LTC1051 LINER | Alldatasheet
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f D At) f / \\2 " LTCIOSVLTC1053 FECHNOLOGY —_ Dual/Quad Precision Chopper Stabilized Operational Amplifiers With Internal Capacitors FEATURES DESCRIPTION ® Dual/Quad Low Cost Precision Op Amp The LTC1051/LTC1053 is a high performance, low cost = No External Components Required dualiquad chopper stabilized operational amplifier. The = Maximum Offset Voltage 5:V unique achievement of the LTC1051/LTC1053 is that it inte- = Maximum Offset Voltage Drift 0.05,V/°C grates on chip the sample-and-hold capacitors usually re- ™ Low Noise 1.5pVp. (0.1Hz to 10Hz) quired externally by other chopper amplifiers. Further, the = Minimum Voltage Gain, 120dB LTC1051/LTC1053 offers better combined overall DC and = Minimum PSRR, 120dB AC performance than is available from other chopper sta- = Minimum CMRR, 114dB bilized amplifiers with or without internal samplelhold = Low Supply Current 1mA/Op Amp capacitors = Single Supply Operation 4.75V to 16V th i e LTC1051/LTC 1053 has an offset voltage of 0.5,V, drift eat amon Mode Range Includes Ground of 0.01,VI9C, DC to 10H, input noise voltage typically aT P 9 u . 1.5:Vp.p and typical voltage gain of 140dB. The slew rate of ypical Overload Recovery Time 3ms : . r = Pin Compatible with Industry Standard Dual and Quad 4VIus and gain bandwidth product of 2.5MHz are achieved Op Amps vy u with only 1mA of supply current per op amp. Overload recovery times from positive and negative saturation conditions are 1.5ms and 3ms respectively, APPLICATIONS about a 100 or more times improvement over chopper am- ae plifiers using external capacitors. = Thermocouple Amplifiers . . . | . ® Electronic Scales The LTC1051 is available in standard plastic and ceramic = Medical Instrumentation dual in line packages as well as a 16-pin SOL package. The ™ Strain Gauge Amplifiers LTC1083 is available in a standard 14-pin plastic package ® High Resolution Data Acquisition and an 18-pin SOIC. The LTC1051/LTC1053 is a plug in re- = DC Accurate R, C Active Filters placement for most standard dual/quad op amps with im- , proved performance. oO TYPICAL APPLICATION High Performance Low Cost Instrumentation Amplifier LTC1051 Noise Spectrum 120 AL re : goo AMT : | SU TT i Rt = 8 = 2 IT ill vet => > oe SN ren OF ECCT R2= 100k. 0.1% -iV 5 oe * CUUTTE TTT TT MEASURED CMAR ~ 120dB AT DC MEASURED INPUT Vos 3nV 20 hi MEASURED INPUT NOISE 2uVp-p (DC — 10Hz) 10 100 1k 10k FREQUENCY (Hz) en 9-306 LIT UNG
. LTC1051/LTC1053 eed ABSOLUTE MAXIMUM RATINGS Ee! PACKAGE/ORDER INFORMATION ORDER ror wew ORDER ror view PART NUMBER off 7 bgono PART NUMBER wy B v LTC1051MJ8 saat Ene LTC1053CN ca -_ LTC105168 va 5. oad l-ne LTC1051CN8 a nc eee ice LTC1051AMJ8 owns Blase LTC1051ACU8 NPAOUGE LTC1051ACN8 waporastene oven UTC1051C8 «fe LTC1053CS “a Bx LTC1051ACS oo Ea ono -a TY [is] -'No cura CY oe wa [is] +N -waEy] Fa} oure “ ™ owt Fane sn ae -@ fl +me ite Fy inc wd pan: oure [8] [iy] ourc ny [sync nc fig} no SPACE > LEAD PLASTIC SOL wee SY ELECTRICAL CHARACTERISTICS Vs = + 5V, Ta = operating temperature range unless otherwise specified. ro | | a PARAMETER CONDITIONS MIN TYP MAX | MIN TYP MAX UNITS Input Offset Vatage [meme TTS] |W Average Input Offset Drift po fof 00 2005 | 002005 | avec Long Term Offset Drift po Tito LTCI051C/LTC1053C £136 £100 pA UTC1051M £450 £300 pA ereimenmeeny [eee se | £175 +150 pA Rs = 1000, DC to 1Hz 04 04 Vp input Nese Curent SOS Od commenemmnont ferremme | [gw |g 100 110 dB LTC1051, LTC1053 (Note 2) Power Supply Rejection Ratio | Vs=x2976Vioxev fe] 6 oto Large Signal Voltage Gain [| R=10K0,Vor=24v fe] m6 60 | tt seroowes [ecg ase R= 100k0 $45 £4.95 £495 v Slew Rate [R=toKa.G=s0pF Ps SS LY Lng 2-307
LTC1051/LTC1053 ‘ LS ELECTRICAL CHARACTERISTICS Vg = + 5V, Ty = operating temperature range unless otherwise specified. LTC1051AILTC1051/LTC1053 PARAMETER MIN TP MAX UNITS Gain Bandwidth Product Lo cove a m ifernal Samping Frequency a Vs = 5V, GND, T, = operating temperature range unless otherwise specified. LTC1O51A/LTC1054/LTC1053 PARAMETER CONDITIONS MIN TYP MAX UNITS Input Offset Voltage Pomeseo nV input Ot Dit C00 2005 |r input Bias Curent oS pA Input Offset Current a a Y pA InputNoiseVotage [ecto Sd Supply CuenOp Amp [-Woteed.T,=26°0 ite] ——SSCSCS~S'~SdT Sm The © denotes the specifications which apply over the full operating Note 2: Differential CMRR for the LTC1053 is measured between amplifiers temperature range. Aand D, and amplifiers B and C. Note 1: For guaranteed noise specification contact LTC marketing. ES TEST CIRCUITS Electrical Characteristics Test Circuit DC-10Hz Noise Test Circuit 1M 475k 100k + ‘wettest coureut ke inten rs nn Bee sprue roxy 4 RL ¥ One O.taE RECORDER " + Id FOR 1Hz NOISE BW WROREASE A. THE capaciTons BYA racron OF 10. RS TYPICAL PERFORMANCE CHARACTERISTICS Common Mode Input Range vs Sampling Frequency vs Supply Sampling Frequency vs Supply Voltage Voltage Temperature 8 4 A CEE) , EEEEEFA etl Tt Perl 2, Z etter i ek i. Pir ll 3 | | pee 2 ‘ONDE eCity g, aot 2 Cl Serr z= fii ti tity é a a g- ea | 2 | /| gj, [TU | | tty a [ {Set gs Scorer
8 SI z = _
oft TT EAA # Mae 2 a .oLLTTTT EN, a O #1 £2 £3 24 +5 26 +7 28 4 6 8 10 12 4 16 - -3 0 B 5 7 100 125 ‘SUPPLY VOLTAGE (V) TOTAL SUPPLY VOLTAGE, V+ TOV~ (V) AMBIENT TEMPERATURE, Ta (°C) Ed 2-308 OD White
LTC! S Wie z 8 esis yz ISTIC sinPhas a zk €R G ml cot TH {Ni ae ACT ture ts at we aera, : Peet =! tv 25 E) LTT IN, be il 0 — nae Sire AF ge F seeeee § “Tih ch ci " PE WyVota 2 Sore g* Hil rane ‘ PIC ents “| Se al am - TY Curr Borris "Oo cy | 0 mea 7 euPS — ’ en aoa > 3 5 thee =! - =z : eecae f EEEEE “ qh " 125 ° ENT TEMPERA i) HE i f NI fee HEE can rm * ELEET 2 : enc ly % i Mu, mi wi Mil -200 : ieee re at i° || tee, 0 qe 3° Hh ia — an | 8 ode nts "TT it imi aii Ul 3 Hie iat ok beaut ture “TH at HIN Ni aul vat re nn oie ic] {aA Hi ai as me i spor So ea . Ht | hos -o lll sent Res Paaehe 4 =" ve WT Hil ih {Trans : Supp rl g “Ty ul mill aN a aoe = ll si TOE - , cate meu ° pA fae B aa | ani FREQUENCY onse oe 4 pr 3 0 . — 16 . al Tar | - i” Sanu F 5 10 pose = 1 im INPUTeV ae | eat 5- is + —t a iL a+ Ae id Eoeee ce = 1009 ms £ i : : _ IneuT 1oonv 50 | sym e 2-30 [ ar eee, nea ; = I = vere Oo
LTC1051/LTC1053 . ee TYPICAL PERFORMANCE CHARACTERISTICS LTC1051/LTC1053 DC to 10Hz Noise Ta=s°e IM hb \\ UAL y hl 10SEC Le ssec-o| ——— SSS APPLICATIONS INFORMATION ACHIEVING PICOAMPERE/MICROVOLT PERFORMANCE Picoamperes Any connection of dissimilar metals forms a thermoelec- In order to realize the picoampere level of accuracy of the —_tric junction producing an electric potential which varies LTC1051/LTC 1053, proper care must be exercised. Leakage with temperature (Seebeck effect). As temperature Currents in circuitry external to the amplifier can signif; sensors, thermocouples exploit this phenomenon to pro- icantly degrade performance. High quality insulation duce useful information. In low drift amplifier circuits the should be used (e.g., Teflon, Kel-F); cleaning of all insulat- _ effect is a primary source of error. ing surfaces to remove fluxe S and other residues will Connectors, switches, relay contacts, sockets, resistors, probably be necessary — particularly for high temperature . . . solder, and even copper wire are all candidates for thermal performance. Surface coating may be necessary to pro- , | : vide a moisture barrier in high humidity environments EMF generation. Junctions of copper wire from different . Manufacturers can generate thermal EMFs of 200nV/°C — Board leakage can be minimized by encircling the input 4 times the maximum drift specification of the LTC1051/ connections with a guard ring operated at a potential LTC1053. The copper/kovar junction, formed when wire or close to that of the inputs: in inverting configurations the _ printed circuit traces contact a package lead, has a ther- guard ring should be tied to ground; in non-inverting con- — mal EMF of approximately 35,:V/°C — 700 times the maxi- nections to the inverting input. Guarding both sides of the mum drift specification of the LTC1051/LTC1053, aeends, on mega ving ich Bulk leakage reduction Minimizing thermal EMF-induced errors is possible if , judicious attention is given to circuit board layout and Microvolts component selection. It is good practice to minimize the number of juctions in the amplifier’s input signal path. Thermocouple effects must be considered if the LTC1051/ Avoid connectors, sockets, switches and relays where LTC1053's ultra low drift op amps are to be fully utilized. possible. In instances where this is not possible, attempt SS 2-310 Oy wire
to balance the number and type of junctions so that dif- sampling and holding of the op amps input offset voltage. liberately introducing junctions to offset unavoidable to 15pA with sign convention shown in Figure 1. the thermal EMF errors of these components. of both inputs assumes the same sign. are at the same temperature, their thermal EMFs will can- . and vary with resistor value. High values give higher ther- . Table 1. Resistor Thermal EMF when the closed loop gain exceeds 10V/V, Figure 2. The
- The number of alias signals increases when the input LTC1051/LTC1053 op amps under light loads (RL > 10k) signal frequency increases, Figure 5B. swing closely to the supply rails without generating 4, When the frequency, fin, of the input signal is less than harmonic distortion, Figure 6. fotock, the alias signal(s) amplitude(s) directly scale’ 5. For unity gain inverting configuration, all the alias fre- with the amplitude of the incoming signal. The output quencies are 80dB to 84dB down from the output “signal to alias ratio” cannot be increased by just signal, Figures 6A, 6B. Combined with excellent THD boosting the input signal amplitude. However, when the under wide swing, the LTC1051/LTC1053 op amps make input AC signal frequency well exceeds the clock fre- efficient unity gain inverters. quency, the amplitude of the alias signals does not aoe let toy mat directly scale with the input amplitude. The ‘signal to For gain higher than ~ vie Cf signal teats 4 enn ee alias ratio” increases when the output swings closely ‘leas at an i Poute 8 @ rate oF — Gdb per decade o! -_.. tothe rails, Figures 5B, 7. Itis important to note that the Closed loop gain Figure &. Ea i RANGE! 9 dR Status: PAUSED 20 BtnaG RMS1 25. : aby R= 10k | | | O08
8 Ri=tk
aw , oe oe © Si > to 50pF = OF Figure 5A. Output Voltage Spectrum of 1/2 LTC1051 Operating as an Inverting Amplifier with Gain of 10, and Amplifying a 750Hz, 800mV Input AC Signal. asnas RANGE! 13 aRV ‘sraruse PAUSED ae : : . . I Li . Meee Neen arama 100 SENTERS Fy 908 Kr ye tbs OE 985 Hz SPAN: 18 @0@ Hz Figure 5B. Same as Figure 5A, but the AC Input Signal is 900mV, 10kHz SS LT Wnene 2-313
LTC1051/LTC1053 , a APPLICATIONS INFORMATION 6. For closed loop gains of - 10 or higher, the “signal to apply with the following exceptions: When the closed alias” ratio degrades when the value of the feedback loop gain is + 10(V/V) and below, the “signal to alias” gain setting resistor increases beyond 50kQ. For in- ratio is 1dB to 3dB less than the inverting case. When stance, the 68dB value of Figure 7, decreases to 56dB if the closed loop gain is 100(V/V) the degradation can be a (1kQ, 100k0) resistor set will be used to set the gain up to 9dB, especially when the input signal is much of - 100. higher than the clock frequency (i.e. fy = 10kHz). 7. When the LTC1051/LTC1053 are used as non-inverting 8. The signal/alias ratio performance improves when the op amplifiers all the previous approximate rules of thumb amp has bandlimited loop gain. RANGES 9 ABY STATURE PAUSED Binas RNSt ae 10K 7 my fenctinnnin ses as o . 10k . Ay [ 2) riakrcvost
7 RENE I SaaS ‘ a ae 80pF
NOTE: THE fou ~ f= 85H2 t tt " 8 ALIAS FREQUENCY IS 9508 Boum fin A Sou & f= 2685KHE (DOWN FROM THE OUTPUT LEVEL Figure 6A. Output Voltage Spectrum of 1/2LTC1051 Operating as a Unity Gain Inverting Amplifier. Vg = +5V, RL = 10k, C, = 50pF, Vin =8Vp-p, 2.685kHz. ALL ALIAS FREQUENCY 8008 10 84d8 DOWN FROM OUTPUT RANGE! 9 qBYy STATUS. POSED B binag 3 anst 38 4 10888 y t YI 7,98 aBV ' | be sont | bh. talon tet m Stanly Figure 6B. Output Voltage Spectrum of 1/2 LTC1051, Operating as a Unity Gain Inverting Amplifier. Vg = + 5V, RL = 10k, C, = 50pF, Vin = 8Vp-p, 10kHz. TT 2-314 Othe
13 Ri=1000 -
Figure 7. Output Voltage Spectrum of 1/2 LTC 1051 Operating as an Inverting Amplifier with a Gain of - 100 and Amplitying a 90mVp-p, 10kHz Input Signal. With a 9Vp-p Output Swing the Measured 2nd Harmonic (20kHz) was 75 Down from the 10kHz Input Signal.
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Figure 8. Output Voltage Swing vs Load Figure 9. Signal to Alias Ratio vs Closed Loop Gain
LTC1051/LTC1053 ‘ ood APPLICATION CIRCUITS Obtaining Ultra-Low Vos Drift and Low Noise The dual chopper op amp buffers the inputs of A, and cor- iS rects its offset voltage and offset voltage drift. With the shown tos RC values, the power up warm up time is typically 20s. The ' se step response of the composite amplifier does not present ! ae settling tails. The LT1007 should be used when extremely low ‘6 ys, Noise, Vog and Vos drift are sought when the input source + Sy . resistance is low. (For instance a 3500 strain gauge bridge.) H INO, The LT1012 or equivalent should be used when low bias cur- ' rs tent (100pA) is also required in conjunction with DC to 10Hz H fetes F se low noise, and low Vog and Vos drift. The measured typical t - “ We o arn input offset voltages were less than 2uV. 1 ® ae ' . 1 - toe e [oat Toma [re Tors Tome sch Tc? Ry (OC- 1H)" | Baur (OC-10H)" | trios | 7500 570 | 250k 100k | _O.0tWF 0.001aF 0.34Vp-p O.4uVp-p “Interchange connections(A and ®. . **Noise measured in a 10 sec. window. Peak-to-peak noise was also measured for 10 continuous minutes: With the LT1007 op amp the recorded noise was 0.2,Vp-p for both DC-1Hz and DC-10Hz. LTC1051/LT1007 Peak-to-Peak Noise LET el AL _ [Nose | DCTO10Hz | ry An Arana Un, PA pe maew™, When ie TSECIDIV a 2-316 Oy wiete
a APPLICATION CIRCUITS Paralleling Choppers to improve Noise RY > NOTE: THIS CIRCUIT CAN ALSO BE USED AS A R DIFFERENCE AMPLIFIER FOR STRAIN GAUGES. CONNECT R2/3 AND R1/3 FROM NON-INVERTING INPUTS, SHORTED TOGETHER, TO GROUND AND TO SOURCE RESPECTIVELY. R +5V vi ‘iN Li | nN an uF
14 Vout 2 |
= sy ARO uF fe Wa > aq of es y Vou R2 NOISE OF EACH PARALLELED OP AMP a Te Sq PUT OG - 10H NOISE =O ,Vpip = EE Differential Voltage to Current Converter O.1nF vt 3 2 20k Vv 10k 10k Re 20k 9 4 TT ue pe = S: > 20k ey ve 2 10K “V py Aue = 10k “10% olygt= anv or ‘n| [| roa BW = 100Hz = = Igy MAX. = tmA, SS LY \\nene 2-317
Multiplexed Differential Thermometer 1002 255k 0.068 ,F eK gf ttoi08s © ABSOLUTE TEMPERATURE = Oe ne a © ABSOLUTE TEMPERATURE 4000 255k 10k 0.068 uF als 2 i) ee GL S San «dren s} os 10k 19} Hs output IFFERENTIAL is nal " SBPERATURE) L710254 = 10k = 1000 255k GND__R- 0.068 uF = 3S = th >? Trer TYPEK 10] ane a 0.1 uF ‘ALL FIXED RESISTORS ARE 1% METAL FILM Tr OUTPUT = Treg - T1 OR Tage - T2 (10mV PER °C) = ACCURACY = (20.1% FROM 25°C TO 150°C) Six Decade Log Amplifier ai a 0.0022uF zope NY Mal 84 ; Tie 6 |2.5M, 0.1%] vy 10k, 0.1%| 2 fs SRA Cite eee vw p> 158k, 0.1% pee Lr1009 So fe De TnA<liy<tma f ETEI051 a ty 1k = = iy 0.1% Our TS BV ° Vout= LOG Viy-2V = = Qt: TEL LAB TYPE 081 ADJUST 2M POR, FOR NON-LINEARITIES a
Dual Instrumentation Amplifier Coie 4 ssv + s S re] 3 ha i 8 yeticist>-p— Vou fi i Dy 1 ! INPUT 1 tak H tak { y I @ 1 2 1 | 1k oa GAIN=10101V _h 3 + = an tr ot) Lo H 1 ius) Youre 1 \\ Sn
1 Wy y
INPUT | wed Mak 1 I 1 1 i ' kone > = G, ‘CMR > 10048 Vos=3KV + INPUT REFERRED NOISE=2,. Vp-p O07 Linearized Platinum Signal Conditioner 250k" (LINEARITY CORRECTION LOOP} > 24k Lecead> A cn [> 50k 2 = ZERO Aouust 825k" Oar = = 2k ---- -ty}- r 4 Canoe 7 W2LTC1043 5 ov-4v =0°C-400°C ge of] [sto o—{s} Eo £0.05°C J 1 1 htisaa ' 1 ' 4 ! fy 5k
1 Wy 1 oI
i = | we Veara 1 wt ue S000 = ' ! 18 ! 1 I ! 1 ' 1 i ro ° fis} fi5] ) o fig} = ah | Rp = = --- Kk] & 1000 L- ave —— Rp= ROSEMOUNT 118MERTD = oo “1% FILM RESISTOR ‘TRIM SEQUENCE: ‘SET SENSOR TO 0°C VALUE. ADJUST ZERO FOR QV OUT. SET SENSOR TO 100°C VALUE ADJUST GAIN FOR 1,000V OUT. SET SENSOR TO 400°C VALUE. ADJUST LINEARITY FOR 4 000V OUT. REPEAT AS REQUIRED. FOR MORE INFORMATION REFER TO ANA, Sana
LTC1051 /LTC1053 . TS APPLICATION CIRCUITS DC Accurate, 3rd Order, 100Hz, Butterworth Antialiasing Filter Dynamic Range ai ON pS 608 gy OME See & als q a ee 2 = 3 sa Vin = B a eee! ee ooo LLL ETT FT sas WIDEBAND NOISE 9,Vems Ot 1 5 THD + NOISE =0.0012%, 1Vams<Vin<2VeMs, Vs= +8V ‘Vin (Vans), fin = 30HZ Vos (OUT) <5, OC Accurate, 18-Bit 4th Order Antialiasing Bessel (Linear Phase), 100Hz, Lowpass Filter R2A 10k R2B CIA 50k owt ce 10k 26.7 Vin RIB RIB ‘50k 412k > cB vie 0.022pF T $i WIDEBAND RMS NOISE 4.52Veus, = = THD + NOISE =0,0005% ( = 10608 DYN. RANGE), 2Vams<Vin<3Vams Vos OUT<10u¥ Dynamic Range 0 eS oe a oor fet TT
20 SSeS SH
2 FSS ro
_—— Sao anion ooo LE TEE TTT nas 01 1 5 Vin (VaMs), fin = 30H2 a 2-320 LC Wnthe