View MAX44242_7706631.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

general description the MAX44242 provides a combination of high voltage, low noise, low input bias current in a dual channel and features rail-to-rail at the output. this dual amplifier operates over a wide supply voltage range from a single 2.7v to 20v supply or split 1.35v to 10v supplies and consumes only 1.2ma quiescent supply current per channel. the MAX44242 is a unity-gain stable amplifier with a gain-bandwidth product of 10mhz. the device outputs drive up to 200pf load capacitor without any external isolation resistor compensation. the MAX44242 is available in 8-pin sot23 and max m packages and is rated for operation over the -40oc to +125oc automotive temperature range. applications chemical sensor interface photodiode sensor interface medical pulse oximetry industrial: process and control precision instrumentation features and benefts 2.7v to 20v single supply or 1.35v to 10v dual supplies 0.5pa (max) input bias current 5nv/ hz input voltage noise 10mhz bandwidth 8v/s slew rate rail-to-rail output integrated emi filters 1.2ma supply current per amplifier ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX44242.related . max is a registered trademark of maxim integrated products, inc. MAX44242 in- in+ photodiode ref in- in+ photodiode v dd ref sensor pre-amp configuration 19-6827 rev 0; 12/13 typical application circuit evaluation kit available MAX44242 20v, low input bias-current, low-noise, dual op amplifier
supply voltage (v dd to v ss ) ................................ -0.3v to +22v all other pins ................................ (v ss - 0.3v) to (v dd + 0.3v) short-circuit duration to v dd or v ss ...................................... 1s continuous input current (any pins) ............................... 20ma differential input voltage ...................................................... 6v continuous power dissipation (t a = +70c) 8-pin sot23 (derate 5.1mw/c above +70c) ....... 408.2mw 8-pin max (derate 4.5mw/c above +70c) ............ 362mw operating temperature range ......................... -40c to +125c junction temperature ...................................................... +150c storage temperature range ............................ -65c to +150c lead temperature (soldering, 10s) ................................. +300c sot23 junction-to-ambient thermal resistance ( ja ) ........ 196c/w junction-to-case thermal resistance ( jc ) ............... 70c/w max junction-to-ambient thermal resistance ( ja ) ........ 221c/w junction-to-case thermal resistance ( jc ) ............... 42c/w (note 1) (v dd = 10v, v ss = 0v, v in+ = v in- = v dd /2, r l = 10k to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values are at t a = +25c.) (note 2) parameter symbol conditions min typ max units power supply supply voltage range v dd guaranteed by psrr 2.7 20 v power-supply rejection ratio psrr v dd = 2.7v to 20v, v cm = 0v t a = +25oc 106 130 db -40oc t a +125oc 100 quiescent current per amplifer i dd r load = infnity t a = +25oc 1.2 1.6 ma -40oc t a +125oc 1.8 power-up time t on 20 s dc characteristics input common-mode range v cm guaranteed by cmrr test v ss - 0.05 v dd - 1.5 v common-mode rejection ratio cmrr v cm = v ss - 0.05v to v dd - 1.5v t a = +25oc 94 111 db -40oc t a +125oc 90 input offset voltage v os t a = +25oc 50 600 v -40oc t a +125oc 800 input offset voltage drift (note 3) tc v os 0.25 2.5 v/oc input bias current (note 3) i b t a = +25oc 0.02 0.5 pa -40oc t a +85oc 10 -40oc t a +125oc 50 maxim integrated 2 note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . absolute maximum ratings stresses beyond those listed under absolute 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 ab solute maximum rating conditions for extended periods may affect device reliability. package thermal characteristics electrical characteristics MAX44242 20v, low input bias-current, low-noise, dual op amplifer www.maximintegrated.com
(v dd = 10v, v ss = 0v, v in+ = v in- = v dd /2, r l = 10k to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values are at t a = +25c.) (note 2) note 2: all devices are production tested at t a = +25c. specifications over temperature are guaranteed by design. note 3: guaranteed by design. parameter symbol conditions min typ max units input offset current (note 3) i os t a = +25oc 0.04 0.5 pa -40oc t a +85oc 10 -40oc t a +125oc 25 open loop gain a vol 250mv v out v dd - 250mv t a = +25oc 134 145 db -40oc t a +125oc 129 input resistance r in differential 50 m? common mode 200 output short-circuit current to v dd or v ss noncontinuous 95 ma output voltage low v ol v out - v ss r load = 10k? to v dd /2 25 mv r load = 2k? to v dd /2 85 output voltage high v oh v dd - v out r load = 10k? to v dd /2 37 mv r load = 2k? to v dd /2 135 ac characteristics input voltage-noise density e n f = 1khz 5 nv/ hz input voltage noise 0.1hz f 10hz 1.6 v p-p input current-noise density i n f = 1khz 0.3 pa/ hz input capacitance c in 4 pf gain-bandwidth product gbw 10 mhz phase margin pm c load = 20pf 60 deg slew rate sr a v = 1v/v, v out = 2v p-p , 10% to 90% 8 v/s capacitive loading c load no sustained oscillation, a v = 1v/v 200 pf total harmonic distortion plus noise thd+n v out = 2v p-p , a v = +1v/v f = 1khz -124 db f = 20khz -100 emi rejection ratio emirr v rf_peak = 100mv f = 400mhz 35 db f = 900mhz 40 f = 1800mhz 50 f = 2400mhz 57 settling time to 0.01%, v out = 2v step, a v = -1v/v 1 s maxim integrated 3 electrical characteristics (continued) MAX44242 20v, low input bias-current, low-noise, dual op amplifer www.maximintegrated.com
(v dd = 10v, v ss = 0v, outputs have r l = 10k to v dd /2. t a = +25c, unless otherwise specifed.) 0 5 10 15 20 25 -600 -400 -200 0 200 400 600 occurrence n (%) input offset voltage drift (nv/ c) input offset voltage drift histogram toc02 histogram 900 1000 1100 1200 1300 -50 -25 0 25 50 75 100 125 150 supply current per amplifier ( a) temperature ( c) supply current per amplifier vs. temperature toc03 v in = v dd /2 no load v dd = 2.7v v dd = 5.5v v dd = 10v v dd = 15v v dd = 20v -140 -120 -100 -80 -60 -40 -20 0 20 -1 1 3 5 7 9 input offset voltage ( v) input common - mode voltage (v) input offset voltage vs. input common - mode voltage vs. temperature toc04 v in = v dd /2 10k ? t a = +125 c t a = +85 c t a = +25 c t a = - 40c -100 -50 0 50 100 150 200 250 300 0 2 4 6 8 10 input bias current (pa) input common - mode voltage (v) input bias current vs. input common - mode voltage vs. temperature toc05 t a = +125 c t a = +105 c t a = +85 c t a = +25 c 0 20 40 60 80 100 120 140 -50 -25 0 25 50 75 100 125 common - mode rejection ratio (db) temperature ( c) common - mode rejection ratio vs. temperature toc06 0 2 4 6 8 10 12 14 16 -250 -200 -150 -100 -50 0 50 100 150 200 250 occurrence n (%) input offset voltage ( v) input offset voltage histogram toc01 histogram 30 50 70 90 110 130 150 -50 -25 0 25 50 75 100 125 power - supply rejection ratio (db) temperature ( c) power - supply rejection ratio vs. temperature toc07 0 20 40 60 80 100 120 140 1 100 10000 1000000 ac cmrr (db) frequency (hz) ac cmrr vs. frequency toc08 maxim integrated 4 typical operating characteristics MAX44242 20v, low input bias-current, low-noise, dual op amplifer www.maximintegrated.com
(v dd = 10v, v ss = 0v, outputs have r l = 10k to v dd /2. t a = +25c, unless otherwise specifed.) -30 -10 10 30 50 70 90 110 130 10 1,000 100,000 10,000,000 a vol (db) frequency (hz) a vol vs. frequency toc10 -20 -15 -10 -5 0 5 10 10 1,000 100,000 10,000,000 small - signal response (db) frequency (hz) small - signal response vs. frequency toc11 100mv p - p input -30 -25 -20 -15 -10 -5 0 5 10 1,000 100,000 10,000,000 large - signal response (db) frequency (hz) large - signal response vs. frequency toc12 2v p - p input 0 5 10 15 20 25 30 35 40 10 100 1000 10000 100000 input voltage - noise density (nv/ hz ) frequency (hz) input voltage - noise density vs. frequency toc13 0.1 hz to 10 hz peak to peak noise toc14 v outn v inside v backup 1 v/div en = 1.6 v p - p 20 40 60 80 100 120 10 1,000 100,000 10,000,000 ac psrr (db) frequency (hz) ac psrr vs. frequency toc09 0 1 2 3 4 5 10 100 1000 10000 input current - noise density (pa/ hz ) frequency (hz) input current - noise density vs. frequency toc15 0 50 100 150 200 250 300 350 400 450 500 550 600 650 0 4 8 12 16 20 output swing high (mv) output source current (ma) output voltage high (v dd - v out ) vs. output source current toc16 maxim integrated 5 typical operating characteristics (continued) MAX44242 20v, low input bias-current, low-noise, dual op amplifer www.maximintegrated.com
(v dd = 10v, v ss = 0v, outputs have r l = 10k to v dd /2. t a = +25c, unless otherwise specifed.) 0 20 40 60 80 100 120 -50 -20 10 40 70 100 130 output voltage swing high (mv) temperature ( c) output voltage swing high vs. temperature toc18 r l = 10k ? r l = 2k ? 0 10 20 30 40 50 60 70 -50 -20 10 40 70 100 130 output voltage swing low v ol (mv) temperature ( c) output voltage swing low vs. temperature toc19 r l = 2k ? r l = 10k ? small - signal response vs. time toc20 100nf v outn v inside v backup 1 s/div v outn v inside v backup 50mv/div 50mv/div v in v out no load 0.001 0.01 0.1 1 10 100 100 1000 10000 100000 resistive load (k ? ) capacitive load (pf) stability vs. capacitive load and resistive load stable toc22 unstable large - signal response vs. time toc21 1 s/div v outn v inside v backup toc21 1 s/div v outn v inside v backup no load v in 1v/div v out 1v/div 0.01 0.1 1 10 100 100 1000 10000 100000 isolation resistance r iso ( ? ) capacitive load (pf) stability vs. capacitive load and isolation resistor toc23 stable unstable 0 50 100 150 200 250 300 350 400 450 500 550 600 0 5 10 15 20 25 30 output swing low (mv) output sink current (ma) output voltage low (v out ) vs. output sink current toc17 maxim integrated 6 typical operating characteristics (continued) MAX44242 20v, low input bias-current, low-noise, dual op amplifer www.maximintegrated.com
(v dd = 10v, v ss = 0v, outputs have r l = 10k to v dd /2. t a = +25c, unless otherwise specifed.) 0 20 40 60 80 100 10 100 1000 10000 emi rejection ratio (db) frequency (mhz) emirr vs. frequency toc29 -120 -100 -80 -60 -40 -20 0 0 2 4 6 8 10 total harmonic distortion (db) frequency (hz) total harmonic distortion vs. input frequency vs. amplitude 1khz input frequency toc26 r load = 10k ? 20khz input frequency -120 -100 -80 -60 -40 -20 0 1 10 100 1000 10000 100000 1000000 crosstalk (db) frequency (hz) crosstalk vs. frequency toc27 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 total harmonic distortion (db) frequency (hz) total harmonic distortion vs. frequency 2v p - p input toc25 r load = 600 ? r load = 1k ? r load = 10k ? maxim integrated 7 typical operating characteristics (continued) MAX44242 20v, low input bias-current, low-noise, dual op amplifer www.maximintegrated.com
detailed description combining high input impedance, low input bias current, wide bandwidth, and fast settling time, the MAX44242 is an ideal amplifier for driving precision analog-to-digital inputs and buffering digital-to-analog converter outputs. input bias current the MAX44242 features a high-impedance cmos input stage and a special esd structure that allows low input bias current operation at low-input, common-mode volt - ages. low input bias current is useful when interfacing with high-ohmic or capacitive sensors and is beneficial for designing transimpedance amplifiers for photodiode sen - sors. this makes the device ideal for ground-referenced medical and industrial sensor applications. integrated emi filter electromagnetic interference (emi) noise occurs at higher frequency that results in malfunction or degradation of electrical equipment. the MAX44242 has an input emi filter to avoid the output from getting affected by radio frequency interference. the emi filter, composed of passive devices, presents signifi - cant higher impedance to higher frequencies. high supply voltage range the device features 1.2ma current consumption per channel and a voltage supply range from either 2.7v to 20v single supply or 1.35v to 10v split supply. pin name function 1 outa channel a output 2 ina- channel a negative input 3 ina+ channel a positive input 4 v ss negative supply voltage. connect v ss to ground if single supply is used. 5 inb+ channel b positive input 6 inb- channel b negative input 7 outb channel b output 8 v dd positive supply voltage 8 max/sot-23 top view MAX44242 v ss 1 2 ina- ina+ outa 3 4 inb- inb+ 8 7 v dd outb 6 5 + maxim integrated 8 pin description pin confguration MAX44242 20v, low input bias-current, low-noise, dual op amplifer www.maximintegrated.com
typical application circuit high-impedance sensor application high impedance sources like ph sensor, photodiodes in applications require negligible input leakage currents to the input transimpedance/buffer structure. the MAX44242 benefits with clean and precise signal conditioning due to its input structure. the device interfaces to both current-output sensors (photodiodes) (figure 1), and high-impedance voltage sources (piezoelectric sensors). for current output sen - sors, a transimpedance amplifier is the most noise-effi - cient method for converting the input signal to a voltage. high-value feedback resistors are commonly chosen to create large gains, while feedback capacitors help stabi - lize the amplifier by cancelling any poles introduced in the feedback loop by the highly capacitive sensor or cabling. a combination of low-current noise and low-voltage noise is important for these applications. take care to calibrate out photodiode dark current if dc accuracy is important. the high bandwidth and slew rate also allow ac signal processing in certain medical photodiode sensor applica - tions such as pulse-oximetry. for voltage-output sensors, a noninverting amplifier is typically used to buffer and/or apply a small gain to the input voltage signal. due to the extremely high impedance of the sensor output, a low input bias current with minimal temperature variation is very important for these applications. transimpedance amplifer as shown in figure 2, the noninverting pin is biased at 2v with c2 added to bypass high-frequency noise. this bias voltage to reverse biases the photodiode d1 at 2v which is often enough to minimize the capacitance across the junction. hence, the reverse current (i r ) produced by the photodiode as light photons are incident on it, a propor - tional voltage is produced at the output of the amplifier by the given relation: out r v i r1 = the addition of c1 is to compensate for the instability caused due to the additional capacitance at the input (junction capacitance c j and input capacitance of the op amp c in ), which results in loss of phase margin. more information about stabilizing the transimpedance amplifier can be found in application note 5129 : stabilize your transimpedance amplifier . figure 1. high-impedance source/sensor preamp application d 1 max 44242 + 5 v 5 v c 1 15 nf r 1 100 k? r 2 30 k? c 2 10 nf r 3 20 k? maxim integrated 9 MAX44242 20v, low input bias-current, low-noise, dual op amplifer www.maximintegrated.com
+denotes lead(pb)-free/rohs-compliant package. part temp range pin- package top mark MAX44242aka+ -40oc to +125oc 8 sot23 aetk MAX44242aua+ -40oc to +125oc 8 max package type package code outline no. land pattern no. 8 sot23 k8+5 21-0078 90-0176 8 max u8+1 21-0036 90-0092 maxim integrated 10 package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.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. chip information process: bicmos ordering information MAX44242 20v, low input bias-current, low-noise, dual op amplifer www.maximintegrated.com
revision number revision date description pages changed 0 12/13 initial release ? 2013 maxim integrated products, inc. 11 revision history maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifcations 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. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. MAX44242 20v, low input bias-current, low-noise, dual op amplifer for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.

▲Up To Search▲

Price & Availability of MAX44242

	To Download MAX44242 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .