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1 zarlink semiconductor inc. zarlink, zl and the zarlink semiconductor logo are trademarks of zarlink semiconductor inc. copyright 2003-2006, zarlink semiconductor inc. all rights reserved. features ? very high operating speed ? operation down to dc with square wave input ? low phase noise (typically better than -146 dbc/hz at 10 khz) ? 5 v single supply operation ? low power dissipation: 510 mw (typ) ? surface mount plastic package with exposed pad (see application notes) applications ? dc to 10 ghz pll applications ? hyperlan ?lmds ? instrumentation ? satellite communications ? fibre optic communications; oc48, oc192 ? ultra low jitter clock systems description the zl40815 is one of a range of 5 v supply, very high speed, low power prescalers for professional applications with a fixed m odulus of divide by 4. the dividing elements are static d type flip flops, and therefore, allow operation down to dc if the drive signal is a pulse waveform with fast risetimes. the output stage has internal 50 ohm pull up giving a 1 v p-p output. see application notes for more details march 2006 ordering information zl40815dce 8 pin sop/soic tubes, bake & drypack zl40815dcf 8 pin sop/soic tape & reel, bake & drypack zl40815dcf1 8 pin sop/soic* tape & reel, bake & drypack ZL40815DCE1 8 pin sop/soic* tubes, bake & drypack *pb free matte tin -40 c to +85 c zl40815 10ghz fixed modulus 4 data sheet figure 1 - block diagram vref div 4 20ma 50 ohm 400 ohm vcc in vcc out output output b input input b gnd gnd 1 2 3 4 8 7 6 5
zl40815 data sheet 2 zarlink semiconductor inc. pin connections - top view applications configuration figure 2 shows a recommended applicatio n configuration. this example shows the devices set up for single ended operation. figure 2 - recommended circuit configuration the above circuit diagram shows some components in do tted lines. these are optional in many applications. 1. c1 (10 f) and c2 (10 nf) power supply decoupling capacitors may be available on the board already. 2. r3 (100 ohm) and c8 (10 nf) can be included if furthe r power supply decoupling is required for the first stage biasing circuit. this may optimize the noise and jitter pe rformance. the values are suggestions and may have to be modified if the existing supp lies are particularly noisy. 3. r1 (50 ohm), in series with c5 (100 pf), may reduce feedthrough of the input signal to the output. 4. r2 (50 ohm) and c7 (10 nf) will help to balance the cu rrent drawn from the power supply and may reduce volt- age transients on the power supply line. vcc input input input b gnd vcc output output output b gnd 1 2 3 4 5 6 7 8 soic (n) e-pad 1 8 7 2 3 6 5 4 c2:10nf c4:100pf c5:100pf c6:10nf c7:10nf vcc 5v example configuration for single ended operation c1:10uf r2:50ohm r1:50ohm c3:100pf r3:100ohm c8:10nf
zl40815 data sheet 3 zarlink semiconductor inc. evaluation boards from zarlink semiconductor zarlink semiconductor provides prescaler evaluation boards . these are primarily for those interested in performing their own assessment of the operation of the pre scalers.the boards are supplied unpopulated and may be assembled for single ended or differential input and output operation, type no . zle40008. fully populated evaluation boards are also available, ty pe no. zle40810. once assembled, all that is required is an rf source and a dc supply for operation. the inputs and outp uts are connected via si de launch sma connectors. ac/dc electrical characteristics note 1: input sensitivity and output power values assume 50 ohm source and load impedances. ? the following characterization test method incremented the amplitude over the entire range of frequency and ensures that there are no "holes" in the characteristic. ? the following characteristics are guaranteed by either production test or design. absolute maximum ratings parameter symbol min. max. units 1 supply voltage vcc 6.5 v 2 prescaler input voltage 2.5 (vdd_io+5%) vp-p 3 esd protection (static discharge) 2k v 4 storage temperature t st -65 +150 c 5 maximum junction temp t j max +125 c 6 thermal characteristics th ja 58.6 c/w multi-layer pcb electrical ch aracteristics (tamb = 25c, vcc = 5v) ? characteristic pin min. typ. max. units conditions supply current 1 0.35 ma input stage bias current supply current 8 102 130 ma divider and output stages input frequency 2,3 2 11 ghz rms sinewave (see note 1) input sensitivity 2,3 -8 dbm fin = 1 ghz to 2 ghz input sensitivity 2,3 -15 -10 dbm fin = 2 ghz to 9.5 ghz input sensitivity 2,3 -10 0 dbm fin = 11 ghz input overload 2,3 8 dbm fin = 1 ghz to 4 ghz input overload 2,3 11 dbm fin = 5 ghz to 11 ghz input edge speed 2,3 900 v/s for <2 ghz operation. output voltage 6,7 1 vp-p differential into 50 ohm pullup resistors output power 6,7 -3 -1 1.2 dbm single-ende d output, fin = 2 ghz to 10 ghz, pwr ip= -10 dbm phase noise (10khz offset) 6,7 -146 dbc/hz fin = 5 ghz, pwr ip = 0 dbm see figure 7 and figure 8. o/p duty cycle 6,7 45 50 55 %
zl40815 data sheet 4 zarlink semiconductor inc. figure 3 - input sensitivity @ +25 c note 1: pin 1 is the vcc pin for the 1 st stage bias current. in some applications e.g., if the power supply is noisy, it may be advantageous to add further supply decoupling to this pin (i.e., an additional r, c filter, see diagram of the recommended circuit configuration, figure 9). ? the characteristics are guaranteed by design and characterisation over the range of operating conditions unless otherwise stat ed: ? (input frequency range 1 to 10 ghz rms sinewave) electrical characteristics (vcc = 5v 5%, tamb = -40 to +85c) ? characteristic pin min. typ. max. units conditions supply current 1 0.35 ma input stage bias current (see note 1) supply current 8 73 102 131 ma -40c 5.25 v supply current 8 59 83 106 ma -40c 4.75 v supply current 8 81 112 142 ma +25c 5.25 v supply current 8 65 91 116 ma +25c 4.75 v supply current 8 87 121 156 ma +85c 5.25 v supply current 8 67 96 125 ma +85c 4.75 v or more typical input sensitivity (sinewave drive) @ +25 deg c -40.00 -30.00 -20.00 -10.00 0.00 10.00 20.00 012345678910111213 input frequency (ghz) vin into 50 ohm (dbm) 25c max ( typ) guaranteed operating window input frequency extends to dc if the source has an edge speed of 900 v/us or less
zl40815 data sheet 5 zarlink semiconductor inc. note 1: input sensitivity and output power values assume 50 ohm source and load impedances. ? input sensitivity and output power values assume 50 ohm source and load impedances. for details of the test set-up, refer to the application note for rf prescalers. the following graph summarizes the inpu t and output characteristics table. figure 4 - input sensitivity @ -40, +25, +70 and +85 c input and output characteristics ? characteristic pin min. typ. max. units conditions input sensitivity 2,3 -15 -10 dbm tamb = 85c, fin = 2 to 8 ghz input overload 2,3 2 5 dbm fin = 2 ghz input overload 2,3 2 8 dbm fin = 4 ghz input overload 2,3 5 13 dbm fin = 9 ghz input overload 2,3 5 11 dbm fin = 10 ghz input edge speed 2,3 900 v/s for <2ghz operation, see note 1 output voltage 6,7 1 vp-p differenti al into 50 ohm pullup resistors output power 6,7 -4 -1 2 dbm single-ended output, fin = 2 ghz to 10ghz, pwr ip= -10dbm o/p duty cycle 6,7 45 50 55 % trise and tfall 6,7 110 ps or more typical input sensitivity (sinewave drive) @ -40 to +85 deg c -40.00 -30.00 -20.00 -10.00 0.00 10.00 20.00 012345678910111213 input frequency (ghz) vin into 50 ohm (dbm) 85c 70 25c -40c max (typ) guaranteed operating window 85 deg c 70 deg c 25 deg c input frequency extends to dc if the source has an edgespeed of 900 v/us or less
zl40815 data sheet 6 zarlink semiconductor inc. phase noise measurement graphs figure 5 - zl40815 phase noise vs offset frequency figure 6 - zl40815 phase noise vs input frequency zl40815 phase noise vs offset pin = 0dbm, vcc = 5.25v, temp = 25degc -150 -145 -140 -135 -130 0.1 1 10 100 offset frequency (khz) phase noise (dbc/hz) 5ghz 2ghz zl40815 phase noise vs input frequency pin = 0dbm, vcc = 5.25v, temp = 25 degc -150 -145 -140 -135 -130 0123456 input frequency (ghz) phase noise (dbc/hz) 100hz 1khz 10khz 100khz
zl40815 data sheet 7 zarlink semiconductor inc. single ended output power the following graphs show how the output power varies with supply. differential output power will be 3 db. figure 7 - pout, freq, temp @ vcc = 4.75 v zl8015_dev1_pout_frequency_sweep, vcc = 4.75v -6 -5 -4 -3 -2 -1 0 1 2 1000000000 10000000000 i/p frequency (hz) o/p level (dbm) device 1,temperature = -40c device 1,temperature = 25c device 1,temperature = 85c
zl40815 data sheet 8 zarlink semiconductor inc. figure 8 - pout, freq, temp @ vcc = 5 v frequency_sweep, vcc = 5v -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 1000000000 10000000000 i/p frequency (mhz) o/p level (dbm) device 1,temperature = -40c device 1,temperature = 25c device 1,temperature = 85c
zl40815 data sheet 9 zarlink semiconductor inc. figure 9 - pout, freq, temp @ vcc = 5.25 v zl40815_pout_frequency_sweep, vcc = 5.25v -6 -5 -4 -3 -2 -1 0 1 2 1000000000 10000000000 i/p frequency (hz) o/p level (dbm) device 1,temperature = -40c device 1,temperature = 25c device 1,temperature = 85c
zl40815 data sheet 10 zarlink semiconductor inc. figure 10 - input impedance of 10 ghz prescalers figure 11 - input impedance of 10 ghz prescalers (typical) 10ghz prescaler input impedance, vcc=5v -50 -40 -30 -20 -10 0 10 20 30 40 50 2345678910 frequency (ghz) ohms real image 10ghz prescaler input impedance, vcc=5v -50 -40 -30 -20 -10 0 10 20 30 40 50 2345678910 frequency (ghz) ohms real image
zl40815 data sheet 11 zarlink semiconductor inc. oscillographs of the di vider output waveforms the following oscillographs show that the low-level feedthrough of the i nput waveform can be further reduced by summing the two output pins of the device differ entially, refer to figure 12 and figure 13. figure 12 - feedthrough of the input single-ended-output configuration vcc = 5 v, vin = 2 dbm, fin = 10 ghz figure 13 - feedthrough of the input using differential output configuration vcc = 5 v, vin = 2 dbm, fin = 10 ghz
zl40815 data sheet 12 zarlink semiconductor inc. figure 14 and figure 15 show the output waveforms with a lower input frequency. figure 14 - differential output with small input amplitude waveform vcc = 4.75 v, vin = 10 dbm, fin = 5 ghz figure 15 - differential output with lower frequency input vcc = 4.75 v, vin = 10 dbm, fin = 2 ghz
c zarlink semiconductor 2003 all rights reserved. apprd. issue date acn package code previous package codes
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