IP200 ETC [List of Unclassifed Manufacturers], IP200 Datasheet - Page 5

• Manufacturer Part Number: IP200
• Description: Interpolation Circuit for Incremental Measuring Systems
• Manufacturer: ETC [List of Unclassifed Manufacturers]

2
The two input signals for the interpolation function are analogue voltages (sine/cosine) with a sine-shaped
dependency on the measured value (position or angle respectively) with a phase shift of 90° between these
two analogue voltages, related to one period of the scale. A third input signal serves as a reference signal for
determining the zero or reference point of the scale. All the three input signals are processed as differential
signals.
2.1
1)
2.2
The input signals are subject to a automatic gain and offset control patented by GEMAC. The amplitude
controller is specified for a control range of 20% of nominal input voltage. The offset of the external signals
must not exceed a value of 10% of nominal input voltage. The phase shift of the input signals can be
statically adjusted by a external analogue potentiometer in a range of 10° (also refer to Application Notes
4300x-AN-3-0-E-IPx.pdf).
A Chip Reset results in setting the gain-offset-controller to midscale. For achieving the best interpolation
performance, the gain-offset-controller needs approximately 20 signal periods for reaching a steady state.
Until this time, the input signal frequency must not exceed 50% of the specified maximum signal frequency
(refer to chapter 4.4).
All signal errors figures as a union in the IP200. In some special cases means decreasing of one signal error
result in a wider permissible range of another signal error. For achieving the highest performance of the
automatic gain-offset-controller, it is recommended to carefully adjust the phase shift on the connected
sensor itself. This is important especially for high interpolation rates.
Differential Analogue Input Voltage
Analogue Input Voltage V
Input Range for V
Maximum Signal Offset Error
Sine/Cosine Phase Shift
on pins
D-09116 Chemnitz, Germany
Input Signals
Zwickauer Straße 227
Analogue Signal Properties
Signal Correction
Figure 2
GEMAC
Gesellschaft für
Mikroe lektronikanwendung Chemnitz mbH
SINP, SINN, COSP, COSN
SinP
SinN
Angle 0°
Diff
Difference Signal Sin = SinP-SinN
CosP
Diff
CosN
90° Phase Shift
(nominal)
Phone:
Fax::
Internet:
Email:
Date: 20.04.04
1)
Difference Signal Cos = CosP-CosN
[phone] - 0
[phone]
www.gemac-chemnitz.de
[e-mail]
[e-mail]
V
diff
Page 5 of 30
Peak to Peak
V
di ff
Peak to Peak
500mV
1V
0.8V
100mV
90° (adjustable 10°)
pp
pp
Title:
Data Sheet GC-IP200
Name of Document:
43500-DB-2-1-E-IP200.pdf
... 1.2V
pp
pp