general description the max4991?ax4994 low on-resistance analog switches operate from a single +1.8v to +5.5v supply. the max4991/max4993 feature a slow turn-on time to reduce clicks and pops due to coupling capacitors and audio amplifiers with a dc output bias. this feature pro- vides click-and-pop reduction without adding additional parts for existing architectures. the max4991/MAX4992 are dual single-pole/double- throw (spdt) switches, while the max4993/max4994 are double-pole/double-throw (dpdt) switches. the max4993/max4994 feature an active-low enable input ( en ) that sets all the channels to high impedance and reduces supply current when driven high. these devices have 0.3 on-resistance and 0.004% thd+n to route high fidelity audio signals. the max4991?ax4994 are available in space-saving 10-pin utqfn (1.4mm x 1.8mm) package, and are specified for operation over the -40? to +85? extend- ed temperature range. applications speaker headset source switching cellular phones portable mp3 players audio signal routing features ? slow turn-on for click-and-pop reduction without additional parts ? low 0.3 on-resistance ? low r on flatness (1m ) ? low thd+n: 0.004% ? +1.8v to +5.5v single-supply operation ? 1.2? (typ) supply current ? space-saving packages 10-pin utqfn (1.4mm x 1.8mm x 0.55mm) max4991?ax4994 low r on , dual-spdt/single-dpdt analog switches with slow turn-on time ________________________________________________________________ maxim integrated products 1 ordering information/selector guide 19-4150; rev 1; 6/09 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. note: all devices operate over -40? to +85? extended temperature range. + denotes a lead(pb)-free/rohs-compliant package. * future product?ontact factory for availability. part pin-package configuration slow-switching time enable line top mark max4991 evb+* 10 utqfn dual spdt yes no aad MAX4992 evb+ 10 utqfn dual spdt no no aae max4993 evb+ 10 utqfn dpdt yes yes aaf max4994 evb+* 10 utqfn dpdt no yes aag typical application circuit appears at end of data sheet. top view 5 4 3 8 9 10 max4993/ max4994 7 6 1 2 nc1 cb com1 no2 com2 utq fn gnd nc2 no1 v cc en 5 4 3 8 9 10 max4991/ MAX4992 7 6 1 2 nc1 cb1 com1 no2 com2 cb2 utq fn gnd nc2 no1 v cc pin configurations
max4991?ax4994 low r on , dual-spdt/single-dpdt analog switches with slow turn-on time 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +2.7v to +5.5v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc = +3.0v, t a = +25?.) (note 2) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (voltages referenced to gnd.) v cc , cb_, en ........................................................-0.3v to +6.0v com_, nc_, no_ ...................................... -0.3v to (v cc + 0.3v) continuous current com_, nc_, no_ ...........................?50ma peak current com_, nc_, no_ (pulsed at 1ms, 50% duty cycle)..........................................................?00ma peak current com_, nc_, no_ (pulsed at 1ms, 10% duty cycle)..............................................................?.5a continuous power dissipation (t a = +70?) 10-pin utqfn (derate 6.9mw/? above +70?).........559mw junction-to-case thermal resistance ( jc ) (note 1) 10-pin utqfn ...........................................................20.1?/w junction-to-ambient thermal resistance ( ja ) (note 1) 10-pin utqfn .........................................................143.1?/w operating temperature range ...........................-40? to +85? junction temperature range ..........................................+150? storage temperature range ............................ -65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units power-supply range v cc 1.8 5.5 v undervoltage lockout v uvlo 1.4 v v cc = +3v 1.2 2.5 v cb1 = v cb2 = 0v or v cc v cc = +5.5v 3.1 6 v cc = +2.7v 3 supply current (max4991/MAX4992) i cc v cb1 = v cb2 = +0.5v or +1.4v v cc = +5.5v 14 a v en = v cc , v cb = 0v or v cc v cc = +5.5v 0.1 1 v cc = +3v 1.2 2.5 v en = 0v, v cb = 0v or v cc v cc = +5.5v 3.1 6 v cc = +2.7v 3 supply current (max4993/max4994) i cc v en = v cb = +0.5v or +1.4v v cc = +5.5v 8.5 a power-supply rejection ratio psrr r l = r s = 50 , f = 20khz 80 db analog signal range v nc_ , v no_ , v com_ 0 v cc v t a = +25c 0.3 0.5 on-resistance r on v cc = +2.7v, v nc_ or v no_ = 0 to v cc , i com_ = 100ma t a = t min to t max 0.6 on-resistance match between channels r on v cc = +2.7v, between nc_, no_ only, i com_ = 100ma, v nc_ or v no_ = v cc /2 3 m on-resistance flatness r flat v cc = +2.7v, v nc_ or v no_ = 0 to v cc , i com_ = 100ma (note 3) 1 m f = 20hz to 20khz 1 com_ output noise n com_ v nc_ = v no_ = 0v, r l = 50 f = 0hz to 1mhz 50 v rms note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a 4-layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial .
max4991?ax4994 low r on , dual-spdt/single-dpdt analog switches with slow turn-on time _______________________________________________________________________________________ 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 = +3.0v, t a = +25?.) (note 2) parameter symbol conditions min typ max units nc_, no_, off-leakage current i l(off) v cc = +2.7v, switch open, v nc_ or v no_ = 0v or v cc , v com_ = v cc or 0v -100 +100 na com_ off-leakage current (max4993/max4994) i com_l(off) v cc = +2.7v, v en = v cc , v nc_ or v no_ = 0v or v cc , v com_ = v cc or 0v -100 +100 na com_ on-leakage current i com_l(on) v cc = +2.7v, switch closed, v nc_ or v no_ = 0v, v cc or unconnected, v com_ = 0v, v cc , or unconnected 60 140 na dynamic v cc = +2.7v, v nc_ or v no_ = +1.5v, r l = 50 , c l = 35pf (max4991/max4993) 120 360 630 ms turn-on time (note 4) (figure 1) t on v cc = +2.7v, v nc_ or v no_ = +1.5v, r l = 50 , c l = 35pf (MAX4992/max4994) 20 150 s turn-off time t off v cc = +2.7v, v nc_ or v no_ = +1.5v, r l = 50 , c l = 35pf, figure 1 (note 4) 0.5 2 s off-isolation v iso r s = r l = 50 , f = 20khz, v com_ = 1v p-p , figure 2 (note 5) -90 db crosstalk v ct r s = r l = 50 , f = 20khz, v com_ = 1v p-p , figure 2 (note 6) -110 db total harmonic distortion thd+n f = 20hz to 20khz, v com_ = 0.5v p-p , r s = r l = 50 , dc bias = 0v 0.004 % nc_, no_ off-capacitance c off com_ = gnd (dc bias), f = 1mhz, v no(nc) = 100mv p-p , (figure 3) 45 pf com_ on-capacitance c on com_ = gnd (dc bias), f = 1mhz, v com = 100mv p-p (figure 3) 65 pf digital i/o (cb, cb1, cb2, en ) input logic-high v ih 1.4 v input logic-low v il 0.5 v input leakage current i cb v cb_ = v en = 0v or v cc -1 +1 a note 2: all devices are 100% production tested at t a = +25?. all temperature limits are guaranteed by design. note 3: flatness is defined as the difference between the maximum and minimum values of on-resistance as measured over the specified analog ranges. note 4: all timing is measured using 10% and 90% levels. note 5: off-isolation = 20log [v com_ /(v no_ or v nc_ )], v com_ = output, v no_ or v nc_ = input to off switch. note 6: between any two switches.
max4991?ax4994 low r on , dual-spdt/single-dpdt analog switches with slow turn-on time 4 _______________________________________________________________________________________ test circuits/timing diagrams measurements are standardized against shorts at ic terminals. off-isolation is measured between com_ and "off" no_ or nc_ terminal on each switch. on-loss is measured between com_ and "on" no_ or nc_ terminal on each switch. crosstalk is measured from one channel to all other channels. signal direction through switch is reversed; worst values are recorded. v cc v out cb_ nc1 no_ com_ v in max4991/MAX4992/ max4993/max4994 off-isolation = 20log v out v in on-loss = 20log v out v in crosstalk = 20log v out v in network analyzer 50 50 50 50 meas ref 0v or v cc 50 figure 2. on-loss, off-isolation, and crosstalk capacitance meter nc_ or no_ com_ cb v il or v ih f = 1mhz max4991/MAX4992/ max4993/max4994 figure 3. channel off-/on-capacitance t r < 5ns t f < 5ns 50% v il logic input r l com_ cb_ c l includes fixture and stray capacitance. v out = v in_ ( r l ) r l + r on v in_ v ih t off 0v no_ or nc_ 0.9 x v 0ut 0.1 x v out t on v out switch output logic input in depends on switch configuration; input polarity determined by sense of switch. c l v out max4991/MAX4992/ max4993/max4994 figure 1. switching time
max4991?ax4994 low r on , dual-spdt/single-dpdt analog switches with slow turn-on time _______________________________________________________________________________________ 5 typical operating characteristics (v cc = +3.0v, t a = +25?, unless otherwise noted.) on-resistance vs. v com max4991-max4994 toc01 v com (v) on-resistance ( ) 4 2 13 0.1 0.2 0.3 0.4 0.5 0.6 0 05 v cc = +1.8v v cc = +2.7v v cc = +3.3v v cc = +5.0v on-resistance vs. v com max4991-max4994 toc02 v com (v) on-resistance ( ) 12 0.15 0.20 0.30 0.35 0.40 0.25 0.45 0.50 0.10 03 t a = +85 c v cc = +2.7v t a = +25 c t a = -40 c r on flatness vs. v com max4991-max4994 toc03 v com (v) on-resistance ( ) 12 0.292 0.294 0.296 0.298 0.300 0.290 03 v cc = +2.7v quiescent supply current vs. temperature max4991-max4994 toc04 t a ( c) quiescent supply current ( a) 35 -15 0.5 1.0 2.0 2.5 3.0 1.5 3.5 4.0 0 -40 10 60 85 v cb1 = v cb2(en) = 0v v cc = 2.7v v cc = 5.5v quiescent supply current vs. supply voltage max4991-max4994 toc05 v cc (v) quiescent supply current ( a) 2.5 0.5 1.0 2.0 2.5 3.0 1.5 3.5 0 1.5 4.5 3.5 5.5 v cb1 = v cb2(en) = 0v quiescent supply current vs. logic level max4991-max4994 toc06 v cb or v cb1 (v) quiescent supply current ( a) 1 2 4 5 6 7 8 9 3 10 0 06 24 v cc = +5.5v v cb2 = v en = 0v turn-on time vs. supply voltage max4991-max4994 toc07 supply voltage (v) turn-on time (ms) 340 350 370 380 390 360 310 320 330 400 300 2.5 4.5 3.5 5.5 max4991/max4993 turn-on time vs. supply voltage max4991-max4994 toc08 supply voltage (v) turn-on time ( s) 25 15 5 10 20 30 0 2.5 4.5 3.5 5.5 MAX4992/max4994 turn-off time vs. supply voltage max4991-max4994 toc09 supply voltage (v) turn-off time (ns) 450 250 300 350 400 200 50 100 150 500 0 2.5 4.5 3.5 5.5
max4991?ax4994 low r on , dual-spdt/single-dpdt analog switches with slow turn-on time 6 _______________________________________________________________________________________ pin description pin m a x4 9 9 1 / m a x4 9 9 2 m a x4 9 9 3 / m a x4 9 9 4 name function 11v cc positive-supply voltage input. bypass v cc to gnd with a 0.1? capacitor as close as possible to the device. 2 2 no1 analog switch 1?ormally open terminal 3 3 com1 analog switch 1?ommon terminal. com1 must be connected to the speaker load for click-and-pop reduction. 4 cb1 digital control input for switch 1 4 cb digital control input for switch 1 and switch 2 5 5 nc1 analog switch 1?ormally closed terminal 6 6 gnd ground 7 7 nc2 analog switch 2?ormally closed terminal 8 cb2 digital control input for switch 2 ? en active-low enable input?rive en high to put switches in high impedance. drive en low for normal operation. 9 9 com2 analog switch 2?ommon terminal. com2 must be connected to the speaker load for click-and-pop reduction. 10 10 no2 analog switch 2?ormally open terminal typical operating characteristics (continued) (v cc = +3.0v, t a = +25?, unless otherwise noted.) frequency response max4991-max4994 toc10 frequency (hz) magnitude (db) 100 10,000 1000 -80 -60 -40 -140 -120 -100 -20 0 20 -160 10 100,000 on-response off-response crosstalk total harmonic distortion + noise vs. frequency max4991-max4994 toc11 frequency (hz) thd+n (%) 100 1000 0.01 0.1 1 0.001 10 100,000 r l = 50 slow turn-on response max4991 toc12 v in 2v/div v com 1v/div i com 10ma/div v cc = +2.8v c cl = 100 f r l = 16 20ms/div
detailed description the max4991?ax4994 low 0.3 (typ) on-resistance analog switches have break-before-make switching and operate from a single +1.8v to +5.5v supply. the max4991/max4993 provide a slow turn-on time, and with com_ used as the output, reduce clicks and pops due to coupling capacitors and audio amplifiers with a dc output bias. this feature is important for existing architectures with coupling capacitors at the output that need click-and-pop reduction. the max4993/max4994 dpdt switches with an active- low enable input ( en ) set all channels to high imped- ance and reduce supply current when driven high. the max4991?ax4994 have a low 0.004% thd+n to route high-fidelity audio signals. digital control input the max4991/MAX4992 have two digital control logic inputs, cb1 and cb2. the max4993/max4994 have a single digital-control logic input, cb. the digital control logic inputs control the position of the corresponding switch as shown in the functional diagram . driving logic inputs rail-to-rail minimizes power consumption. enable input (max4993/max4994) the max4993/max4994 feature an active-low enable input ( en ). when en is driven high, the switches are high impedance and reduce supply current. when en is driven low, the max4993/max4994 operate in nor- mal mode. driving en rail-to-rail minimizes power con- sumption. max4991?ax4994 low r on , dual-spdt/single-dpdt analog switches with slow turn-on time _______________________________________________________________________________________ 7 cb1 nc1 com1 no1 max4991/MAX4992 0 cb1 no1 max4991/MAX4992 off nc1 on 1onoff 0 cb2 no2 max4991/MAX4992 off nc2 on 1onoff cb2 nc2 com2 no2 cb nc1 com1 no1 max4993/max4994 en nc2 com2 no2 0 en max4993/max4994 0 1 0 cb 1 x off no_ on off on nc_ off off x = don't care. functional diagram
max4991?ax4994 analog signal levels the max4991?ax4994 have a very low and stable r on , 0.3 (typ), as the analog input signals are swept from ground to v cc (see typical operating character- istics ). these switches are bidirectional, allowing no_, nc_, and com_ to be configured as either inputs or outputs; however, click-and-pop reduction is only oper- ational when com_ is used as the output. power-supply rejection ratio psrr is the measurement of ac power-supply ripple or noise that couples to the output. variations in supply volt- age corrupt the audio signal due to changes in the r on value by supply modulation. the max4991?ax4994 maintain a 80db (typ) psrr across the supply-voltage range, eliminating any corruption of the audio signal from supply variations. therefore, with no audio signal, the r on variation due to supply-voltage ripple does not con- tribute to any output signal modulation. applications information click-pop reduction the max4991/max4993 feature a slow switch turn-on that can reduce click-and-pop noise caused by abrupt changes in voltage across a speaker. these voltage changes usually occur when a single-supply audio amplifier with a dc bias is turned on, causing a spike of current in the speaker while the coupling capacitor charges (see the typical operating circuit ). if the audio amplifier connected to the unused input is powered up before the switch position changes, the max4991/ max4993 reduce the current spike to com_. the speaker load must be present so that the current charging the coupling capacitor has a path to ground. layout good layout improves performance by decreasing the amount of stray capacitance and noise. minimize pcb trace lengths and resistor leads and place external components as close as possible to the device. power-supply sequencing caution: do not exceed the absolute maximum rat- ings because stresses beyond the listed ratings may cause permanent damage to the device. proper power-supply sequencing is recommended for all devices. always apply v cc before applying analog signals especially if the analog signal is not current limited. low r on , dual-spdt/single-dpdt analog switches with slow turn-on time 8 _______________________________________________________________________________________
max4991?ax4994 low r on , dual-spdt/single-dpdt analog switches with slow turn-on time _______________________________________________________________________________________ 9 cb1 cb2 max4991/MAX4992 v cc 0.1 f gnd com1 com2 nc1 nc2 audio amplifier no1 no2 audio amplifier typical application circuit chip information process: bicmos package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . package type package code document no. 10 utqfn v101aicn-1 21-0028
max4991?ax4994 low r on , dual-spdt/single-dpdt analog switches with slow turn-on time maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 10 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 5/08 initial release. 1 6/09 ? corrected names of power pins (added subscripting) in electrical characteristics . ? changed the name of toc 10 to frequency response. ? added units of measure to toc 12 . 2, 6
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