phy109 5- 01 -rd- 1. 1 datasheet page 1 phy1095-01 1 .25 g bps high sensitivity transimpedance amplifier features ? - 32dbm sensitivity ? up to 1 .25 g bps (nrz) data rates ? 60 na rms typical input referred noise ? automatic gain control ? flexible bond pad layout and output signal inversion for simple rosa layout ? received signal strength indicator output with selectable direction of current flow ? - 40 to +9 5c operating temperature range applications ? gepon optical network unit (onu) ? gigabit ethernet r f voltage regulator pda rx+ rx- vcc gnd pdc 1/2 amplifier signal detect & dc restore 5 0? agc amp 5 0? agc signal strength indicator rssi data_invert o/p buffer rssi_dir figure 1: outline block diagram d escription the phy1095 is a transimpedance amplifier designed for use within small form factor fi bre optic modules targeted at g iga b it e nabled passive optical network (gepon) applications. working from a 3.3v power supply t he phy1095 integrates a low noise transimpedance amplifier , with a typical differential transimpedance of 60k ? , an agc and an output stage. the rssi pad can be used to implement a signal strength monitor circuit. th is is designed to sink or source a current equal to the photodiode current for ease of interfacing. s ensitivity of -32 dbm can be achieved at 1 .25gbps using a photodiode with 0.5pf capacitance and a responsivity of 0. 8 a/w at a wavelength of 1490nm . the phy109 5 is available in die form for mounting on a header to create a rosa when com bined with suitable optics and p hoto - detector diode. figure 2: device pad layout a maxim integrated products brand 19 - 56 8 9; rev 1/11 downloaded from: http:///
phy109 5- 01 -rd- 1. 1 datasheet page 2 1 ordering information part number description package phy1095-01ds-wr 1.25g high sensitivity tia bare die in waffle pack phy1095-01ds-fr 1.25g high sensitivity tia film on grip ring 2 pad description number name type description 1 gnd 1 pwr connect to analog ground 2 pdc 1 analog regulated power supply to photodiode cathode 3 pda analog connect to photodiode anode, input to tia stage 4 pdc 2 analog regulated power supply to photodiode cathode 5 gnd 2 pwr connect to analog ground 6 rssi analog out received signal strength output. sinks or sources current equal to pd current 7 vcc 1 pwr 3.3 volt power supply connection 8 vcc 2 pwr 3.3 volt power supply connection 9 rx- analog out differential analog output pair with rx+ 10 gnd 3 gnd connect to analog ground 11 gnd 4 gnd connect to analog ground 12 gnd 5 gnd connect to analog ground 13 data_invert analog input inverts polarity of data output pins rx+ and rx- 14 gnd 6 gnd connect to analog ground 15 gnd 7 gnd connect to analog ground 16 gnd 8 gnd connect to analog ground 17 rx+ analog out differential analog output pair with rx- 18 agc analog disables agc amplifier function when connected to gnd 19 vcc 3 pwr 3.3 volt power supply connection 20 vcc 4 pwr 3.3 volt power supply connection 21 rssi _dir analog input selects whether rssi output is a current sink or source. open circuit is a current sink, connect to ground for current source downloaded from: http:///
phy109 5- 01 -rd- 1. 1 datasheet page 3 3 device specifications 3.1 absolute maximum ratings exceeding these limits may cause permanent damage. correct operation under these conditions is not implied. extended periods of operation under these conditions may affect device reliability. parameter conditions min max unit supply voltage -0.5 4.0 v maximum voltage on signal pins -0.5 vcc + 0.5v v device operating temperature measured on die +115 c storage temperature -55 150 c die attach temperature 400 c pda input current 1 average input current, vcc > 3.0v, pin photodiode biased internally from pdc, er=10db 3.0 ma ramp time of input current to maximum (0ma to 3ma) from initial optical input 200 s esd performance human body model (excluding pda pin) 2.0 kv human body model (pda pin) 0.5 kv notes: 1 see section 4.1 in case of external vpd biasing of the photodiode 3.2 recommende d operating conditions parameter conditions min typ max unit supply voltage 3.0 3.3 3.6 v current consumption including output termination 30 42 55 ma ambient operating temperature -40 95 c photodiode capacitance photodiode bias voltage 1.8v 1.0 pf downloaded from: http:///
phy109 5- 01 -rd- 1. 1 datasheet page 4 3.3 parametric performance parameter conditions min typ max unit high-speed data input rate c in = 0.5pf 1.25 gbps sensitivity examples c in = 0.5pf, responsivity = 0.8a/w, ber = 10 - 12 er = 10db -31.5 dbm c in = 0.5pf, responsivity = 0.8a/w, be r = 10 -10 er = 10db -32.0 dbm input referred noise c in = 0.5pf, measured into a 940mhz, 4 th order bessel filter. 60 90 na rms small signal bandwidth (-3db) relative to 100mhz, c in = 0.5pf 750 860 mhz low frequency cut-off relative to +100mhz 25 khz gain variation with frequency 1mhz to 630mhz 2 db differential output swing 1 input current > 8 a pp 100 ? differential load, 1.25gbps 320 400 480 mvp -p parameter conditions min typ max unit transimpedance (differential) input current <8 ap-p 50k 60k 70k ? deterministic jitter k28.5 pattern 25 50 muip-p overshoot 2 7 -1prbs (wrt to average 0/1 level) 15 % undershoot 2 7 -1prbs (wrt average 0/1 level) 15 % input overload, a.c. dj within spec 1.5 mapp input overload d.c. dj within spec 1.0 ma agc settling time 50 s output resistance differential rx+ to rx- 80 100 120 ? photodiode cathode voltage 0.3 a photodiode current 2.5 2.6 2.7 v photodiode anode voltage 0.8 1.0 v rssi current accuracy measured relative to photodiode current 20 % rssi compliance voltage source mode, i in =0.5ma 0 1.1 v sink mode, i in =0.5ma 0.7 vdd-0.8 v power supply rejection ratio 100khz - 4mhz 30 40 db notes: 1 expected load is 2 x 50 ohms downloaded from: http:///
phy109 5- 01 -rd- 1. 1 datasheet page 5 4 device description the phy1095 implements a complete analog front end, converting the photo - detector current, into a differential analog voltage signal. the p hy1095 also provides a filtered bias current to the photo - detector to increase the level of component integration as well as the signal processing functions. 4.1 photodiode connection the recommended method to connect a pin photodiode to phy1095 is using the internal voltage reference to bias the photodiode as shown in figure 3. the internal reference supplies a low noise output with high power supply rejection to 4ghz. c onnection of a pin photodiode to the pda input with an external vpd bias supply can produce inconsistent sensitivity and bandwidth operation. the maximum damage level for the pda input is reduce d to <1ma when pda is connected in this way . the voltage across the photodiode is equal to the power supply voltage, vpdc minus the input bias voltage o f the input of the phy1095, equal to vpda. the anode voltage, vpda is sensitive to temperature and has a typical value of 0.8v. rssi pdc 1 pda mon 0v vpda vpdc vcc 3.3v phy1095 internal voltage reference figure 3 C photodiode biased by internal voltage regulator 4.2 dc cancellation the removal of the direct current component of the input signal is necessary to reduce the pulse wi dth distortion for signals with a 50% mark density. the dc cancellation block provides low frequency feedback using an internally compensated ampli fier, removing the need for external compensation capacitors. downloaded from: http:///
phy109 5- 01 -rd- 1. 1 datasheet page 6 4.3 transimpedance amplifier (tia) the transimpedance (current to voltage) stage is a very low noise amplifier with a feedback resistor to set the gain. this stage features automatic gain control, where the transimpedance depends on the output signal level . this ensures that the output does not overload the subsequent stage in the signal pat h. an internal voltage regulator is used to power the front - end transimpedance amplifier in order to improve the rejection of power supply noise. 4.4 output gain stage the output gain stage features a voltage amplifier, a single ended to differential converter and a s upply referenced differential output buffer. the phy1095 has a 50 ? single ended output impedance, which is suitable for the majority of applications. for optimum sup ply - noise rejection, the phy1095 should be terminated differentially. 4.5 output data polarity the data polarity pin has an internal 8k ? pull - up resistor . i n normal non - inverting operation, where there is no external connection , the pin pulls to vdd. in this mode an optical '1' gives maximum input current and a voltage '1' on the positive output pin rx+ . c onnection of the pad to ground selects an inverted sense output. 4.6 received signal strength indication (rssi) the phy1095 provides a rssi output which can be used to measure the strength of the received optical signal. the photodiode current is proportional to the received optical power. the phy1095 generates an output current which is a mirror of the photodiode current. the rssi output is either a current sink or a current source . the direction of current flow is selected by using the rssi_dir bond. leaving this bond pad unco nnected selects a current sink, connecting this bond pad to ground selects a current source. an alternative method of measuring the received signal power is by using the received optical m odulation amplitude (oma). this method is provided by the phy1078 integrated bu r st mode laser driver and post amplifier device. downloaded from: http:///
phy109 5- 01 -rd- 1. 1 datasheet page 7 5 typical application overload r f voltage regulator pda vcc gnd pdc 1/2 amplifier signal detect & dc restore 5 0? agc amp 5 0? agc signal strength indicator rssi phy1095 rx+ rx- rxin+ rxin- cml output input amp low pass filter rxout- rxout+ phy1078 o/p buffer data_invert figure 4 - typical application : gepon onu receiver path figure 4 shows a typ ical application for the phy1095. in this application the output of the phy1095 is connected to the phyworks phy107 8 pon laser driver and post amplifier circuit to form the receive path for a fibre optic module . the phy1078 provides the receive signal monitoring functions such as loss of signal and converts the input data into a variety of electrical formats. 5.1 layout and bonding in order to achieve the best performance it is necessary to minimise noise pickup and to reduce the effects of parasitic components. noise is picked up through the signal paths or through the power supply. noise at the input of the tia will be amplified and mixed with the wanted signal. this can be a result of noise pickup in the other components connected to the tia input , such as the photodiode, the capacitors and the bond wires. noise picked up in the signal path can be reduced by keeping bond wires short and b y making sure the output and input bond wires are not clo se and are orthogonal to each other, power supply noise will be present as a result of the power supply design, the quality of decoupling precautions and pickup in the bond wires. to effectively de - couple supply rail noise to ground a capacitor may be placed inside the rosa. this should be placed as close as possible to the vcc pin on the tia. this reduces the effect of the bond wire inductance. the high psrr performance of phy1095 enables th e decoup ling capacitor to be omitted and fewer ground bonds used without degradation to sensitivity. see figure 6 and 7 for this low cost bonding option. d ecoupling for supply and rssi is recommended to be used on the optical host board. noise on the power supply can also be a result of coupling between the tia output and the power supply. this coupling takes place between the output bond wires and the power supply bond wi res. as a result these must also be kept as short as possible and be routed orthogonally to each other. the phy1095 provides alternative bonding options through the replication of some device inputs and outputs, allowing a variety of rosa pin outs to be realised without compromis ing performance. downloaded from: http:///
phy109 5- 01 -rd- 1. 1 datasheet page 8 6 mechanical specifications 6.1 to - can connections top- vie w: looking into the cd header. the diagrams below show an internal power supply decoupling capacitor and illustrate the optimum bondwire lengths and orientation. the value of the supply de - coupling capacitor should be 250 C 500 pf. vcc mon rx- rx+ photodiode capacitor pdc 1 pdc 2 pda gnd 1 gnd 2 rssi 1 vcc 1 vcc 2 rx- gnd 3 gnd 4 gnd 5 gnd 7 gnd 6 data_invert gnd 8 rx+ agc vcc 3 vcc 4 rssi 2 phy1095 figure 5 - 5 pin rosa with decoupling vcc gnd rx- rx+ photodiode pdc 1 pdc 2 pda gnd 1 gnd 2 rssi 1 vcc 1 vcc 2 rx- gnd 3 gnd 4 gnd 5 gnd 7 gnd 6 data_invert gnd 8 rx+ agc vcc 3 vcc 4 rssi 2 phy1095 vcc mon rx- rx+ photodiode pdc 1 pdc 2 pda gnd 1 gnd 2 rssi 1 vcc 1 vcc 2 rx- gnd 3 gnd 4 gnd 5 gnd 7 gnd 6 data_invert gnd 8 rx+ agc vcc 3 vcc 4 rssi 2 phy1095 figure 6 C low cost 4 pin rosa figure 7 C low cost 5 p in rosa downloaded from: http:///
phy109 5- 01 -rd- 1. 1 datasheet page 9 7 pad positions and sizes die size : 1100 m x 900 m thickness : 290 m +/ - 10 m pad opening : 80 m x 80 m measured between parallel sides number name pad centres x y 1 gnd 1 -439.5 221.5 2 pdc 1 -439.5 113 3 pda -412.5 0 4 pdc 2 -439.5 -113 5 gnd 2 -439.5 -221.5 6 rssi -320.095 -339.5 7 vcc 1 -219.5 -339.5 8 vcc 2 -121.5 -339.5 9 agc 55.09 -339.5 10 rx- 222.1 -339.5 11 gnd 3 321.5 -339.5 12 gnd 4 439.5 -221.5 13 gnd 5 439.5 -123.5 14 data_invert 439.5 0 15 gnd 6 439.5 123.5 16 gnd 7 439.5 221.5 17 gnd 8 321.5 339.5 18 rx+ 222.1 339.5 19 vcc 3 -121.5 339.5 20 vcc 4 -219.5 339.5 21 rssi_dir -320.095 339.5 table 1: phy109 5 pad coordinates figure 8 : phy109 5 die image downloaded from: http:///
phy1095 - 01 - rd - 1.1 datasheet page 10 maxim cannot assume responsibility for use of any circuitry other than circuitry enti rely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, inc. 160 rio robles, san j ose , ca 95134 usa 1 - 408 - 601 - 10 00 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. 8 contact information for technical support, contact maxim at www.maxim - ic.com/support . disclaimer this datasheet contains preliminary information and is subject to cha nge. this document does not transfer or license any intellectual property rights to the user. it does not imply any commitment to produce the device described and is intended as a proposal for a n ew device. phyworks ltd assumes no liability or warranty for infringement of patent, copyright or other intellectual property rights through the use of this product. phyworks ltd assumes no liability for fitness for particular use or claims arising from sale or use of its products. phyworks ltd products are not intended for use in life critical or sustai ning applications. downloaded from: http:///
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