A Si avalanche photodiode and low noise preamplifier module. A field effect transistor input stage
ensures low HF noise and wide bandwidth. The bias voltage supply has temperature compensation to
maintain the APD. gain constant.
Preferred detector sizes are dia. 0.5 and 2.5 mm. Alternately a
0.5 mm version with lensed cap magnifies the detector (to
~2 mm for beams converging less than 0.1 N.A.). For other
detector diameters — 0.25 to 5 mm in TO52 case, or 0.8 to
2.5 mm in TO5 case, please ask for details.
The amplifier comes with 1.5 metre supply lead and requires ±15V <100mA.
The gain of an APD is temperature sensitive (around –4%/C at gain of 100). A nominal temperature correction
is applied to the bias voltage to reduce this to less than ±1%/C. Improved correction can be done at extra cost,
or the customer can optimize this himself - e.g. if using a different gain. A procedure for setting gain and
temperature correction back to the original values is described in the handbook (all of this assumes a
competent person using anti-static precautions).
Because APDs use high voltages, there may be self heating if >uW intensities are continuously present. The
bias supply is designed to shut down under these conditions.
ver 061404
5700 Corsa Avenue, #105 • Westlake Village, CA 91362
Tel: (818) 706-3400 • Fax (818) 889-7053
Email: sales@pacific-sensor.com • www.pacific-sensor.com
Gain at 800 nm
Bandwidth
Risetime <10% overshoot
Dark noise (NSD)
DATA SHEET
• D.c. to 25 MHz (10 MHz for large detector).
• Fully DC-coupled with good pulse response.
• Various detector sizes are available.
• 50 Ω output for driving long cables.
• The APD50 is fully DC-coupled with dark offset <1 mV
and good DC stability for detecting low level signals.
Length
80
APD AVALANCHE PHOTODIODE PREAMPLIFIER
Width
56
Specifications (At 22°C into 50 Ω load)
0.5 mm Detector
2.5 x 10
Dimensions
30 fW/√Hz
25 MHz
Height
14 ns
28
6
V/W
APD50
Tel: +49 (0) 30-53510 34 • Fax: +49 (0) 30-53790 262
Overall Length
92
Ostendstr 1, D-12459 Berlin, Germany
Email: pnsilsensuk@btinternet.com
2.5 mm Detector
1.25 x 10
Email: sales@silicon-sensor.de
300 fW/√Hz
15 MHz
23 ns
6
V/W
Weight
150g
United Kingdom
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