LT1102

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a ‘* » High Speed, Precision, JFET input Instrumentation Amplifier (Fixed Gain =10 or 100) FEATURES DESCRIPTION = Slew Rate 30V/us ~— The LT1102 is the first fast FET input instrumentation am- = Gain-Bandwidth Product 35MHz —plifier offered in the low cost, space saving 8pin w Settling Time (0.01%) 3ys packages. Fixed gains of 10 and 100 are provided with ex- = Overdrive Recovery 0.4us cellent gain accuracy (0.01%) and non-linearity (3ppm). No = Gain Error , 0.05% Max __ external gain setting resistor is required. i it 9, : Gain Nor-Uineety Gentes Slew rate, pecting time gain-bandwidth poet overt = Offset Voltage (Input + Output) 600,V Max recovery time are all improved ‘ies ‘0 competitive = Drift with Temperature 25,VI9C high speed instrumentation amplifiers. = Input Bias Current 40pAMax Industry best speed performance is combined with im- 3 | = Input Offset Current 40pA Max pressive precision specifications: less than 10pA input — Drift with Temperature (to 70°C) O.5pAl°C bias and offset currents, 200,V offset voltage. Unlike other FET input instrumentation amplifiers, on the LT1102 there is no output offset voltage contribution to total error, and APPLICATIONS input bias currents do not double with every 10°C rise in f : : temperature. Indeed, at 70°C ambient temperature the in- = Fast Settling Analog Signal Processing = Multiplexed Input Data Acquisition Systems put bias current is only 50pA. = High Source Impedance Signal Amplification from High Resistance Bridges, Capacitance Sensors, Photodetec- tor Sensors a Bridge Amplifier with <1HzLowpass Filtering SS Wideband Instrumentation Amplifier with +150mA Output Current Slew Rate vtestev i y ' th “Uttoe OUT SON i ! i Shas = 2a L OUP = SV INTO 2000 TO Sa = 2000) ©6510 0500 = Vo=-15V DRIVES 2.2nF CAP LOAD GAIN = 10, DEGRADED 0.01% DUE TO LT1010 SS LT Wee 3-23

T1102 : pe ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION Operating Temperature Range KO) Talore LT1102MH LT1102AMILT1102M oo... see eee eee ee = 55°C to 125°C ce q LT1102ACH LT1102) oo. eeceeeeeeeeeseeseeeensee 40°C to 85°C a om ame OlE L71102CH LTA102ACILTI1026 oo. eeee cece eee ee OPC to 70°C © Storage Temperature Range V~ (CASE) LT1102IN8 en i] Fsjoureut| — LT1102ACN8 E | LT1102CN8 een Pe, | = LT1102Mu8 L71102CJ8 -IN pot f6]+in rg Ts " J PACKAGE N PACKAGE SLEADCERAMICDIP 8LEADPLASTIC DIP Basic Connections Settling Time Test Circuit Offset Nulling vt ONC 6 7 15V a out 15V GY 3 8 r sa 5 FS 6h 4a = [eso AI >— out "ae LAT-TOP NAT opt tg ‘ 200 Se * a GAIN = 100 see tog a 4 * HP5082-2810 1,” 5.0k vt =

6 PSs | FET PROBE

f “a = At =9100.6=10 1 wer % our Ri = 10k = 100 R2=3306 «10 Be ‘lv MULL RANGE =m 2 s ner GAIN DEGRADATION = 0.018% GAN 10 SS 3-24 LT Wee

Vg= + 15V, Vow =0V, Ta = 25°C, Gain = 10 or 100, unless otherwise noted. LT1102AMIAC LT1102M/C SYMBOL | PARAMETER MIN TYP MAX MIN TYP MAX UNITS Ge | GainError | Vo= + 10V,R, = 50k or 2k 0.010 0.050 0.012 0.070 % Gye Gain Non-Linearity G= 100, R, = 50k 3 14 4 18 ppm G=100, A, =2k 8 2 8 Py ppm G=10,R, = 50k or 2k 7 16 7 30 ppm Veg trwwtOfieetvonage [SSCS los InputOffsetGurent fo ip | tnputBlas Curent [_———S~d SSS] Input Resistance Common-Mode Vou= - 11V to8V 10? 2 Vou=8V to 11V 10" 2 Differential Mode 10 2 & Input NoiseVoltage | O.tHztotoHe | ht Input Noise Voltage fy=10Hz 7 AVINHz Density f, = 1000Hz (Note 1) 19 Ki) nViVHz Input Noise Current fy = 1000Hz, 10Hz (Note 2) 15 4 fANHZ. 3 | Density InputVoitageRange [| 10S TS £105 2115 v MRR Common-Mode 1k Source Imbalance, Voy = + 10.5V 84 98 82 7 dB Rejection Ratio PSRR Power Supply Vg= +9V to +18V 88 102 86 101 dB Rejection Ratio ig Supply Current Pog mA Vo Maximum Output R, =50k +130 +135 £130 £135 v Voltage Swing Ry =2k £120 +130 £120 +130 v BW Bandwidth G=100(Note 3) 120220 100-220 kHz G=10(Note 3) 20 35 17 35 MHz SR Slew Rate G=100, Viy= £0.13V, Vo= +5V 12 v7 10 7 Vins G=10,Viy= +1V,Vo= +5V er) 18 0 Vis Overdrive Recovery 50% Overdrive (Note 4) ee Settling Time Vo = 20V Step (Note 3) G=10t0 0.05% 18 40 18 4.0 s G=10t00.01% 3.0 65 30 65 s G=100 to 0.05% 7 13 7 13 #S G=100t0 0.01% 9 18 9 18 #8 Note 1: This parameter is tested on a sample basis only. Note 4: Overdrive recovery is defined as the time delay from the removal of Note 2: Current noise is calculated from the formula: an input overdrive to the output’s return from saturation to linear operation. in=(2qh,)"? 50% overdrive equals Viy = + 2V (G = 10) or Vy = + 200mV (G = 100). where q= 1.6 x 10~ ™ coulomb. The noise of source resistors up to 1G Note 5: This parameter is not tested. It is guaranteed by design and by swamps the contribution of current noise. inference from other tests. Note 3: This parameter is not tested. It is guaranteed by design and by inference from the slew rate measurement. Cee et

Vg = +15V, Vom =O0V, Gain = 10 or 100, - 55°C < Ta < 125°C for AMIM grades, - 40°C<T,<85°C for grades, unless otherwise noted. LT1102AM (T1102 SYMBOL | PARAMETER MIN TYP MAX MIN TYP MAX UNITS Ge G=100, Vo= + 10V, R, =50k or 2k 0.10 0.25 0.10 0.30 % G=10, Vo= + 10V, R, = 50k or 2k 0.05 0.12 0,06 0.15 % TCG Gain Error Drift G=100, Ry = 50k or 2k g 20 10 P) ppmi°C (Note 5) G=10, R= 50k or 2k 5 10 6 14 ppmicC Gut Gain Non-Linearity G=100, R, =50k 20 70 24 90 ppm G=100, A, =2k 2B 85 32110 ppm : G=10, R, = 50k or 2k 9 20 9 24 ppm Vos InputOftsetVoltage J 008409 400000 AVoglAT_| Input Offset Voltage Dritt_| (Note 5) ne Se ee log | ipuiOfisetGuren [SS SSSSSSSCSCSC~id SS CMRR Common-Mode Vom= + 10.3V 82 7 80 96 dB Rejection Ratio PSRR Power Supply . Vg= + 10V to +17V 86 100. 84 99 qB Rejection Ratio \\ Supply Current Taz 125°C a <= Vo Maximum Output R, = 50k 2125 £132 £125 £132 v Voltage Swing R.=2k +120 +126 £120 +126 Vv Vg = + 15V, Vom =OV, Gain = 10 or 100, 0°C <T,<70°C, unless otherwise noted. LT1102AC , (T1102 SYMBOL | PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Ge G=100, Vo= + 10V, Ri =50k or 2k 0.04 0.11 0.05 0.14 % G=10, Vo= + 10V, RL =50k or 2k 0,03 0.09 0.04 0.12 % TCG: Gain Error Drift G= 100, Ry =50k or 2k 8 18 9 22 ppmicC (Note 5) G= 10, Ry = 50k or 2k 5 10 6 4 ppmi°C Gut Gain Non-Linearity G= 100, R, = 50k 8 30 9 i) ppm G= 100, R, =2k "1 6 12 48 ppm G= 10, R, = 50k or 2k 8 18 8 2 ppm Vos InputOffsetVoltage fT 801000 | 230 1400 wv AVoglaT | Input Offset Voltage Drift_| (Notes) a los InputOftsetCurent [tt 0 AlggaT | InputotfsetCurrentDrift | (Notes) Tp l InputBiasCurent J 0000 pA algat | InputBiasCurrentDrft_ | (Notes) tape CMRR Common-Mode Vow = + 10.3V 83 98 81 97 dB Rejection Ratio PSRR Power Supply Vg= +10V to +17V 87 101 85 100 dB Rejection Ratio is Supply Current Ta=70°C mA Vo Maximum Output R, =50k £128 +134 £128 £134 v Voltage Swing Ru=2k +120 +128 +120 +128 Vv rr NE

. LT1102 i TYPICAL PERFORMANCE CHARACTERISTICS Smail Signal Response, G = 10 Smali Signal Response, G = 100 Slew Rate, G = 100 (Input = 50mvV Pulse) (Input = 5mV Pulse) (Input = +130mV Pulse) Tel ~ iz F if 7 2a .W= | i - i 2ha } sus ~ 2h. 2ps/OlV saeco 2us/DIV nvve-rae 2ps/DIV mvae-en0 Settling Time, G=10 Settling Time, G=10 Settling Time, G= 100 3 | (Input From -10V to +10V) (Input From +10V to -10V) (Input From -10V to +10V) = eine see eae = =< | 5 por g 5 gem | tous i in 18 gx { foul f (el ita Sov i tous fk ke Ips/DIV neo-tene ys/DIV uve 2us0V cve-wene iinet Me ievten 10¥} Capacitive Load Handling im Output Impedance vs Frequency 7 : 120 ] 7 A jf CH TI T=) fee oS See 2 t i} FA } S AG) A || , fa a aa iad ott TIT Tl] ° eee ara 2us/DIV mn mee TAT TM, ZTE 01 1 10 100 1000 1k 10k 100k 1M CAPACITIVE LOAD (nF) rve-recoe FREQUENCY (Hz) rica tro ——— AT Wee 3.07

LT1102 ; i " TYPICAL PERFORMANCE CHARACTERISTICS Gain vs Frequency Undistorted Outputvs Frequency 0 Voltage Noise vs Frequency Re] eo, AO] 2. - aera “AMISH ECT TI § ER REPS eo NTIS U8 =} tt ee geo gis N TMT’ 2 LUMI [Wiese SS 2 Nil? STINT Nest) 2 | NTT as St i sa baneslaot “40 LT SNL TIN o amin | eC TNE A” LETT UTTTESSm , 10k 100k 1M 10M 10k 100k 1M 10M 3° 10 30 100 300 tk 3k 10k FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) Input Bias Current Over Common Mode Range vs 26 the Common Mode Range 160 Warm-Up Drift 6 Temperature gutwlod_| | Pes "7 CTT eae ly [TT | Se ed a a / A an | | feb eee ie Da go tte ttt Eis ra m 55% SS gC pe bee eee) Let) bee on ae wo 32” yt 4 CT 2S 8 oy] Zee) RE 12 iy 20 2 10 A 843 Lt | | Tr EET T | thet al Tt 10 7a % 1 2 3 4 5 ry 0 ae COMMON MODE VOLTAGE (V) TIME AFTER POWER ON (MINUTES) ‘TEMPERATURE (°C) Supply Current vs Temperature Short Circuit Current vs Time ss Distribution of Offset Voltage 6 50 FLT TTT Tt] .-keE EES «fase | aa eX LL] '8SSerne Cte 2S 2 se ET ee PHSsee CS-SDEES tog eee eee aan SET TTT) Seppe ea ; SCOOT eas | 50 -25 0 25 50 75 100 125 Oo 1 2 3 08 4 0 04 08 TEMPERATURE (°C) ‘ TIME FROM OUTPUT SHORT TO GROUND (MINUTES) INPUT OFFSET VOLTAGE (mV) a 3-28 LT Wee

LT02—; ES “TYPICAL PERFORMANCE CHARACTERISTICS Gain Error vs Temperature ° Gain Non-Linearity Over Temperature 0.10 a ee; LLL [ | | Ty yy Py ce A pee ee aeeeons eee eeeeeecy, = o06 L. Eo e se tT TTT iy 2], TTT x So) | | | Tey Y| 2 6 I} +48 Botan IA ee ee AA 2 Be ORS A | a 3, [pass | | [ery en a 2 Pes ce Seer Tt TI -§0 -2 0 25 50 75 100 125 50-2 0 25 50 75 100 125 TEMPERATURE (°C) crvnes tec TEMPERATURE (°C) ieee 19620 APPLICATIONS INFORMATION Ea Inthe two op amp instrumentation amplifier configuration, Common Mode Rejection Ratio vs Frequency the first amplifier is basically in unity gain, and the second 420 amplifier provides all the voltage gain. In the LT1102 the aL] [ [em second amplifier is decompensated for gain of 10 stability, S10 So therefore high slew rate and bandwidth are achieved. 2 RN e100 Common mode rejection versus frequency is also opti- 2 a ea mized in the G = 10 mode, because the bandwidths of the 2 9 BRAN< two op amps are similar. When G = 100 this statement is 8 aaaNG no longer true. However, by connecting an 18pF capacitor 2“ |_| iN between pins 1 and 2, acommon mode AC gain is created 2 Py Ws =210V IN . to cancel the inherent roll-off. From 200Hz to 30kHz CMRR 8 | | ( Zz versus frequency is improved by an order of magnitude. rr er er eT Input Protection FREQUENCY CH) reat Instrumentation amplifiers are often used in harsh envi- Gains Between 10 and 100 ronments where overload conditions can occur. The Gains between 10 and 100 can be achieved by connecting 11 102 employs FET input transistors, consequently the — two equal resistors (=R,) between pins 1 and 2 and pins differential input voltage can be +30V (with +15V sup- 7 ang, plies, +36V with +18V supplies) Some competitive in- R strumentation amplifiers have NPN inputs which are Gain = 10 + ———*—— protected by back to back diodes. When the differential R + R,/90 input voltage exceeds +1 .3V on these competitive devices, input current increases to milliampere level; more than — The nominal value of R is 1.84kQ. The usefulness of this +10V differential voltage can cause permanent damage. method is limited by the fact that R is not controlled to : F F better than +10% absolute accuracy is production. How- When the LT1102 inputs are pulled below the negative Pree supply or above the positive supply, the inputs will clamp ine ta ny specific unit 90R can be measured between a diode voltage below or above the supplies. No damage PINS | and 2. will occur if the input current is limited to 20mA. Oe AT WER 3-29

Gain = 20, 110, or 200 Instrumentation Amplifiers Differential Output Single Ended Output | erie > uJ id > N Be A hae > our = tae = + + |" ouT IN - . Be oP Fas fe a Ue eat + GAIN = 200, AS SHOWN GAIN = 20, SHORT PIN 1 TO PIN 2, PIN 7 TO PIN 8 ON BOTH DEVICES. t GAIN = 110, SHORT PIN 1 TO PIN 2, PIN 7 TO PIN 8 ON ONE DEVICE, NOT ON THE OTHER INPUT REFERRED NOISE IS REDUCED BY V2 (G = 200 OR 20) Multiplexed Input Data Acquisition 509 OR EQUIVALENT ~ SiAQ—0T 0 ook Eas > weut [| S18Q-——r—1ro7 © , eS 508 tas F ' 1 ' 53-S AQ AT EN ‘800kHz SIGNALS CAN BE MULTIPLEXED WITH LT1102 ING = 10 urnees Tio Voltage Programmable Current Source is Simple and Precise Dynamic Response of the Current Source Vin O—+10V i Zz A=SV/OIV i t i eae } / + fest B= 5mA/DIV /\\ \\ | M+ ' - vit | TE i © unst0z R is > Bx 100 : Gu) 3 10a: =D be i Ty * = PRECISION FILM TYPE SN tow HORIZ. = 20)8/0V suse coves SY