iC-TW4
PROGRAMMABLE INTERPOLATOR
WITH AUTOMATIC OFFSET CORRECTION
Rev D1, Page 1/14
FEATURES
o
Realtime interpolation with selectable factors of
x2, x4, x5, x8, x10, x16, x20, x25, x32, x50, x64
o
Differential signal and index gating inputs
o
Input voltage range of 10 mVpp diff. to 1.5 Vpp diff.
o
Maximum input frequency of 300 kHz (to x8),
150 kHz (x10 to x16), 75 kHz (x20 and up)
o
Selectable hysteresis of 2.8 ° to 15.6 °
o
Averaging filter over 16 samples
o
Latency less than 1 µs
o
Differential encoder quadrature outputs
o
Electronic index signal generation
o
Startup behaviour: ABZ state defined by absolute sensor
position within a period
o
Automatic offset correction for sensor and interpolator circuit
o
Static pin programming with four external resistors
o
Low power consumption from single-ended 3.3 V to 5 V supply
o
Extended temperature range of -40 to +125 °C
APPLICATIONS
o
Optical and magnetic position
sensors
o
Rotary encoders
o
Linear encoders
o
Space constraint embedded
solutions
PACKAGES
QFN24
BLOCK DIAGRAM
PINA
NINA
+
iC-TW4
VDD
B
-
NB
COSINE INPUT / A
A
PINB
NINB
+
-
SIN/D
CONVERSION
NA
SINE INPUT / B
16 x FILTER
AUTOMATIC
OFFSET
COMPENSATION
PINZ
Z
NZ
HYSTERESIS
CFG1
NINZ
ZERO INPUT
SIGNAL PROCESSING
GND
2 PIN-SETUP
ABZ-
GENERATOR
CFG2
Copyright © 2010 iC-Haus
ICHAUS [ IC-HAUS GMBH ]
