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iC-NQ is a monolithic A/D converter which, by applying a count-safe vector follower principle, converts sine/cosine sensor signals with a selectable resolution and hysteresis into angle position data. This absolute value is output via a high-speed synchronousserial BiSS interface and trails a master clock rate of up to 10 Mbit/s, or, alternatively, can be set so that it is compatible with SSI. A period counter supplements the position data with a multiturn count and can be configured for BiSS single-cycle data output.

At the same time any changes in output data are converted into incremental A QUAD B encoder signals. Here, the minimum transition distance can be adapted to suit the system on hand (cable length, external counter). A synchronised zero index is generated and output to Z if enabled by the PZERO and NZERO inputs.

The front-end amplifiers are configured as instrumentation amplifiers, permitting sensor bridges to be directly connected without the need for external resistors. Various programmable D/A converters are available
for the conditioning of sine/cosine sensor signals with regard to offset, amplitude ratio and phase errors. Front-end gain can be set in stages graded to suit all common differential sensor signals from approximately 20 mVpp to 1.5 Vpp, and also singleended sensor signals from 40 mVpp to 3 Vpp respectively.

Two serial interfaces have been included to permit configuration of the device, connection of an EEPROM or synchronous-serial data transfer (BiSS). Both interfaces are bidirectional and enable the complete
configuration of the device including the transfer of setup and system data to the EEPROM for permanent storage. If the memory is detected following a power-down reset, the chip setup is read in and automatically repeated if a CRC error occurs.