data sheet apd50 apd avalanche photodiode preamplifier 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 m m v e r s i o n w i t h l e n s e d c a p m a g n i f i e s t h e d e t e c t o r ( t o ~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 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 t e m p e r a t u r e c o r r e c t i o n b a c k t o t h e o r i g i n a l v a l u e s i s d e s c r i b e d i n t he h an d b o o k ( a l l o f t h i s a s s u m es 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 page 1 of 3 ostendstr 1, d-12459 berlin, germany tel: +49 (0) 30-53510 34 fax: +49 (0) 30-53790 262 email: sales@silicon-sensor.de united kingdom email: pnsilsensuk@btinternet.com d.c. to 25 mhz (10 mhz for large detector). fully dc-coupled with good pulse response. various detector sizes are available. 50 w 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. dimensions length 80 width 56 height 28 overall length 92 weight 150g the amplifier comes with 1.5 metre supply lead and requires 15v <100ma. specifications (at 22c into 50 w load) gain at 800 nm bandwidth risetime <10% overshoot dark noise (nsd) 0.5 mm detector 2.5 x 10 6 v/w 25 mhz 14 ns 30 fw/?hz 2.5 mm detector 1.25 x 10 6 v/w 15 mhz 23 ns 300 fw/?hz
data sheet apd50 apd avalanche photodiode preamplifier 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 page 3 of 3 ostendstr 1, d-12459 berlin, germany tel: +49 (0) 30-53510 34 fax: +49 (0) 30-53790 262 email: sales@silicon-sensor.de united kingdom email: pnsilsensuk@btinternet.com noise considerations for apd50 case outline drawing for apd50 bnc o / p pow e r apd 80.0 mm 25.4 mm 28.4 mm 53.6 mm 16.0 mm 20.0 mm
data sheet apd50 apd avalanche photodiode preamplifier 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 page 2 of 3 ostendstr 1, d-12459 berlin, germany tel: +49 (0) 30-53510 34 fax: +49 (0) 30-53790 262 email: sales@silicon-sensor.de united kingdom email: pnsilsensuk@btinternet.com noise considerations for apd50 noise considerations for apd50 small - 0.5 detector with ~30 mhz b/w, at 800 nm. large - 2.5 dia detector with ~10 mhz b/w, at 800 nm. the graphs below show how noise performance is affected by apd gain. they are computed curves for guidance only. curves are noise spectral density in w/hz -1/2 (the lower the curve, the better the signal-to-noise ration). lower curves (with circles) are dark noise. upper curves (with boxes) are nsd at full bandwidth. modules normally have gain set to 100 for small and 50 for large detectors. gain adjustments is possible and is explained in the handbook. 10 pw.hz 1/2 1 pw.hz 1/2 nsd apd gain 100 fw.hz 1/2 10 fw.hz 1/2 1 uw 100 nw 10 nw light power 1 nw 100 pw dark 1 uw 100 nw light power 10 pw dark 1 10 100 1000 10 pw.hz 1/2 1 pw.hz 1/2 nsd apd gain 100 fw.hz 1/2 1 10 100 1000
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