iC-TW8
16-BIT SIN/COS INTERPOLATOR
WITH AUTO-CALIBRATION
iC-TW8 is a general-purpose, 16-bit interpolation device for
sine/cosine signals featuring automatic signal conditioning. The
angular position is calculated at a constant latency of just 24 μs
and can be tracked by an optional second-order servo loop that
provides lag retrieval.
The automatic signal conditioning unit includes offset compen-
sation, amplitude correction, and phase correction. Additionally,
an LUT can be used to correct the digitized phase angle
depending on the sensor’s harmonic signal distortion.
Features
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Input frequency of up to 125 kHz
Differential sine/cosine input signal range of 20 mV to
1.4 V peak-peak
Fractional interpolation factor edged per period of
[8 ... 65536] / [1 ... 32]
Simple automatic one-pin calibration
Easy configuration: by static pins (for generic ABZ output)
Advanced configuration: 1-wire interface, 3 and 4-wire SPI
(32 MHz), EEPROM (SPI or I
²
C)
PWM or ABZ quadrature encoder output signals
Incremental ABZ output to 8 MHz (32 MHz edge
separation)
Position and velocity read-out (32 bit SPI)
Sophisticated error handling and signal monitoring
Static 64 position LUT to compensate for arbitrary sensor
distortions
Supply voltage range of 3.1 V to 5.5 V
Extended temperature range of -40 °C to +125 °C
Applications
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Sine/cosine interpolation
Signal conditioning with auto calibration
Linear and rotary encoders
Flexible incremental encoder systems
48-pin QFN package
7 mm x 7 mm
Am Kuemmerling 18 • D-55294 Bodenheim, Germany
Tel. +49 61 35 / 92 92-30 0 • Fax +49 61 35 / 92 92-19 2 • http://www.ichaus.com
ICHAUS [ IC-HAUS GMBH ]
