias current source).
Coarse Gain
GR12
Fine Gain
GF2, GF1
Calibration 2
ca. 250 mVpk
System Test
Pin NB: duty ^no
cycle 50 % ?
Fine Gain
GF1
yes
#2: gain calibration
Figure 17: Adjustment of coarse gain GR12 and fine
gains GF1 and GF2 to obtain the target am-
plitude of 250 mVpeak. Amplitude match-
ing is adjusted by fine gain control GF1 of
channel CH1.
Figure 18: Test signal at pin NB for fine tuning of chan-
nel CH1 for identical amplitudes. The ad-
justment is ideal at a duty ratio of 50%.