preliminary information m2040 datasheet rev 0.5 revised 18nov2004 integrated circuit systems, inc. networking & communications www.icst.com tel (508) 852-5400 m2040 f requency t ranslation pll with a uto s witch integrated circuit systems, inc. g eneral d escription the m2040 is a vcso (voltage controlled saw oscillator) based clock generator pll designed for clock protection, frequency translation and jitter attenuation in fault tolerant computing applications. it features dual differential inputs with two modes of input selection: manual and automatic upon clock failure. the clock multiplication ratios and output divider ratio are pin selectable. external loop components allow the tailoring of pll loop response. f eatures integrated saw (surface acoustic wave) delay line; vcso frequency of 500.00 to 533.3334 mhz; * outputs vcso frequency or half; pin-configurable dividers loss of lock (lol) indicator output narrow bandwidth control input (nbw pin); initialization (init) input overrides nbw at power-up dual reference clock inputs support lvds, lvpecl, lv c m o s , lv t t l automatic (non-revertive) re ference clock reselection upon clock failure; controlled pll slew rate ensures normal system operation du ring reference reselection acknowledge pin indicates the actively selected reference input dual differential lvpecl outputs low phase jitter of < 0.5ps rms, typical (12khz to 20mhz or 50khz to 80mhz) industrial temperature available single 3.3v power supply small 9 x 9 mm smt (surface mount) package p in a ssignment (9 x 9 mm smt) figure 1: pin assignment * specify vcso center frequency at time of order. s implified b lock d iagram figure 2: simplified block diagram example input / output frequency combinations input (mhz) vcso * (mhz) output (mhz) 266.6667 500.00 250.00 500.00 533.3334 266.6667 533.3334 table 1: example input / output frequency combinations m2040 (top view) 18 17 16 15 14 13 12 11 10 28 29 30 31 32 33 34 35 36 1 2 3 4 5 6 7 8 9 fin_sel1 gnd auto dif_ref0 ndif_ref0 ref_sel dif_ref1 ndif_ref1 vcc p_sel init nfout0 fout0 gnd nfout1 fout1 vcc gnd fin_sel0 mr_sel ref_ack lol nbw vcc dnc dnc dnc nop_in op_out vc nvc nop_out op_in gnd gnd gnd 19 20 21 22 23 24 25 26 27 loop filter pll phase detector mr_sel fin_sel1:0 r div mux 0 ref_sel dif_ref0 ndif_ref0 1 mfin divider lut mfin divider m div fout0 nfout0 p divider p_sel nbw m / r divider lut dif_ref1 ndif_ref1 auto ref sel 0 1 lol phase detector ref_ack auto init lol fout1 nfout1 m2040 2 vcso m2040 frequency translation pll with autoswitch
m2040 datasheet rev 0.5 2 of 10 revised 18nov2004 integrated circuit systems, inc. networking & communications www.icst.com tel (508) 852-5400 integrated circuit systems, inc. m2040 f requency t ranslation pll with a uto s witch preliminary information p in d escriptions number name i/o configuration description 1, 2, 3, 10, 14, 26 gnd ground power supply ground connections. 4 9 op_in nop_in input external loop filter c onnections. see figure 5, external loop filter, on pg. 7. 5 8 nop_out op_out output 6 7 nvc vc input 11, 19, 33 vcc power power supply connection, connect to + 3.3 v. 12 13 fout1 nfout1 output no internal terminator clock output pair 1. differential lvpecl. 15 16 fout0 nfout0 output no internal terminator clock output pair 0. differential lvpecl. 17 init input internal pull-up resistor 1 note 1: for typical values of internal pull-down and pull-up resistors, see dc characteristics on pg. 8. power-on initialization; lvcmos/lvttl: logic 1 allows device to enter narrow mode if selected (in addition must have 8 lol=0 counts) logic 0 forced device into wide bandwidth mode. 18 p_sel internal pull-down 1 post-pll , p divider selection. lvcmos/lvttl. see table 5, p divider selector values and frequencies, on pg. 3. 20 ndif_ref1 input biased to vcc/2 2 note 2: biased to vcc/2, with 50k ? to vcc and 50k ? to ground. float if using dif_ref1 as lvcmos input. see dc characteristics on pg. 8. reference clock input pair 1. differential lvpecl/ lvds 21 dif_ref1 internal pull-down resistor 1 differential lvpecl/ lvds, or single ended lvcmos/ lvttl 22 ref_sel input internal pull-down resistor 1 referenc e clock input selection. lvcmos/lvttl. logic 1 selects dif_ref1/ndif_ref1 inputs logic 0 selects dif_ref0/ndif_ref0 inputs 23 ndif_ref0 input biased to vcc/2 2 reference clock input pair 0. differential lvpecl/ lvds 24 dif_ref0 internal pull-down resistor 1 differential lvpecl/ lvds, or single ended lvcmos/ lvttl 25 auto input internal pull-down resistor 1 automatic/manual reselection mode for clock input: logic 1 automatic reselection upon clock failure (non-revertive) logic 0 manual selection only (using ref_sel) 27 28 fin_sel1 fin_sel0 input internal pull-up resistor 1 i nput clock frequency selection. lvcmos/lvttl. (for fin_sel1:0 , see table 3 on pg. 3.) 29 mr_sel input internal pull-up resistor 1 m & r pll divider ratio selection. lvcmos/ lvttl. (for mr_sel , see table 4 on pg. 3.) 30 ref_ack output reference acknowledgement pin for input mux state; outputs the currently selected reference input pair: logic 1 indicates ndif_ref1, dif_ref1 logic 0 indicates ndif_ref0, dif_ref0 31 lol output loss of lock indicator output. 3 logic 1 indicates loss of lock. logic 0 indicates locked condition. note 3: see lvcmos outputs in dc characteristics on pg. 8. 32 nbw input internal pull-up resistor 1 narrow bandwidth enable. lvcmos/lvttl: logic 1 - narrow loop bandwidth , r in = 2100k ? . logic 0 - wide (normal) bandwidth , r in = 100k ? . 34, 35, 36 dnc do not connect. table 2: pin descriptions
m2040 datasheet rev 0.5 3 of 10 revised 18nov2004 integrated circuit systems, inc. networking & communications www.icst.com tel (508) 852-5400 m2040 f requency t ranslation pll with a uto s witch preliminary information integrated circuit systems, inc. d etailed b lock d iagram figure 3: detailed block diagram pll d ivider s election t ables mfin (frequency input) divider look-up table (lut) the fin_sel1:0 pins select the feedback divider value (?mfin?). m / r divider ratio look-up table (lut) the mr_sel pin selects the feedback and reference divider values m and r, respectively. post-pll divider the m2040 also features a post-pll (p) divider for the output clocks. it divides the vcso frequency to produce one of two selectable output frequencies (1/2 or 1/1 of the vcso frequency). that selected frequency appears on both clock output pairs. the p_sel pin selects the value for the p divider. phase locked loop (pll) m2040 saw delay line phase shifter vcso c post c post vc nvc r post nop_out op_out r post r loop r loop c loop c loop op_in nop_in pll phase detector loop filter amplifier external loop filter components mr_sel fin_sel1:0 r divider mux 0 ref_sel dif_ref0 ndif_ref0 1 mfin divider lut mfin divider m divider fout0 nfout0 p divider p_sel nbw r in r in m / r divider lut dif_ref1 ndif_ref1 auto ref sel 0 1 lol phase detector ref_ack auto init lol fout1 nfout1 2 fin_sel1:0 mfin value 11 1 10 4 01 8 00 32 table 3: mfin (frequency input) divider look-up table (lut) mr_sel m r description 03216 used when fin = 32/16 = 1/2 fvcso (e.g., fin= 266.6667mhz , fvcso= 533.3334mhz 1 ) note 1: fvcso= example 533.3334mhz in m2040-01-533.3334. 13016 used when fin = 30/16 = 0.53334 fvcso (e.g., fin= 266.6667mhz , fvcso= 500.0000mhz 2 ) note 2: fvcso= example 500.0000mhz in m2040-01-500.0000. table 4: m / r divider ratio look-up table (lut) p_sel p value m2040-533.3334 output frequency (mhz) 1 2 266.6667 0 1 533.3334 table 5: p divider selector values and frequencies
m2040 datasheet rev 0.5 4 of 10 revised 18nov2004 integrated circuit systems, inc. networking & communications www.icst.com tel (508) 852-5400 integrated circuit systems, inc. m2040 f requency t ranslation pll with a uto s witch preliminary information f unctional d escription the m2040 is a pll (phase locked loop) based clock generator that generates two output clocks synchronized to one of two selectable input reference clocks. an internal high ?q? saw delay line provides a low jitter clock output. the device is pin-configured for feedback divider and output divider values. output is lvpecl compatible. external loop filter component values set the pll bandwidth to optimiz e jitter attenuation characteristics. the device features dual differential inputs with two input selection modes: manual and automatic upon clock failure. (the differential inputs are internally configured for easy single-ended operation.) the m2040 includes: a loss of lock ( lol ) indicator, a reference mux state acknowledge pin ( ref_ack ), a narrow bandwidth control input pin ( nbw pin), and a power-on initialization ( init ) input (which overrides nbw= 0 to facilitate acquisit ion of phase lock). hitless switching (hs) is an optional feature that provides a controlled output clock phase change during a reference clock reselection. hs is triggered by a loss of lock detection by the pll. input reference clocks two clock reference inputs and a selection mux are provided. either reference clock input can accept a differential clock signal (such as lvpecl or lvds) or a single-ended clock input (lvcmos or lvttl on the non-inverting input). a single-ended reference clock on the unselected reference input can cause an increase in output clock jitter. for this reason, differential reference inputs are preferred; interference from a differential input on the non-selected input is minimal. configuration of a single-ended input has been facilitated by biasing ndif_ref0 and ndef_ref1 to vcc/2, with 50k ? to vcc and 50k ? to ground. the input clock structure, and how it is used with either lvcmos/lvttl inputs or a dc- coupled lvpecl clock, is shown in figure 4. figure 4: input reference clocks differential inputs differential lvpecl inputs are connected to both reference input pins in the usual manner. the external load termination resistors shown in figure 4 (the 127 ? and 82 ? resistors) is ideally suited for both ac and dc coupled lvpecl reference clock lines. these provide the 50 ? load termination and the vtt bias voltage . single-ended inputs single-ended inputs (lvcmos or lvttl) are connected to the non-inverting reference input pin ( dif_ref0 or dif_ref1 ). the inverting reference input pin ( ndif_ref0 or ndif_ref1 ) must be left unconnected. in single-ended operation, when the unused inverting input pin ( ndif_ref0 or ndef_ref1 ) is left floating (not connected), the input will self-bias at vcc/2. mux 0 ref_sel 1 vcc 50k 50k vcc 50k 50k lvcmos/ lvttl lvpecl 50k 50k vcc 82 127 vcc 82 127 x dif_ref0 ndif_ref0 dif_ref1 ndif_ref1 ? ? ? ? ? ? ? ? ? ?
m2040 datasheet rev 0.5 5 of 10 revised 18nov2004 integrated circuit systems, inc. networking & communications www.icst.com tel (508) 852-5400 m2040 f requency t ranslation pll with a uto s witch preliminary information integrated circuit systems, inc. pll operation the m2040 is a complete clock pll. it uses a phase detector and configurable dividers to synchronize the output of the vcso with the selected reference clock. the ?m? divider (and the ?mfin? divider) divides the vcso output frequency, feeding the result into the plus input of the phase detector. the frequency input (?mfin?) divider gives the device the capability to be adapted for use with other input frequencies. the output of the ?r? divider is fed into the minus input of the phase detector. the phase detector compares its two inputs. the phase detector output, filtered externally, causes the vcso to increase or decrease in frequency as needed to phase- and frequency-lock the vcso to the reference input. the value of m plus mfin directly affects closed loop bandwidth. the relationship between the nominal vcso center frequency (fvcso), the m divider, and the input reference frequency (fref_clk) is: the m, r, and mfin dividers can be set by pin configuration using the input pins mr_sel , fin_sel1, and fin_sel0 . p divider and outputs the m2040 provides two di fferential lvpecl output pairs: fout0 and fout1. one output divider (the ?p? divider) is used for both the fout0 and fout1 output pairs. by using the p divider, the output frequency can be the vcso frequency (fvcso) or 1/2 fvcso. the p_sel pin selects the value for the p divider: logic 1 sets p to divide-by- 2, logic 0 sets p to divide-by- 1 . see table 5 , p divider selector values and frequencies , on pg. 3. when the p divider is included, the complete relation- ship for the output frequency (fout) is defined as: loss of lock indicator output pin under normal device operation, when the pll is locked, lol remains at logic 0 . under circumst ances when the vcso cannot lock to the input (as measured by a greater than 4 ns discrepancy between the feedback and reference clock rising edges at the phase detector) the lol output goes to logic 1. the lol pin will return back to logic 0 when the phase detector error is less than 2 ns. the loss of lock indicator is a low current cmos output. narrow loop bandwidth control pin (nbw pin) a narrow loop bandwidth control pin ( nbw pin) is included to adjust the pll loop bandwidth. in normal (wide) bandwidth mode ( nbw = 0 ), the internal resistor rin is 100k ? . with the nbw pin asserted, the internal resistor rin is changed to 2100k ? . this lowers the loop bandwidth by a factor of about 21 (2100 / 100) and lowers the damping factor by about 4.6 (the square root of 21), assuming the same loop filter components. fvcso fref_clk mmfin r ------------------------- - = fout fvcso p ------------------- = fref_clk mmfin rp ------------------------- - =
m2040 datasheet rev 0.5 6 of 10 revised 18nov2004 integrated circuit systems, inc. networking & communications www.icst.com tel (508) 852-5400 integrated circuit systems, inc. m2040 f requency t ranslation pll with a uto s witch preliminary information automatic reference clock reselection this device offers an automatic reference clock reselection feature for switching input reference clocks upon a reference clock failure. with the auto input pin set to high and the lol output low, the device is placed into automatic reselection (autoswitch) mode. once in autoswitch mode, when lol then goes high (due to a reference clock fault), the input clock reference is automatically reselected internally, as indicated by the state change of the ref_ack output. automatic clock reselection is made only once (it is non-revertive). re-arming of automatic mode requires placing the device into manual selection (manual select) mode ( auto pin low) before returning to autoswitch mode ( auto pin high). using the autoswitch feature see also table 6, example autoswitch sequence. in application, the system is powered up with the device in manual select mode ( auto pin is set low), allowing sufficient time for the reference clock and device pll to settle. the ref_sel input selects the reference clock to be used in manual select mode and the initial reference clock used in autoswitch mode. the ref_sel input state must be maintained when switching to autoswitch mode ( auto pin high) and must still be maintained until a reference fault occurs. once a reference fault occurs, the lol output goes high and the input reference is automatically reselected. the ref_ack output always indicates the reference selection status and the lol output always indicates the pll lock status. a successful automatic resele ction is indicated by a change of state of the ref_ack output and a momentary level high of the lol output (minimum high time is 10ns). if an automatic reselection is made to a non-valid reference clock (one to which the pll cannot lock), the ref_ack output will change state but the lol output will remain high. no further automatic reselection is made; only one reselection is made each time the autoswitch mode is armed. autoswitch mode is re-armed by placing the device into manual select mode ( auto pin low) and then into autoswitch mode again ( auto pin high). following an automatic re selection and prior to selecting manual select mode ( auto pin low), the ref_sel pin has no control of reference selection. to prevent an unintential reference reselection, autoswitch mode must not be re-enabled until the desired state of the ref_sel pin is set and the lol output is low. it is recommended to delay the re-arming of autoswitch mode, following an automatic reselection, to ensure the pll is fully locked on the new reference. in most system configurations, where loop bandwidth is in the range of 100-1000 hz and damping factor below 10, a delay of 500 ms should be sufficient. until the pll is fully locked intermittent lol pulses may occur. example autoswitch sequence 0 = low; 1 = high. example with ref_sel initially set to 0 ( i.e., dif_ref0 selected) ref_sel selected clock input ref_ack auto lol conditions input output input output initialization 0 dif_ref0 0 0 1 device power-up. manual select mode . dif_ref0 input selected reference, not yet locked to. 0 dif_ref0 0 0 - 0 - lol to 0 : device locked to reference (may get intermittent lol pulses until fully locked). 0 dif_ref0 0 - 1 - 0 auto set to 1 : device placed in autoswitch mode ( with dif_ref0 as initial reference clock). operation & activation 0 dif_ref0 0 1 0 normal operation with autoswitch mode armed , with dif_ref0 as initial reference clock. 0 dif_ref0 0 1 - 1 - lol to 1 : clock fault on dif_ref0 , loss of lock indicated by lol pin, ... 0 -dif_ref1- - 1 - 1 1 ... and immediate automatic reselection to dif_ref1 ( indicated by ref_ack pin ) . 0 dif_ref1 1 1 - 0 - lol to 0 : device locks to dif_ref1 (assuming valid clock on dif_ref1). re-initialization - 1 - dif_ref1 1 1 0 ref_sel set to 1 : p repares for manual selection of dif_ref1 before then re-arming autoswitch. 1 dif_ref1 1 - 0 - 0 auto set to 0 : manual select mode entered briefly, manually selecting dif_ref1 as reference. 1 dif_ref1 1 - 1 - 0 auto set to 1 : device is placed in autoswitch mode (delay recommended to ensure device fully locked), re-initializing autoswitch with dif_ref1 now specified as the initial reference clock. table 6: example autoswitch sequence
m2040 datasheet rev 0.5 7 of 10 revised 18nov2004 integrated circuit systems, inc. networking & communications www.icst.com tel (508) 852-5400 m2040 f requency t ranslation pll with a uto s witch preliminary information integrated circuit systems, inc. hitless switching option hitless switching is a device option that can be specified at time of order. (please contact ics.) the m2040-01 remains in wide bandwidth mode if nbw = 0 . when nbw = 0 , placing the device into wide bandwidth operation, the optional hitle ss switching (hs) function will automatically place the device into narrow bandwidth operation during reference reselection. this provides a controlled output clock phase change while the pll is acquiring phase lock to a new reference clock phase. the hs function is trigged by a loss of lock event. wide bandwidth is resumed once the pll relocks to the input reference. (when the nbw pin = 1, the device operates in narrow bandwidth continually and hence the hs mode does not apply). the hs function is armed after the device locks to the input clock reference (8 successive phase detector clock cycles with lol low). once armed, hs is triggered by detection at the phase detector of a single phase error greater than 4 ns (rising edges). once triggered, the hs function narrows the loop band- width until the pll is locked to the selected reference (8 successive phase detector clock cycles with lol low). when pin auto = 1 (automatic reference reselection mode) hs is used in conjun ction with input reselection. when auto = 0 (manual m ode), hs will still occur upon an input phase transient, however the clock input is not reselected (this enables hitless switching when using an external mux for clock selection). power-up initialization function (init pin) the initialization function provides a short-term override of the narrow bandwidth mode when the device is powered up in order to facilitate phase locking. when init is set to logic 1 , initialization is enabled. with nbw set to logic 1 (narrow bandwidth mode), the initialization function puts the pll into wide bandwidth mode until eight consecutive phase detector cycles occur without a single lol event. once the eight valid pll locked states have occurred, the pll bandwidth is automatically reduced to narrow bandwidth mode. when init is logic 0 , the device is forced into wide bandwidth mode unconditionally. external loop filter the m2040 requires the use of an external loop filter components. these are connected to the provided filter pins (see figure 5). because of the differential signal path design, the implementation consists of two identical complementary rc filters as sh own in figure 5, below. figure 5: external loop filter pll bandwidth is affected by the total ?m? (feedback divider) value, loop filter component values, and other device parameters. see table 7, external loop filter component values, below. pll simulator tool available a free pc software utility is available on the ics website (www.icst.com). the m2000 timing modules pll simulator is a downloadable application that simulates pll jitter and wander transfer characteristics. this enables the user to set appropriate external loop component values in a given application. c post c post v c nvc r post nop_out op_out r post r loop r loop c loop c loop op_in nop_in 6 7 5 49 8 external loop filter component values 1 vcso parameters: k vco = 800khz/v, vco bandwidth = 700khz. see ac characteristics on pg. 9 for pll loop constants. device configuration external loop filter component values nbw mode 2 nominal performance using these values f ref (mhz) f vcso (mhz) m divider value r loop c loop r post c post pll loop bandwidth damping factor passband peaking (db) 266.6667 533.3334 30, 32 30 k ? 1.0 f 33 k ? 100 pf 1 110 hz 2.2 0.35 0 3 khz 10 0.02 table 7: external loop filter component values note 1: recommended values for hitless switching. for pll simulator software, go to www.icst.com. note 2: nbw mode 1 = narrow bandwidth, where r in = 2100 k ? . nbw mode 0 = wide bandwidth, where r in = 100 k ? .
m2040 datasheet rev 0.5 8 of 10 revised 18nov2004 integrated circuit systems, inc. networking & communications www.icst.com tel (508) 852-5400 integrated circuit systems, inc. m2040 f requency t ranslation pll with a uto s witch preliminary information e lectrical s pecifications a bsolute m aximum r atings 1 symbol parameter rating unit v i inputs - 0.5 to v cc + 0.5 v v o outputs - 0.5 to v cc + 0.5 v v cc power supply voltage 4.6 v t s storage temperature - 45 to + 100 o c table 8: absolute maximum ratings note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these ratings are stress s pecifications only. func tional operation of produc t at these conditions or any conditions beyond those li sted in recommended conditions of operation, dc characteristics, or ac characteristics is not implied. exposure to abs olute maximum rating condit ions for extended periods may affect product reliability . r ecommended c onditions of o peration symbol parameter min typ max unit v cc positive supply voltage 3.135 3.3 3.465 v t a ambient operating temperature commercial 0 + 70 o c industrial -40 + 85 o c table 9: recommended conditions of operation dc characteristics unless stated otherwise, v cc = 3.3 v + 5 %,t a = 0 o c to + 70 o c (commercial), t a = -40 o c to + 85 o c (industrial), f vcso = f out = 500-534 , lvpecl outputs terminated with 50 ? to v cc - 2v symbol parameter min typ max unit conditions power supply v cc positive supply voltage 3.135 3.3 3.465 v i cc power supply current 175 225 ma differential input: lvds / lvpecl v p - p peak to peak input voltage 1 note 1: single-ended measurement. see figure 7, differential input level on pg. 9. dif_ref, ndif_ref 0.15 v v cmr common mode input 1 0.5 v cc - 0 .85 v lvcmos / lvttl input v ih input high voltage ref_sel, mr_sel 2 v cc + 0.3 v v il input low voltage - 0.3 1.3 v inputs with pull-down i ih input high current dif_ref1, dif_ref0 150 a v cc = v in = 3.456v i il input low current - 5 a r pulldown internal pull-down resistor 51 k ? inputs with pull-up i ih input high current fin_sel1, fin_sel0, init, mr_sel 5 a v cc = 3.456v v in = 0 v i il input low current - 150 a r pullup internal pull-up resistor 51 k ? inputs biased to vcc/2 2 note 2: biased to vcc/2, with 50k ? to vcc and 50k ? to ground. ndif_ref1, ndif_ref0 (note 2) all inputs c in input capacitance all inputs 4 pf differential outputs v oh output high voltage fout1, nfout1 fout0, nfout0 v cc - 1.4 v cc - 1.0 v v ol output low voltage v cc - 2.0 v cc - 1.7 v v p - p peak to peak output voltage 3 note 3: single-ended measurement. see figure 6, input and output rise and fall time on pg. 9. 0.4 0.85 v lvcmos outputs v oh output high voltage, lock lol , ref_ack 2.4 v cc v i oh = 1 ma v ol output low voltage, lock gnd 0.4 v i ol = 1 ma table 10: dc characteristics
m2040 datasheet rev 0.5 9 of 10 revised 18nov2004 integrated circuit systems, inc. networking & communications www.icst.com tel (508) 852-5400 m2040 f requency t ranslation pll with a uto s witch preliminary information integrated circuit systems, inc. e lectrical s pecifications ( continued ) p arameter m easurement i nformation input and output rise and fall time figure 6: input and output rise and fall time differential input level figure 7: differential input level output duty cycle figure 8: output duty cycle ac characteristics unless stated otherwise, v cc = 3.3 v + 5 %,t a = 0 o c to + 70 o c (commercial), t a = -40 o c to + 85 o c (industrial), f vcso = f out = 500-534 , lvpecl outputs terminated with 50 ? to v cc - 2v symbol parameter min typ max unit conditions f in input frequency dif_ref1, ndif_ref1, dif_ref0, ndif_ref0 250 267 mhz f out output frequency fout1, nfout 1, fout0, nfout 0 500 534 mhz apr vcso pull-range commercial 120 200 ppm industrial 50 150 ppm pll loop constants 1 note 1: parameters needed for pll simulator software; see table 7, external loop filter component values, on pg. 7. k vco vco gain 800 khz/v r in internal loop resistor nbw = 0 100 k ? nbw = 1 2100 k ? bw vcso vcso bandwidth 700 khz phase noise and jitter n single side band phase noise @ 622.08 mhz 1 khz offset - 72 dbc/hz 10 khz offset - 94 dbc/hz 100 khz offset - 123 dbc/hz j(t) jitter (rms) 12 khz to 20 mhz 0.25 0.5 ps 50 khz to 80 mhz 0.25 0.5 ps odc output duty cycle 2 note 2: see parameter measurement information on pg. 9. f out =250/266mhz p = 2 (p_sel = 1) 45 50 55 % f out = 500/533mhz p = 1 (p_sel = 0) 40 50 60 % t r output rise time 2 for fout1, nfout1, fout0, nfout0 f out =250/266mhz p = 2 (p_sel = 1) 325 425 500 ps 20 % to 80 % f out = 500/533mhz p = 1 (p_sel = 0) 200 275 350 ps t f output fall time 2 for fout1, nfout1, fout0, nfout0 f out =250/266mhz p = 2 (p_sel = 1) 325 425 500 ps 20 % to 80 % f out = 500/533mhz p = 1 (p_sel = 0) 200 275 350 ps t lock pll lock time 100 ms table 11: ac characteristics 20% 80% t r 20% t f 80% clock inputs and outputs v p - p v cc - 0.85 ndif_clk dif_clk cross points v p-p v cmr + 0.5 nfout fout t pw t period (output pulse width) t period t pw odc =
preliminary information m2040 datasheet rev 0.5 10 of 10 revised 18nov2004 integrated circuit systems, inc. networking & communications www.icst.com tel (508) 852-5400 integrated circuit systems, inc. while the information presented herein has been checked for both accuracy and reliability, integrated circuit systems (ics) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which wou ld result from its use. no other circuits, patents, or licenses are implied. this product is intended for use in normal commercial applications. any other applications such as those requiring ex tended temperature range, high reliability, or other extraordina ry environmental requirements are not recommended without additional processing by ics. ics reserves the right to change any circuitry or specifications without notice. ics does not authorize or warrant any ics product for use in life support devices o r critical medical instruments. m2040 f requency t ranslation pll with a uto s witch d evice p ackage - 9 x 9mm smt c eramic mechanical dimensions: figure 9: device package - 9 x 9mm smt ceramic o rdering i nformation figure 10: ordering information consult ics for the availabilit y of other vcso frequencies. refer to the m2040 product web page at www.icst.com/product s/summary/m2040.htm for links to recommended pcb footprint, solder mask, furnace profile, and related information. example part numbers vcso freq (mhz) temperature part number 500.0000 commercial m2040-01 - 500.0000 industrial m2040-01 i 500.0000 533.3334 commercial m2040-01 - 533.3334 industrial m2040-01 i 533.3334 table 12: example part numbers part number: m2040- 01 - xxx.xxxx frequency (mhz) ? - ? = 0 to + 70 o c (commercial) consult ics for available vcso frequencies i = - 40 to + 85 o c (industrial) temperature
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