IC-MQF Datasheet, PDF (19/37 Pages) IC-Haus GmbH – PROGRAMMABLE 12-BIT Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MQF PROGRAMMABLE 12-BIT ^preliminary
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev A1, Page 19/37
Calibration 1, 2, 3, Test 5
These modes are used to condition the input signals
and calibrate iC-MQF. In mode Calibration 1 the user
can measure the IBN bias current and the zero chan-
nel analog signals are available (PCH0 and NCH0) (for
zero channel calibration see page 25).
In mode Test 5 the conditioned sine and cosine signals
are output (PSIN, NSIN, PCOS and NCOS). In mode
Calibration 2 the conditioned sine and cosine signals
are output with a gain which is reduced by factor 6
(PCH1, NCH1, PCH2 and NCH2). The intermediate
potentials VDC1 and VDC2 are provided on Pin PZ
and Pin NZ if VOS12 is set to 0x3. (For a description
of the calibration process, see page 23).
In mode Calibration 3 the internal temperature moni-
toring signals are provided. Calibration of the bias cur-
rent source and temperature monitoring is described
on page 17.
TEST 6
The input voltages at the pins X3 to X6 can be checked
in mode Test 6. The following settings are required
here:
• MUX = 0x40
System Test and Digital Calibration
This mode enables the signal conditioning to be ad-
justed using comparated sine and cosine signals. At a
resolution of 8 the interpolator generates a switchpoint
every 45 degrees. The objective of the calibration pro-
cedure is a pulse duty cycle of exactly 50% respec-
tively for A₄, B₄ und A₈, B₈.
System Test
Pin Signal
Description
PA A₄
NA A₈
Offset CH1
Phase deviation from 90° between
CH1 and CH2
PB B₄
NB B₈
Offset CH2
Amplitude deviation between
CH1 and CH2
PZ Z_In
NZ TP1
Digital zero signal, unmasked
Verification of line count (pulses) between
two zero pulses
Low signal: verification running (state after
power on reset)
High signal: verification finished
An error messaging at ERR is valid after the
second zero signal (enable required).
The following settings are required for mode System Test:
MODE = 0x0B, SELRES = 0x0002, SELHYS = 0xF,
CFGABZ(7:4) = ’0000’
Table 15: Digital Calibration Signals