OZ2X12 (ISA formfactor)
The OZ2X12 is a 2 channel, 12-bit position interpolator designed to accept conventional analog sine and cosine encoder inputs and interpolate a single encoder cycle into 4096 discrete steps, i.e. 12 bits. Thirty-six bits of integer position, or line count, are also provided. Position compare capability is also available on this model. This feature provides a hardware trigger pulse when the actual position matches a preset compare register. This register can be auto incremented, thus providing autonomous triggering of system components at a fixed positional interval.
The OZ2X12 interfaces directly to encoders with differential outputs. The encoder interface employs automatic gain correction and ratiometric signal conversion, and can therefore tolerate input signal amplitude variation with minimal reduction in performance. This is intended to compensate for normal signal amplitude variation over an encoder’s measurement range. A signal conditioning board (P.N. EA100) is available to adapt encoders with different signal formats to the OZ2X12. The EA100 also provides external encoder power supply connections for special applications.
Mechanically, the OZ2X12 conforms to full length ISA card dimensions. The board may be mounted in a standard ISA bus slot or as a standalone card in the user’s chassis. The ISA bus itself is not used for interface purposes, rather, a separate parallel bus is provided to interface directly with a Delta Tau, PMAC motion control card as a memory mapped peripheral.
| Specifications | |
| Power Supply | 5V ±5% |
| Supply Current | 400mA (max) |
| Analog Encoder Inputs (differential) | 1.2Vpp (max) |
| Encoder Inputs Common Mode Voltage | 2.5V ± 1V (max) |
| Encoder Input Frequency | 400kHz (max) |
| Servo Clock Rate11 | 8kHz (max) 2-axis |
| Servo Delay |