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general description the max4230?ax4234 single/dual/quad, high-output- drive cmos op amps feature 200ma of peak output current, rail-to-rail input, and output capability from a single 2.7v to 5.5v supply. these amplifiers exhibit a high slew rate of 10v/? and a gain-bandwidth product (gbwp) of 10mhz. the max4230?ax4234 can drive typical headset levels (32 ? ), as well as bias an rf power amplifier (pa) in wireless handset applications. the max4230 comes in a tiny 5-pin sc70 package and the max4231, single with shutdown, is offered in the 6-pin sc70 package. the dual op-amp max4233 is offered in the space-saving 10-bump ucsp, provid- ing the smallest footprint area for a dual op amp with shutdown. these op amps are designed to be part of the pa con- trol circuitry, biasing rf pas in wireless headsets. the max4231/max4233 offer a shdn feature that drives the output low. this ensures that the rf pa is fully dis- abled when needed, preventing unconverted signals to the rf antenna. the max4230 family offers low offsets, wide bandwidth, and high-output drive in a tiny 2.1mm x 2.0mm space- saving sc70 package. these parts are offered over the automotive temperature range (-40? to +125?). applications rf pa biasing controls in handset applications portable/battery-powered audio applications portable headphone speaker drivers (32 ? ) audio hands-free car phones (kits) laptop/notebook computers/tft panels sound ports/cards set-top boxes digital-to-analog converter buffers transformer/line drivers motor drivers features 30ma output drive capability rail-to-rail input and output 1.1ma supply current per amplifier 2.7v to 5.5v single-supply operation 10mhz gain-bandwidth product high slew rate: 10v/? 100db voltage gain (r l = 100k ? ) 85db power-supply rejection ratio no phase reversal for overdriven inputs unity-gain stable for capacitive loads to 780pf low-power shutdown mode reduces supply current to <1? available in 5-pin sc70 package (max4230) available in 10-bump ucsp package (max4233) max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 ________________________________________________________________ maxim integrated products 1 19-2164; rev 2; 7/02 ordering information continued at end of data sheet. 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. selector guide appears at end of data sheet. pin configurations appear at end of data sheet. rail-to-rail is a registered trademark of nippon motorola, ltd. ucsp is a trademark of maxim integrated products, inc. ordering information part temp range pin- package top m ark max4230 axk-t -40 c to +125 c 5 sc70-5 acs max4230auk-t -40 c to +125 c 5 sot23-5 abzz max4231 axt-t -40 c to +125 c 6 sc70-6 aba max4231aut-t -40 c to +125 c 6 sot23-6 aauv typical operating circuit max4231 dac pa 2.7v to 5.5v r iso antenna i out = 30ma c load c rr f shdn
max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 2 _______________________________________________________________________________________ absolute maximum ratings 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. supply voltage (v dd to v ss ) ....................................................6v all other pins ....................................(v ss - 0.3v) + (v dd + 0.3v) output short-circuit duration to v dd or v ss (note 1) ..................1s continuous power dissipation (t a = +70 c) 5-pin sc70 (derate 3.1mw/ c above +70 c) ..............247mw 5-pin sot23 (derate 7.1mw/ c above +70 c)............571mw 6-pin sc70 (derate 3.1mw/ c above +70 c) ..............245mw 6-pin sot23 (derate 8.7mw/ c above +70 c) ...........696mw 8-pin sot23 (derate 8.9mw/ c above +70 c) ...........714mw 8-pin max (derate 4.5mw/ c above +70 c) ............362mw 10-pin max (derate 5.6mw/ c above +70 c) ..........444mw 10-bump ucsp (derate 6.1mw/ c above +70 c) .....484mw 14-pin tssop (derate 9.1mw/ c above +70 c) ........727mw 14-pin so (derate 8.3mw/ c above +70 c) ...............667mw operating temperature range .........................-40 c to +125 c junction temperature ......................................................+150 c storage temperature range .............................-65 c to +150 c lead temperature (soldering, 10s) .................................+300 c note 1: package power dissipation should also be observed. parameter symbol conditions min typ max units operating supply voltage range v dd inferred from psrr test 2.7 5.5 v all parts except max4232aka 0.85 3 input offset voltage v os max4232aka 6 mv input bias current i b v cm = v ss to v dd 50 pa input offset current i os v cm = v ss to v dd 50 pa input resistance r in 1000 m ? common-mode input voltage range v cm inferred from cmrr test v ss v dd v common-mode rejection ratio cmrr v ss < v cm < v dd 52 70 db power-supply rejection ratio psrr v dd = 2.7v to 5.5v 73 85 db shutdown output impedance r out v shdn = 0v (note 3) 10 ? output voltage in shutdown v out ( shdn ) v shdn = 0v, r l = 200 ? (note 3) 68 120 mv r l = 100k ? 100 r l = 2k ? 85 98 large-signal voltage gain a vol v ss + 0.20 < v out < v dd - 0.20v r l = 200 ? 74 80 db v dd - v oh 400 500 r l = 32 ? v ol - v ss 360 500 v dd - v oh 80 120 r l = 200 ? v ol - v ss 70 120 v dd - v oh 814 output voltage swing v out r l = 2k ? v ol - v ss 714 mv output source/sink current v out = 0.15v to (v dd - 0.15v) 7 10 ma v dd - v oh 128 200 i l = 10ma v dd = 2.7v v ol - v ss 112 175 v dd - v oh 240 320 output voltage with current load i l = 30ma v dd = 5v v ol - v ss 224 300 mv dc electrical characteristics (v dd = 2.7v, v ss = 0v, v cm = v dd /2, v out = (v dd /2), r l = connected to (v dd /2), v shdn = v dd , t a = +25? , unless otherwise noted.) (note 2)
max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 _______________________________________________________________________________________ 3 parameter symbol conditions min typ max units v dd = 5.5v, v cm = v dd / 2 1.2 2.3 quiescent supply current (per amplifier) i dd v dd = 2.7v, v cm = v dd / 2 1.1 2.0 ma v dd = 5.5v 0.5 1 shutdown supply current (per amplifier) (note 3) i dd ( shdn ) v s hdn = 0v, r l = v dd = 2.7v 0.1 1 a shutdown mode (note 3) v ss + 0.3 shdn logic threshold normal mode (note 3) v dd - 0.3 v shdn input bias current v ss < v s hdn < v dd (note 3) 50 pa parameter symbol conditions min typ max units operating supply voltage range v dd inferred from psrr test 2.7 5.5 v all parts except max4232aka 5 input offset voltage v os max4232aka 8 mv offset voltage tempco ? v os / ? t 3 v/ c common-mode input voltage range v cm inferred from cmrr test v ss v dd v common-mode rejection ratio cmrr v ss < v cm < v dd 46 db power-supply rejection ratio psrr v dd = 2.7v to 5.5v 70 db output voltage in shutdown v out ( shdn ) v shdn < 0v, r l = 200 ? (note 3) 150 mv r l = 2k ? 76 large-signal voltage gain a vol v ss + 0.2v < v dd - 0.2v r l = 200 ? 67 db v dd - v oh 650 r l = 32 ? , t a = +85 c v ol - v ss 650 v dd - v oh 150 r l = 200 ? v ol - v ss 150 v dd - v oh 20 output voltage swing v out r l = 2k ? v ol - v ss 20 mv output source/sink current v out = 0.15v to (v dd - 0.15v) 4 ma v dd - v oh 250 i l = 10ma v dd = 2.7v v ol - v ss 230 v dd - v oh 400 output voltage with current load i l = 30ma, t a = -40 c to +85 c v dd = 5v v ol - v ss 370 mv dc electrical characteristics (continued) (v dd = 2.7v, v ss = 0v, v cm = v dd /2, v out = (v dd /2), r l = connected to (v dd /2), v shdn = v dd , t a = +25 c , unless otherwise noted.) (note 2) dc electrical characteristics (v dd = 2.7v, v ss = 0v, v cm = v dd /2, v out = (v dd /2), r l = connected to (v dd /2), v shdn = v dd , t a = -40 to +125 c , unless oth- erwise noted.) (note 2)
max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 4 _______________________________________________________________________________________ parameter symbol conditions min typ max units gain-bandwidth product gbwp v cm = v dd /2 10 mhz full-power bandwidth fpbw v out = 2v p-p , v dd = 5v 0.8 mhz slew rate sr 10 v/s phase margin pm 70 degrees gain margin gm 15 db total harmonic distortion plus noise thd+n f = 10khz, v out = 2v p-p , a vcl = 1v/v 0.0005 % input capacitance c in 8pf f = 1khz 15 voltage noise density e n f = 10khz 12 nv/ hz channel-to-channel isolation f = 1khz, r l = 100k ? 125 db capacitive load stability a vcl = 1v/v, no sustained oscillations 780 pf shutdown time t shdn (note 3) 1 s enable time from shutdown t enable (note 3) 1 s power-up time t on 5s note 2: all units 100% tested at +25 c. all temperature limits are guaranteed by design. note 3: shdn logic parameters are for max4231/max4233 only. parameter symbol conditions min typ max units v dd = 5.5v, v cm = v dd /2 2.8 quiescent supply current (per amplifier) i dd v dd = 2.7v, v cm = v dd /2 2.5 ma v dd = 5.5v 2.0 shutdown supply current (per amplifier) (note 3) i dd ( shdn ) v shdn < 0, r l = v dd = 2.7v 2.0 a dc electrical characteristics (continued) (v dd = 2.7v, v ss = 0v, v cm = v dd /2, v out = (v dd /2), r l = connected to (v dd /2), v shdn = v dd , t a = -40 to +125 c , unless oth- erwise noted.) (note 2) ac electrical characteristics (v dd = 2.7v, v ss = 0v, v cm = v dd /2, v out = (v dd /2), r l = connected to (v dd /2), v shdn = v dd , t a = +25 c , unless otherwise noted.) (note 2)
max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 _______________________________________________________________________________________ 5 gain and phase vs. frequency frequency (hz) 0.01k 10k 100k 1m 10m 0.1k 1k 100m gain (db) 70 -30 -20 -10 0 10 20 30 60 50 40 -180 phase (degrees) 120 -150 -120 -90 -60 -30 0 90 60 30 max4230 toc01 a v = 1000v/v gain and phase vs. frequency (c l = 250pf) frequency (hz) 0.01k 10k 100k 1m 10m 0.1k 1k 100m gain (db) 70 -30 -20 -10 0 10 20 30 60 50 40 -180 phase (degrees) 120 -150 -120 -90 -60 -30 0 90 60 30 max4230 toc02 a v = 1000v/v c l = 250pf 0 0.4 0.2 0.8 0.6 1.2 1.0 1.4 1.8 1.6 2.0 -40 0 20 40 -20 60 80 100 120 supply current vs. temperature max4230 toc05 temperature ( c) supply current (ma) power-supply rejection ratio vs. frequency frequency (hz) 0.01k 10k 100k 1m 0.1k 1k 10m max4230 toc03 psrr (db) 0 -100 -90 -80 -70 -60 -50 -40 -10 -20 -30 a v = 1v/v 1000 100 10 1 0.1 0.01 1k 100k 1m 10k 10m output impedance vs. frequency max4230 toc04 frequency (hz) output impedance ( ? ) a v = 1v/v 50 60 70 80 90 100 110 -40 0 -20 20 40 60 80 100 120 max4230 toc06 temperature ( c) supply current (na) supply current vs. temperature (shdn = low) shdn = v ss __________________________________________typical operating characteristics (v dd = 2.7v, v ss = 0v, v cm = v dd /2, v out = v dd /2, r l = , connected to v dd /2, v shdn = v dd , t a = +25 c, unless otherwise noted.)
max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 6 _______________________________________________________________________________________ 0 0.6 0.4 0.2 1.0 0.8 1.8 1.6 1.4 1.2 2.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 max4230 toc07 supply voltage (v) supply current (ma) supply current per amplifier vs. supply voltage -40 0 -20 20 40 60 80 100 120 max4230 toc08 temperature ( c) -2 -1 0 1 2 v os (mv) input offset voltage vs. temperature v dd = 5.0v v dd = 2.7v 0 20 40 60 80 100 -40 0 -20 20 40 60 80 100 120 output swing high vs. temperature max4230/34 toc09 temperature ( c) v dd - v out (mv) v dd = 2.7v r l = 200 ? v dd = 5.0v r l = 200 ? 0 40 20 80 60 120 100 140 -40 0 20 -20 40 60 80 100 120 output swing low vs. temperature max4230/3 toc10 temperature ( c) v out - v ss (mv) v dd = 2.7v r l = 200 ? v dd = 5.0v r l = 200 ? 0.2 0.8 0.6 0.4 1.0 1.2 1.4 0 2.0 1.5 0.5 1.0 2.5 3.0 3.5 4.0 4.5 5.0 supply current per amplifier vs. common-mode voltage max4230/34 toc13 common-mode voltage (v) supply current (ma) v dd = 5.0v -2.0 -1.0 -1.5 -0.5 0.5 0 1.0 0 0.5 1.0 1.5 2.0 2.5 input offset voltage vs. common-mode voltage max4230/3 toc11 common-mode voltage (v) input offset voltage (mv) 0.2 0.6 0.4 1.0 0.8 1.2 0 0.5 1.0 1.5 2.0 2.5 supply current per amplifier vs. common-mode voltage max4230/3 toc12 common-mode voltage (v) supply current (ma) v dd = 2.7v 0.45 10 100 1k 10k 100k total harmonic distortion + noise vs. frequency 0.05 max4230/34 toc14 frequency (hz) thd + noise (%) 0.15 0.25 0.35 0.30 0.20 0.10 0 0.40 r l = 32 ? v out = 2v p-p 500khz lowpass filter r l = 10k ? total harmonic distortion + noise vs. peak-to-peak output voltage max4230/34 toc15 peak-to-peak (v) thd + noise (%) 10 0.0001 4.0 4.2 4.6 5.0 0.001 0.1 1 4.4 4.8 r l = 2k ? r l = 250 ? r l = 25 ? r l = 100k ? f = 10khz v dd = 5v ____________________________typical operating characteristics (continued) (v dd = 2.7v, v ss = 0v, v cm = v dd /2, v out = v dd /2, r l = , connected to v dd /2, v shdn = v dd , t a = +25 c, unless otherwise noted.)
max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 _______________________________________________________________________________________ 7 400ns/div small-signal transient response (noninverting) in 50mv/div max4230/34 toc16 out 400ns/div small-signal transient response (inverting) in 50mv/div max4230/34 toc17 out 400ns/div large-signal transient response (noninverting) in 1v/div max4230/34 toc18 out 400ns/div large-signal transient response (inverting) in 1v/div max4230/34 toc19 out 0 50 150 100 200 250 2.0 3.0 2.5 3.5 4.0 4.5 5.0 output current vs. output voltage (sourcing, v dd = 5.0v) max4230/34 toc22 output voltage (v) output current (ma) v diff = 100mv 0 20 10 30 60 70 50 40 80 1.0 1.4 1.6 1.8 2.0 1.2 2.2 2.4 2.6 2.8 3.0 output current vs. output voltage (sourcing, v dd = 2.7v) max4230/34 toc20 output voltage (v) output current (ma) v diff = 100mv -80 -60 -70 -40 -50 -30 -20 -10 0 0 0.4 0.6 0.2 0.8 1.0 1.2 1.4 1.6 output current vs. output voltage (sinking, v dd = 2.7v) max4230/34 toc21 output voltage (v) output current (ma) v diff = 100mv -250 -200 -100 -150 -50 0 0 1.0 0.5 1.5 2.0 2.5 3.0 output current vs. output voltage (sinking, v dd = 5.0v) max4230/34 toc23 output voltage (v) output current (ma) v diff = 100mv 200 100 10 100 10k 100k frequency (hz) input voltage noise (nv/ hz) 1k input voltage noise vs. frequency max4230/34 toc24 ____________________________typical operating characteristics (continued) (v dd = 2.7v, v ss = 0v, v cm = v dd /2, v out = v dd /2, r l = , connected to v dd /2, v shdn = v dd , t a = +25 c, unless otherwise noted.)
max4230?ax4234 detailed description rail-to-rail input stage the max4230 max4234 cmos operational amplifiers have parallel-connected n- and p-channel differential input stages that combine to accept a common-mode range extending to both supply rails. the n-channel stage is active for common-mode input voltages typi- cally greater than (v ss + 1.2v), and the p-channel stage is active for common-mode input voltages typi- cally less than (v dd - 1.2v). applications information package power dissipation warning: due to the high output current drive, this op amp can exceed the absolute maximum power-dissi- pation rating. as a general rule, as long as the peak cur- rent is less than or equal to 40ma, the maximum package power dissipation is not exceeded for any of the package types offered. there are some exceptions to this rule, however. the absolute maximum power-dissipation rating of each package should always be verified using the fol- lowing equations. the equation below gives an approxi- mation of the package power dissipation: where: v rms = rms voltage from v dd to v out when sourcing current and rms voltage from v out to v ss when sink- ing current. i rms = rms current flowing out of or into the op amp and the load. = phase difference between the voltage and the cur- rent. for resistive loads, cos = 1. p v i cos ic diss rms rms () ? high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 8 _______________________________________________________________________________________ pin m ax42 30 sot 23 / sc7 0 m ax42 31 sot 23 / sc7 0 m ax42 32 sot 23 / m a x m a x4 2 3 3 m a x m ax42 33 u csp m ax42 34 t ssop/ so name function 11 in+ noninverting input 2244b44v ss negative supply input. connect to ground for single-supply operation. 33 in- inverting input 44 out amplifier output 5 6 8 10 b1 11 v dd positive supply input 5 5, 6 c4, a4 shdn, shdn1 , shdn2 shutdown control. tie to high for normal operation. 3 3 c3 3 in1+ noninverting input to amplifier 1 2 2 c2 2 in1- inverting input to amplifier 1 1 1 c1 1 out1 amplifier 1 output 5 7 a3 5 in2+ noninverting input to amplifier 2 6 8 a2 6 in2- inverting input to amplifier 2 7 9 a1 7 out2 amplifier 2 output 10, 12 in3+, in4+ noninverting input to amplifiers 3 and 4 9, 13 in3-, in4- inverting input to amplifiers 3 and 4 8, 14 out3, out4 amplifiers 3 and 4 outputs pin description
for example, the circuit in figure 1 has a package power dissipation of 196mw: where: v dc = the dc component of the output voltage. i dc = the dc component of the output current. v peak = the highest positive excursion of the ac com- ponent of the output voltage. i peak = the highest positive excursion of the ac com- ponent of the output current. therefore: p ic(diss) = v rms i rms cos = 196mw adding a coupling capacitor improves the package power dissipation because there is no dc current to the load, as shown in figure 2: therefore: p ic(diss) = v rms i rms cos = 15.6mw if the configuration in figure 1 were used with all four of the max4234 amplifiers, the absolute maximum power- dissipation rating of this package would be exceeded (see the absolute maximum ratings section). 60mw single-supply stereo headphone driver two max4230/max4231s can be used as a single-sup- ply, stereo headphone driver. the circuit shown in figure 2 can deliver 60mw per channel with 1% distor- tion from a single 5v supply. the input capacitor (c in ), in conjunction with r in , forms a highpass filter that removes the dc bias from the incoming signal. the -3db point of the highpass filter is given by: f rc db in in ? = 3 1 2 v i + i 2 rms rms peak ? == ?=+ = . . ./ . v v v ia v ma peak rms dc rms 2 10 2 0 707 0 10 32 2 22 1 ? rms dd dc rms peak v v i + i 2 ?? () + =?+= ?=+ = . . . . . ./ . v vv v v i vv ma peak rms dc rms 2 36 18 10 2 2 507 18 32 10 32 2 78 4 ? ? max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 _______________________________________________________________________________________ 9 right audio input left audio input c in c in r in r in r f c out v bias c out headphone jack to 32 ? stereo headset r f max4230 figure 2. circuit example: adding a coupling capacitor greatly reduces power dissipation of its package 3.6v v in = 2v p-p r c 32 ? r max4230 max4231 figure 1. max4230/max4231 used in single-supply operation circuit example
max4230?ax4234 choose gain-setting resistors r in and r f according to the amount of desired gain, keeping in mind the maxi- mum output amplitude. the output coupling capacitor, c out , blocks the dc component of the amplifier out- put, preventing dc current flowing to the load. the out- put capacitor and the load impedance form a highpass filer with the -3db point determined by: for a 32 ? load, a 100f aluminum electrolytic capaci- tor gives a low-frequency pole at 50hz. bridge amplifier the circuit shown in figure 3 uses a dual max4230 to implement a 3v, 200mw amplifier suitable for use in size-constrained applications. this configuration elimi- nates the need for the large coupling capacitor required by the single op-amp speaker driver when sin- gle-supply operation is necessary. voltage gain is set to 10v/v; however, it can be changed by adjusting the 82k ? resistor value. rail-to-rail input stage the max4230 max4234 cmos op amps have parallel- connected n- and p-channel differential input stages that combine to accept a common-mode range extend- ing to both supply rails. the n-channel stage is active for common-mode input voltages typically greater than (v ss + 1.2v), and the p-channel stage is active for common-mode input voltages typically less than (v dd - 1.2v). rail-to-rail output stage the minimum output is within millivolts of ground for sin- gle-supply operation, where the load is referenced to ground (v ss ). figure 4 shows the input voltage range and the output voltage swing of a max4230 connected as a voltage follower. the maximum output voltage swing is load dependent; however, it is guaranteed to be within 500mv of the positive rail (v dd = 2.7v) even with maximum load (32 ? to ground). the max4230 max4234 incorporate a smart short-cir- cuit protection feature. when v out is shorted to v dd or v ss , the device detects a fault condition and limits the output current, therefore protecting the device and the application circuit. if v out is shorted to any voltage other than v dd or v ss , the smart short-circuit protection is not activated. when the smart short circuit is not active, the output currents can exceed 200ma (see typical operating characteristics .) input capacitance one consequence of the parallel-connected differential input stages for rail-to-rail operation is a relatively large input capacitance c in (5pf typ). this introduces a pole at frequency (2 r c in ) -1 , where r is the parallel combi- nation of the gain-setting resistors for the inverting or noninverting amplifier configuration (figure 5). if the pole frequency is less than or comparable to the unity-gain bandwidth (10mhz), the phase margin is reduced, and the amplifier exhibits degraded ac performance through either ringing in the step response or sustained oscilla- tions. the pole frequency is 10mhz when r = 2k ? . to maximize stability, r << 2k ? is recommended. f rc db l out ? = 3 1 2 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 10 ______________________________________________________________________________________ figure 4. rail-to-rail input/output range figure 3. dual max4230/max4231 bridge amplifier for 200mw at 3v 1 6 7 5 2 8 3v 3v 3 4 max4232 1/2 max4232 1/2 0.5v p-p r5 51k ? r1 16k ? r2 82k ? r4 10k ? 32 ? fs = 100hz r3 10k ? r6 51k ? c2 0.1 f c1 0.1 f in (1v/div) out (1v/div) time (5 s/div) v cc = 3.0v r l = 100k ?
to improve step response when r > 2k ? , connect small capacitor c f between the inverting input and out- put. choose c f as follows: c f = 8(r / r f ) [pf] where r f is the feedback resistor and r is the gain-set- ting resistor (figure 5). driving capacitive loads the max4230 max4234 have a high tolerance for capacitive loads. they are stable with capacitive loads up to 780pf. figure 6 is a graph of the stable operating region for various capacitive loads vs. resistive loads. figures 7 and 8 show the transient response with excessive capacitive loads (1500pf), with and without the addition of an isolation resistor in series with the output. figure 9 shows a typical noninverting capaci- tive-load-driving circuit in the unity-gain configuration. max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 ______________________________________________________________________________________ 11 max4230 v in v out r = r || r f r f c f = rc in r f c f r inverting max4230 v in v out r = r || r f r f c f = rc in r f r c f noninverting figure 5. inverting and noninverting amplifiers with feedback compensation 0 500 1500 1000 2000 2500 1 100 10 1k 10k 100k resistive load ( ? ) capacitive load (pf) v dd = 5.0v r l to v dd /2 stable unstable figure 6. capacitive load stability 1 s/div 20mv/div 20mv/div v dd = 3.0v, c l = 1500pf r l = 100k ? , r iso = 39 ? figure 8. small-signal transient response with excessive capacitive load with isolation resistor 1 s/div 20mv/div 20mv/div v dd = 3.0v, c l = 1500pf r l = 100k ? , r iso = 0 ? figure 7. small-signal transient response with excessive capacitive load
max4230?ax4234 the resistor improves the circuit s phase margin by iso- lating the load capacitor from the op amp s output. power-up and shutdown modes the max4231/max4233 have a shutdown option. when the shutdown pin ( shdn ) is pulled low, supply current drops to 0.5a per amplifier (v dd = 2.7v), the amplifiers are disabled, and their outputs are driven to v ss . since the outputs are actively driven to v ss in shutdown, any pullup resistor on the output causes a current drain from the supply. pulling shdn high enables the amplifier. in the dual max4233, the two amplifiers shut down independently. figure 10 shows the max4231 s output voltage to a shutdown pulse. the max4231 max4234 typically settle within 5s after power-up. figures 11 and 12 show i dd to a shutdown plus and voltage power-up cycle. when exiting shutdown, there is a 6s delay before the amplifier s output becomes active (figure 10). high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 12 ______________________________________________________________________________________ r iso c l figure 9. capacitive-load-driving circuit 100 s/div shdn 2v/div i dd 1ma/div out 2v/div figure 11. shutdown enable/disable supply current 40 s/div v dd 2v/div i dd 1ma/div figure 12. power-up/down supply current 4 s/div 1v/div 1v/div figure 10. shutdown output voltage enable/disable selector guide amps per package shutdown mode max4230 single max4231 single yes part max4232 dual max4233 dual yes max4234 quad
max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 ______________________________________________________________________________________ 13 pin configurations top view in2- in2+ v ss 1 2 8 7 v dd out2 in1- in1+ out1 sot23/ max 3 4 6 5 max4232 1 2 3 4 5 10 9 8 7 6 v dd out2 in2- in2+ v ss in1+ in1- out1 max4233 max shdn2 shdn1 v ss out in- 16v dd 5 in+ sc70/sot23 2 34 shdn max4231 14 13 12 11 10 9 8 1 2 3 4 5 6 7 out4 in4- in4+ v dd v ss in1+ in1- out1 max44234 in3+ in3- out3 out2 in2- in2+ tssop/so v ss out in- 1 5 v dd in+ max4230 sot23/sc70 2 3 4 out1 v dd out2 in1- in2- in1+ in2+ v ss shdn1 shdn2 ucsp c1 b1 a1 a2 a3 a4 b4 c2 c3 c4 max4233 power supplies and layout the max4230 max4234 can operate from a single 2.7v to 5.5v supply, or from dual 1.35v to 2.5v sup- plies. for single-supply operation, bypass the power supply with a 0.1f ceramic capacitor. for dual-supply operation, bypass each supply to ground. good layout improves performance by decreasing the amount of stray capacitance at the op amps inputs and outputs. decrease stray capacitance by placing external com- ponents close to the op amps pins, minimizing trace and lead lengths. ordering information (continued) part temp range pin- package top m ark max4232 aka-t -40 c to +125 c 8 sot23-8 aakw max4232aua -40 c to +125 c 8 max max4233 aub -40 c to +125 c 10 max max4233abc-t -40 c to +125 c 10 ucsp abe max4234 aud -40 c to +125 c 14 tssop max4234asd -40 c to +125 c 14 so chip information max4230 transistor count: 230 max4231 transistor count: 230 max4232 transistor count: 462 max4233 transistor count: 462 max4234 transistor count: 924
max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 14 ______________________________________________________________________________________ sc70, 5l.eps sc70, 6l.eps package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)
max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 ______________________________________________________________________________________ 15 sot5l.eps 6lsot.eps package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)
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. 16 __________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 ? 2002 maxim integrated products printed usa is a registered trademark of maxim integrated products. max4230?ax4234 high-output-drive, 10mhz, 10v/?, rail-to-rail i/o op amps with shutdown in sc70 8lumaxd.eps package outline, 8l umax/usop 1 1 21-0036 j rev. document control no. approval proprietary information title: max 0.043 0.006 0.014 0.120 0.120 0.198 0.026 0.007 0.037 0.0207 bsc 0.0256 bsc a2 a1 c e b a l front view side view e h 0.60.1 0.60.1 ? 0.500.1 1 top view d 8 a2 0.030 bottom view 1 6 s b l h e d e c 0 0.010 0.116 0.116 0.188 0.016 0.005 8 4x s inches - a1 a min 0.002 0.95 0.75 0.5250 bsc 0.25 0.36 2.95 3.05 2.95 3.05 4.78 0.41 0.65 bsc 5.03 0.66 6 0 0.13 0.18 max min millimeters - 1.10 0.05 0.15 dim package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)

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