AMAC

ASIC- und Mikrosensoranwendung Chemnitz

 

Interpolation Circuit GC-IP2000

 

Characteristics

                   

Interpolation rate up to 2,048
Input frequency max. 260 kHz for all resolutions
Highest dynamic with highest precision of measurement

Constant delay of 5 µs for all resolutions
Up to 500000 measurement values per second
Patented internal gain and offset control


The interpolation circuit GC-IP2000 serves to increase the resolution for incremental position and angular measuring systems with sinusoidal output signals offset by 90°. The IC divides the signal period up to 2,048 times. The GC-IP2000 comprises 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 IC may operate with both single-ended and 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. Thus, in case of a short-time disturbance of the input signals, a subsequent interpolation counter will operate without errors. The input signals are subjected to a GEMAC-patented internal gain and offset control. The amplitude is controlled in the range between 60 % and 120 % of the nominal amplitude. The control range for the offset of the two input signals is ±10 % of the nominal amplitude. The phase displacement of the input signals can be corrected statically between -10° and +10° using a digital potentiometer. The quality of the signals issued by the sensors is monitored in the IC. For that purpose it is possible to activate separately 9 sources producing an error signal. The propagation delay of the IC is only 5µs. A fast serial interface (SPI) is implemented. This interface operates at a clock frequency of up to 25 MHz and is compatible to all important micro-controller and DSP families. In addition, a timer and a multi-stage trigger are implemented. This features make the GC-IP2000 an ideal choice for use in fast controllers or control systems.


Technical Data




Analog Part









Analog input:


Sinusoidal / cosinusoidal / reference (index) signals
Adjustable amplification for 1 Vpp / 500 mVpp / 250 mVpp / 75 mVpp
Input frequency max. 260 kHz for all resolutions







Digital Part









Interpolation rate :


100 / 128 / 200 / 256 / 400 / 500 / 512 / 800 / 1,000 / 1,024 / 1,600 / 2,000 / 2,048







Output signals:


30-bit counter value via serial interface (SPI)
Up to 500,000 measurement values per second
90° square-wave sequences (A/B/Z)
Error signal, interrupt signal to the µC
Auxiliary signals for sensor adjustment







Signal correction:


Digital controller for the offset, control range +/-10 % of the standard amplitude
Digital controller for the amplitude, control range factor 0.5 ... 1.5
Potentiometer with 40 steps for phase correction; selectable range ±5° or ±10° resp.
LED control signal







Possibilities of configuration:


Either:
Via configuration pins, the serial interface (SPI) or EEPROM







SPI:


Compatible to the standard SPI: 16-bit, MSB first
SPI clock up to 25 MHz
For configuration and measuring value output; not required for trivial systems







Miscellaneous









Supression of disturbances:


Switching analog noise filter
Digital hysteresis for suppression of the edge noise at the output







Adaptation of IC to subsequent devices:


Adjustable minimum edge interval at the output
Behaviour of IC in case of sensor error can be programmed
Adjustable width zero signal Z ¼ or 1 period A/B







Data logging:


2-stage measured-value trigger
Programmable timer
Constant delay between sampling and measurement value of 5 µs for all resolutions







Important Characteristics









Operating voltage:


5 V DC







I/O voltage, digital:


3.3 V DC or 5 V DC







Temperature range:


- 40 °C ... 125 °C







Package









QFN56:


Pitch 0.5mm, 8mm x 8mm package




Download


Infoblatt

Datenblatt

Software







Ordering Information

Product Type

Description

Item No.


GC-IP2000

Interpolation IC GC-IP2000, QFN56

PR-44000-50


GP2000

Evaluationboard of Interpolation IC GC-IP2000

PR-44010-00