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2-Channel-Interpolation Circuit with Nonius Calculation GC-NIP

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Interpolation rates 32 to 8192 Output signals: ABZ, SPI, SSI, BiSS
Input frequency up to 130 kHz EEPROM, Reference point adjustment, counter-preset
Nominal amplitude 75 mVpp … 1000 mVpp Operating voltage 3,3 V / 5 V (with level shifter GC-LS)
Adjustable low pass filter at input 10 kHz … 150 kHz Package QFN64(9 mm x 9 mm)
Constant delay max. 8µs bei 26 MHz Taktfrequenz
Temperature range: -40°C … +125 °C
Integrierted patented control algorithm


The input signals are subjected to an AMAC-specific internal gain and offset control and the signal period is divided up to 8192 times. For the absolute position of a two-channel nonius system, a resolution of up to 22 bit can be achieved.

Input and output of the GC-NIP are designed for 3.3V interfaces. The IC comprises six instrumentation amplifiers with adjustable gain factors. Encoders with voltage interface or measuring brigdes can be connected directly. Sensors with current interface and photodiode-arrays are adapted by a simple external circuit. The IC operates on both single-ended or differential input signals. The noise of the sensor signals is prevented by a switching analog filter. Additionally, a digital hysteresis can suppress the edge noise of the output signals at low input frequencies and at standstill.

The quality of the signals issued by the sensors is monitored in the IC. For that purpose it is possible to activate 9 sources separately producing an error signal. For the calculation of the absolute position a set of sensor- or scale-specific correction coefficients can be placed in the EEPROM of the IC. In that way, harmonics of the sinusoidal signals or inaccuracies of the measuring scale do not lead to errors in the absolute position value. The determination of the correction coefficients is realized by a simple software-based calibration procedure.

Providing absolute position and incremental square-wave-signals (ABZ) in parallel, the GC-NIP is well-suited for the use in motor-feedback-systems. The four integrated output interfaces (ABZ/SPI/SSI/BiSS) and further features like the multi-stage trigger signal processing, the processing of distance coded reference marks, the possibility to adjust the reference mark as well as adjustment and storage of the zero position make the IC suitable for direct use in industrial controls or in fast absolute or multi-channel incremental position measuring systems. The GC-NIP can be configured according to specific applications using the integrated EEPROM, via configuration inputs or via the serial interface (SPI/BiSS).


Technical Data


Analog input
Sinusoidal/ cosinusoidal / reference (index) signals, differential oder single-ended;
Adjustable amplification for 660 mVPP/250 mVPP /120  mVPP /60 mVPP
Input frequency max. 130 kHz for all Resolutions
ABZ 90° square-wave sequences (A/B/Z)
Adjustable width of zero signal Z to ¼ or 1 period A/B
Service signale for sensor adjustment
SPI 30-bit counter value / 9-bit sensor state
Up to 15 MHz, compatible to standard-SPI 16Bit
Up to 500.000 measurement values per second
Signal filtering for suppression of disturbances
SSI 30-bit counter value / 2-bit sensor state
Gray code / binary code
Adjustable timing, SSI ring operation













 Interpolation/Signal Processing

Interpolation rate Nonius calculation: 256 ... 8192
Interpolation (ABZ): 32 ... 8192
Signal correction
AMAC-specific digital controller for the offset, control range ±10 % of the standard amplitude
AMAC-specific digital controller for the amplitude, control range 60%...120% of the standard amplitude
Digital potentiometer with 64 steps for phase correction; selectable range ±5° or ±10°
Suppresion of disturbances
Selectable low pass filter 10 kHz, 75 kHz, 150 kHz, disabled
Digital hysteresis for suppression of the edge noise at the output (configurable 0 … 7)
Selectable minimum edge distance at the output
Reference mark adjustment Selectable reference mark position
Definition of the optimum reference position via SPI or service signals
Processing of distance coded reference marks
Measured-value trigger at the reference mark position
Miscellaneous 2-stage measured value trigger
Preset signal for adjustment and storage of the zero position of the sensor
Integrated EEPROM for configuration


Important Characteristics

Package QFN64 (9 x 9 mm) 
Operating voltage 3,3 V / 5V-operations with Levelshifter GC-LS possible
Temperaturbereich  -40 … +125 °C



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Ordering Informationen

Product Type Description Article Number
GC-NIP Nonius Interpolation Circuit GC-NIP, QFN64 PR-44800-00
GC-NIP Demoboard for Nonius-IC GC-NIP PR-44810-00
GC-LS 4-channel / analog Level-Shifter 5 V to 3,3 V, QFN32
USB to SPI Adapter USB-Adapter to SPI-Interface PR-44500-00
USB to Biss Adapter USB-Adapter to BiSS-Interface PR-44030-00