ASIC- und Mikrosensoranwendung Chemnitz


Interpolation Circuits GC-IP201 and GC-IP201B



Interpolation rate 20 ... 256
Input frequency max. 440kHz
Adjustable input low pass filter 10kHz … 450kHz
Constant delay time of 2.4µs for all resolutions
Patented internal gain and offset control

Output signals: ABZ, SPI, SSI, BiSS (GC-IP201B only)
EEPROM, multiturn counter, reference mark adjustment
Power supply 3.3V / 5V*
Temperature range: -40°C … +150°C

The interpolation circuits GC-IP201 and GC-IP201B serve to increase the resolution of incremental position and angular measuring systems with sinusoidal output signals. The input signals are subjected to a AMAC-patented internal gain and offset control and the signal period will be divided up to 256 times. The ICs comprise three instrument amplifiers with adjustable gain factors. Incremental encoders which possess a voltage interface and measuring bridges can be connected directly. Sensors with current interface and photodiode-arrays are adapted by a simple external circuit. 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 ICs. For that purpose it is possible to activate 9 sources separately producing an error signal. The four integrated output interfaces ABZ, SPI, SSI, BiSS (GC-IP201B only) and further features like the multi-stage trigger signal processing, integrated timer, integrated multiturn counter, 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 of the ICs in industrial controls or in fast multi-channel positioning measuring systems. With these features the ICs are also prepared for use in absolute positioning measuring systems.

Technical Data


Analog input:

Sinusoidal / cosinusoidal / reference (index) signals; differential or single-ended
Adjustable amplification for 660mVPP / 330mVPP / 160mVPP / 50mVPP
(corresponding to 1Vpp …  80mVpp at 5V)
Input frequency max. 440kHz for all resolutions


90° square-wave sequences (A/B/Z)
Adjustable width of zero signal Z to ¼ or 1 period A/B
Service signals for sensor adjustment


30-bit counter value / 16-bit multiturn value / 9-bit sensor state
Up to 25MHz, compatible to standard-SPI 16 bit
Up to 500 000 measurement values per second
Signal filter for suppression of disturbances

SSI and BiSS:

30-bit counter value / 16-bit multiturn value / 2-bit sensor state
Gray code / binary code
Adjustable timing, SSI ring operation

Interpolation / Signal Processing

Interpolation rate:

256, 200, 160, 128, 100,  80, 64, (50), 40, 32, (25), 20

Signal correction:

Patented digital controller for the offset, control range ±10% of the standard amplitude
Patented digital controller for the amplitude, control range 60% … 120% of the standard amplitude
Digital potentiometer with 15 steps for phase correction; selectable range ±5° or ±10°

Suppression of disturbances:

Selectable low pass filter 10kHz, 75kHz, 200kHz, 450kHz
Digital hysteresis for suppression of the edge noise at the output (0 … 7)
Selectable minimum edge distance at the output

Reference mark adjustment:

Selectable reference mark position with 32 steps 0° … 360°
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


2-stage measured value trigger; programmable timer (3.2µs … 420ms)
Zero-signal and teach-signal for adjustment and storage of zero position of the sensor
Multiturn counter
Integrated EEPROM for configuration

Important Characteristics


QFN40 (6mm x 6mm)

Operating Voltage:

3.3V / 5V*

Temperature Range:

-40°C … +150°C

*Configuration of 5V-systems possible via Level-Shifter GC-LS





Ordering Information

Product Type


Item No.


Interpolation circuit GC-IP201, QFN40



Interpolation circuit GC-IP201B incl. BiSS-Interface, QFN40



4-channel / analog Level-Shifter 5V to 3.3V, QFN32



Demoboard for Interpolation circuit GC-IP201 / GC-IP201B