Working in industrial applications for optical and magnetic linear scales and rotary encoders, iC-Haus’ iC-TW4 sine-to-digital converter device evaluates magnetic or optical linear and angle sensors. Two setup pins determine the chip function, the signal gain, and the rate of interpolation within a range of x2 to x6; and the sine/cosine sensor signal can be divided up into 256 angle steps and output as an encoder quadrature signal via the RS422 drivers. The 4 mm² QFN-packaged component combines signal gain, conditioning, A/D conversion, serial line drivers, and automatic offset compensation. A static network of resistors, consisting of two resistors apiece, defines the factor of interpolation, the converter hysteresis, and the input voltage range. The front-end instrumentation amplifiers permit both referenced and differential input signals from 10 mVpp to 1.5 Vpp, and the angle position is output via encoder quadrature signals with A, B, and AND-gated zero signals via differential RS422 line drivers.
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