LM111

LT111A LINER

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TECHNOLOGY ‘Voltage Comparator FEATURES DESCRIPTION = Guaranteed Max Input Offset Voltage 1.0mV The LT111A is an improved version of the LM111 gen- = Guaranteed Max Input Offset Current 5nA eral purpose comparator. These new devices offer = Guaranteed Max Response Time 250nS maximum input offset voltage of 1.0mV and input off- = Guaranteed Min. Voltage Gain 200,000 set current of 5.0nA with a maximum response time of = +30V Differential Input Voltage 250ns. The LT111A operates from a single 5V supply to = Drives 50mA Loads At Up To 50V. +15V supplies and can drive up to 50mA loads re- = ‘2 The Power Dissipation For LT111A/LT311A ferred to ground or either supply. A separate output ground pin allows output signals to be isolated from analog ground. The versatility of the LT111A is enhanced by an input Stage design which allows differential input signals of up to +30V. Offset balancing, strobe capability and the ability to “OR” the output is also included. These APPLICATIONS features plus Linear Technology Corporation’s ad- vanced processing and reliability enhancements make = General Purpose Comparator the LT111A an ideal choice for most comparator appli- = Zero Crossing Detector cations. For higher performance requirements, see the = Voltage To Frequency Converter LT1011. For operation up to 200°C, see LT111X data sheet. SS Low Drift R/C Oscillator . 25k < Rg < 200k9 +18 S Transfer Function +15V [| 50 ~ CET TTT yy) ck" rey wo IT conecroe = gots Foti > > =« LITT he re oP [Seg 7AHCO4's 3 FETA [eae Lc] 2 OLA > BCT ern e o EEC +157 Li TT TN ‘ok oL LLL VET) -05 -03 -010 01 03 05 0S TRW TYPE TAS, 1+ 1209p" = DIFFERENTIAL INPUT VOLTAGE (mV) C, = .015 = POLYSTYRENE — 120ppm/°C + 30ppm WESCO TYPE 32-P NOTE: COMPARATORCONTRIBUTES < 10ppm/°C DRIFT FOR FREQUENCIES BELOW 10kHz Ca AT Unite 6-85

ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION Supply Voltage . Output to Negative Supply ROUND oe OUTPUT NUMBER (pin 7 to pin 4) INPUT o> © BALANCE! LT111AH LTVM1A/LM111.. 00 SOV wneut Qo SB parance LM111H Ground to Negative Suppl (pin 110 pin) once ceecceceeeeeees 30V ro AEE ay LM311H Operating Temperature Range (Note 2) INPUT 3 6 BALANCE/ STROBE ELECTRICAL CHARACTERISTICS y, = =-15v, 1, = 25°C uniess othorwise noted. (Note 3, 4) SUS te aay 2 40 (Note 3,4) sisal ataae hnlt 20.0 150 150 fo. _|laweSipalvtage Gan [woe? | «aw | ov [RespnseTing NS | at] Saturation Voltage Vin —5mV, lout = SOMA 075 (15 075 15 Vv V+245V, V- =0 aE ALS] | Stabe ONGure [wes | «eso \\graoge = SMA 01 05 Of 05 pA Input Voltage Range V+ = 15V, = 15V 145 (138) 130 |-145 [138] 130 v reaimmwsy ("| Lite} PME (SF P| a [Nepawesinycuren TT tas [at so | Shading of a specification highlights those items which offer key improvements in parametric performance or guaranteed test limits provided for the first time. ee 6-86 LT WAR

ELECTRICAL CHARACTERISTICS y, = + 15v, 1, = 25°C unless otherwise noted. srwso._|paraweren ___—_|conornons [om He ax | am SF" wax | ws Vos Input Offset Voltage Ry < 50k asim Veen sant 20 75 mv (Note 3, 4) ARE PE OU 10 los Input Offset Current Be oO AGE a) mA SU aa 70 lb Input Bias Current 60 100 100 250 nA Notes (epuieieunaas, ll 300 [Repretig es aae[ae Saturation Voltage Vw < — 10mV, oy = SOMA 075 15 075 15 v V+>45V, V- =0 _ Vv <= —10MV, Isa <8MA 023° «04 023 «(04 v Sis ONG frees | oo Output Leakage Current Vin = 10MV, Voyr = 35V 02 50 mA Isrroee = 3A 01 05 nA (14.7 \\-14.7 Se The @ denotes the specifications which apply over the full operating Note 4: Offset voltages and offset currents shown are the maximum temperature range. values required to drive the output within a volt of either supply with a 1mA load. These parameters define an error band and take into account the worst case effects of voltage gain and input impedance. Note 5: Response time is specified for a 100mV input step with SmV Note 1; Applicable for + 15V supplies. The positive input voltage mit Overdrive with the collector output terminated with a 5000 pullup is 30V above the negative supply. The negative input voltage limit is ° . the negative supply. Note 6: Do nat shart the Strobe pin to ground. It should be current . = 150° driven at 3 to SmA for the shortest strobe time. Currents as low as Note 2: 7; max. = 150°C for the LT 111A and 95°C for the LT311A. 500,,A will strobe the LT111A if speed is not important. External Note 3: Offset voltage, offset current and bias current specifications leakage on the strobe pin in excess of 0.2uA when the strobe is “off” apply for any supply voltage from a single SV up to + 15V supplies. can cause offset voltage shifts. Note 7: Ry =1kM, —10V<Voyps14.5V a OO LT Wee 6-87

Input Bias Current Input Offset Current Offset Error

400 T 30 100 ae EE

= 300 <1 (SHORT PINS = oh = wee / RS f.. = { 5,6, AND 8) BON 3 Aa f.. {| 2 t r e | S ines Se oon sate ee SG @ |- TN aevateo 5 | pS ag Fa IT > 5 0[ 4 (SHORT PINS, 24 eee : 2 10 es a a 5 +__,_| 5,6, ano 8) 5 NE. : Be ze NORMAL = SSAnormar —t a : ssa — =) Vos = Vos ~ Rel ee 2 oil ee 0 0 ee | =85-35-15 5 25 45 65 85 105125 85-35-15 5 25 45 65 85 105125 10k 100k 1M 10M TEMPERATURE (°C) TEMPERATURE (°C) INPUT RESISTANCE (2) Input Characteristics Common Mode Limits Transfer Function

180 T V+ 50

wlio tl =v os | __ REFERRED To SUPPLY VOLTAGES TT t Ta = 25°C - 7 T j im Pe en to} +f 4 Lp 40 aan a “18 - — = 4 FA ih -agf i 3 x9 jot 2 80 ! I ae s +t a ; _ 1 5 9 oe o3 | — 5 1 | | fp oeeneeeeee eee a1 ee Ve 0 v- ol Ty 16 -12-8 -4 0 4 8 12 16 ~50-25 0 25 80 75 100 125 -05 -03 -01001 03 05 DIFFERENTIAL INPUT VOLTAGE (V) TEMPERATURE (°C) DIFFERENTIAL INPUT VOLTAGE (mV) Response Time for Various Response Time for Various Input Overdrives Input Overdrives Collector Output Saturation Voltage = a ery g 5 ee 09 a 3 2|-am itp f-——— Ez 2 | SmV— - £ os 3 06 |} =%5r0 = 1 + Wy — 5000 2 14 |-2mv: + 3 0s ee <_ Pres i vs 5 S om —— Vou = ~ a J E oa we a 3 —50 -f Ns = 2 18V- ob 20 5 — 100 bed ane ot z = 0 0 02 04 06 08 0 02 04 06 08 5 10 15 20 25 30 35 40 45 50 TIME (uS) TIME (4S) SINK CURRENT (mA) Oe eee 6-88 LT NEAR

Response Time Using GND Response Time Using GND Pin as Output Pin as Output Output Limiting Characteristics = 140 07 85 = is Lo v- aT = BC 5 0 i Z | ve 7” oe | 2 o/h ff” 5 0 : . tow FA - eS 3 a | 7 Vout = {ov = | gm a) & ug = -10 aaa * = 19) 2 . 5 x 3 B j E v 3 60 > 033 So -15 + wy -15 — = Zz 3 ee = 10 2 ncn 2 1V Ew ann ORF CREAT 2s PSH sae | i —— ff 7 = ] E4 0 0 0 1 2 3 4 0 1 2 3004 0 5 10 i TIME (x8) TIME (x5) OUTPUT VOLTAGE (V) Supply Current Supply Current Leakage Current vs vs vs Supply Voltage Temperature Temperature 5 6 7 07 POSITIVE SUPPLY | i | | i zw ES & = | COLLECTOR OUTPUT “LO” =z 4 + POSITIVE SUPPLY — — S aol Z 3} — & COLLECTOR OUTPUT “LO” Fl > rad { | 5 a S o-3 b= z RY FA | a3 — 310 cS 3 i l S2 SS Fs - > os 1 | POSITIVE AND NEGATIVE SUPPLY 7 | | | Sto" Lenses ] COLLECTOR OUTPUT “HI 1} POSITIVE AND NEGATIVE SUPPLY aS } of | | ' COLLECTOR OUTPUT “HI” | 0 i ! 0 i 0" 0 5 0 68 20 2% 2% -50-25 0 25 50 75 100 125 % 4 6 85 105 125 SUPPLY VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) SS ey Offset Balancing Strobing Increasing Input Stage Current 3.0k 2 v z | Le + 3 v 6 2 | 2 6 6 ™

8 STROBE 3 7

= Increases typical common mode slew Note: Pin Connections Shown Note: Do Not Ground rate from 7.0 V/uS are for TO-5 package Strobe Pin, to 18V/u8. LS 7 @ Arie 6-89

a TYPICAL APPLICATIONS Driving Load Referenced Driving Load Referenced Driving Ground Referred Load To Positive Supply To Negative Supply ve ve ver vt 3 8 Puoso __2 _ 2 8 u INPUTS* ul INPUTS * z 2 y 4 3 . + 3 1 AD 4 Q)u vr V~ OR GROUND (9) v- = V+ + CAN BE GREATER OR LESS THAN V+ v * NOTE THAT INPUT * NOTE THAT INPUT POLARITY IS REVERSED POLARITY IS REVERSED WHEN USING PIN 1 AS. WHEN USING PIN 1 AS ‘OUTPUT . OUTPUT Window Detector ‘ Using Clamp Diodes To Improve Frequency Response” HIGH 2 i MIT U FROM 2 LADDER : INSIDE "WINDOW" NETWoRE u AND LOW Dy ourpur ABOVE HIGH Vw UMIT OR ‘BELOW LOW MIT Ry => ANALOG INPUT * RESPONSE TIME INCREASES TO ~500nS LOW 3 IF INPUT MUST SLEW 5V LIMIT 1 TO REACH THRESHOLD. = Crystal Oscillator Detector For Magnetic Transducer Vo =5v 50k 23k 85 ts > 00pt i ul our KHz Sd hr il La ° MAGNETIC - 10k PICKUP SY 6-90 LT We

Low Drift R/C Oscillator Strobing Off Both Input* And Output Stages wT FROM D/A NETWORK C = 7 0015 > > ANALOG 3 ° 3 ie INPUT i> T4HCO4'S O1 nd ; > O.1uF T . + 02 TTL/CMOS (5¥) 10k 2N222 STROBE “ + 15V SAMPLE 10k 1.0k © 1% METAL FILM it ++ = TW TYPE MTR-5/+ 120ppm/°C = * TYPICAL INPUT CURRENT IS 50pA = C, = 015 = POLYSTYRENE — 120ppm/°C + 30ppm WESCO TYPE 32-P WITH INPUTS STROBED OFF. NOTE: COMPARATOR CONTRIBUTES < 10ppm/°C DRIFT FOR D0 NOT GROUND STROBE PIN FREQUENCIES BELOW 10KH2. Positive Peak Detector +18V 2.0k wear : 6 | ul 2 ol OUTPUT 10k 6 Lam 1.0M ode —18V oy I 100pf ~ * SOLID TANTALUM Negative Peak Detector +15V rr J J OUTPUT 10k 3 20k 2) cr 8 INPUT: at T+ = dh ~1v * SOLID TANTALUM re LT Wee 6-91

LT111A/LT311A , LM111/LM311 SCHEMATIC DIAGRAM Ls] [*] an 7 US :

4 J L = P *”

re ere | v0 [ =F) LJ PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. H Package J8 Package N8 Package Metal Can 8 Lead Hermetic Dip 8 Lead Plastic ee L = ae 6-92 LT EAR