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general description the max4744/max4744h/max4745/max4745h/max4746h dual spdt (single-pole/double-throw) audio switches feature negative signal capability that allows signals as low as v cc - 5.5v to pass through without distortion. these analog switches have a low on-resis-tance and low supply current, and operate from a single +1.8v to +5.5v supply. the max4744/max4744h have internal shunt resistors that automatically discharge the capacitance at the nor- mally open (no) and normally closed (nc) terminals when they are not connected. the max4746h features internal shunt resistors on nc_ terminals. this reduces click-and-pop sounds that occur when switching audio signals between precharged points. a break-before- make feature further reduces popping. the max4744/ max4745 control the switches with two control bits cb1 and cb2. the max4744h/max4745h/max4746h have one control bit to switch both switches and an enable input en to put the switches in a high-impedance mode. the max4744h/max4745h/max4746h also have aninternal protection network against voltages applied to com_ when v cc = 0v. these devices are available in a space-saving 10-pin?fn (2mm x 2mm) package and operate over the -40? to +85? extended temperature range. applications speaker switchingpower routing cellular phones mp3 players pdas and other handheld devices notebook computers features ? distortion-free negative signal throughput downto v cc - 5.5v ? internal shunt resistor reduces click/pop(max4744/max4744h) ? 0.6 (typ) low on-resistance ? 0.1 (max) channel-to-channel matching ? 0.55 (max) on-resistance flatness ? +1.8v to +5.5v single-supply voltage ? 0.01% (typ) total harmonic distortion ? -75db (typ) crosstalk (100khz) ? -68db (typ) off-isolation (100khz) ? available in 10-pin dfn package (2mm x 2mm) max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability ________________________________________________________________ maxim integrated products 1 19-0563; rev 1; 11/06 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. 123 10 9 8 45 76 com1 v cc com2 nc1 cb1 cb2 gnd no1 max4744 max4745 dfn (2mm x 2mm) top view nc2 no2 123 10 9 8 45 76 com1 v cc com2 nc1 en cb0 gnd no1 max4744h max4745h max4746h dfn (2mm x 2mm) nc2 no2 + + pin configurations ordering information/selector guide part pin- package top mark clickless com protection pkg code max4744 elb+t 10 ?fn-10 +aaf yes no l1022-1 max4744h elb+t 10 ?fn-10 +aag yes yes l1022-1 max4745 elb+t 10 ?fn-10 +aah no no l1022-1 max4745h elb+t 10 ?fn-10 +aai no yes l1022-1 max4746h elb+t 10 ?fn-10 +aam yes, on nc_ yes l1022-1 note: all devices are specified over the -40? to +85? operating temperature range. + denotes a lead-free package. downloaded from: http:///
max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all voltages referenced to gnd.)v cc , cb_, en ........................................................-0.3v to +6.0v nc_, no_ ...........................................(v cc - 6v) to (v cc + 0.3v) com_ (max4744/max4745).............(v cc - 6v) to (v cc + 0.3v) com_ (max4744h/max4745h/max4746h) ..................(note 1) continuous current no_, nc_, com_. ..........................?00ma peak current no_, nc_, com_ (pulsed at 1ms, 50% duty cycle) ...................................................................?00ma peak current no_, nc_, com_ (pulsed at 1ms, 10% duty cycle) ...................................................................?00ma esd protection per method 3015.7no_, nc_, com_, v cc , gnd, cb_, en ...............................?kv continuous power dissipation (t a = +70?) 10-pin ?fn (derate 5mw/? above +70?) ...............403mw operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? electrical characteristics(v cc = +2.7v to +5.5v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc = 3.3v, t a = +25?.) (note 2) parameter symbol conditions min typ max units power supply supply-voltage range v cc 1.8 5.5 v v cc = 5.5v, v cb _ = 0v or v cc 0.3 1 v cc = 5.5v, v cb _ = 0.5v or 1.4v 8 supply current i cc v cc = 2.7v, v cb _ = 0.5v or 1.4v 4 ? analog switch analog signal range v nc _, v no _, v com _ (note 3) v cc - 5.5v v cc v t a = +25? 0.6 0.95 on-resistance (note 4) r on v cc = +2.7v; v nc_ or v no _ = v cc - 5.5v, -1v, 0v, 1v, 2v, v cc ; i com_ = 100ma t a = t min to t max 1.0 t a = +25? 0.1 on-resistance match betweenchannels (notes 4 and 5) r on v c c = 2.7v , v n c _ or v n o _ = 0v , i c om _ = 100m a t a = t min to t max 0.1 t a = +25? 0.55 on-resistance flatness (note 6) r flat v c c = + 2.7v , v n c _ or v n o _ = v c c - 5.5v , - 1v , 0v , 1v , 2v , v c c ; i c om _ = 100m a t a = t min to t max 0.6 shunt switch resistance r sh max4744/max4744h/max4746h only,v cc = 2.7v 25 k t a = +25? -15 +15 nc_, no_ off-leakage current(note 3) i no_(off), i nc_ ( off ) v c c = + 2.7v sw i tch op en; v n c _ or v n o _ = - 2.5v , + 2.5v ( m ax 4745/m ax 4745h onl y) ( m ax 4746h - i n o_ ( off ) onl y) t a = t min to t max -50 +50 na t a = +25? -15 +15 com_ on-leakage current(note 3) i com_ ( on ) v c c = 2.7v sw i tch cl osed ; v n c _ or v n o _ = - 2.5v , + 2.5v ; v c om _ = - 2.5v , + 2.5v t a = t min to t max -100 +100 na note 1: if v cc > 0.5v, limits are (v cc - 6v) to (v cc + 0.3v). if v cc < 0.5v, limits are (v cc - 6.0v) to +6.0v. downloaded from: http:///
max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability _______________________________________________________________________________________ 3 electrical characteristics (continued)(v cc = +2.7v to +5.5v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc = 3.3v, t a = +25?.) (note 2) parameter symbol conditions min typ max units t a = +25? 30 com_ leakage under protectionconditions i l ( prot ) v cc = 0v; v com _ = +5.5v; v nc _ and v no _ are unconnected or connected tognd; v cb _ = 0v (max4744h/max4745h/max4746h only) t a = t min to t max 500 na dynamic characteristics for n o_, v n o_ = 1.5v , v c b_ = 0v to v c c 55 turn-on time t on v c c = 2.7v , r l = 32 , c l = 35p f, fi g ur e 2 for n c _, v n c _ = 1.5v , v c b_ = v c c to 0v 560 ns for n o_, v n o_ = 1.5v , v c b_ = v c c to 0v 540 turn-off time t off v cc = 2.7v, r l = 32 , c l = 35pf, figure 2 for n c _, v n c _ = 1.5v , v c b_ = 0v to v c c 36 ns break-before-make delay time t d v cc = 2.7v, v nc _ = v no_ = 1.5v; for no_, v cb _ = v cc to 0v; for nc_, v cb _ = 0v to v cc ; r l = 32 ; c l = 35pf; figure 3 20 ns power-supply rejection ratio psrr f = 100khz, v com _ = 1v rms , r l = 50 , c l = 5pf 52 db charge injection q v gen _ = 0v; r gen = 0 , c l = 1nf, figure 4 450 pc off-isolation v iso c l = 5pf; r l = 50 ; f = 100khz; v com _ = 1v rms ; figure 5 (note 7) -68 db crosstalk v ct c l = 5pf; r l = 50 ; f = 100khz; v com _ = 1v rms ; figure 5 -75 db total harmonic distortion thd f = 20hz to 20khz, v com_ = 0.5v p-p , r l = 50 0.01 % no_, nc_ off-capacitance c no_(off), c nc_ ( off ) f = 1mhz, figure 6 90 pf com on-capacitance c com_ ( on ) f = 1mhz, figure 6 300 pf downloaded from: http:///
max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability 4 _______________________________________________________________________________________ electrical characteristics (continued)(v cc = +2.7v to +5.5v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc = 3.3v, t a = +25?.) (note 2) parameter symbol conditions min typ max units digital inputs (cb_, en ) input-logic high v ih 1.4 v input-logic low v il 0.5 v input leakage current i leak v cb _ or v en = 0v or v cc -1 +1 ? note 2: all parameters are production tested at t a = +25? and guaranteed by design over the specified temperature range. note 3: signals on com_, no_, or nc_ exceeding v cc are clamped by internal diodes. limit forward-diode current to maximum current ratings. note 4: guaranteed by design; not production tested. note 5: r on = r on(max) - r on(min) . note 6: flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over thespecified analog signal ranges. note 7: off-isolation = 20log 10 [v com_ / v no_ ], v com_ = output, v no_ = input to off switch. typical operating characteristics (v cc = +3.3v, t a = +25?, unless otherwise noted.) 0 0.6 1.2 1.8 2.4 3.0 -4 -1 0 -3-2 12345 on-resistance vs. com voltage max4744 toc01 com voltage (v) on-resistance ( ) v cc = +1.8v v cc = +3v v cc = +5v 0.1 0.2 0.40.3 0.5 0.6 -2.5 -0.3 -1.4 0.8 1.9 3.0 on-resistance vs. com voltage max4744 toc02 com voltage (v) on-resistance ( ) t a = +85 c t a = +25 c t a = -40 c v cc = 3v 0 0.1 0.30.2 0.4 0.5 -0.5 1.7 0.6 2.8 3.9 5.0 on-resistance vs. com voltage max4744 toc03 com voltage (v) on-resistance ( ) t a = +85 c t a = +25 c t a = -40 c v cc = 5v downloaded from: http:///
max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability _______________________________________________________________________________________ 5 300 400 600500 700 800 nc_ turn-on/no_ turn-off time vs. supply voltage max4744 toc04 supply voltage (v) time (ns) 1.8 3.8 2.8 4.8 nc_ turn-on time no_ turn-off time 5.5 20 40 60 80 100 120 140 1.8 2.8 2.3 3.3 3.8 4.3 4.8 5.3 no_ turn-on/nc_ turn-off time vs. supply voltage max4744 toc05 supply voltage (v) time (ns) no_ turn-on time nc_ turn-off time 0 40 80 120 160 200 240 -40 -10 -25 5 20 35 50 65 80 no_ turn-on/nc_ turn-off time vs. temperature max4744 toc06 temperature ( c) turn-on/turn-off time (ns) no_ t on nc_ t off 400 500 600 700 800 900 -40 -10 -25 5 20 35 50 65 80 no_ turn-on/nc_ turn-off time vs. temperature max4744 toc07 temperature ( c) turn-on/turn-off time (ns) nc_ t on no_ t off 0 0.4 1.20.8 1.6 2.0 1.8 3.4 2.6 4.2 5.0 logic threshold vs. supply voltage max4744 toc08 supply voltage (v) logic threshold (v) v cb_ rising v cb_ falling 5.5 0 0.3 0.90.6 1.2 1.5 supply current vs. logic-input voltage max4744 toc09 digital input voltage (v) supply current ( a) 0 2.0 1.0 3.0 0.5 1.4 0 200 600400 800 1000 00 . 2 0.1 0.3 0.4 0.5 com protection leakage current vs. supply voltage max4744 toc10 supply voltage (v) com protection leakage current (na) t a = +85 c t a = +25 c t a = -40 c 200 400300 600500 700 800 1.8 3.8 2.8 4.8 charge injection vs. supply voltage max4744 toc11 supply voltage (v) charge injection (pc) 5.5 typical operating characteristics (v cc = +3.3v, t a = +25?, unless otherwise noted.) downloaded from: http:///
max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability 6 _______________________________________________________________________________________ -40-80 -50-60 -70 0.001 0.01 10 100 off-isolation vs. frequency max4744 toc14 frequency (mhz) off-isolation (db) 0.1 1 0 -100 -20-40 -60 -80 0.001 0.01 10 100 crosstalk vs. frequency max4744 toc15 frequency (mhz) crosstalk (db) 0.1 1 0.01 1 0.1 10 100 total harmonic distortion vs. frequency max4744 toc16 frequency (khz) thd (%) 1 0.001 0.1 0.01 80 0 6040 20 power-supply rejection ratio vs. frequency max4744 toc17 frequency (mhz) psrr (db) 0.001 0.1 1 0.01 typical operating characteristics (continued) (v cc = +3.3v, t a = +25?, unless otherwise noted.) 1000 100 10 1.00.1 -40 10 -15 35 60 85 leakage current vs. temperature max4744 toc12 temperature ( c) leakage current (na) on off 0 -6 0.001 1 10 0.1 0.01 100 frequency response max4744 toc13 frequency (mhz) on-loss (db) -5 -4 -3 -2 -1 downloaded from: http:///
detailed description the max4744/max4744h/max4745/max4745h/max4746h are low on-resistance, low-voltage, dual- spdt analog switches that operate from a +1.8v to +5.5v single supply. these devices feature a negative signal capability that allows signals as low as v cc - 5.5v to pass through without distortion.the max4744/max4745 feature two digital control bits to control each switch independently (see table 1). the max4744h/max4745h/max4746h have one control bit to switch both switches and an enable input en to put the switches in a high-impedance mode. driving en low takes the switches out of high impedance and cb0controls both switches (see table 2). the max4744/max4744h have internal shunt resistors on all no and nc terminals, and the max4746h has internal shunt resistors on nc terminals to suppress click-and-pop sounds that can occur when switching audio signals between precharged points. applications information digital control inputs the max4744/max4744h/max4745/max4745h/max4746h logic inputs accept up to +5.5v, regardless of supply voltage. for example, with a +3.3v supply, cb0, cb1, cb2, and en can be driven low to gnd and high to +5.5v, allowing for mixed logic levels in a sys-tem. driving cb0, cb1, cb2, and en rail-to-rail mini- mizes power consumption. max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability _______________________________________________________________________________________ 7 pin description pin max4744/ max4745 max4744h/max4745h/ max4746h name function 1 cb1 digital control input for analog switch 1 ? en enable input. driving en high causes all switches to be high impedance. pull en low for normal operation. 2 2 no1 analog switch 1?ormally open terminal 3 3 gnd ground 4 4 no2 analog switch 2?ormally open terminal 5 cb2 digital control input for analog switch 2 5 cb0 digital control input for analog switches 1 and 2 6 6 com2 analog switch 2?ommon terminal 7 7 nc2 analog switch 2?ormally closed terminal 88v cc positive supply voltage from +1.8v to +5.5v 9 9 nc1 analog switch 1?ormally closed terminal 10 10 com1 analog switch 1?ommon terminal control switch state cb1 cb2 switch 1 switch 2 0 0 connected to nc1 connected to nc2 0 1 connected to nc1 connected to no2 1 0 connected to no1 connected to nc2 1 1 connected to no1 connected to no2 table 1. max4744/max4745 truth table control switch state en cb0 switch 1 switch 2 0 0 connected to nc1 connected to nc2 0 1 connected to no1 connected to no2 1 x high impedance high impedance table 2. max4744h/max4745h/max4746htruth table x = don? care downloaded from: http:///
max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability 8 _______________________________________________________________________________________ cb1cb2 gnd nc1 v cc com1 com2 no1 no2 nc2 en cb0 gnd nc1 com1 com2 no1 no2 nc2 switch 1 switch 2 switch 1 switch 2 cb1cb2 gnd nc1 com1 com2 no1 no2 nc2 cb0 gnd nc1 com1 com2 no1 no2 nc2 high-z high-z high-z high-z high-z high-z shunt switch shunt switch control logic v cc control logic switch 1 switch 2 v cc en v cc max4744 max4744h cb0 gnd no1 com1 com2 nc1 no2 nc2 shunt switch control logic switch 1 switch 2 v cc en max4746h max4745h max4745 switch 1 switch 2 figure 1. functional diagram downloaded from: http:///
analog signal levels these devices pass signals from v cc to as low as v cc - 5.5v, including signals below ground with minimal distortion and very little change in on-resistance (see the typical operating characteristics ). the switches are bidi- rectional, so the no_, nc_, and com_ terminals can beused as either inputs or outputs. com_ protection with v cc = 0v (max4744h/max4745h/max4746h) this feature prevents any damage to the device due toimproper power-supply sequencing. the protection applies if a signal is applied on com_ when v cc is less than 0.5v. the switch is not protected if v cc goes above 0.5v due to parasitic capacitive coupling or any leakage between com_ and v cc . the signal at com_ ranges between (v cc - 6.0v) to 6.0v under protection conditions. click-and-pop suppression the max4744/max4744h have a shunt resistor on alltheir no and nc terminals to automatically discharge any capacitance when they are not connected to com. the shunt resistor reduces audible click-and-pop sounds that occur when switching between audio sources. audible clicks and pops are caused when a step dc voltage is switched into the speaker. the dc step transients can be reduced by automatically dis- charging the side that is not connected to the com ter- minal, reducing any residual dc voltage and reducing clicks and pops. max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability _______________________________________________________________________________________ 9 t r < 5ns t f < 5ns 50% 0v logic input r l com_ gnd cb_ c l includes fixture and stray capacitance v out = v n_ ( r l ) r l + r on v nc_ or v no_ v cc t off 0v no_ or nc_ 0.8 x v 0ut 0.2 x v out t on v out switch output logic input in depends on switch configuration;input polarity determined by sense of switch. v cc c l v cc v out max4744/max4745/ max4744h/max4745h/ max4746h figure 2. switching time 50% v cc 0v logic input v out 0.9 x v out t bbm logic input r l gnd c l includes fixture and stray capacitance no_ cb_ nc_ v out v cc v cc c l com_ max4744/max4745/ max4744h/max4745h/ max4746h v nc_ = v no_ figure 3. break-before-make interval test circuits/timing diagrams downloaded from: http:///
break-before-make switching all devices feature break-before-make switching, whichis configured to break (open) the first set of contacts before engaging (closing) the new contacts. this pre- vents the momentary connection of the old and new sig- nal paths to the output, reducing click-and-pop sounds. power-supply sequencing and overvoltage protection caution: do not exceed the absolute maximumratings since stresses beyond the listed ratings may cause permanent damage to the device. proper power-supply sequencing is recommended for all cmos devices. improper supply sequencing can force the switch into latch-up, causing it to draw exces- sive supply current. the only way out of latch-up is to recycle the power and reapply properly. connect all ground pins first, then apply power to v cc , and finally apply signals to no_, nc_, and com_. follow thereverse order upon power-down. max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability 10 ______________________________________________________________________________________ gnd nc_ or no_ c l v out v cc v out cb_ off on off v out q = ( v out )(c l ) com_ logic input waveforms inverted for switchesthat have the opposite logic sense. off on off cb_ v il to v ih v cc cb_ max4744/max4745/ max4744h/max4745h/ max4746h figure 4. charge injection v cc gnd v cc com_ no_ measurements are standardized against short and open at socket terminals. off-isolation is measured between com_ and off no_ or nc_ terminals. on-loss is measured between com_ and on no_ or nc_ terminal on each switch. crosstalk is measured from one channel to the other channel. signal direction through switch is reversed; worst values are recorded. nc_ 10nf v in v out network analyzer 50 50 50 50 meas ref max4744 max4744hmax4746h cb_ 0v or v cc off-isolation = 20log off-loss = 20log crosstalk = 20log v in v out v in v out v in v out figure 5. off-isolation, on-loss, and crosstalk test circuits/timing diagrams downloaded from: http:///
max4744/max4744h/max4745/max4745h/max4746h max4744/max4744h/max4745/max4745h/max4746h ______________________________________________________________________________________ 11 gnd v il or v ih nc_ orno_ com_ max4744 max4744h max4745 max4745hmax4746h v cc capacitance analyzer cb_ 10nf f = 1mhz figure 6. channel off-/on-capacitance cb1 cb2 nc1 no1 nc2 no2 com1 com2 maxim directdrive audio amp audio shuntswitch max4744 typical operating circuit chip information process: bicmos low-voltage, dual spdt, audio clickless switches with negative rail capability ______________________________________________________________________________________ 11 downloaded from: http:///
max4744/max4744h/max4745/max4745h/max4746h low-voltage, dual spdt, audio clickless switches with negative rail capability maxim cannot assume responsibility for use of any circuitry other than circuitry entirely 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. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2006 maxim integrated products is a registered trademark of maxim integrated products, inc. package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) 6, 8, 10l udfn.eps even terminal l c odd terminal l c l e l a e e d pin 1 index area b e a b n solder mask coverage a a 1 pin 10.10x45 l l1 (n/2 -1) x e) xxxxxxxx xxxx sample marking a1 a2 7 a 1 2 21-0164 package outline,6, 8, 10l udfn, 2x2x0.80 mm -drawing not to scale- common dimensions symbol min. nom. a 0.70 0.75 a1 d 1.95 2.00 e 1.95 2.00 l 0.30 0.40 pkg. code n e b package variations l1 6 l622-1 0.65 bsc 0.300.05 0.250.05 0.50 bsc 8 l822-1 0.200.03 0.40 bsc 10 l1022-1 2.05 0.80 max. 0.50 2.05 0.10 ref. (n/2 -1) x e 1.60 ref. 1.50 ref. 1.30 ref. a2 - -drawing not to scale- a 2 2 21-0164 package outline,6, 8, 10l udfn, 2x2x0.80 mm 0.15 0.20 0.25 0.020 0.025 0.035 cardenas downloaded from: http:///

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