OT-301SL General Description
The OT-301SL printed circuit board amplifier is designed for direct integration into OEM instrumentation. Optimized for single-axis Position Sensing Detectors (PSDs) with selectable bias voltages and three gain ranges, the OT-301SL’s circuit elements add, subtract and divide signals with exceptional accuracy.
Precision op amps and resistor networks perform addition and subtraction operations; optimized analog dividers provide the final ratio. The analog divider ensures the utmost in linearity over a very wide signal range.
Features
-
Analog Position Output Voltage
-
Sum Output
-
Wide Dynamic Range – Three Decades 103V/A, 104V/A, 105V/A
-
DC to 15kHz
-
Calibration Adjust
-
Zero Offset Adjust
-
Automatic Detector Bias
-
Position Independent of Beam Intensity
The final stages provide ±10% reading adjustment of the position output and serve as a high performance output buffer for driving long cables. The sum signal equals the total detector signal and is proportional to the incident beam power.
The OT-301SL includes a DC-DC converter that can be removed and replaced with an external power source for reducing cost in high-volume OEM applications.
Beam position is calculated from the ratios of signals generated by the PSD’s two anode connections (designated Y1 and Y2). Dual transimpedance amplifiers on the OT-301SL accurately measure the PSD’s anode signal currents. The exact relationship between PSD signal and beam position is as follows: the total detector signal and is proportional to the incident beam power.
where Y is the coordinate of the centroid of the beam spot on the PSD surface (measured from the detector center); and L is the size of the detector’s sensitive surface in mm (e.g.: 2.5, 5.0, 10, 20, 30 mm).
Specifications
Detector Type Single Axis Position Sensing Detectors
Anode Outputs (Common Cathode)
Cathode Outputs (Common Anode)
Bi-Cell (Common Anode or Cathode)
|
Input Sensitivity |
-3 |
-4 |
-5 |
|
10 A/V |
10 A/V |
10 A/V |
Y Output Signal 0V to ± 10V
Sum Output Signal 10V max
Calibration Adjust ± 10% of reading
Y Zero (offset) ± 1.0V
Bias Voltage 0V, ± 5V, or ± 12V
Linearity ± 0.1%
Chanel to chanel tracking 1%
Power AC Adapter ± 12V DC @ 500mA
Size 3.5 x 5.0 inches
Input Connector Receptacle DB9
Output/Power Connector Dual Row 10 PIN Header
Amplifier Gain
|
6 Position DIP Switch |
Gain |
|
ON = 1,4 |
10-3 A/V |
|
ON = 2,5 |
10-4 A/V |
|
ON = 3,6 |
10-5 A/V |
PSD INPUT CABLE
|
PIN# |
FUNCTION |
|
1 |
Y1 PSD Anode |
|
2 |
Y2 PSD Anode |
|
3 |
N/C |
|
4 |
N/C |
|
5 |
GND |
|
6 |
NC |
|
7 |
NC |
|
8 |
PSD BIAS |
|
9 |
GND |
POSITION OUTPUT/POWER INPUT
|
PIN# |
FUNCTION |
|
1 |
Y pos |
|
2 |
GND |
|
3 |
SUM |
|
4 |
GND |
|
5 |
N/C |
|
6 |
GND |
|
7 |
+12V |
|
8 |
GND |
|
9 |
-12V |
|
10 |
GND |
