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general description the max4465?ax4469 are micropower op amps opti-mized for use as microphone preamplifiers. they pro- vide the ideal combination of an optimized gain bandwidth product vs. supply current, and low voltage operation in ultra-small packages. the max4465/ max4467/max4469 are unity-gain stable and deliver a 200khz gain bandwidth from only 24? of supply cur- rent. the max4466/max4468 are decompensated for a minimum stable gain of +5v/v and provide a 600khz gain bandwidth product. in addition, these amplifiers feature rail-to-rail outputs, high a vol , plus excellent power-supply rejection and common-mode rejectionratios for operation in noisy environments. the max4467/max4468 include a complete shutdown mode. in shutdown, the amplifiers?supply current is reduced to 5na and the bias current to the external microphone is cut off for ultimate power savings. the single max4465/max4466 are offered in the ultra-small 5-pin sc70 package, while the single with shutdown max4467/max4468 and dual max4469 are available in the space-saving 8-pin sot23 package. applications microphone preamplifiershearing aids cellular phones voice-recognition systems digital dictation devices headsets portable computing features ? +2.4v to +5.5v supply voltage operation ? versions with 5na complete shutdown available(max4467/max4468) ? excellent power-supply rejection ratio: 112db ? excellent common-mode rejection ratio: 126db ? high a vol : 125db (r l = 100k ? ) ? rail-to-rail outputs ? low 24? quiescent supply current ? gain bandwidth product: 200khz (max4465/max4467/max4469)600khz a v 5 (max4466/max4468) ? available in space-saving packages 5-pin sc70 (max4465/max4466)8-pin sot23 (max4467/max4468/max4469) max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 19-1950; rev 2; 6/12 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information part temp range pin-package max4465 exk+t -40c to +85c 5 sc70 max4465euk+t -40c to +85c 5 sot23 max4466 exk+t -40c to +85c 5 sc70 max4466euk+t -40c to +85c 5 sot23 rail-to-rail is a registered trademark of nippon motorola, ltd. ordering information continued at end of data sheet. top view gnd out in- 1 + 5 v cc in+ max4465 max4466 sc70/sot23 23 4 pin configurations typical operating circuit max4467 max4468 gnd microphonecapsule max4467/max4468 typical operating circuit with complete shutdown r bias r fb v cc out in+in- shdn c bias r bias r dc mic_bias r in c in c bypass r dc pin configurations continued at end of data sheet. + denotes a lead(pb)-free/rohs-compliant package. downloaded from: http:///
max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 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. supply voltage (v cc to gnd)................................................+6v all other pins to gnd.................................-0.3v to (v cc + 0.3v) output short-circuit duration out shorted to gnd or v cc .................................continuous continuous power dissipation (t a = +70?) 5-pin sc70 (derate 2.5mw/? above +70?) .............200mw 5-pin sot23 (derate 7.1mw/? above +70?) ...........571mw 8-pin sot23 (derate 5.3mw/? above +70?) ...........421mw operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? junction temperature ......................................................+150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? electrical characteristics(v cc = +5v, v cm = 0v, v out = v cc /2, r l = to v cc /2, shdn = gnd (max4467/max4468 only). t a = t min to t max , unless other- wise noted. typical values specified at t a = +25?.) (note 1) parameter symbol conditions min typ max units supply voltage range v cc inferred from psrr test 2.4 5.5 v t a = +25 c2 4 4 8 supply current(per amplifier) i cc t a = t min to t max 60 a supply current in shutdown i shdn shdn = v cc (note 2) 5 50 na input offset voltage v os 1 5m v input bias current i b v cm = -0.1v 2.5 100 na input offset current range i os v cm = -0.1v 1 15 na input common-mode range v cm inferred from cmrr test -0.1 v cc - 0.1 v c om m on- m od e rej ecti on rati o cmrr -0.1v v cm v cc - 1v 80 126 db 2.4v v cc 5.5v 80 112 max4465/max4467/max4469, f = 3.4khz 75 power-supply rejection ratio psrr max4466/max4468, f = 3.4khz 80 db r l = 100k ? to v cc /2, 0.05v v out v cc - 0.05v 125 open-loop gain a vol r l = 10k ? to v cc /2, 0.1v v out v cc - 0.1v 80 95 db r l = 100k ? 10 output voltage swing high v oh i v cc - v oh i r l = 10k ? 16 50 mv r l = 100k ? 10 output voltage swing low v ol r l = 10k ? 14 50 mv output short-circuit current to either supply rail 15 ma output leakage currentin shutdown shdn = v cc , 0 v out v cc ; (notes 2, 3) 0.5 100 na shdn logic low v il (note 2) v cc ? 0.3 v shdn logic high v ih (note 2) v cc ? 0.7 v shdn input current (note 2) 2 25 na max4465/max4467/max4469 200 gain bandwidth product gbwp max4466/max4468 600 khz downloaded from: http:///
max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 3 -140 -120 -100 -80 -60 -40 -20 0 20 40 60 80 100 120 140 max4465/max4467/max4469 gain and phase vs. frequency (no load) frequency (hz) 1 0.1 1k 10k 100k 10 100 1m gain (db)/phase (degrees) max4465-69 toc01 -160 -140 -120 -100 -80 -60 -40 0 -20 20 40 60 80 100 120 140 max4466/max4468 gain and phase vs. frequency (no load) frequency (hz) gain (db)/phase (degrees) max4465-69 toc02 1 1k 10k 100k 10 100 1m -140 -120 -100 -80 -60 -40 -20 0 20 40 60 80 100 120 140 max4465/max4467/max4469 gain and phase vs. frequency (c l = 100pf) frequency (hz) 1 0.1 1k 10k 100k 10 100 1m gain (db)/phase (degrees) max4465-69 toc03 note 1: all specifications are 100% production tested at t a = +25?. all temperature limits are guaranteed by design. note 2: shutdown mode is available only on the max4467/max4468. note 3: external feedback networks not considered. electrical characteristics (continued)(v cc = +5v, v cm = 0v, v out = v cc /2, r l = to v cc /2, shdn = gnd (max4467/max4468 only), t a = t min to t max , unless other- wise noted. typical values specified at t a = +25?.) (note 1) parameter symbol conditions min typ max units channel-to-channel isolation max4469 only, f = 1khz 85 db phase margin m r l = 100k ? 70 d egr ees gain margin r l = 100k ? 20 db max4465/max4467/max4469, a v = +1 45 slew rate sr output step = 4v max4466/max4468,a v = +5 300 mv/ s input noise voltage density e n f = 1khz 80 nv/ hz m ax 4465/m ax 4467/ m ax 4469 0.02 total harmonic distortion thd f = 1khz, r l = 10k ? , v out = 2vp-p max4466/max4468 0.03 % max4465/max4467/max4469, a v = +1 100 capacitive load stability c load max4466/max4468, a v = +5 100 pf shdn delay time t shdn (note 2) 1 s enable delay time t en (note 2) 50 s power-on time t on (note 2) 40 s bias switch on-resistance r s i s = 5ma (note 2) 20 500 ? typical operating characteristics (v cc = +5v, v cm = 0v, v out = v cc /2, r l = 100k ? to v cc /2, shdn = gnd (max4467/max4468 only), t a = +25?, unless otherwise noted.) downloaded from: http:///
max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 4 power-supply rejection ratio vs. frequency frequency (hz) 10 1k 10k 100k 100 1m psrr (db) -10 -130 -110 -90 -70 -50 -30 max4465-69 toc04 10,000 1000 100 10 1 -40 10 -15 35 60 85 shutdown supply current vs. temperature max4465-69 toc05 temperature ( c) supply current (pa) v shdn = v cc 22 23 2524 26 27 -40 10 -15 35 60 85 supply current vs. temperature max4465-69 toc06 temperature ( c) supply current ( a) 1000 100 10 1 0.1 -40 10 -15 35 60 85 output leakage current vs. temperature max4465-69 toc07 temperature ( c) i leak (pa) v shdn = v cc v out = v cc /2 0 -100 0.1 1 100 1000 channel-to-channel isolation vs. frequency -80 -60 -40 -20 max4465-69 toc08 frequency (khz) channel-to-channel isolation (db) 10 -600 -200-400 200 0 400 600 -40 10 -15 35 60 85 max4465-69 toc09 temperature ( c) v os ( v) input offset voltage vs. temperature 0 1 32 4 5 -40 10 -15 35 60 85 max4465-69 toc10 temperature ( c) v dd - v out (mv) output voltage swing high vs. temperature 0 1 32 4 5 -40 10 -15 35 60 85 max4465-69 toc11 temperature ( c) v out - v ss (mv) output voltage swing low vs. temperature -120 -114-116 -118 -112 -110 -108 -106 -104 -102 -100 -40 10 -15 35 60 85 max4465-69 toc12 temperature ( c) cmrr (db) common-mode rejection ratio vs. temperature typical operating characteristics (continued) (v cc = +5v, v cm = 0v, v out = v cc /2, r l = 100k ? to v cc /2, shdn = gnd (max4467/max4468 only), t a = +25?, unless otherwise noted.) downloaded from: http:///
max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 5 80 9085 100 95 110105 115 125120 130 0 1.0 1.5 2.0 0.5 2.5 3.0 3.5 4.5 4.0 5.0 large-signal gain vs. output voltage max4465-69 toc13 v out (v) gain (db) -40 10 -15 35 60 85 max4465-69 toc14 temperature ( c) gain (db) large-signal gain vs. temperature 130125 120 115 110 1.0 1.21.1 1.41.3 1.5 1.6 -40 10 -15 35 60 85 max4465-69 toc15 temperature ( c) v min (v) minimum operating voltage vs. temperature 100 10 1 0.1 0.01 0.001 20 2k 20k 200 max4465/max4467/max4469 total harmonic distortion plus noise vs. frequency max4465-69 toc16 frequency (hz) thd + n (%) v out = 2vp-p a v = +1v/v bw = 22khz r l = 100k ? r l = 10k ? 100 10 max4465-69 toc17 frequency (hz) thd + n (%) 1 0.1 0.01 0.001 20 2k 200 20k v out = 2vp-p a v = +10v/v bw = 22khz r l = 10k ? r l = 100k ? max4466/max4468 total harmonic distortion vs. frequency 100 10 1 0.1 0.01 0 1.0 1.5 0.5 2.0 thd + n (%) f = 1khza v = +1v/v bw = 122khz 0.001 max4465/max4467/max4469 total harmonic distortion plus noise vs. input amplitude max4465-69 toc18 v in (vp-p) 2.5 3.0 r l = 10k ? r l = 100k ? 100 0 0.05 0.10 0.15 0.20 0.25 0.30 10 1 0.1 0.01 0.001 max4465-69 toc19 v in (vp-p) thd + n (%) f = 1khza v = +10v/v bw = 22khz max4466/max4468 total harmonic distortion plus noise vs. input amplitude r l = 10k ? r l = 100k ? 20 s/div noninverting small-signal transient response max4465-69 toc20 50mv/div typical operating characteristics (continued) (v cc = +5v, v cm = 0v, v out = v cc /2, r l = 100k ? to v cc /2, shdn = gnd (max4467/max4468 only), t a = +25?, unless otherwise noted.) 200 s/div noninverting large-signal transient response max4465-69 toc21 2v/div downloaded from: http:///
max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 6 pin description typical operating characteristics (continued) (v cc = +5v, v cm = 0v, v out = v cc /2, r l = 100k ? to v cc /2, shdn = gnd (max4467/max4468 only), t a = +25?, unless otherwise noted.) 02 13 4 5 max4465-69 toc22 supply voltage (v) supply current ( a) supply current vs. supply voltage 4030 20 10 0 220 40 100 1k 100k 1m 70 130100 190160 max4465-69 toc23 frequency (hz) e noise (nv hz ) 10k e noise vs. frequency a vcl = +1v/v pin max4465max4466 max4467max4468 max4469 name function 4 6 (8) out amplifier output 1 outa amplifier output a 1 (4) mic_bias external microphone bias network switchoutput 3 2 (3) in- inverting amplifier input 1 3 (2) in+ noninverting amplifier input 2 4 (1) 4 gnd ground 0 5 1510 20 25 sink current vs. output voltage max4465-69 toc24 output voltage (v) sink current (ma) 0 1.0 1.5 0.5 2.0 2.5 3.0 v cc = +5v v cc = +2.4v 0 5 1510 20 25 source current vs. output voltage max4465-69 toc25 output voltage (v) source current (ma) 0 1.0 1.5 0.5 2.0 2.5 3.0 v cc = +5v v cc = +2.4v ( ) denotes s0t23 package of the max4467/max4468 downloaded from: http:///
max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 7 detailed description the max4465?ax4469 are low-power, micropower opamps designed to be used as microphone preampli- fiers. these preamplifiers are an excellent choice for noisy environments because of their high common- mode rejection and excellent power-supply rejection ratios. they operate from a single +2.4v to +5.5v sup- ply. the max4465/max4467/max4469 are unity-gain stable and deliver a 200khz gain bandwidth from only 24? of supply current. the max4466/max4468 have a mini- mum stable gain of +5v/v while providing a 600khz gain bandwidth product. the max4467/max4468 feature a complete shutdown, which is active-high, and a shutdown-controlled output providing bias to the microphone. the max4465/ max4467/max4469 feature a slew rate suited to voice channel applications. the max4466/max4468 can be used for full-range audio, e.g., pc99 inputs. rail-to-rail output stage the max4465?ax4469 can drive a 10k ? load and still typically swing within 16mv of the supply rails. figure 1shows the output voltage swing of the max4465 config- ured with a v = +10. switched bias supply when used as a microphone amplifier for an electretmicrophone, some form of dc bias for the microphone is necessary. the max4467/max4468 have the ability to turn off the bias to the microphone when the device is inshutdown. this can save several hundred microamps of supply current, which can be significant in low power applications. the mic_bias pin provides a switched version of v cc to the bias components. figure 3 shows some typical values. driving capacitive loads driving a capacitive load can cause instability in manyop amps, especially those with low quiescent current. the max4465/max4467/max4469 are unity-gain stable for a range of capacitive loads up to 100pf. figure 4 shows the response of the max4465 with an excessive capacitive load. applications information shutdown mode the max4467 and max4468 feature a low-power, com-plete shutdown mode. when shdn goes high, the sup- ply current drops to 5na, the output enters a high impedance state and the bias current to the microphone is switched off. pull shdn low to enable the amplifier. do not leave shdn unconnected. figure 5 shows the shutdown waveform. common-mode rejection ratio a microphone preamplifier ideally only amplifies the sig-nal present on its input and converts it to a voltage appearing at the output. when used in noninverting mode, there is a small output voltage fluctuation when both inputs experience the same voltage change in the ( ) denotes sot23 package of the max4467/max4468. pin description (continued) pin max4465max4466 max4467max4468 max4469 name function 5 7 (7) 8 v cc positive supply. bypass with a 0.1? capacitor to gnd. 2 ina- inverting amplifier input a 3 ina+ noninverting amplifier input a 6 inb- inverting amplifier input b 5 inb+ noninverting amplifier input b 7 outb amplifier output b 8 (6) shdn active-high shutdown input. connect to gndfor normal operation. connect to v cc for shutdown. do not leave unconnected. 5 (5) n.c. no connection. not internally connected. downloaded from: http:///
common mode. the ratio of these voltages is called thecommon-mode gain. the common-mode rejection ratio is the ratio of differential-mode gain to common-mode gain. the high cmrr properties of the max4465?ax4469 provide outstanding performances when configured as a noninverting microphone pream- plifier. power-up the max4465?ax4469 outputs typically settle within1? after power-up. figure 6 shows the output voltage on power-up. power supplies and layout the max4465?ax4469 operate from a single +2.4v to+5.5v power supply. bypass the power supply with a 0.1? capacitor to ground. good layout techniques are necessary for the max4465?ax4469 family. to decrease stray capacitance, minimize trace lengths by placing external components close to the op amp? pins. surface-mount components are recommended. in systems where analog and digital grounds are avail- able, the max4465?ax4469 should be connected to the analog ground. test circuits/timing diagrams figure 2. max4466 typical application circuit electret capsule v cc = +5v max4466 2k ? 10k ? gnd 100k ? 100pf 1m ? +5v +5v 1m ? 2k ? 0.1 f 0.01 f 1 f 1 5 2 4 3 in+ in- out max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 8 1v/div 100 s/div figure 1. rail-to-rail output operation downloaded from: http:///
max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 9 figure 3. bias network circuit microphoneinput 3.5mm socket max4468 mic_bias gnd 200k ? 47pf 100k ? 100k ? 1k ? 2.2k ? 20k ? 0.1 f 0.01 f 10 f v cc in+in- out shdn test circuits/timing diagrams (continued) 40 s/div 50mv/div c l = 2000pf figure 4. small-signal transient response with excessive capacitive load 400 s/div shdn 2v/divout r l = 10k ? c l = 10pf figure 5. max4467/max4468 shutdown waveform downloaded from: http:///
max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 10 20 s/div out1v/div v cc 2v/div figure 6. power-up/power-down waveform chip information process: bicmos ordering information (continued) part temp range pin-package max4467 eka+t -40c to +85c 8 sot23 max4468 eka+t -40c to +85c 8 sot23 max4469 eka+t -40c to +85c 8 sot23 + + inb- ina+ inb+ gnd 12 8 7 v cc outb ina- outa max4469 sot23 34 65 out in+ n.c. gnd 12 8 7 shdn v cc in- mic_bias max4467 max4468 sot23 34 65 pin configurations (continued) selector guide part minimum stable gain external microphone shdn gbwp (khz) pin-package max4465 +1 no 200 5 sc70/5 sot23 max4466 +5 no 600 5 sc70/5 sot23 max4467 +1 yes 200 8 sot23 max4468 +5 yes 600 8 sot23 max4469 +1 no 200 8 sot23 test circuits/timing diagrams (continued) + denotes a lead(pb)-free/rohs-compliant package. downloaded from: http:///
max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 11 package type package code outline no. land pattern no. sot23-5 u5+1 21-0057 90-0174 sc70 x5+1 21-0076 90-0188 sot23-8 k8+5 21-0078 90-0176 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 per - tains to the package regardless of rohs status. downloaded from: http:///
max4465?ax4469 low-cost, micropower, sc70/sot23-8, microphone preamplifiers with complete shutdown 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. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. 12 _______________maxim integrated products, inc. 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 2 6/12 added lead-free packaging information, removed so packaging information 1, 2, 10 downloaded from: http:///

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