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general description the max4245/max4246/max4247 family of low-cost op amps offer rail-to-rail inputs and outputs, draw only 320? of quiescent current, and operate from a single +2.5v to +5.5v supply. for additional power conserva- tion, the max4245/max4247 offer a low-power shutdown mode that reduces supply current to 50na, and puts the amplifiers?outputs in a high-impedance state. these devices are unity-gain stable with a 1mhz gain-band- width product driving capacitive loads up to 470pf. the max4245/max4246/max4247 family is specified from -40 c to +125?, making them suitable for use in a variety of harsh environments, such as automotive appli- cations. the max4245 single amplifier is available in ultra-small 6-pin sc70 and space-saving 6-pin sot23 packages. the max4246 dual amplifier is available in 8-pin sot23, so, and ?ax packages. the max4247 dual amplifier comes in a tiny 10-pin ?ax package. applications portable communications single-supply zero-crossing detectors instruments and terminals electronic ignition modules infrared receivers sensor-signal detection features ? rail-to-rail input and output voltage swing ? 50na (max) shutdown mode (max4245/max4247) ? 320? (typ) quiescent current per amplifier ? single +2.5v to +5.5v supply voltage range ? 110db open-loop gain with 2k ? load ? 0.01% thd with 100k ? load ? unity-gain stable up to c load = 470pf ? no phase inversion for overdriven inputs ? available in space-saving packages 6-pin sc70 or 6-pin sot23 (max4245) 8-pin sot23/so or 8-pin ?ax (max4246) 10-pin ?ax (max4247) max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps ________________________________________________________________ maxim integrated products 1 pin configurations ordering information 19-2016; rev 2; 11/11 pin configurations continued at end of data sheet. part temp range pin- package top mark max4245 axt+t -40? to +125? 6 sc70 aaz max4245aut+t -40? to +125? 6 sot23 aaub max4246 aka+t -40? to +125? 8 sot23 aain max4246asa+t -40? to +125? 8 so max4246aua+t -40? to +125? 8 ?ax max4247 aub+t -40? to +125? 10 ?ax ?ax is a registered trademark of maxim integrated products, inc. selector guide part amplifiers per package shutdown mode max4245axt 1 yes max4245aut 1 yes max4246aka 2 no max4246asa 2 no max4246aua 2 no max4247aub 2 yes for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. v ss out in- 16v dd 5 in+ max4245 sc70-6/sot23-6 top view 2 34 1 2 3 4 8 7 6 5 v dd outb inb- inb+ v ss ina+ ina- outa max4246 sot23-8/ max/so shdn + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel.
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v dd = +2.7v, v ss = 0v, v cm = 0v, v out = v dd / 2, r l connected from out to v dd / 2, shdn_ = v dd (max4245/max4247 only), t a = +25? , unless otherwise noted.) (note 1) 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. power-supply voltage (v dd to v ss ) .........................-0.3v to +6v all other pins ...................................(v ss - 0.3v) to (v dd + 0.3v) output short-circuit duration (out shorted to v ss or v dd )................................. continuous continuous power dissipation (t a = +70?) 6-pin sc70 (derate 3.1mw/? above +70?) ..............245mw 6-pin sot23 (derate 8.7mw/? above +70?)............695mw 8-pin so (derate 5.9mw/? above +70?)..................471mw 8-pin sot23 (derate 9.1mw/? above +70?)............727mw 8-pin ?ax (derate 4.5mw/? above +70?) .............362mw 10-pin ?ax (derate 5.6mw/? above +70?) ...........444mw operating temperature range .........................-40? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +160? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? parameter symbol conditions min typ max units supply voltage range v dd inferred from psrr test 2.5 5.5 v v dd = +2.7v 320 650 supply current (per amplifier) i dd v dd = +5.5v 375 700 ? supply current in shutdown i shdn_ shdn_ = v ss (note 2) 0.05 0.5 ? input offset voltage v os v ss - 0.1v v cm v dd + 0.1v 0.4 1.5 mv input bias current i b v ss - 0.1v v cm v dd + 0.1v 10 50 na input offset current i os v ss - 0.1v v cm v dd + 0.1v 1 6na input resistance r in |v in+ - v in- | 10mv 4000 k ? input common-mode voltage range v cm inferred from cmrr test v s s - 0.1 v d d + 0.1 v common-mode rejection ratio cmrr v ss - 0.1v v cm v dd + 0.1v 65 80 db power-supply rejection ratio psrr 2.5v v dd 5.5v 75 90 db v ss + 0.05v v out v dd - 0.05v, r l = 100k ? 120 large-signal voltage gain a v v ss + 0.2v v out v dd - 0.2v, r l = 2k ? 95 110 db r l = 100k ? 1 output voltage swing high v oh specified as v dd - v out r l = 2k ? 35 60 mv r l = 100k ? 1 output voltage swing low v ol specified as v out - v ss r l = 2k ? 30 60 mv sourcing 11 output short-circuit current i out ( sc ) v dd = +5.0v sinking 30 ma output leakage current in shutdown i out ( sh ) device in shutdown mode ( shdn_ = v ss ), v ss v out v dd (note 2) 0.01 0.5 ? shdn_ logic low v il (note 2) 0.3 x v dd v shdn_ logic high v ih (note 2) 0.7 x v d d v shdn_ input current i l /i h v ss shdn_ v dd (note 2) 0.5 50 na
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps _______________________________________________________________________________________ 3 electrical characteristics (continued) (v dd = +2.7v, v ss = 0v, v cm = 0v, v out = v dd / 2, r l connected from out to v dd / 2, shdn_ = v dd (max4245/max4247 only), t a = +25? , unless otherwise noted.) (note 1) parameter symbol conditions min typ max units gain-bandwidth product gbw 1.0 mhz phase margin m 70 degrees gain margin g m 20 db slew rate sr 0.4 v/? input voltage-noise density e n f = 10khz 52 nv/ hz input current-noise density i n f = 10khz 0.1 pa/ hz capacitive-load stability c load a v = 1 (note 3) 470 pf shutdown delay time t (sh) (note 2) 3 s enable delay time t (en) (note 2) 4 s power-on time t on 4s input capacitance c in 2.5 pf total harmonic distortion thd f = 10khz, v out = 2vp-p, a v = +1, v dd = +5.0v, load = 100k ? to v dd /2 0.01 % settling time to 0.01% t s v out = 4v step, v dd = +5.0v, a v = +1 10 ? electrical characteristics (v dd = +2.7v, v ss = 0v, v cm = 0v, v out = v dd / 2, r l connected from out to v dd / 2, shdn_ = v dd (max4245/max4247 only), t a = -40? to +125? , unless otherwise noted.) (note 1) parameter symbol conditions min typ max units supply voltage range v dd inferred from psrr test 2.5 5.5 v supply current (per amplifier) i dd v dd = +2.7v 800 ? supply current in shutdown i shdn_ shdn_ = v ss (note 2) 1 a input offset voltage v os v ss v cm v dd (note 4) 3.0 mv input offset voltage drift tcv os v ss v cm v dd (note 4) 2 ?/ c input bias current i b v ss v cm v dd (note 4) 100 na input offset current i os v ss v cm v dd (note 4) 10 na input common-mode voltage range v cm inferred from cmrr test (note 4) v ss v dd v common-mode rejection ratio cmrr v ss v cm v dd (note 4) 60 db power-supply rejection ratio psrr 2.5v v dd 5.5v 70 db large-signal voltage gain a v v ss + 0.2v v out v dd - 0.2v, r l = 2k ? 85 db output voltage swing high v oh specified as v dd - v out , r l = 2k ? 90 mv output voltage swing low v ol specified as v out - v ss , r l = 2k ? 90 mv output leakage current in shutdown i out ( sh ) device in shutdown mode ( shdn_ = v ss ), v ss v out v dd (note 3) 1.0 ?
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps 4 _______________________________________________________________________________________ electrical characteristics (continued) (v dd = +2.7v, v ss = 0v, v cm = 0v, v out = v dd / 2, r l connected from out to v dd / 2, shdn_ = v dd (max4245/max4247 only), t a = -40? to +125? , unless otherwise noted.) (note 1) parameter symbol conditions min typ max units shdn_ logic low v il (note 2) 0.3 ? v d d v shdn_ logic high v ih (note 2) 0.7 ? v d d v shdn_ input current i l /i h v ss shdn_ v dd (notes 2, 3) 100 na note 1: specifications are 100% tested at t a = +25?. all temperature limits are guaranteed by design. note 2: shutdown mode is only available in max4245 and max4247. note 3: guaranteed by design, not production tested. note 4: for -40? to +85?, input common-mode range is v ss - 0.1v v cm v dd + 0.1v. typical operating characteristics (v dd = 2.7v, v ss = v cm = 0v, v out = v dd / 2, no load, t a = +25?, unless otherwise noted.) 200 300 250 400 350 450 500 2.0 3.5 4.0 2.5 3.0 4.5 5.0 5.5 supply current per amplifier vs. supply voltage max4245 toc01 v dd (v) i dd ( a) t a = +125 c t a = +85 c t a = +25 c t a = -40 c 0 40 120 80 160 200 max4245/max4247 shutdown supply current per amplifier vs. temperature max4245 toc02 temperature ( c) i shdn (na) -40 70 15 125 0 200 100 400 300 500 600 01.0 0.5 1.5 2.0 2.5 input offset voltage vs. common-mode voltage max4245 toc03 v cm (v) v os ( v) v dd = 2.5v t a = +125 c t a = +85 c t a = +25 c t a = -40 c 0 200 100 400 300 500 600 023 1 456 input offset voltage vs. common-mode voltage max4245 toc04 v cm (v) v os ( v) v dd = 5.5v t a = -40 c t a = +25 c t a = +85 c t a = +125 c 0 100 50 200 150 300 250 350 -40 15 70 125 input offset voltage vs. temperature max4245 toc05 temperature ( c) v os ( v) v dd = 2.5v v dd = 5.5v -15 -5 -10 5 0 15 10 20 023 1 456 input bias current vs. common-mode voltage max4245 toc06 v cm (v) i bias (na) t a = -40 c t a = +25 c t a = +125 c v dd = 5.5v t a = +85 c
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps _______________________________________________________________________________________ 5 0 4 2 8 6 12 10 14 0 1.0 1.5 2.0 0.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 output source current vs. output voltage max4245 toc07 v out (v) i source (ma) v dd = 5.5v v dd = 2.5v 0 10 5 25 20 15 30 35 45 40 50 0 1.0 1.5 0.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 output sink current vs. output voltage max4245 toc08 v out (v) i sink (ma) v dd = 2.5v v dd = 5.5v 0 10 30 20 40 output swing high vs. temperature max4245 toc09 temperature ( c) v dd - v out (mv) -40 70 15 125 r l = 2k ? r l = 100k ? 0 10 30 20 40 output swing low vs. temperature max4245 toc10 temperature ( c) v out - v ss (mv) -40 70 15 125 r l = 2k ? r l = 100k ? 0.001 10 1000 0.1 0.01 1 100 10,000 crosstalk vs. frequency max4245 toc11 frequency (khz) crosstalk (db) -130 -110 -90 -70 -50 0 -100 0.1 10 10 100 1000 10,000 power-supply rejection ratio vs. frequency -80 max4245 toc12 frequency (khz) psrr (db) -60 -40 -20 -90 -70 -50 -30 -10 100 1000 100,000 total harmonic distortion plus noise vs. input frequency max4245 toc13 input frequency (hz) thd + n (%) 1 0.1 0.0001 0.01 0.001 10,000 r l = 100k ? a v = +1 v out = 2v p-p v dd = 5.0v 10 012345 1 0.1 0.01 0.001 0.0001 total harmonic distortion plus noise vs. amplitude max4245 toc14 output voltage (v p-p ) thd + n (%) r l = 100k ? a v = +1 f in = 1khz v dd = 5.0v 80 0.1 1 10 100 1000 10,000 40 20 0 -20 -40 gain and phase vs. frequency max4245 toc15 frequency (khz) gain (db) 60 90 -30 -90 -150 -210 -270 30 phase (deg) phase gain no load typical operating characteristics (continued) (v dd = 2.7v, v ss = v cm = 0v, v out = v dd / 2, no load, t a = +25?, unless otherwise noted.)
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v dd = 2.7v, v ss = v cm = 0v, v out = v dd / 2, no load, t a = +25?, unless otherwise noted.) 80 0.1 1 10 100 1000 10,000 40 20 0 -20 -40 gain and phase vs. frequency max4245 toc16 frequency (khz) gain (db) 60 90 -30 -90 -150 -210 -270 30 phase (deg) phase gain 2k ? || 470pf 4 s/div small-signal transient response (noninverting) in out 20mv/div 20mv/div max4245 toc17 4 s/div small-signal transient response (inverting) in out 20mv/div 20mv/div max4245 toc18 40 s/div large-signal transient response (noninverting) in out 2v/div 2v/div max4245 toc19 v dd = 5v 40 s/div large-signal transient response (inverting) in out 2v/div 2v/div max4245 toc20 v dd = 5v
detailed description rail-to-rail input stage the max4245/max4246/max4247 have rail-to-rail input and output stages that are specifically designed for low-voltage, single-supply operation. the input stage consists of composite npn and pnp differential stages, which operate together to provide a common-mode range extending to both supply rails. the crossover region of these two pairs occurs halfway between v dd and v ss . the input offset voltage is typically ?00?. low-operating supply voltage, low supply current and rail-to-rail outputs make this family of operational ampli- fiers an excellent choice for precision or general-pur- pose, low-voltage, battery-powered systems. since the input stage consists of npn and pnp pairs, the input bias current changes polarity as the common- mode voltage passes through the crossover region. match the effective impedance seen by each input to reduce the offset error caused by input bias currents flowing through external source impedance (figures 1a and 1b). the combination of high-source impedance plus input capacitance (amplifier input capacitance plus stray capacitance) creates a parasitic pole that can produce an underdamped signal response. reducing input capacitance or placing a small capacitor across the feedback resistor improves response in this case. the max4245/max4246/max4247 family? inputs are protected from large differential input voltages by inter- nal 5.3k ? series resistors and back-to-back triple-diode stacks across the inputs (figure 2). for differential- input voltages much less than 2.1v (triple-diode drop), max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps _______________________________________________________________________________________ 7 pin description pin max4245 max4246 max4247 name function 1 in+ noninverting input 244v ss ground or negative supply 3 in- inverting input 4 out amplifier output 5 shdn shutdown 6 8 10 v dd positive supply 1 1 outa amplifier output channel a 2 2 ina- inverting input channel a 3 3 ina+ noninverting input channel a 5 7 inb+ noninverting input channel b 6 8 inb- inverting input channel b 7 9 outb amplifier output channel b 5 shdna shutdown channel a 6 shdnb shutdown channel b in r3 r3 = r1 ?? r2 r1 r2 v dd in r3 r3 = r1 ?? r2 r1 r2 v dd figure 1a. minimizing offset error due to input bias current (noninverting) figure 1b. minimizing offset error due to input bias current (inverting)
max4245/max4246/max4247 input resistance is typically 4m ? . for differential volt- ages greater than 2.1v, input resistance is around 10.6k ? , and the input bias current can be approximat- ed by the following equation: i b = (v diff - 2.1v) / 10.6k ? in the region where the differential input voltage approaches 2.1v, the input resistance decreases expo- nentially from 4m ? to 10.6k ? as the diodes begin to conduct. it follows that the bias current increases with the same curve. in unity-gain configuration, high slew-rate input signals may capacitively couple to the output through the triple-diode stacks. rail-to-rail output stage the max4245/max4246/max4247 can drive a 2k ? load and still typically swing within 35mv of the supply rails. figure 3 shows the output voltage swing of the max4245 configured with a v = -1v/v. applications information power-supply considerations the max4245/max4246/max4247 operate from a sin- gle +2.5v to +5.5v supply (or dual ?.25v to ?.75v supplies) and consume only 320? of supply current per amplifier. a 90db power-supply rejection ratio allows the amplifiers to be powered directly off a decaying battery voltage, simplifying design and extending battery life. power-up the max4245/max4246/max4247 output typically set- tles within 4? after power-up. figure 4 shows the out- put voltage on power-up and power-down. shutdown mode the max4245/max4247 feature a low-power shutdown mode. when shdn_ is pulled low, the supply current drops to 50na per amplifier, the amplifier is disabled, and the output enters a high-impedance state. pulling shdn_ high enables the amplifier. figure 5 shows the max4245/max4247? shutdown waveform. due to the output leakage currents of three-state devices and the small internal pullup current for shdn_ , do not leave shdn_ open/high-impedance. leaving shdn_ open may result in indeterminate logic levels, and could adversely affect op amp operation. the logic threshold for shdn_ is referred to v ss . when using dual supplies, pull shdn_ to v ss , not gnd, to shut down the op amp. driving capacitive loads the max4245/max4246/max4247 are unity-gain stable for loads up to 470pf. applications that require greater capacitive drive capability should use an isolation resistor between the output and the capacitive load ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps 8 _______________________________________________________________________________________ in- 5.3k ? in+ 5.3k ? figure 2. input protection circuit out in 2v/div 2v/div 400 s/div figure 3. rail-to-rail input/output voltage range out v dd 2v/div 2v/div 10 s/div figure 4. power-up/power-down waveform
(figures 6a, 6b, 6c). note that this alternative results in a loss of gain accuracy because r iso forms a voltage divider with the r load . power-supply bypassing and layout the max4245/max4246/max4247 family operates from either a single +2.5v to +5.5v supply or dual ?.25v to ?.75v supplies. for single-supply operation, bypass the power supply with a 100nf capacitor to v ss (in this case gnd). for dual-supply operation, both the v dd and the v ss supplies should be bypassed to ground with separate 100nf capacitors. good pc board layout techniques optimize perfor- mance by decreasing the amount of stray capacitance at the op amp? inputs and output. to decrease stray capacitance, minimize trace lengths and widths by placing external components as close to the device as possible. use surface-mount components when possible. chip information process: bicmos top view v dd outb inb- inb+ v ss ina+ ina- outa max 1 2 3 4 10 9 8 7 56 shdna shdnb max4247 pin configurations (continued) max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps _______________________________________________________________________________________ 9 out shdn 2v/div 2v/div 400 s/div figure 5. shutdown waveform out in r iso r l c l figure 6a. using a resistor to isolate a capacitive load from the op amp out in 100mv/div 100mv/div 10 s/div r iso = 0 r l = 2k ? c l = 2200pf figure 6b. pulse response without isolating resistor out in 100mv/div 100mv/div 10 s/div r iso = 100 ? r l = 2k ? c l = 2200pf figure 6c. pulse response with isolating resistor
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps 10 ______________________________________________________________________________________ package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code document no. land pattern no. 6 sot23 u6+4 21-0058 90-0175 6 sc70 x6sn+1 21-0077 90-0189 8 sot23 k8+5 21-0078 90-0176 8 so s8+4 21-0041 90-0096 8 ?ax u8+1 21-0036 90-0092 10 ?ax u10+2 21-0061 90-0330
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps ______________________________________________________________________________________ 11 package information (continued) for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status.
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps 12 ______________________________________________________________________________________ package information (continued) for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status.
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps ______________________________________________________________________________________ 13 0 0 marking package outline, sot-23, 8l body 21-0078 j 1 1 package information (continued) for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status.
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps 14 ______________________________________________________________________________________ package information (continued) for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status.
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps ______________________________________________________________________________________ 15 package information (continued) for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status.
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps 16 ______________________________________________________________________________________ d d package information (continued) for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status.
max4245/max4246/max4247 ultra-small, rail-to-rail i/o with disable, single-/dual-supply, low-power op amps 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 17 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 5/01 initial release 2 11/11 added lead-free data to ordering information .1

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