User Manual
Contents
1. Schematics Pin Pad Identification and Solder Footprint MicroFC 10000 Series SMT Package 1 50 0 05 X Active Area X Active Area 1 80 0 05 Pin 1 ID Fast Output Cathode No Contact NC pin 4 should be soldered to PCB this pin can be connected to ground but it can also be left floating without affecting the dark noise 0 45 Figure 18 Solder footprint for the MicroFC 100XX SMT part All dimensions in mm C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers se S L USER MANUAL sense light MicroSC 30000 Series X13 Ceramic Package XEN S0 0 S0 0 ea c Z O e O ui o WAVER AV NN i 0 65 min uuu 0 0 X O MicroSC 60000 Series X13 Ceramic Package stor OV Z NRRL LNRS Ni N NN N NNNNA mS INA zro 0019 990 GO D C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light MicroFC 10000 Series X18 Package 3 60 318 1 15 812 0 25 083 14 00 i8 11 80 tSo OX 0 01mm D5 40 83 SECTION A A Fast Output 2 Cathode N GND Anode P G Series Low Noise Fast Blue Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light MicroFC SMTPA Board See Table 2 for pin connections dx O EA WIWE2. 50R R3 1K C1 3pF 50V C2 10nF 50V U1 OPA656 Fast Output readout options 1 Balun transformer RFXF9503 large signal to oscilloscope 2 Minicircuits amplifier ZX60 43 large signal 3 Minicircuits amplifier ZFL 1000LN small signal Vbias should be filtered with SensL generic bias filter Figure 11 DC coupled readout option The standard output is amplified through a transimpedance amplifier TIA Figure 12 AC coupled readout option DC information from the SiPM is lost but the pulse amplitude is maintained through the transimpedance amplifier TIA C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light A third option for simultaneous readout of the standard and fast outputs provides a DC coupled standard output signal and preserves the ability to read out the fast output The decoupling capacitor from the cathode to OV is critical to provide a return path for the fast output This circuit is used on the SensL SMA and SMTPA evaluation boards SensL recommend the Vbias readout options from Figures 11 and 12 for most system designs Alternative biasing schemes are discussed in Appendix A Vbias NS Fast C1 I Output OV Standard Output R1 OV Fast Output is referenced to OV H1 50R 1 mm and 3 mm 10R 6 mm C1 10nF 50V Fast Output readout options 1 Balun transformer RFXF9503 Used on SensL SMA amp SMTPA for 3mm and 6mm SiPM
3. 0 50 4x No Contact NC pin 4 should be soldered to PCB this pin can be connected to ground but it can also be left floating without affecting the dark noise Recommend that NC pin 5 paddle is not soldered to the PCB and left floating to achieve optimal soldering on pins 1 to 4 Care must be taken to ensure that no electrical contacts on the PCB such as vias short out on the paddle if using the area underneath for routing If it is desired to solder pin 5 to the PCB for example to heatsink or ground the paddle please consult your contract manufacture for their solder recommendations based on their equipment and capabilities Figure 18 Solder footprint for the MicroFC 600XX SMT part All dimensions in mm G Series Low Noise Fast Blue Sensitive Silicon Photomultipliers Se S L USER MANUAL sense light Schematics Pin Pad Identification and Solder Footprint MicroFC 30000 Series SMT Package 4 00 0 05 3 00 Active Area Pin 11D I 3 00 Active Area No Contact NC pin 4 should be soldered to PCB this pin can be connected to ground but it can also be left floating without affecting the dark noise Figure 17 Solder footprint for the MicroFC 300XX SMT part All dimensions in mm Fingers on pads 1 4 can be omitted in tight pitch PCB designs to better facilitate routing of signals G Series Low Noise Fast Blue Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light
4. left This configuration will give the best timing performance and if fast output only is required then the resistor Rs can be zero ohms or Vbias can be applied directly to the SIPM cathode Note that there will be a negative offset on the Sout signal in this configuration as the pulse is referenced to Vbias A positive bias can be applied to the cathode substrate as shown in B on the left without any change in performance However care must be taken to ensure good decoupling of the bias voltage at the device since the substrate is the return path for the fast signal If this biasing configuration is required it is recommended that a 10nF 50V ceramic SMT decoupling capacitor with low ESR is placed as close to the cathode as possible Without suitable decoupling the fast output pulse can suffer from ringing and pulse shape distortion when the positively biased cathode configuration is used An advantage of this configuration over configuration A is that the standard output is now referenced to OV potential However if the standard output is not required then the resistor Rs can again be made zero ohms or the SIPM anode connected directly to OV SensL sense light C Serles Low Noise Fast Blue Sensitive Silicon Photomultipliers USER MANUAL C Vbias 4 Vbias Direction of current R T S 4 on photon event rs g Vbias 1 xu Sout 7 en SS Aan Vs f I 4 T Fd N Vf S on photon even
5. C Series SIPM sensors have the architecture shown in Figure 2 MicroSC packaged products only have two pins giving access to the anode and cathode The fast output is not accessible in MicroSC products MicroFC MicroFC packaged products have three or more pins giving access to the fast output as well as the anode and cathode The fast output is the derivative of the internal fast switching of the microcell in response to the detection of a single photon Anode Figure 2 Simplified microcell level schematic of the C Series SIPM C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL EED Contents NA a A N EE E E E E E 1 E e ET AE EI AT TEE OE OEA 1 ioo d Y 1 C p TT o aaentar oils a wit NY UCN MO IN cia vesscec te cde scree ass EEEE E E E E E AEA REE 4 Fast Mode Biasing and Readout of MicroFC Sensors ccccccsseeccseeeecaeeeeeeeeeeeeeeeeeeeeeeeee esses eeeeeeeeeseeeeeseeeeeeeeeeeeaeeeeeaeseeeaaneesaanensaagss 4 aeeoe io eig Aeee Sa e TP B ee 4 FUA STIS INT E E E E AEE E 4 Recommended Fast Mode BASIO sesassdbsintmit aso kd abri ume sd mtb SR US NAAA cdn aui ERRA RS abs ANE EENEN EN Rr hee Esca EA EEEREN EE RENERE EENE 4 Standard Mode Biasing and Readout of C Series S
6. SNI ee EETNCCERIE 17 hada 0216 E EN E A E E mmm m 18 Paa E e A A T rmm 18 Not Connected NG Pads and IUIS eenex onis savait rica px adu Vea duicetka SERRA EXER ES ER acr sdnrk AE Fra or ONANAN EENE adu ado aa enin sd eli x addu P Rd t RE 18 gau I aerate east can tape uuu R 19 Appendix A Alternative Biasing in est POO sea iteiaskh sates vid tidie Ra n DEpYRES T4 M shilpa licen ua opidi recrear Reg tuve eire Dried d exea 20 C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light Glossary C Series A family of SiPM products based upon a P on N structure featuring sensitivity into the UV FC C Series SIPM product that has at least 9 pins or pads accessible that include anode cathode and the fast output and can therefore be used in fast mode configuration SC C Series SIPM product that has only 2 pins accessible giving access to the anode and cathode The third terminal fast output is not accessible and so SC sensors can only work in standard mode Fast mode Using the fast output signal from an FC product for improved timing or photon counting applications Standard mode Using the signal from the anode and cathode for the readout of an SC or FC product where timing performance is less critical C Series Low
7. filtered with SensL generic voltage filter Figure 10 Example readout circuit for standard mode C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light Dual Mode Readout of MicroFC Sensors It is possible to read out both fast and standard outputs simultaneously from the sensor to obtain two separate signals This can be used for obtaining timing fast output and amplitude information standard output from separate channels This could be useful for applications such as PET Positron Emission Tomography where timing and energy information are required from each photon pulse Note that this is only possible with MicroFC sensors AC and DC coupled options for connecting the device for dual readout are shown in Figures 11 and 12 C1 Standard Output Output C2 H2 Fast Output gy N n Vbias Fast Output is referenced to OV H1 2K2 1mm sensor or 470R 3mm or 6mm sensor R2 50R C1 3pF C2 100pF only required if also using Fast Output U1 OPA656 Fast Output readout options 1 Transformer RFXF9503 large signal to oscilloscope 2 Minicircuits Amplifier ZX60 43 large signal 3 Minicircuits Amplifier ZFL 1000LN small signal Vbias should be filtered with SensL aeneric voltaae filter C1 OV Fast NS Output R1 Standard Output Output R3 R2 OV Vbias Fast Output is referenced to OV H1 2K2 1mm sensor or 470R 3mm or 6mm sensor R2
8. is shown in Figure 9 Alternative biasing schemes are discussed in Appendix A Cathode SiPM Output Signals 4 0E 02 3 5E 02 7 Standard Fast 3 0E 02 D 2 5E 02 2 0E 02 Open connection Voltage V 1 5E 02 4 1 0E 02 5 0E 03 4 0 0E 00 mss Anode NOSE E 1 5E 07 s Figure 8 Biasing for standard mode The cathode Figure 9 Standard output signal blue from a MicroFC should be positive with respect to the anode but SMA 30035 when illuminated with a 40ps laser pulse Photek either a positive or negative bias can be used LPG 405 2 5 of microcells are fired in this pulse Also shown is the fast output red from the same pulse Scope Input es 500 C1 When the fast output is not in use it should be left floating Do not connect it to ground or have any wires or cables connected to it Standard Output Output Recommended Standard Mode Readout and x Amplification ne Figure 10 shows how the C Series devices can be connected to a standard high speed amplifier such as Vbias the OPA656 to convert the standard mode output signal East Ouipist mot connected current to a voltage This technique is recommended for R1 2K2 1mm sensor or 470R 3mm or 6mm sensor standard mode readout of all SensL SIPM devices In the ec C1 3pF 50V case of MicroFC devices the fast output can be left open U1 OPA656 If Fast Output is used place 100pF Capacitor from Cathode to OV Vbias should be
9. order of 2 3pF for a 1mm device than in a standard 3 5E 02 2 5E 02 7 2 0E 02 Voltage V 1 5E 02 configuration The lower output capacitance does not uns typically allow the use of a transimpedance amplifier and 5 0E 03 instead one can use an HF style 50Q impedance solution omo including direct connection to a coaxial cable The 3mm Time s and 6mm devices have higher capacitance so for best operation when connecting to an oscilloscope or driving deed Loan RF ardore eucac WORD OeOBas 2 of mace ae fred iis pulse ARO shown 5 part of the standard output pulse which is shown in full in in Figure i This provides impedance matching to improve Figure 9 Scope input 502 amplitude and timing characteristics of the pulse for 506 impedance For 1mm devices the capacitance is low enough to allow direct 50 2 connection as in Figure 6 Another feature of the fast output electrode is that it is AC coupled with no DC component However if needed one can combine it with the standard output see the next section of the SIPM to incorporate DC information Figure 4 Fast mode output red of a MicroFB SMA 30035 when illuminated with a 40ps laser pulse Photek LPG 405 Fast Output Amplification It is important to note that the signal charge injected into the fast output electrode is typically about 2 of the SIPM charge generated during the avalanche However th
10. tape and partial reels Table 4 MSL definitions applicable to SensL products reference J STD 020 All SMT shipped on tray do not have an MSL rating and should be baked prior to placement on PCB Please discuss this with your contract manufacture for their recommended baking cycle which adheres to IPC JEDEC J STD 20 MSL Classification Note the temperature of the bake should not exceed the recommended operating temperature of the product listed in product s datasheet Exposure to solvents such as concentrated isopropyl alcohol propan 2 ol or commercial flux removal fluids such as Fluxene will cause severe irreversible damage to the MLP packages If cleaning is necessary a 2096 solution of isopropyl alcohol can be used Futher details on cleaning can be found in the SMT Handling Guide Creating Arrays of SMT Sensors If multiple SMT parts are to be mounted in close proximity e g 1D or 2D arrays the following recommendations may be helpful By following this recommendations a planarity of 0 0996 to 0 5396 can be achieved e Minimum spacing between SMT parts of 200um e Use of FR4 PCB as the substrate material e Use commercial automatic placement machines to achieve the necessary placement accuracy to give the above spacing and planarity e Take into account the MSL 3 specifications of the SMT devices when assembling e Hold the PCB board in a rigid frame to avoid warping due to the heat process e The user can refer to the
11. 1mm sensor can be connected to a 50R oscilloscope 2 Minicircuits amplifier ZX60 43 3 Minicircuits amplifier ZFL 1000LN Vbias can be filtered with SensL generic bias filter if required Input voltage Vbis should be a positive Figure 13 Third option for dual readout that is employed on the SensL SMA and SMTFPA evaluation boards Further information on using a positive bias is given in Appendix A Readout of Arrays of SiPM Devices Many applications require the use of multiple sensors in the form of an array such as the SensL Array SMT line of products Large arrays can pose a readout challenge due to the many channels of amplification and processing that are required Therefore methods of reducing the number of channels are often employed in order to reduce the readout requirements Many examples of this can be found in the literature and SensL has extensive experience in developing solutions for array readout as demonstrated by the Matrix family of products A lech Note is available on the subject of large area array readout C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light C Series Mounted Sensors Some C Series sensors are available ready mounted on test boards to allow for easy evaluation The SMA and SMTPA were designed for evaluation of fast output with a DC coupled standard output The SMA board is configured for use with the circuit shown in Figure 13 and the SMTPA can als
12. C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light atf p o C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers oensL s C Series low light sensors feature an industry leading low dark count rate combined with high PDE and are available with SensL s proprietary fast mode output Three sensor sizes are available 1mm 3mm and 6mm packaged in a variety of formats including TO can ceramic header and 4 side tileable surface mount technology SMT package In addition two evaluation boards are available with pre mounted SMT sensors to facilitate rapid product evaluation This User Manual covers all aspects of using and understanding the C Series range of sensors and evaluation boards More details on the performance characteristics of the C Series sensors can be found in the C Series datasheet Overview The C Series SIPM sensors from SensL are based on a P on N diode structure Figure 1 that results in a high PDE Photon Detection Efficiency C Series hv and sensitivity into the UV Depletion All C Series SIPM sensors also feature SensL s proprietary fast output terminal Figure 2 giving access to signals with extremely fast rise times and short pulse widths C Series SIPM products are available in either MicroSC 2 pin or MicroFC 8 pin versions Figure 1 P on N sensor structure Cathode Fast Output MicroSC Although all
13. Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light Biasing and Readout Fast Mode Biasing and Readout of MicroFC Sensors Recommended Fast Mode Biasing The fast output is referenced to the cathode substrate of the SIPM Therefore OV the use of a negative bias voltage applied to the anode with cathode at OV is Cathode recommended as in Figure 3 The fast mode signal polarity is positive If an M application requires the use of a positive bias refer to the advice in Appendix A Please refer to the C Series datasheet for the operating over voltage range Fast Output Min The observed signals will be very fast with rise times ranging from 300ps to 1ns Anode and pulse widths of 600ps 3ns depending on sensor size A typical output Vbias pulse for a 3mm sensor MicroFC 30035 is shown in Figure 4 For all application circuits shown in this User Manual it is recommended that a Figure 3 Recommended biasing bias voltage filter such as the one shown in Figure 5 is used Alternative biasing schemes are discussed in Appendix A Recommended Fast Mode Readout SiPM Output Signals 4 0E 02 4 Due to the extreme speed of the signals from the fast i Standard output care should be taken in the routing of the signal voc me Common microwave RF design rules such as controlled impedance microstrip lines should be used The capacitance of the fast output electrode is much lower of the
14. YINS JO DI HI Detector See Table 1 for connections Schematics shown for 3mm versions If the schematics for the other sizes are required then please contact supportQsensl com C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light Handling and Soldering Safe Handling of Sensors e When unpacking care should be taken to prevent dropping or misorienting the sensors The specific items contained in the package and the type of packaging will depend on the parts ordered e Remember that the SIPM is a sensitive optoelectronic instrument always handle the sensor as carefully as possible e he sensor should be disconnected from the bias supply when not in use e SIPM sensors are ESD sensitive The following precautions are recommended A N e Ensure that personal grounding environmental controls and work surfaces are compliant with recommendations in JESD625 e Ensure that all personnel handling these devices are trained according to the recommendations in JESD625 e Devices must be placed in an ESD approved carrier during transport through an uncontrolled area Package Summary Table 3 summarizes packages and product type In the following sections handling and soldering advice is given for each package type Package type meee uae Product type Reflow Solder SMT Tape amp Re TR ooo CA mM E O E A E E P ES Table 3 Summary of which package typ
15. additional Iech Note on this subject C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light X18 Package The X18 TO 18 can package has through hole pins and hand soldering is recommended The SIPM can be damaged by excessive heat and so it is important that due care be given to temperature and dwell time when soldering the X18 products A maximum temperature of 260 C for no more than 10 seconds is recommended More details can be found in the Hand Soldering Guide Tech Note X13 Package The X13 ceramic package has through hole pins and hand soldering is recommended The SIPM can be damaged by excessive heat and so it is important that due care be given to temperature and dwell time when soldering the X13 products A maximum temperature of 260 C for no more than 5 seconds applied at a distance of 2mm from the ceramic base is recommended More details can be found in the Hand Soldering Guide Tech Note Not Connected NC Pads and Pins Common PCB design practice is to ground any floating pins or pads such as those labelled NVC Grounding the pin helps shielding and can reduce noise interference from external sources EMI RF C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light Further Help If more help is required in the set up or operation of C Series sensors there are several SensL resources that can help e The C Ser
16. e pulse duration is approximately 100 times shorter so the current amplitude observed is about 0 02 100 2 times higher This high current amplitude in combination with the significantly lower output capacitance make the device suitable for photon counting at very high speed tens of MHz and higher has been demonstrated in the lab For amplification of the fast signal it is recommended that a low noise 50 2 RF amplifier be used As with standard readout the level of gain required is dependent on the application For applications with high photon counts it is recommended that the Mini Circuits ZX60 43S be used For photon counting applications it is recommended that the Mini Circuits ZFL 1000LN be used For PET applications it is possible to obtain both timing and energy resolution information from the fast output with the anode and cathode only used for biasing G Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light R1 R2 Vbias Voltage C1 C2 Supply OV R1 R2 50R C1 C2 10nF 50V Figure 5 Generic biasing filter recommended for all circuits given in this User Manual OV Ss Fast Output Vbias Fast Output is referenced to OV Vbias should be filtered with SensL generic voltage filter Figure 6 Hecommended fast SiPM readout circuitry for 1mm MicroFC sensors OV Fast Output Vbias Fast Output is referenced to OV L1 RFXF9503 Vbias should be filter
17. ed with SensL generic voltage filter Figure 7 Recommended fast SiPM readout circuitry for 3mm and 6mm MicroFC sensors Also shown is the recommended transformer part number and pin out labelling C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light Standard Mode Biasing and Readout of C Series Sensors For applications that do not require fast timing from the MicroFC or for the MicroSC products that do not give access to the fast output signal SensL s C Series sensors will perform as a conventional SIPM For MicroFC products the fast output terminal can be left open with no detriment to its standard mode performance Standard mode signals may be more suitable for applications involving slow pulses or slowly varying continuous light levels such as in luminometers or for gamma ray spectroscopy with slow or low light scintillators Recommended Standard Mode Biasing Figure 8 below shows the standard mode biasing configuration For MicroFC sensors the fast output electrode is left open unconnected For all C Series sensors read out in standard mode the cathode should be held at a positive bias with reference to the anode It is recommended that the signal is taken from the side of the sensor held at OV Reading out in this way yields a pulse that has a rise time of 1ns 10ns and a decay time of several hundred ns depending on sensor and microcell size A typical standard mode output pulse shape
18. ensors ssssssssssssssssssee eene eene nenne nnns nnn ai ansa s risas nnns ansa nnns nn 6 mises He berzit uaee im MONEO o omm 6 Recommended Standard Mode Readout and ATmplific amp UOFT ac citiecuniad inicia escena rici Cr cta i vi rd ER RR rne rw a ic 6 Dual Mode headout ol eie depu Ics D UTD 7 Readout of Arrays Of SIPM D eviCes issssssssseeeeen mener nnne nnne nne rns rns risa nsa ansa nsa i essi sese esse nsns SEE nnn nnns 8 Sor cffe BINOS 9 gc E EE E E EA TOO mmm 9 Mile T M eee 9 PET lt MT apm enn gee 10 Schematics Pin Pad Identification and Solder FOOLDDFIEIL casei ncc seek niei eicere i coe ac ca ecc eon ae Re enn ev tae lta 11 PTO COO Series SMT CS serseri cele TETUR 11 ochematics Fin Fad ldenticatonand Solder HOON ONIN NT T mmm 12 MicroFC 60000 Series SMT Sic vcio NR E T2 MicroSC 30000 and 10000 Series X13 Ceramic Package essssssesseneeneeeeeenn nennen nnne nni anser narra nnn nn 13 MicrooG CoJo Saries ESAE Ic Me Ecce NAT EO DN 13 Vile ge WOO see TATO FC cie ae sec Serene ose mmm 14 We gecelixi3070 M 15 Weie dcc cds eee E E AN T E E A eT A OEE EE EE AE E E NEETA EE TE 15 woe aoka ie e NO ES E IET T oT 16 pe Wa Polas Rs edo ET ETOILE 16 miele Pe AM NUR MN ETE 16
19. es are associated with which product type See Table 4 for definition Sensors shipped in either a waffle pack WP or gel pack GP require a bake according to J STD 20 prior to reflow soldering C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light SMT Package A dedicated SMT Handling and Soldering Tech Note is available that contains in depth information on the storage and use of the SMT parts including the CAD for the tape and reels The SMT package is compatible with standard reflow solder processes J STD 20 and so is ideal for high volume manufacturing The recommended solder footprints are shown in the Schematics section of this document If the SMT part is being assembled into an array the advice on page 11 and in the SMI Array Tech Note should be followed SMT SiPM sensors are shipped in moisture barrier bags MBB according to the J STD 033 standard An unopened MBB should be stored at a temperature below 40 C with humidity below 9096RH After the MBB has been opened the devices must be reflow soldered within a period of time depending on the moisture sensitivity level MSL SensL SMT Tape amp Reel are MSL 3 cut tape SMT are MSL 4 and SMT sensors shipped in trays require a bake prior to reflow soldering See Table 4 for details MSL Exposure time Condition Applicable SMT shipping format 168 hours 30 C 60 RH Tape and reel LL pow 30 C 60 RH Cut
20. icroFC SMA is recommended for users who require a plug and play set up to quickly evaluate MicroFC sensors with optimal timing performance The board provides outputs which can be connected directly to the oscilloscope or measurement device The board also allows the standard output from the anode to be observed at the same time as the fast output Table 1 summarizes the connections to the SMA board Each board has two mounting holes to allow secure placement during testing with sensors located at the edge of the board This allows two sensors to be placed in close proximity for coincidence timing measurements C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light MicroFC SMTPA The MicroFC SM TPA XXXXX or Pin Adapter board Figure 15 features an SMT packaged SiPM sensor type specified by the XXXXX digits mounted onto a small PCB board The PCB has five through hole pins that allow easy electrical connections to the electrodes of the SMT sensor The pins are labeled on the PCB with numbers 1 5 Each of the numbered pins is connected as listed in Table 2 with the option to use either a positive or negative bias Note that the positive bias configuration see Figure 13 will provide better timing performance than the negative bias configuration Function Connection Negative bias 1 anode standard output negative bias input if unused connect to zero V g p D ae fast output fast output
21. ies Datasheet contains more detailed information on the physical and performance characteristics of the sensors e A variety of Tech Notes are available on the website www sens com such as e A guide to handling and soldering SMT packages e A guide to hand soldering through hole SensL sensor products e A guide on creating arrays of close packed SMT sensors e Anextensive library of technical and scientific papers on the use of SensL SIPM sensors e f additional help is needed please contact support sensl com C Series Low Noise Fast Blue Sensitive Silicon Photomultipliers S e S L USER MANUAL sense light Appendix A Biasing Alternatives amp Signal Polarity This Appendix lists all of the possible ways in which a C Series SiPM can be biased Not all of them will deliver optimimum performance but are included for completeness For each biasing arrangement the standard and fast signal polarities are given The following abbreviations are used throughout Vbias bias voltage Sout standard output Fout fast output Rs load resistor for the standard output Rf load resistor for the fast output Vs standard output voltage Vf fast output voltage HQ quench resistor included on the SIPM die Vbias Direction of current Rs on photon event Direction of current on photon event When using one of the MicroFC products in fast mode it is recommended to use biasing scheme A as shown on the
22. if unused can be left open if unused can be left open standard output Poste Sie if unused connect to zero V Figure 15 Pin numbering on the 4 gd SEE DOE ne MicroFC SMTPA board do not connect do not connect Table 2 Pin assignments for the MicroFC SMTPA board The biasing circuit of the SMTPA is the same as on the SMA board as indicated by Figure 13 however it does not contain any on board decoupling on the bias line Therefore a bias filter such as that in Figure 5 should be included on the bias line before connecting to the relevant bias input pin see Table 2 The standard output can be connected directly to an amplifier or 50 2 load oscilloscope If the standard output is not used then that pin should be connected to zero Volts It should be noted that the presence of the pins will slightly degrade the signal from the sensor Figure 16 shows a typical pulse from a MicroFC SMTPA 30035 1 2E 00 1 0E 00 The connectors from Samtec used are 8 0E 01 BBL 103 G E 6 0E 01 Voltage V BBL 102 G E sen 2 0E 01 Compatible sockets from Samtec are 0 0E 00 SL 103 G 10 2 SL 102 G 10 n Figure 16 Typical pulse from a MicroFC SMTPA 30085 G Series Low Noise Fast Blue Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light Schematics Pin Pad Identification and Solder Footprint MicroFC 60000 Series SMT Package 4 5 QU LM Lr QU gt U lt T w c c D
23. o be configured in this way with the use of an external decoupling capacitor and sense resistor Note that the 3mm and 6mm versions of the SMA and SMTPA have baluns at their fast outputs for signal shaping and impedance matching The use of these boards is detailed in the following sections MicroFC SMA The MicroFC SMA XXXXX product line Figure 14 features either an SMT or X18 packaged SiPM sensor type specified by the XXXXX digits soldered onto a small PCB board The board is simple to use having just three SMA female connectors one delivers the bias voltage Vbias and the other two provide the output signals standard output from the anode Sout and the fast output Fout The circuitry on the board is designed to bias the sensor in such a way as to retain the optimum high speed performance A typical output pulse is shown in Figure 4 which was taken from a MicroFC SMA 30035 The circuitry used is as given in Figure 13 with the addition of a bias filter Figure 5 and transformer on the fast output of the 3mm and 6mm versions Figure 7 The schematics showing all dimensions are on page 16 Fast output Mounting holes __ Standard output Figure 14 The MicroFC SMA board 3mm SMT version Output bias input cathode positive bias input a one LL fesouput if unused oan beleftopen WA corecor fast output if unused can be left open standard output anode if unused can be left open Table 1 SMA Connections The M
24. t Direction of current R S Neither of the biasing schemes represented in C or D are recommended for use with high precision timing applications on the standard or in particular the fast output as these schemes would require the cathode substrate plane of the SIPM chip to be switched However either would be suitable for applications where the pulse timing is not critical www sensl com sales sensl com 353 21 240 7110 International S e S L 1 650 641 3278 North America All specifications are subject to change without notice sense light
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