c12668 series balanced detectors with reduced multiple re- flections 1 balanced detectors www.hamamatsu.com employs our unique structure that reduces multiple reflections at the incident light wavelength of 1.0 m or 1.3 m input section: fc receptacle (apc polished) a single-mode fiber with an fc connector can be connected. cutoff frequency: 200 mhz output section: sma receptacle common-mode rejection ratio (cmrr): 35 db typ. compact features oct application these are differential ampli cation type photoelectric conversion modules containing two hamamatsu photodiodes with bal- anced characteristics. the photodiodes are connected in a direction that cancels out the photocurrent of each photodiode. this con guration cancels out the common mode noise of the two incident light rays. the minute difference in light levels is treated as a displacement signal, converted into an electrical signal, and output. moreover, the adoption of our unique struc- ture that suppresses multiple re ections of incident light has made it possible to reduce the noise caused by the re ections. these products can be applied to optical coherence tomography (oct) used in ophthalmologic examinations and the like. the balanced detector can convert into electrical signals the minute difference in the signal light produced when the back scatter- ing light from the subject is made to interfere with the reference light. structure parameter speci cation unit built-in element ingaas pin photodiode - dimensions 65 75 25 mm weight 168 g input section fc receptacle (apc polished) - output section sma receptacle - absolute maximum ratings parameter symbol condition value unit supply voltage vs ta=25 c 17 v operating temperature * 1 topr 0 to +50 c storage temperature * 1 tstg -10 to +60 c * 1: no condensation note: exceeding the absolute maximum ratings even momentarily may cause a drop in product quality. always be sure to use the product within the absolute maximum ratings.
2 balanced detectors c12668 series electrical characteristics (ta=25 c, unless otherwise noted) parameter symbol condition min. typ. max. unit supply voltage * 2 vs 12 v 11 12 13 v current consumption ic 12 v, dark state 52 60 64 ma output impedance zo out terminal - 50 - monitor terminal - 220 - * 2: use a power supply with at least 200 ma output. electrical and optical characteristics (typ. ta=25 c, unless otherwise noted) parameter symbol condition c12668-01 c12668-02 unit optimal wavelength band * 3 o - 1.0 1.3 m photosensitivity s pd optimal wavelength 0.75 0.95 a/w frequency bandwidth fb -3 db, out terminal dc to 200 mhz -3 db, monitor terminal dc to 0.1 common-mode rejection ratio * 4 cmrr out terminal 35 db transimpedance gain zt out terminal 3 10 4 v/a monitor terminal 1 10 4 v/a output noise voltage vn dark state, 50 termination, out terminal 40 max. mvp-p * 3: wavelength band in which multiple re ections can be reduced the most * 4: output difference when an approximately 70 w light is applied to only the input- terminal and when applied to input+ and input- terminals (see the frequency characteristics) frequency characteristics (typical example) kaccb0358ea frequency (mhz) output (db) 0.1 0.01 -10 0 10 20 30 40 50 60 1 cmrr 10 100 1000 (ta=25 c) applied only to input- terminal applied to input+ and input- terminals
3 balanced detectors c12668 series block diagram dimensional outline (unit: mm) kaccc0761ea amplifier amplifier amplifier i/v amplifier input- input+ mon- mon+ out input+ (fc/apc) input- (fc/apc) mon.+ mon.- p. s . 12 v out 54.5 10 11 (24) 14 (7.5) (11) 65 (8.5) (11) (9.5) (14) (15) (15) (10.5) m4 indication m4 depth 6 no8-32unc depth 6 (20) (28.5) tolerance unless otherwise noted: 0.3 kacca0351ea
4 balanced detectors c12668 series (?9.8) 1 4 3 rkmv 3-224/2m (lumberg automation, 3-pin, female) (4.3) (2000) (27) (8.2) (15) pin no. 1 3 4 wire color brown (+12 v) blue (-12 v) black (gnd) accessory (unit: mm) kacca0352ea connection example (ophthalmic medical oct) eyeball interference light oct wavelength swept light source daq interface + pc balanced detector balanc d ed d d et ecto r mirror for reference light kaccc0762ea cable for power supply (no connector on one end)
cat. no. kacc1219e01 feb. 2015 dn www.hamamatsu.com hamamatsu photonics k.k., solid state division 1126-1 ichino-cho, higashi-ku, hamamatsu city, 435-8558 japan, telephone: (81) 53-434-3311, fax: (81) 53-434-5184 u.s.a.: hamamatsu corporation: 360 foothill road, bridgewater, n.j. 08807, u.s.a., telephone: (1) 908-231-0960, fax: (1) 908-23 1-1218 germany: hamamatsu photonics deutschland gmbh: arzbergerstr. 10, d-82211 herrsching am ammersee, germany, telephone: (49) 8152-375-0, fax: (49) 8152-265-8 france: hamamatsu photonics france s.a.r.l.: 19, rue du saule trapu, parc du moulin de massy, 91882 massy cedex, france, telephone: 33-(1) 69 53 71 00, fax: 33-(1) 69 53 71 10 united kingdom: hamamatsu photonics uk limited: 2 howard court, 10 tewin road, welwyn garden city, hertfordshire al7 1bw, united kingdom, telephone: (44) 1707-294888, fax: (44) 1707-325777 north europe: hamamatsu photonics norden ab: torshamnsgatan 35 16440 kista, sweden, telephone: (46) 8-509-031-00, fax: (46) 8-5 09-031-01 italy: hamamatsu photonics italia s.r.l.: strada della moia, 1 int. 6, 20020 arese (milano), italy, telephone: (39) 02-93581733 , fax: (39) 02-93581741 china: hamamatsu photonics (china) co., ltd.: b1201, jiaming center, no.27 dongsanhuan beilu, chaoyang district, beijing 100020 , china, telephone: (86) 10-6586-6006, fax: (86) 10-6586-2866 product specifications are subject to change without prior notice due to improvements or other reasons. this document has been carefully prepared and the information contained is believed to be accurate. in rare cases, however, there may be inaccuracies such as text errors. before using these products, always contact us for the delivery specification sheet to check the latest specifications. type numbers of products listed in the delivery specification sheets or supplied as samples may have a suffix "(x)" which means preliminary specifications or a suffix "(z)" which means developmental specifications. the product warranty is valid for one year after delivery and is limited to product repair or replacement for defects discovered and reported to us within that one year period. however, even if within the warranty period we accept absolutely no liability for any loss caused by natural d isasters or improper product use. copying or reprinting the contents described in this material in whole or in part is prohibited without our prior permission. information described in this material is current as of february, 2015. balanced detector c12668 series 5 related information www.hamamatsu.com/sp/ssd/doc_en.html precautions disclaimer
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