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Deva018 Single Axis Sine-Wave Interpolator
User’s Manual
Installation and Usage
2
Installation and Usage
The Deva018 single axis sine-wave interpolator can accept a variety of input signals,
including 11µA or 1Vpp differential sine / cosine signals and produce RS422 differential
square wave quadrature signals. The interpolation factor may be set to 10, 25, 50 or 100
times. For 1Vpp the inputs may be terminated with on board 120ohm resistors. The
maximum input rate is 125kHz and the maximum output count rate is 5MHz using x10
interpolation.
The Deva018 operates from +5V, which may be supplied either from the input or output
connector.
The output connector is pin to pin compatible with all Deva’s encoder
interface and motion
control products. All unused pins are passed through from input to output.
2.1
Connections
The following table lists the input and output connection for the Deva018.
Sine Wave Input
Square-wave output
15-way HD female
Signal
15 -way HD male
Signal
Test Connections
Pin 1
Ain
Pin 1
Aout
Oscilloscope nA
Pin 2
Bin
Pin 2
Bout
Oscilloscope B
Pin 3
nTEST
Pin 3
nTEST
0V
Pin 4
Min
Pin 4
Mout
Pin 5
**
Pin 5
**
Pin 6
nAin
Pin 6
nAout
Oscilloscope A
Pin 7
nBin
Pin 7
nBout
Oscilloscope nB
Pin 8
**
Pin 8
**
Pin 9
nMin
Pin 9
nMout
Pin 10
**
Pin 10
**
Pin 11
*(+12V for Deva023) Pin 11
*(+12V for Deva023) +12V as required
Pin 12
+5V
Pin 12
+5V
+5V
Pin 13
0V
Pin 13
0V
0V
Pin 14
*
Pin 14
*
Pin 15
*
Pin 15
*
* Connected directly from input to output, no internal connection. The Pin 11 pass-through may be used to take
+12V from Deva001, Deva037 or Deva004 via Deva018 to Deva023.
** Connected directly from input to output, +5V pull up present. If used, do not exceed 0V to +5V range.
When connecting single-ended signals it is important to connect the nAin/nBin/nMin signals
to a suitable reference point. For example, if the scale outputs a 2Vpp signal on a 2.5V offset
then the nAin/nBin/nMin inputs should be connected to the 2.5V scale reference voltage.
Important: If to be used with the Deva023 pre-amp, the Deva018 must be configured for
voltage mode and A,B termination must be disabled.
