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| v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 1 AS111 rev. 1.5 7/03 general description the AS111 is a voltage comparator that has input currents nearly a thousand times lower than other similar devices like. it is also designed to operate over a wider range of supply voltages: from standard 15v op amp supplies down to the single 5v supply used for ic logic. their output is compatible with rtl, dtl and ttl as well as mos circuits. further, they can drive lamps or relays, switching voltages up to 50v at currents as high as 50 ma. both the inputs and the outputs of the AS111 can be isolated from system ground, and the output can drive loads referred to ground, the positive supply or the negative supply. offset balancing and strobe capability are provided and outputs can be wire or?ed. although slower than some devices (200 ns response time vs 40 ns), this device is also much less prone to spurious oscillations. features ? operates from single 5v supply ? input current: 150 na max. over temperature ? offset current: 20 na max. over temperature ? differential input voltage range: 30v ? power consumption: 135 mw at 15v options markings ? packages 8 pin ceramic dip c008 14 pin ceramic dip c014 20 pin ceramic lcc e020 8 lead metal can to08 ? temperature ranges extended (-55 o c to +125 o c) xt mil-std-883 paragraph 1.2.1 (-55 o c to +125 o c) /883 available as military specifications ? smd 5962-86877 ? m38510/10304b ? mil-std-883, 1.2.1 voltage comparator for more products and information please visit our web site at www.austinsemiconductor.com pin assignment (top view) 1 2 3 4 8 7 6 5 gnd input+ input- v - v + output balance/ strobe balance 1 2 3 4 5 6 7 14 13 12 11 10 9 8 nc gnd input+ input- nc v - balance nc nc nc v + nc output balance/ strobe 8 pin ceramic dip (c008) 14 pin ceramic dip (c014) 8 lead metal can (to08) 20 pin ceramic lcc (e020) v + gnd input+ input- balance v - balance/strobe output 1 2 3 4 5 6 7 8
v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 2 AS111 rev. 1.5 7/03 typical applications 3 v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 3 AS111 rev. 1.5 7/03 typical applications (continued) 3 note: do not ground strobe pin note 2: typical input current is 50pv with inputs strobed off. note 3: pin connections shown on schematic diagram and typical applications are for to08 metal can package. *stresses greater than those listed under "absolute maximum ratings" may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. absolute maximum ratings* ,5 total supply voltage (v 84 ).............................................................36v output to negative supply voltage (v 74 )....................................50v ground to negative supply voltage (v 14 )...................................30v differential input voltage.............................................................30v input voltage 4 ................................................................................15v output short circuit duration..................................................10 sec lead temperature (soldering, 10 sec).......................................260c voltage at stobe pin................................................................v + -5v note 4: this rating applies for 15 supplies. the positive input voltage limit is 30v above the negative supply. the negative input vol tage limit is equal to the negative supply voltage or 30v below the positive supply, whichever is less. note 5: the maximum junction temperature of the AS111 is 150c. for operating at elevated temperatures, devices in the to08 package mu st be derated based on a thermal resistance of 165c/w, junction to ambient, or 20c/w, junction to case. the thermal resistance o f the dual-in-line package is 110c/w, junction to ambient. v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 4 AS111 rev. 1.5 7/03 electrical characteristics 6 parameter conditions min typ max units input offset voltage 7 t a = 25c, r s < 50k 0.7 3.0 mv input offset current t a = 25c 4.0 10 na input bias current t a = 25c 60 100 na voltage gain t a = 25c 40 200 v/mv response time 8 t a = 25c 200 ns saturation voltage v in < -5mv, i out = 50ma, t a = 25c 0.75 1.5 v strobe on current 9 t a = 25c 2.0 5.0 ma output leakage current v in > 5mv, i out = 35v, t a = 25c, i strobe = 3ma 0.2 10 na input offset voltage 7 r s < 50k 4.0 mv input offset current 7 20 na input bias current 150 na input voltage range v+ = 15v, v- = -15v, pin 7 pull-up may go to 5v -14.5 13.8, -14.7 13.0 v saturation voltage v + > 4.5v, v - = 0, v in < -6mv, i out < 8ma 0.23 0.4 v output leakage current v in > 5mv, i out = 35v 0.1 0.5 a positive supply current t a = 25c 5.1 6.0 ma negative supply current t a = 25c 4.1 5.0 ma note 6: these specifications apply for vs=15v and ground pin at ground, and -55c < t a < +125c, unless otherwise stated. the offset voltage, offset current and bias current specifications apply for any supply voltage from a single 5v supply up to 15v supplies. note 7: the offset voltages and offset currents given are the maximum values required to drive the output within a volt of either supply with a 1ma load. thus, these parameters define an error band and take into account the worst-case effects of voltage gain and r s . note 8: the response time specified (see definitions) is for a 100 mv input step with 5 mv overdrive. note 9: this specification gives the range of current which must be drawn from the strobe pin to ensure the output is properly disabled. do not short the strobe pin to ground; it should be current driven at 3 to 5 ma. v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 5 AS111 rev. 1.5 7/03 typical performance characteristics v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 6 AS111 rev. 1.5 7/03 typical performance characteristics (continued) v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 7 AS111 rev. 1.5 7/03 typical performance characteristics (continued) circuit techniques for avoiding oscillations in comparator applications when a high-speed comparator such as the AS111 is used with fast input signals and low source impedances, the output response will normally be fast and stable, assuming that the power supplies have been bypassed (with 0.1 f disccapacitors), and that the output signal is routed well away from the inputs (pins 2 and 3) and also away from pins 5 and 6. however, when the input signal is a voltage ramp or a slow sine wave, or if the signal source impedance is high (1 kw to 100 kw), the comparator may burst into oscillation near the crossing-point. this is due to the high gain and wide bandwidth of comparators like the AS111. to avoid oscillation or instability in such a usage, several precautions are recom mended, as shown in figure 1 below. 1. the trim pins (pins 5 and 6) act as unwanted auxiliary inputs. if these pins are not connected to a trim-pot, they should be shorted together. if they are connected to a trim- pot, a 0.01 f capacitor c1 between pins 5 and 6 will minimize the susceptibility to ac coupling. a smaller capacitor is used if pin 5 is used for positive feedback as in figure 1. 2. certain sources will produce a cleaner comparator out put waveform if a 100 pf to 1000 pf capacitor c2 is connected directly across the input pins. 3. when the signal source is applied through a resistive network, r s , it is usually advantageous to choose an r s ? of substantially the same value, both for dc and for dynamic (ac) considerations. carbon, tin-oxide, and metal-film resistors have all been used successfully in comparator input circuitry. inductive wirewound resistors are not suitable. (continued) v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 8 AS111 rev. 1.5 7/03 application hints (continued) 4. when comparator circuits use input resistors (eg. summing resistors), their value and placement are particularly important. in all cases the body of the resistor should be close to the device or socket. in other words there should be very little lead length or printed-circuit foil run between comparator and resistor to radiate or pick up signals. the same applies to capacitors, pots, etc. for example, if r s =10 kw, as little as 5 inches of lead between the resistors and the input pins can result placing resistors close to the comparator. 5. since feedback to almost any pin of a comparator can result in oscillation, the printed-circuit layout should be engineered thoughtfully. preferably there should be a groundplane under the AS111 circuitry, for example, one side of a double-layer circuit card. ground foil (or, positive supply or negative supply foil) should extend between the output and the inputs, to act as a guard. the foil connections for the inputs should be as small and compact as possible, and should be essentially surrounded by ground foil on all sides, to guard against capacitive coupling from any high-level signals (such as the output). if pins 5 and 6 are not used, they should be shorted together. if they are connected to a trim-pot, the trim-pot should be located, at most, a few inches away from the AS111, and the 0.01 f capacitor should be installed. if this capacitor cannot be used, a shielding printed-circuit foil may be advisable between pins 6 and 7. the power supply bypass capacitors should be located within a couple inches of the AS111. (some other comparators require the power-supply bypass to be located immediately adjacent to the comparator.) 6. it is a standard procedure to use hysteresis (positive feedback) around a comparator, to prevent oscillation, and to avoid excessive noise on the output because the comparator is a good amplifier for its own noise. in the circuit of figure 2, the feedback from the output to the positive input will cause about 3 mv of hysteresis. however, if r s is larger than 100 ? , such as 50 k ? , it would not be reasonable to simply increase the value of the positive feedback resistor above 510 k ? . the circuit of figure 3 could be used, but it is rather awkward. see the notes in paragraph 7 below. 7. when both inputs of the AS111 are connected to active signals, or if a high-impedance signal is driving the positive input of the AS111 so that positive feedback would be disruptive, the circuit of figure 1 is ideal. the positive feedback is to pin 5 (one of the offset adjustment pins). it is sufficient to cause 1 to 2 mv hysteresis and sharp transitions with input triangle waves from a few hz to hundreds of khz. the positive-feedback signal across the 82 ? resistor swings 240 mv below the positive supply. this signal is centered around the nominal voltage at pin 5, so this feedback does not add to the v os of the comparator. as much as 8 mv of v os can be trimmed out, using the 5 k ? pot and 3 k ? resistor as shown. 8. these application notes apply specifically to the AS111 family of comparators, and are applicable to all high-speed comparators in general, (with the exception that not all comparators have trim pins). note: pin connections shown are for the to08 can package. v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 9 AS111 rev. 1.5 7/03 application hints (continued) typical applications (pin numbers refer to to08 can package) v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 10 AS111 rev. 1.5 7/03 typical applications (pin numbers refer to to08 can package)(continued) 10hz to 10khz voltage controlled oscillator v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 11 AS111 rev. 1.5 7/03 typical applications (pin numbers refer to to08 can package)(continued) v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 12 AS111 rev. 1.5 7/03 typical applications (pin numbers refer to to08 can package)(continued) v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 13 AS111 rev. 1.5 7/03 typical applications (pin numbers refer to to08 can package)(continued) v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 14 AS111 rev. 1.5 7/03 typical applications (pin numbers refer to to08 can package)(continued) v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 15 AS111 rev. 1.5 7/03 schematic diagram 20 note 20: pin connections shown on schematic diagram are for the to08 can package. v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 16 AS111 rev. 1.5 7/03 asi case (package designator c008) smd 5962-86877, case outline p mechanical definitions* *all measurements are in inches. min max a --- 0.200 b 0.014 0.026 b2 0.045 0.065 c 0.008 0.018 d --- 0.405 e 0.220 0.310 e ea l 0.125 0.200 q 0.015 0.060 s1 0.005 --- s2 0.005 --- symbol asi specifications 0.100 bcs 0.300 bsc v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 17 AS111 rev. 1.5 7/03 asi case (package designator c014) m38510/10304b, case outline c mechanical definitions* *all measurements are in inches. min max a --- 0.200 b 0.014 0.026 b2 0.045 0.065 c 0.008 0.018 d --- 0.785 e 0.220 0.310 e ea l 0.125 0.200 q 0.015 0.060 s1 0.005 --- s2 0.005 --- symbol asi specifications 0.100 bcs 0.300 bsc v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 18 AS111 rev. 1.5 7/03 asi case (package designator e020) smd 5962-86877, case outline 2 mechanical definitions* *all measurements are in inches. e2 l1 b1 d2 l e e d1 e1 d a a1 min max a 0.060 0.100 a1 0.050 0.088 b1 0.022 0.028 d/e 0.342 0.358 d1/e1 --- 0.358 d2/e2 e l 0.045 0.055 l1 0.075 0.095 0.050 bsc symbol asi specifications 0.200 bsc v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 19 AS111 rev. 1.5 7/03 asi case (package designator to08) smd 5962-86877, case outline g mechanical definitions* *all measurements are in inches. min max a 0.165 0.185 b 0.016 0.019 b1 0.016 0.021 b2 0.016 0.024 d 0.335 0.375 d1 0.305 0.335 d2 0.110 0.160 e e1 f --- 0.040 k 0.027 0.034 k1 0.027 0.045 l 0.500 0.750 l1 --- 0.050 l2 0.250 --- q 0.010 0.045 0.200 bsc 0.100 bsc 45 bsc 45 bsc symbol asi specifications v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 20 AS111 rev. 1.5 7/03 *available processes: xt = extended temperature range -55 o c to +125 o c /883c = mil-std-883 paragraph 1.2.1 -55 o c to +125 o c ordering information example: AS111c008/883c device number package type process AS111 c008 /* example: AS111c014/xt device number package type process AS111 c014 /* example: AS111e020/xt device number package type process AS111 e020 /* example: AS111to08/883c device number package type process AS111 to08 /* v v v v v olta olta olta olta olta g g g g g e e e e e comparator comparator comparator comparator comparator AS111 austin semiconductor, inc. austin semiconductor, inc. reserves the right to change products or specifications without notice. 21 AS111 rev. 1.5 7/03 asi to dscc part number cross reference * asi part number is for reference only. orders received referencing the smd part number will be processed per the smd. asi p art number dscc p art number AS111c008/883c 5962-8687701pa AS111e020/883c 5926-86877012a AS111to08/883c 5962-8687701ga AS111c008/883c m38510/10304bpa AS111e020/883c m38510/10304b2a AS111to08/883c m38510/10304bga AS111c014/883c m38510/10304bca |
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