Overview R-Series: Low Noise, Fast, Red-Sensitive Silicon
Contents
1. E E vere na aeea E E E E cuaa coat waeeie nace onesies ce ainin ER 3 Fast Mode Biasing and Readout of MicroFR Sensors cccccseeeeeteeeeeeee gine N 3 Recommended Fast Mode Readout c cise NORNER lt C 3 Fast Output Amplification ccccs ese e d D Recommended Fast Mode Biasing c cccceecsseceecneenseceucceecsecaecesessesesaesenessueseeeaeeseeeneeseetentaags 9 Standard Mode Biasing and Readout of R Series Sensors ccccceccssecceeceeeeeeeeesereeeeeseeaeeeaeeeaeeeaeeeaees 5 Recommended Standard Mode BiaSINg cc ccecce ses Zi ss SR WIP see ceeeeseeessesenees 5 Recommended Standard Mode Readout and Amplification ccceccceccsseeseeeeeeeeeeeseeeaeeaeeeaeeeaes D R Series Evaluation Board MicroFR SMA ssssssssesssrnsrnsrnesrn SIN css OO ssc ueeeaueeuuseuuesunseunssunseuunssns 6 schematics Pin Pad Identification and Solder FOOTOrinig my SNMMMMMMMMD sccsccuusussecssuseuscneusaeenevseeseursusseereas 7 MicroFR 10000 Series MLP Package da CA N Me ca cccsccceeseseesecesceeesesesseceseenseeesneeens T MicroFR SMA 100XX Board ssssensen MM Mose ceaeeecse sensu seseeseeseuseseeeeessrensuressnaeesaerens 8 Handling and Soldering ccccee eee Qs os Mg cM nec eescaeecaaeceasecsaeesseecesecseessesecesessaeesseessasesees 9 Safe Handling Of SENSOMS cccce cee ee NAMM see Meee ceccsecceseceseeseeecneeccaeecaseesesecseeeseeecsaceseeecseeesseessess 9 BaVe2. 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 RQ quench resistor included on the SiPM die A Vpbias Direction of current on photon event Vbias N Direction of current R S on photon event OV When using one of the MicroFR products in fast mode it is recommended to use biasing scheme A as shown on the 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 positive offset on the Sout signal in this configuration as the pulse is referenced to Vbias A DC blocking capacitor could be used to block the bias Alternatively a negative bias can be applied to the anode substrate as shown in B on the left 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 SOV ceramic SMT decoupling capacitor with low ESR is placed as close to the cathode as possible Without suitable decoupling the fast output pul
3. 3 Recommended biasing Recommended Fast Mode Readout Due to the extreme speed of the signals from the fast outout care should be taken in the routing of the signal Common microwave FF design rules such as controlled impedance microstrip lines should be used The capacitance of the fast output electrode is much lower of the order of 2 3pF for a 1mm device than that from the standard output The lower output Capacitance does not typically allow the use of a transimpedance amplifier and instead one can use an RF style 50 impedance solution including direct connection to a coaxial cable 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 the 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 50922 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 Circults ZX60 43S5 be used For photon counting applications it is recommended
4. R Series Low Noise Red Sensitive Silicon Photomultipliers SC S L USER MANUAL D d sense light T Fe R Series Low Noise Fast Red Sensitive Silicon Photomultipliers d S o S T ai ee e 4 t Q el taolo ai m The R Series is a new family of Silicon Photomultiplier SIPM sensors providing sensitivity into the red and NIR portion of the electromagnetic spectrum Ihe R Series SiPM sensors feature high responsivity fast signal response and a low temperature coefficient of operating voltage all achieved at a bias of 30V The sensor is packaged in a compact and robust MLP package that is suitable for reflow solder processes Both the sensor and the package are designed for volume production with the Ge E product delivered on tape and reel A 1 t Sy z 7 z mans A This User Manual covers all aspects of using and understanding the R Series range a A y gt 1 4 PS of sensors and evaluation boards More details on the performance characteristics of the R Series sensors can be found in the R Series datasheet Overview The R Series SiPM sensors from SensL are based on an N on P diode R Series structure Figure 1 and have a different pin out pulse polarity and poly bias voltage compared to SensL P on N sensors i e C Series and h e J Series Please consult the R Series pin out that is given on page 7 p and the datasheet for the correct bias voltage Some notable features of the R
5. Series are as follows Responsivity R Series sensors feature high density microcells which in conjunction with the sensors high gain yield impressive responsivity values even at 905nm 530 kA W Cathode Fast Output Anode Figure 2 Simplified microcell level schematic of the R Series SiPM Figure 1 N on P sensor structure Timing R Series sensors feature optimized quench resistor values and other improvements that have dramatically reduced the microcell recovery time and the standard signal rise time All R Series sensors also feature SensL s proprietary fast output terminal Figure 2 which is the derivative of the internal fast switching of the microcell in response to the detection of a single photon and has sub nanosecond rise times and pulse widths These features make the R Series sensors highly suited to high performance timing applications Package The R Series sensors are packaged in a low cost highly robust surface mount MLP micro leadframe package It has been designed for volume applications and is available on tape and reel and compatible with industry standard reflow soldering processes The R Series sensors are also available pre mounted on a small PCB evaluation board allowing for easy access to the fast output anode and cathode via SMA connectors R Series Low Noise Red Sensitive Silicon Photomultipliers SC S L USER MANUAL SENERA Contents ATN a E eee ee a a a e 1 PASIAN Ch Five AOU aE cne
6. d so is ideal for high volume manufacturing The recommended solder footprint is shown with the schematics on page 7 If the MLP part is being assembled into an array the advice in the SMT Array Tech Note should be followed MLP SIPM sensors are shipped in moisture barrier bags MBB according to the J STD 083 standard An unopened MBB should be stored at a temperature below 40 C with humidity below 90 RH After the MBB has been opened the devices must be reflow soldered within a period of time depending on the moisture sensitivity level IMSL SensL MLP Tape amp Reel are MSL 3 cut tape MLP are MSL 4 and MLP sensors shipped in trays require a bake prior to reflow soldering See Table 3 for details MSL Exposure time Condition Applicable MLP shipping format 168 hours lt 30 C 60 RH Tape and reel i men lt 30 C 60 RH_ Cut tape and partial reels Table 3 MSL definitions applicable to SensL MLP products reference J STD 020 All MLP 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 cau
7. ence timing measurements The schematics showing the dimensions of the SMA board are on page 8 R Series Low Noise Red Sensitive Silicon Photomultipliers Se S L USER MANUAL sense light Schematics Pin Pad Identification and Solder Footprint MicroFR 10000 Series MLP Package oO D 1 50 0 05 lt X Active Area x a N 2 O S H O 00 0 25 4x Pin 1 ID 0 17 Cathode N Fast Output Anode P No Connect 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 8 Solder footprint for the MicroFR 100XX MLP part All dimensions in mm R Series Low Noise Red Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light MicroFR SMA 100XX Board 20 00 E fi 12 50 37 00 nr ew Wi MUD l wie i JODIN el i 1 00 f 40 00 See Table 1 for SMA connections R Series Low Noise Red Sensitive Silicon Photomultipliers SC 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
8. geeeleic EE A ee E 9 MLP Package oh C lt i eee 10 Not Connected daS Pal Baril FUMIE cccscccscccsucnusssuvssusscuvscusscusseuuseuuseuuseuueuusesunsuenavesavsnssrassesesenssens 11 aonic aa EEEN MF SEO EE E E E E eer 12 Appendix A Biasing Alternatives amp Signal Polarity ccccccccssccssccusscusscuussusseusseuvscuuscuuseuuseuuaessagersusseuussuuseuss 13 R Series Low Noise Red Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light Biasing and Readout Fast Mode Biasing and Readout of MicroFR Sensors Vbias Recommended Fast Mode Biasing Cathode The fast output is referenced to the anode substrate of the SiPM Therefore AS the use of a positive bias voltage applied to the cathode with the anode at O V is recommended as in Figure 3 The fast mode signal polarity is negative and Fast Output AC coupled with no DC component The observed signals will be very fast with rise times 300ps and pulse widths lt 1ns Please refer to the R Series Anode datasheet for the operating bias to use OV For all application circuits shown in this User Manual it is recommended that bias voltage decoupling such as the one shown in Figure 4 is used SensL do not recommend the use of a negative bias because It can cause degradation of the signal from the fast output If an application requires the use of a negative bias please refer to the advice in Appendix A and specifically schematic B Figure
9. handle the sensor as carefully as possible e The sensor should be disconnected from the bias supply when not in use e SIPM sensors are ESD sensitive The following precautions are recommended A had 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 Delivery Options Table 2 summarizes the delivery options In the following sections handling and soldering advice is given for each package type Package type Delivery option Reflow Solder SMT Tape amp Reel TRlapeaRea s v Y ig SMT Cut Tape TA Cut Tape 4A d 4 i WP Waffle pack Table 2 Summary of which package types are associated with which product type See Table 3 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 R Series Low Noise Red Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light MLP Package A dedicated SMI Handling and Soldering Tech Note is available that contains in depth information on the storage and use of the MLP parts including the CAD for the tape and reels The MLP package is compatible with standard reflow solder processes J STD 20 an
10. hat 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 and a decay time constant of between 10ns 5Ons depending on microcell size Various biasing schemes are discussed in Appendix A Cathode Ns Fast Output Anode Figure 5 Biasing for standard mode The cathode should be positive with respect to the anode but either a positive or negative bias can be used 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 C1 Vbias Recommended Standard Mode Readout and Output Amplification Standard Output R2 Figure 6 shows how the R Series devices can be connected to a standard high speed amplifier such as the OPA656 OV to convert the standard mode output signal current to a voltage This technique is recommended for standard Fast Output not connected mode readout of all SensL SIPM devices The fast output R1 2kK2 should be left open R2 50R C1 3pF 50V U1 OPA656 Figure 6 Example readout circuit for standard mode lf the fast output is used place a 100nF from anode to OV Vbias should be decoupled as in Figure 4 R Series Low Noise Red Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light R Series Evaluation Board MicroFR SMA The R Series sensors are available ready mounted on test boards to allow for easy evaluati
11. on The MicroFR SMA 100XX product line Figure 7 features an R Series MLP packaged SiPM sensor type specified by the 100XX 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 cathode Sout and the fast output Fout The SMA board requires a negative bias which allows the standard output to be referenced to ground rather than the bias The circuit on the SMA board is as in example B of Appendix A along with the decoupling circuit of Figure 4 output Mounting i holes _ BIAS ges I SMT sensor 43 Standard output Figure 7 The MicroFR SMA board eh a as bias input anode Standard female ee SMA connector standard output cathode Table 1 SMA Connections The MicroFR SMA is recommended for users who require a plug and play set up to quickly evaluate R Series 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 cathode 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 coincid
12. se can suffer from ringing and pulse shape distortion when the negatively biased anode 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 R Series Low Noise Red Sensitive Silicon Photomultipliers USER MANUAL sense light C Vbias Vbias Direction of current R S on photon event ao j Direction of current R on photon event 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 or the substrate 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 S O l S E 353 21 240 7110 International 1 650 641 3278 North America sense light All specifications are subject to change without notice
13. se severe irreversible damage to the MLP packages If cleaning is necessary a 20 solution of isopropyl alcohol can be used Further details on cleaning can be found in the SMT Handling Guide Not Connected NC Pads and Pins Common PCB design practice is to ground any floating pins or pads such as those labelled NC Grounding the pin helps shielding and can reduce noise interference from external sources EMI RF R Series Low Noise Red Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light Further Help If more help is required in the set up or operation of R Series sensors there are several SensL resources that can help e The R Series 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 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 sens com R Series Low Noise Red Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light Appendix A Biasing Alternatives amp Signal Polarity This Appendix lists all of the possible ways in which a R Series SIPM can be biased Not all of them will deliver optimum performance but are included for completeness For
14. that the Mini Circuits ZFL 1O000LN be used R Series Low Noise Red Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light Vbias Vbias 10nF 10nF OV OV Figure 4 Generic bias decoupling for positive left and negative right biasing configurations recommended for all circuits given in this User Manual R Series Low Noise Red Sensitive Silicon Photomultipliers SC S L USER MANUAL sense light Standard Mode Biasing and Readout of R Series Sensors SensL s R Series sensors can also be used in the conventional manner using the anode and cathode and leaving the fast output unconnected SensL refer to this as standard mode In this case 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 Standard mode can also benefit applications that can take full advantage of the high gain of the SIPM to reduce the gain requirements of subsequent gain stages Recommended Standard Mode Biasing Figure 5 below shows the standard mode biasing configuration For MicroFR sensors the fast output electrode is left open unconnected For all R Series sensors read out in standard mode the cathode should be held at a positive bias with reference to the anode It is recommended t
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