lm392 low power operational amplifier/voltage comparator general description the lm392 series consists of 2 independent building block circuits. one is a high gain, internally frequency compen- sated operational amplifier, and the other is a precision voltage comparator. both the operational amplifier and the voltage comparator have been specifically designed to op- erate from a single power supply over a wide range of voltages. both circuits have input stages which will common-mode input down to ground when operating from a single power supply. operation from split power supplies is also possible and the low power supply current is indepen- dent of the magnitude of the supply voltage. application areas include transducer amplifier with pulse shaper, dc gain block with level detector, vco, as well as all conventional operational amplifier or voltage comparator cir- cuits. both circuits can be operated directly from the stan- dard 5 v dc power supply voltage used in digital systems, and the output of the comparator will interface directly with either ttl or cmos logic. in addition, the low power drain makes the lm392 extremely useful in the design of portable equipment. advantages n eliminates need for dual power supplies n an internally compensated op amp and a precision comparator in the same package n allows sensing at or near ground n power drain suitable for battery operation n pin-out is the same as both the lm358 dual op amp and the lm393 dual comparator features n wide power supply voltage range single supply: 3v to 32v dual supply: 1.5v to 16v n low supply current drain e essentially independent of supply voltage: 600 a n low input biasing current: 50 na n low input offset voltage: 2 mv n low input offset current: 5 na n input common-mode voltage range includes ground n differential input voltage range equal to the power supply voltage additional op amp features n internally frequency compensated for unity gain n large dc voltage gain: 100 db n wide bandwidth (unity gain): 1 mhz n large output voltage swing: 0v to v + ? 1.5v additional comparator features n low output saturation voltage: 250 mv at 4 ma n output voltage compatible with all types of logic systems connection diagram (amplifier a = comparator) (amplifie r b = operational amplifier) dual-in-line package ds007793-1 (top view) order number lm392m or LM392MX see ns package number m08a order number lm392n see ns package number n08e august 2000 lm392 low power operational amplifier/voltage comparator ? 2001 national semiconductor corporation ds007793 www.national.com
absolute maximum ratings (note 1) if military/aerospace specified devices are required, please contact the national semiconductor sales office/ distributors for availability and specifications. lm392 supply voltage, v + 32v or 16v differential input voltage 32v input voltage ?0.3v to +32v power dissipation (note 2) molded dip (lm392n) 820 mw small outline package (lm392m) 530 mw output short-circuit to ground (note 3) continuous input current (v in < ?0.3 v dc ) (note 4) 50 ma operating temperature range 0c to +70c storage temperature range ?65c to +150c lead temperature (soldering, 10 seconds) 260c esd rating to be determined. soldering information dual-in-line package soldering (10 seconds) 260c small outline package vapor phase (60 seconds) 215c infrared (15 seconds) 220c see an-450 asurface mounting methods and their effect on product reliabilityo for other methods of soldering surface mount devices. electrical characteristics (v + =5v dc ; specifications apply to both amplifiers unless otherwise stated) (note 5) parameter conditions lm392 units min typ max input offset voltage t a = 25c, (note 6) 2 5mv input bias current in(+) or in(?), t a =25c, (note 7) , v cm = 0v 50 250 na input offset current in(+) ? in(?), t a = 25c 5 50 na input common-mode voltage range v + =30v dc ,t a = 25c, (note 8) 0 v + ?1.5 v supply current r l = ,v + =30v 1 2 ma supply current r l = ,v + = 5 v 0.5 1 ma amplifier-to-amplifier coupling f = 1 khz to 20 khz, t a = 25c, input referred, (note 9) ?100 db input offset voltage (note 6) 7mv input bias current in(+) or in(?) 400 na input offset current in(+) ? in(?) 150 na input common-mode voltage range v + =30v dc , (note 8) 0 v + ?2 v differential input voltage keep all v in ' s 3 0v dc (or v ? , if used ) (note 10) 32 v lm392 www.national.com 2
electrical characteristics (continued) (v + =5v dc ; specifications apply to both amplifiers unless otherwise stated) (note 5) parameter conditions lm392 units min typ max op amp only large signal voltage gain v + =15v dc ,v o swing = 1 v dc to 11 v dc , r l =2k w ,t a = 25c 25 100 v/mv output voltage swing r l =2k w ,t a = 25c 0 v + ?1.5 v common-mode rejection ratio dc, t a = 25c, v cm =0,v dc to v + ?1.5 v dc 65 70 db power supply rejection ratio dc, t a = 25c 65 100 db output current source v in(+) =1v dc ,v in(?) =0v dc , v + =15v dc ,v o =2v dc ,t a = 25c 20 40 ma output current sink v in(?) =1v dc ,v in(+) =0v dc , v + =15v dc ,v o =2v dc ,t a = 25c 10 20 ma v in(?) =1v dc ,v in(+) =0v dc , v + =15v dc ,v o =200 mv, t a = 25c 12 50 a input offset voltage drift r s =0 w 7 v/c input offset current drift r s =0 w 10 pa dc /c comparator only voltage gain r l 3 15 k w ,v + =15v dc ,t a = 25c 50 200 v/mv large signal response time v in = ttl logic swing, v ref = 1.4 v dc v rl =5v dc ,r l = 5.1 k w ,t a = 25c 300 ns response time v rl =5v dc ,r l = 5.1 k w ,t a = 25c 1.3 s output sink current v in(?) =1 v dc ,v in(+) =0v dc , v o 3 1.5 v dc ,t a = 25c 616 ma saturation voltage v in(?) 3 1v dc ,v in(+) =0, i sink 4 ma, t a = 25c 250 400 mv v in(?) 3 1v dc ,v in(+) =0, i sink 4ma 700 mv output leakage current v in(?) =0,v in(+) 3 1v dc , v o =5v dc ,t a = 25c 0.1 na v in(?) =0,v in(+) 3 1v dc , v o =30v dc 1.0 a note 1: aabsolute maximum ratingso indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device i s functional, but do not guarantee specific performance limits. note 2: for operating at temperatures above 25c, the lm392 must be derated based on a 125c maximum junction temperature and a thermal resistance of 122c/w which applies for the device soldered in a printed circuit board, operating in still air ambient. the dissipation is the total of both amplifie rs e use external resistors, where possible, to allow the amplifier to saturate or to reduce the power which is dissipated in the integrated circuit. note 3: short circuits from the output to v + can cause excessive heating and eventual destruction. when considering short circuits to ground, the maximum output current is approximately 40 ma for the op amp and 30 ma for the comparator independent of the magnitude of v + . at values of supply voltage in excess of 15v, continuous short circuits can exceed the power dissipation ratings and cause eventual destruction. note 4: this input current will only exist when the voltage at any of the input leads is driven negative. it is due to the collector-base junction of the input pnp transistors becoming forward biased and thereby acting as input diode clamps. in addition to this diode action, there is also lateral npn parasitic tr ansistor action on the ic chip. this transistor action can cause the output voltages of the amplifiers to go to the v + voltage level (or to ground for a large overdrive) for the time duration that an input is driven negative. this is not destructive and normal output states will re-establish when the input voltage, which was negati ve, again returns to a value greater than ?0.3v (at 25c). note 5: these specifications apply for v + = 5v, unless otherwise stated. for the lm392, temperature specifications are limited to 0c t a +70c. note 6: at output switch point, v o . 1.4v, r s =0 w with v + from 5v to 30v; and over the full input common-mode range (0v to v + ? 1.5v). note 7: the direction of the input current is out of the ic due to the pnp input stage. this current is essentially constant, independent of the state of the outpu tso no loading change exists on the input lines. note 8: the input common-mode voltage or either input signal voltage should not be allowed to go negative by more than 0.3v. the upper end of the common-mode voltage range is v + ? 1.5v, but either or both inputs can go to 32v without damage. note 9: due to proximity of external components, insure that coupling is not originating via the stray capacitance between these external parts. this typica lly can be detected as this type of capacitive coupling increases at higher frequencies. note 10: positive excursions of input voltage may exceed the power supply level. as long as the other input voltage remains within the common-mode range, the comparator will provide a proper output state. the input voltage to the op amp should not exceed the power supply level. the input voltage state must not be less than ?0.3v (or 0.3v below the magnitude of the negative power supply, if used) on either amplifier. note 11: the response time specified is for a 100 mv input step with 5 mv overdrive. for larger overdrive signals 300 ns can be obtained. lm392 www.national.com 3
schematic diagram application hints please refer to the application hints section of the lm193 and the lm158 datasheets. ds007793-2 lm392 www.national.com 4
physical dimensions inches (millimeters) unless otherwise noted s.o. package (m) order number lm392m or LM392MX ns package number m08a molded dual-in-line package (n) order number lm392n ns package number n08e lm392 www.national.com 5
notes life support policy national's products are not authorized for use as critical components in life support devices or systems without the express written approval of the president and general counsel of national semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. national semiconductor corporation americas email: support@nsc.com national semiconductor europe fax: +49 (0) 180-530 85 86 email: europe.support@nsc.com deutsch tel: +49 (0) 69 9508 6208 english tel: +44 (0) 870 24 0 2171 fran?ais tel: +33 (0) 1 41 91 8790 national semiconductor asia pacific customer response group tel: 65-2544466 fax: 65-2504466 email: ap.support@nsc.com national semiconductor japan ltd. tel: 81-3-5639-7560 fax: 81-3-5639-7507 www.national.com lm392 low power operational amplifier/voltage comparator national does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and national reserves the righ t at any time without notice to change said circuitry and specifications.
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