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  1 ltc2050/LTC2050HV 2050fa applicatio s u descriptio u features typical applicatio n u zero-drift operational amplifiers in sot-23 n thermocouple amplifiers n electronic scales n medical instrumentation n strain gauge amplifiers n high resolution data acquisition n dc accurate rc active filters n low side current sense n maximum offset voltage of 3 m v n maximum offset voltage drift of 30nv/ c n noise: 1.5 m v p-p (0.01hz to 10hz typ) n voltage gain: 140db (typ) n psrr: 130db (typ) n cmrr: 130db (typ) n supply current: 0.8ma (typ) n supply operation: 2.7v to 6v (ltc2050) 2.7v to 5.5v (LTC2050HV) n extended common mode input range n output swings rail-to-rail n input overload recovery time: 2ms (typ) n operating temperature range: C 40 c to 125 c n sot-23 package the ltc ? 2050 and LTC2050HV are zero-drift operational amplifiers available in the 5- or 6-lead sot-23 and so-8 packages. the ltc2050 operates from a single 2.7v to 6v supply. the LTC2050HV operates on supplies from 2.7v to 5.5v. the current consumption is 800 m a and the versions in the 6-lead sot-23 and so-8 packages offer power shutdown (active low). the ltc2050, despite its miniature size, features uncom- promising dc performance. the typical input offset volt- age and offset drift are 0.5 m v and 10nv/ c. the almost zero dc offset and drift are supported with a power supply rejection ratio (psrr) and common mode rejection ratio (cmrr) of more than 130db. the input common mode voltage ranges from the negative supply up to typically 1v from the positive supply. the ltc2050 also has an enhanced output stage capable of driving loads as low as 2k w to both supply rails. the open- loop gain is typically 140db. the ltc2050 also features a 1.5 m v p-p dc to 10hz noise and a 3mhz gain bandwidth product. input referred noise 0.1hz to 10hz differential bridge amplifier , ltc and lt are registered trademarks of linear technology corporation. + 5v 0.1 f 18.2k 0.1 f 18.2k 5 1 2 3 4 0.1 m f 5v a v = 100 2050 ta01 350 w strain gauge 50 w gain trim LTC2050HV ?v 2 1 0 ? ? v 24 0 6 8 10 time (sec)
2 ltc2050/LTC2050HV 2050fa wu u package / o rder i for atio a u g w a w u w a r b s o lu t exi t i s order part number total supply voltage (v + to v C ) ltc2050 .............................................................. 7v LTC2050HV ......................................................... 12v input voltage ........................ (v + + 0.3v) to (v C C 0.3v) output short-circuit duration ......................... indefinite ltc2050cs5 ltc2050is5 ltc2050hs5 LTC2050HVcs5 LTC2050HVis5 LTC2050HVhs5 t jmax = 125 c, q ja = 190 cw s5 part marking ltaeg ltaeg ltaeg ltaeh ltaeh ltaeh operating temperature range ............. C 40 c to 125 c specified temperature range (note 3) ............................................... C 40 c to 125 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c 1 2 3 4 8 7 6 5 top view nc v + out nc shdn ?n +in v s8 package 8-lead plastic so order part number ltc2050cs6 ltc2050is6 ltc2050hs6 LTC2050HVcs6 LTC2050HVis6 LTC2050HVhs6 s6 part marking order part number ltc2050cs8 ltc2050is8 LTC2050HVcs8 LTC2050HVis8 s8 part marking 2050 2050i 2050hv 050hvi out 1 v 2 top view s5 package 5-lead plastic sot-23 +in 3 5 v + 4 in t jmax = 125 c, q ja = 230 cw t jmax = 125 c, q ja = 250 cw out 1 v 2 +in 3 6 v + 5 shdn 4 in top view s6 package 6-lead plastic sot-23 (note 1) (ltc2050, LTC2050HV) the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 3v unless otherwise noted. (note 3) e lectr ic al c c hara terist ics ltc2050c/ltc2050i ltc2050h parameter conditions min typ max min typ max units input offset voltage (note 2) 0.5 3 0.5 3 m v average input offset drift (note 2) l 0.03 0.05 m v/ c long-term offset drift 50 50 nv/ ? mo input bias current ltc2050 20 75 20 75 pa l 300 4000 pa LTC2050HV 1 50 1 50 pa l 100 4000 pa input offset current ltc2050 150 150 pa l 200 1000 pa LTC2050HV 100 100 pa l 150 1000 pa input noise voltage r s = 100 w , 0.01hz to 10hz 1.5 1.5 m v p-p common mode rejection ratio v cm = gnd to (v + C 1.3) 115 130 115 130 db v cm = gnd to (v + C 1.3) l 110 130 110 130 db consult ltc marketing for parts specified with wider operating temperature ranges. ltaej ltaej ltaej ltaek ltaek ltaek
3 ltc2050/LTC2050HV 2050fa ltc2050c/ltc2050i ltc2050h parameter conditions min typ max min typ max units power supply rejection ratio v s = 2.7v to 6v 120 130 120 130 db l 115 130 115 130 db large-signal voltage gain r l = 10k 120 140 120 140 db l 115 140 115 140 db output voltage swing high r l = 2k to gnd l 2.85 2.94 2.85 2.94 v r l = 10k to gnd l 2.95 2.98 2.95 2.98 v output voltage swing low r l = 2k to gnd l 110 110 mv r l = 10k to gnd l 110 110 mv slew rate 22v/ m s gain bandwidth product 3 3 mhz supply current v shdn = v ih , no load l 0.75 1.1 0.75 1.2 ma v shdn = v il l 10 10 m a shutdown pin input low voltage (v il ) l v C + 0.5 v C + 0.5 v shutdown pin input high voltage (v ih ) l v + C 0.5 v + C 0.5 v shutdown pin input current v shdn = gnd l C 0.5 C 3 C 0.5 C 3 m a internal sampling frequency 7.5 7.5 khz (ltc2050, LTC2050HV) the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 3v unless otherwise noted. (note 3) e lectr ic al c c hara terist ics ltc2050c/ltc2050i ltc2050h parameter conditions min typ max min typ max units input offset voltage (note 2) 0.5 3 0.5 3 m v average input offset drift (note 2) l 0.03 0.05 m v/ c long-term offset drift 50 50 nv/ ? mo input bias current ltc2050 75 150 75 150 pa l 300 4000 pa LTC2050HV 7 50 7 50 pa l 150 4000 pa input offset current ltc2050 300 300 pa l 400 1000 pa LTC2050HV 100 100 pa l 200 1000 pa input noise voltage r s = 100 w , 0.01hz to 10hz 1.5 1.5 m v p-p common mode rejection ratio v cm = gnd to (v + C 1.3) 120 130 120 130 db v cm = gnd to (v + C 1.3) l 115 130 110 130 db power supply rejection ratio v s = 2.7v to 6v 120 130 120 130 db l 115 130 115 130 db large-signal voltage gain r l = 10k 125 140 125 140 db l 120 140 115 140 db output voltage swing high r l = 2k to gnd l 4.85 4.94 4.85 4.94 v r l = 10k to gnd l 4.95 4.98 4.95 4.98 v output voltage swing low r l = 2k to gnd l 110 110 mv r l = 10k to gnd l 110 110 mv slew rate 22v/ m s gain bandwidth product 3 3 mhz supply current v shdn = v ih , no load l 0.8 1.2 0.8 1.3 ma v shdn = v il l 15 15 m a the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. (ltc2050, LTC2050HV) v s = 5v unless otherwise noted. (note 3)
4 ltc2050/LTC2050HV 2050fa note 1: absolute maximum ratings are those values beyond which the life of the device may be impaired. note 2: these parameters are guaranteed by design. thermocouple effects preclude measurements of these voltage levels during automated testing. note 3: all versions of the ltc2050 are designed, characterized and expected to meet the extended temperature limits of C 40 c and 125 c. the ltc2050c/LTC2050HVc are guaranteed to meet the temperature limits of 0 c and 70 c. the ltc2050i/LTC2050HVi are guaranteed to meet the temperature limits of C40 c and 85 c. the ltc2050h/LTC2050HVh are guaranteed to meet the temperature limits of C40 c and 125 c. (LTC2050HV) the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 5v unless otherwise noted. (note 3) e lectr ic al c c hara terist ics ltc2050c/ltc2050i ltc2050h parameter conditions min typ max min typ max units input offset voltage (note 2) 0.5 3 0.5 3 m v average input offset drift (note 2) l 0.03 0.05 m v/ c long-term offset drift 50 50 nv/ ? mo input bias current (note 4) 25 125 25 125 pa l 300 4000 pa input offset current (note 4) 250 250 pa l 500 1000 pa input noise voltage r s = 100 w , 0.01hz to 10hz 1.5 1.5 m v p-p common mode rejection ratio v cm = v C to (v + C 1.3) 120 130 120 130 db v cm = v C to (v + C 1.3) l 115 130 115 130 db power supply rejection ratio v s = 2.7v to 11v 120 130 120 130 db l 115 130 115 130 db large-signal voltage gain r l = 10k 125 140 125 140 db l 120 140 120 140 db maximum output voltage swing r l = 2k to gnd l 4.75 4.94 4.50 4.94 v r l = 10k to gnd l 4.90 4.98 4.85 4.98 v slew rate 22v/ m s gain bandwidth product 3 3 mhz supply current v shdn = v ih , no load l 1 1.5 1 1.6 ma v shdn = v il l 25 25 m a shutdown pin input low voltage (v il ) l v C + 0.5 v C + 0.5 v shutdown pin input high voltage (v ih ) l v + C 0.5 v + C 0.5 v shutdown pin input current v shdn = v C l C3 C20 C3 C20 m a internal sampling frequency 7.5 7.5 khz note 4: the bias current measurement accuracy depends on the proximity of the supply bypass capacitor to the device under test, especially at 5v supplies. because of testing limitations on the placement of this bypass capacitor, the bias current at 5v supplies is guaranteed by design to meet the data sheet limits, but tested to relaxed limits. ltc2050c/ltc2050i ltc2050h parameter conditions min typ max min typ max units shutdown pin input low voltage (v il ) l v C + 0.5 v C + 0.5 v shutdown pin input high voltage (v ih ) l v + C 0.5 v + C 0.5 v shutdown pin input current v shdn = gnd l C 0.5 C 7 C 0.5 C 7 m a internal sampling frequency 7.5 7.5 khz the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. (ltc2050, LTC2050HV) v s = 5v unless otherwise noted. (note 3)
5 ltc2050/LTC2050HV 2050fa gain/phase vs frequency bias current vs temperature output swing vs output current cc hara terist ics uw a t y p i ca lper f o r c e common mode rejection ratio vs frequency dc cmrr vs common mode input voltage output voltage swing vs load resistance frequency (hz) 20 cmrr (db) 40 80 120 140 1 100 1k 100k 2050 g01 0 10 10k 60 100 v s = 3v or 5v v cm = 0.5v p-p v cm (v) 20 cmrr (db) 40 80 120 140 134 0 2050 g02 0 25 60 100 v s = 3v v s = 5v t a = 25 c load resistance (k w ) 0 output swing (v) 6 5 4 3 2 1 0 2 4 2050 g03 6 8 10 r l to gnd v s = 5v v s = 3v output current (ma) 0.01 2 output voltage (v) 3 4 5 0.1 1 10 2050 g04 1 0 6 v s = 5v v s = 3v frequency (hz) 0 gain (db) 20 40 60 100 100 1k 100k 1m 10m 2050 g05 ?0 ?0 10k 80 180 phase (deg) 160 140 120 100 200 80 gain phase v s = 3v or 5v c l = 35pf r l = 10k temperature ( c) ?5 10 1 100 10k 1k 100 75 2050 g06 ?0 125 bias current (pa) 50 025 v s = 3v v s = 5v frequency (hz) 10 psrr (db) 120 100 80 60 40 20 0 100 1k 10k 100k ltc2050 ?g14 1m ?srr +psrr psrr vs frequency load resistance (k ) 0 output swing (v) 5 4 3 2 1 0 ? ? ? ? ? 8 2050 g16 2 4 6 10 r l to gnd output current (ma) 0.01 output swing (v) 5 4 3 2 1 0 ? ? ? ? ? 2050 g17 0.1 10 1.0 r l to gnd output swing vs output current 5v supply output swing vs load resistance 5v supply
6 ltc2050/LTC2050HV 2050fa temperature ( c) ?0 sampling frequency (khz) 10 9 8 7 6 5 0 50 75 2050 g10 ?5 25 100 125 v s = 5v sampling frequency vs temperature supply current vs supply voltage supply current vs temperature cc hara terist ics uw a t y p i ca lper f o r c e temperature ( c) ?0 supply current (ma) 1.0 0.8 0.6 0.4 0.2 0 0 50 75 2050 g12 ?5 25 100 125 v s = 3v v s = 5v sampling frequency vs supply voltage supply voltage (v) 2.5 5 sampling frequency (khz) 6 7 3.5 3.0 4.5 4.0 5.0 5.5 2050 g09 8 9 10 6.0 t a = 25 c 1.5 0 C0.2 input (v) 500 m s/div output (v) 0 2050 g08 a v = C100 r l = 100k c l = 10pf v s = 1.5v input overload recovery input common mode voltage (v) 0 input bias current magnitude (pa) 3 5 2050 g13 12 4 160 140 120 100 80 60 40 20 0 v s = 5v v s = 3v input bias current vs input common mode voltage 0.5v/div 1 m s/div transient response a v = 1 r l = 100k c l = 50pf v s = 5v 2050 g07 input bias current vs input common mode voltage (LTC2050HV) input common mode voltage (v) input bias current (pa) 60 50 40 30 20 10 0 ?0 2050 g15 ? ? ? 1 3 5 v s = 5v v s = 5v v s = 3v supply voltage (v) supply current (ma) 24 6 8 10 1.2 1.0 0.8 0.6 0.4 0.2 0 2050 g11 t a = 25 c
7 ltc2050/LTC2050HV 2050fa the op amp. this form of clock feedthrough is independent of the magnitude of the input source resistance or the magnitude of the gain setting resistors. the ltc2050 has a residue clock feedthrough of less then 1 m v rms input referred at 7.5khz. the second form of clock feedthrough is caused by the small amount of charge injection occurring during the sampling and holding of the op amps input offset voltage. the current spikes are multiplied by the impedance seen at the input terminals of the op amp, appearing at the output multiplied by the closed loop gain of the op amp. to reduce this form of clock feedthrough, use smaller valued gain setting resistors and minimize the source resistance at the input. if the resistance seen at the inputs is less than 10k, this form of clock feedthrough is less than 1 m v rms input referred at 7.5khz, or less than the amount of residue clock feedthrough from the first form described above. placing a capacitor across the feedback resistor reduces either form of clock feedthrough by limiting the bandwidth of the closed loop gain. applicatio n s i n for m atio n wu u u shutdown the ltc2050 includes a shutdown pin in the 6-lead sot-23 and the so-8 version. when this active low pin is high or allowed to float, the device operates normally. when the shutdown pin is pulled low, the device enters shutdown mode; supply current drops to 3 m a, all clocking stops, and both inputs and output assume a high imped- ance state. clock feedthrough, input bias current the ltc2050 uses auto-zeroing circuitry to achieve an almost zero dc offset over temperature, common mode voltage, and power supply voltage. the frequency of the clock used for auto-zeroing is typically 7.5khz. the term clock feedthrough is broadly used to indicate visibility of this clock frequency in the op amp output spectrum. there are typically two types of clock feedthrough in auto zeroed op amps like the ltc2050. the first form of clock feedthrough is caused by the settling of the internal sampling capacitor and is input referred; that is, it is multiplied by the closed loop gain of test circuits + ltc2050 v + v 10 1 2 3 4 5 r l 2050 tc01 100k output + ltc2050 + lt1012 10 1 3 4 2050 tc02 100k 475k 475k 316k 158k 0.1 f 0.01 f 0.01 f to x-y recorder for 1hz noise bw increase all the capacitors by a factor of 10. electrical characteristics test circuit dc-10hz noise test circuit
8 ltc2050/LTC2050HV 2050fa typical applicatio n s u single supply thermocouple amplifier gain of 1001 single supply instrumentation amplifier 2050 ta04 + + 10k 10 10 10k v + v + 4 5 1 2 3 4 5 1 2 3 v out ? in +v in ltc2050 ltc2050 output dc offset 6mv for 0.1% resistors, cmrr = 54db 0.1 f input bias current is defined as the dc current into the input pins of the op amp. the same current spikes that cause the second form of clock feedthrough described above, when averaged, dominate the dc input bias current of the op amp below 70 c. at temperatures above 70 c, the leakage of the esd protection diodes on the inputs increases the input bias currents of both inputs in the positive direction, while the current caused by the charge injection stays relatively constant. at elevated temperatures (above 85 c) the applicatio n s i n for m atio n wu u u leakage current begins to dominate and both the negative and positive pins input bias currents are in the positive direction (into the pins). input pins, esd sensitivity esd voltages above 700v on the input pins of the op amp will cause the input bias currents to increase (more dc current into the pins). at these voltages, it is possible to damage the device to a point where the input bias current exceeds the maximums specified in this data sheet. + + lt1025a gnd k r 5v 0.1 m f ltc2050 5 1 4 5 4 3 2 2 type k 7 v out 10mv/ c 1k 1% 255k 1% 100 0.068 f 2050 ta03 lt1025 compensates cold junction over 0 c to 100 c temperature range 5v
9 ltc2050/LTC2050HV 2050fa typical applicatio n s u + 1 3 4 5 sel1 10k 1.1k in 1 a v = 10 + 1 3 4 5 sel2 10k 10 in 2 a v = 1000 + 1 3 4 5 sel3 in 3 a v = 1 ltc2050 ltc2050 ltc2050 out select inputs are cmos logic compatible 2050 ta07 shdn shdn shdn high precision three-input mux instrumentation amplifier with 100v common mode input voltage + LTC2050HV + LTC2050HV 1m 1m 1 3 4 2050 ta06 1k 1m 1k 1k v out 5 2 1 3 4 5 2 v + v v + v output offset 3mv for 0.1% resistors, cmrr = 54db + v in low-side power supply current sensing + LTC2050HV 1 4 3 2050 ta08 5 2 5v ?v to measured circuit out 3v/amp load current in measured circuit, referred to ?v 10 10k 3m 0.1 f load current
10 ltc2050/LTC2050HV 2050fa package descriptio n u s5 package 5-lead plastic sot-23 (reference ltc dwg # 05-08-1633) s6 package 6-lead plastic sot-23 (reference ltc dwg # 05-08-1634) 1.50 ?1.75 (note 4) 2.60 ?3.00 0.25 ?0.50 typ 5 plcs note 3 datum ? 0.09 ?0.20 (note 3)
11 ltc2050/LTC2050HV 2050fa information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. package descriptio n u s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) .016 ?.050 (0.406 ?1.270) .010 ?.020 (0.254 ?0.508) 45 0 ?8 typ .008 ?.010 (0.203 ?0.254) so8 0303 .053 ?.069 (1.346 ?1.752) .014 ?.019 (0.355 ?0.483) typ .004 ?.010 (0.101 ?0.254) .050 (1.270) bsc 1 2 3 4 .150 ?.157 (3.810 ?3.988) note 3 8 7 6 5 .189 ?.197 (4.801 ?5.004) note 3 .228 ?.244 (5.791 ?6.197) .245 min .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note: 1. dimensions in 2. drawing not to scale 3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm)
12 ltc2050/LTC2050HV 2050fa ? linear technology corporation 1999 lt/tp 0503 1k rev a ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear.com related parts part number description comments ltc1049 low power zero-drift op amp low supply current 200 m a ltc1050 precision zero-drift op amp single supply operation 4.75v to 16v, noise tested and guaranteed ltc1051/ltc1053 precision zero-drift op amp dual/quad ltc1150 15v zero-drift op amp high voltage operation 18v ltc1152 rail-to-rail input and output zero-drift op amp single zero-drift op amp with rail-to-rail input and output and shutdown lt1677 low noise rail-to-rail input and ouptput v os = 90 m v, v s = 2.7v to 44v precision op amp lt1884/lt1885 rail-to-rail output precision op amp v os = 50 m v, i b = 400pa, v s = 2.7v to 40v ltc2051 dual zero-drift op amp dual version of the ltc2050 in ms8 package ground referred precision current sources + ltc2050 lt1034 + v out v + 10k 1 2 3 4 5 r set 0 i out 4ma 0.2v v out (v + ) ?1.5v + ltc2050 lt1034 + v out v 10k 1 2 3 4 5 r set 0 i out 4ma (v ) + 1.5v v out ?1v 2050 ta05 i out = r set 1.235v i out = r set 1.235v typical applicatio n s u


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