iC-TW8 16-BIT SIN/COS INTERPOLATOR
Serial Configuration Mode
Jan 9, 2013 Page SC3/36
Functional Overview
The iC-TW8 is a general-purpose 16-bit Sin/Cos
interpolator with sophisticated auto-calibration
functions. It accepts 10 – 700mV differential analog
Sin/Cos input signals from magnetic or optical sen-
sors and calculates (interpolates) the angular posi-
tion. Output is industry-standard incremental AB
quadrature at programmable resolution. Automatic
calibration requires no complicated signal analysis
or calibration procedure during product design or
production. Auto-adaption monitors and adapts pa-
rameter values during operation to maintain optimal
performance and low error and jitter.
In addition to the chosen sensor, the iC-TW8 re-
quires an external EEPROM to store its configura-
tion and calibration data. An external crystal can be
used instead of the internal oscillator of the iC-TW8
for superior frequency stability. A differential line
driver can be connected directly to the iC-TW8
quadrature outputs to make a complete encoder.
COS
SIN
OUTA
OUTB
Interpolation factor of x5 shown
ZERO
OUTZ
Index pulse is suppressed
as ZERO is low.
Figure 1: iC-TW8 Functional Overview
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