LT1101AMJ8

LT1101 LINER | Alldatasheet

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es LIN . T1101 TECHNOLOGY Precision, Micropower, Singlé Supply Instrumentation Amplifier (Fixed Gain =10 or 100) FEATURES DESCRIPTION = Gain Error 0.04% Max The LT1101 establishes the following milestones: @ Gain Non-Linearity 0.0008% (8ppm) Max (1) It is the first micropower instrumentation amplifier, = Gain Drift 4ppmi°C Max —_ (2) tis the first single supply instrumentation amplifier, = Supply Current 105A Max —_ (3) It is the first instrumentation amplifier to feature fixed = Offset Voltage 160,V Max gains of 10 and/or 100 in low cost, space-saving 8-lead = Offset Voltage Drift 0.4uV/°C Typ packages. = Offset Current 600pA Max. The LT1101 is completely self-contained: no external gain = CMRR, G= 100 100dB Min setting resistor is required. The LT1101 combines its mi- m O.1Hzto 10Hz Noise O.8:VP-P TYP cropower operation (75yA supply current) with a gain error ; ; 2.3PAR-DTYP of 0.008%, gain linearity of 3ppm, gain drift of 1ppm/°C. = Gain Bandwidth Product 250kHzMin — The output is guaranteed to drive a 2k load to + JOV with 3 | . angle or Dual Supply Operation excellent gain accuracy. s Surface Mount Package Avallable Other precision specifications are also outstanding: 50,V input offset voltage, 130pA input offset current, and low APPLICATIONS drift (0.4,v/°C and 0.7pAI°C). In addition, unlike other in- strumentation amplifiers, there is no output offset voltage a Differential Signal Amplification in Presence of contribution to total error. Common-Mode Voltage ee gs F F : ‘ i" A full set of specifications are provided with +15V dual w Micropower Bridge Transducer Amplifier supplies and for single 5V supply operation, The LT1101 Strain Gau i can be operated from a single lithium cell or two Ni-Cad -Thermi Om batteries. Battery voltage can drop as low as 1.8V, yet the 4 . LT1101 still maintains its gain accuracy. In single supply : Prperetial Vltage fo Curent Converter applications, both input and output voltages swing to 4mA-20mA Bridi ‘ Tran vatter within a few millivolts of ground. The output sinks current ~ . o while swinging to ground — no external, power consum- ing pull down resistors are needed. BLOCK DIAGRAM ROUND 1 O Gain Error Distribution (REF) ‘ouTPUT 0 T1065 . s 5 |_| Feet = oH were 3 wean seas | 004 =008-0.02-001 04001 400240004004 GROUND PIN 1, QUTPUT AT PIN B GAN ERROR (¥) 10; NO AGOTIONAL CONNECTIONS G10: SaORT W210 PN, SHORT PIM 7 TO PIN 7 @ AP hia 3-11

LT1101 ‘ a ABSOLUTE MAXIMUM RATINGS NN PACKAGE/ORDER INFORMATION Tor vew ORDER PART rove ORDER PART a Oe NUMBER mo TT Lejourur NUMBER Joma Prod LT1101AMH E an on | LT1101AIN8 wd Palas LTH101MH oa rye, | LTit01INa rn aha LT1101ACH Flt LTT01ACN8 Vel. LT1101CH -wy Ls] LH [5] LT1101CN8

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ELECTRICAL CHARACTERISTICS

Vg =5V, OV, Vom =0.1V, VREF(PIN 1) = 0.1V, G = 10 or 100, Ta = 25°C, unless otherwise noted (Note 3). er a SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS: G= 10,R, =50k (Note 1) 3 7 3 8 ppm L71101S 250 600 Ww los [Input Offset Curent [tS 0S 00 nk ' | InputBiasCurent [Tt is [SuppiyGurent Pew 3-12 AT Ne

Vs =5V, OV, Vom =0.1V, VREF(PIN 1) =0.1V, G = 10 or 100, Ta = 25°C, unless otherwise noted (Note 3), ~~” LT1101AM/AUIAC LTHO1M/VCIS ‘SYMBOL MIN TYP MAX MIN TYP MAX UNITS CMRR Common-Mode 1k Source imbalance Rejection Ratio G= 100, Voy=0.07V to3.4V % = 106 92 105 ¢B G=10, Voy=0.07V to3.1V 84100 82.0 oB WinimumSuppiyVotage [ (Noted) | S| Vo Maximum Output Output High, 50k toGND 41 43 41 43 v Voltage Swing Output High, 2k to GND 35 39 35 39 v Output Low, Vacr=0, No Load 33 6 3.3 6 mv Output Low, Veer =0, 2k toGND 05 1 05 1 mv . Output Low, Vier =0, tgnk = 10024 130 Ey 130 mV Bw Bandwidth G=100(Note 1) 20 30 kHz G=10(Note 1) 2 38 kHz SR [SiewRate | WNotet) e007 004 007 Vis Vg = + 15V, Vom =0V, Ta = 25°C, Gain = 10 or 100, unless otherwise noted. LTHOIMICIS ‘SYMBOL CONDITIONS MIN TYP MAX UNITS & G= 100, Vo= + 10, R =50k 0.008 0.040 0.008 0.060 % G= 100, Vo= # 10V,R, =2k 0011 0.055 012 0.070 % G= 10, Vo= + 10V, Ry = 50k oF 2k 0.008 0.040 0,009 0.060 % Gut Gain Non-Linearity G= 100, R, = 50k 7 6 8 2 ppm G=100, R= 2k a 3 8 ppm G= 10, R, = 50k or 2k 3 8 3 9 ppm Vos, Input Offset Voltage 60 2 wv Umn01s 250-600 w log | Input ttsetCurrent_ [| 0.13 0.60 0.18 090 nA ls | InputBiasCurent [tn Input Resistance Common-Mode (Note 1) 4 7 3 7 Go Differential Mode (Note 1) 7 12 5 12 Go & Input Noise Voltage 0.1H2to THz (Note 2) © D Input Noise Voltage {y= 10Hz (Note 2) & nViVHZ Density fo= 1000Hz (Note 2) gB nVIVHZ is Input Noise Current 0.1Hzto 10Hz (Note 2) Ee <2 Input Noise Current fo= 10H2 (Note 2) 006 0.10 0.06 PAW Density fo= 1000Hz 0.02 0.02 pAINHZ Input Voltage Range G=10 +130 +138 +130 +138 v -144 0 -147 -44 0-147 v G=10 +115 +125 $115 +125 Vv -130 -13.3 130-133 v CMRR Common-Mode 1k Source Imbalance Rejection Ratio G= 100, Over CM Range 10112 9% 112 4B G= 10, Over CM Range 84 100 82 EJ 4B PSRR Power Supply Vg = +2.2V, -0.1V to + 18V 100 Ney 4B Rejection Ratio é \\ Supply Current ee 4180 sa Vo Maximum Output R.=50k +130 +142 v Voltage Swing R= 2k £110 £132 Vv Bw Bandwidth G= 100 (Note 1) 2335 23°35 kHz G= 10(Note 1) 3 7 3 7 kHz SR [ Sewrate | 008010 Vas Note 1: This parameter is not tested. It is guaranteed by design and by Note 4: Minimum supply voltage is guaranteed by the power supply inference from other tests. rejection test. The LT1101 actually works at 1.8V supply with minimal Note 2: This parameter is tested on a sample basis only. degradation in performance. Note 3: These test conditions are equivalent to Vs = 4.9V, -0.1V, Voy =0V, Vperin 9 = OV. Ss

ee E____ EV Vs = + 15V, Vom =OV, Gain = 10 or 100, - 55°C <T,< 125°C for AMIM grades, - 40°C <T, <85°C for Alll grades, unless otherwise noted. cy G= 100, Vo= + 10V, R, = 50k 0.024 0.070 0.028 0.100 ‘% G= 100, Vo= + 10V, A =5k 0.030 0.100 0.035 0.130 % G= 10, Vo= + 10V, Ry = 50k or 5k 0.015 0.070 0.018 0.100 % TCG. Gain Error Drift G= 100, A, = 50k 2 4 ppmiec (Note 1) G= 100, R, =5k 2 7 ppmiec G=10, Ry, = 50k or 5k 1 4 ppm Gu Gain Non-Linearity G= 100, A, =50k ry 70 J 9 ppm G= 100, RL =5k 7 300 7 = 500 ppm G=10,R, =50k 4 13 5 15 ppm G=10,R,=5k 10 40 2 6 bpm Yos InputOtisetVotage [TO 00 w AVogAT | InputOttset Voltage Dri | (Notes) | O20 0528 sVieC os | InputOttsetCurent | 0.16 0.80 0.19 1.30 nA AlggAT | InputOftset Current Orit | (Notes) || 087.0 pAnC 'g | inputBiasCurent [| nA alyaT Input Bias Current Drift | (Notes) Tt Tt MRR Common-Mode G= 100, Voy= - 14.4V to 13¥ % m1 4 m1 qB Rejection Ratio G=10, Voy = - 13V to 11.5V 80 9 7% 8 dB PSRR Power Supply Vs= +3.0, -0.1V to + 18V 98 110 a8 Rejection Ratio ig [Supply Curent P05 105 108190 rn Yo Maximum Output R,=50k 2125 £140 £125 £140 Vv Voltage Swing A, =5k 2110 £135 211.0) £135 v Vs = + 15V, Vom =0V, Gain = 10 or 100, 0°C<T,<70°C, unless otherwise noted. srwso. | rameren | conomons | uw uae | um wax | unre G& G= 100, Vo= + 10¥, Ry =50k 0.012 0.055 0.014 0.080 %% G= 100, Vo= + 10V,R, =2k 0.018 0.085 0.020 0.100 % G=10, Vo= + 10V, R, = 50k of 2k 0.009 0.055 0.010 0.080 % TCGe Gain Error Drift G= 100, Ri = 50k ppmeC (Note 1) G=100,R,=2k ppm G= 10, Ry =50k oF 2k pom Gu Gain Non-Linearity G= 100, R, = 50k 9 8 0 ppm G= 100, A, =2k B % © 100 ppm G= 10, R= 50k or 2k 4 10 4 "1 ppm 300800 wv #VPC os InputOftsetCunent TO | O47 1.10 nA Alo/aT | InputOftset Current Orit | (Note) | 05 40 parc [| ImputBiesCurent J nA alglat InputBiasCurrentOnitt | (Notes) | HTPC CMRR Common-Mode G= 100, Voy= - 14.4V to 13V 98 12 96 112 dB Rejection Ratio G= 10, Voy= - 13Vt0 11.5V 8&2 100 80 9 dB PSAR Power Supply Vs=2.5, -0.1V to + 18V 100 2 dB Rejection Ratio \\ Supply Current a 2A Yo Maximum Output Ri, =50k £125 £144 Vv Voltage Swing R= 2k #105 +130 v a

Vg =5V, OV, Vom=0.1V, VRer(piN 1)=0.1V, Gain = 10 or 100, - 55°C <T,<125°C for AM/M grades, - 40°C <T, <85°C for Alll grades, unless otherwise noted. LT1107AMIAL SYMBOL | PARAMETER CONDITIONS MIN, TYP MAX UNITS OG taneroroan Fase por Gu Gain Non-Linearity G= 100, Ry = 50k ppm G= 10, R, = 50k (Note 1) ppm Veg [tnputotetvotage [Sd Drift bg InputOrsetCunent | ox6 080 [ore 130m Drift ip InputBiasCurent [te Drift CMRR ‘Common-Mode G= 100, Voy=0.1V 03.2V 1 105 88 (104 dB Rejection Ratio G=10,Vow=0.1Vt029V,Vacr=0.15V | 80 98 79 4B \\ Supply Gurrent a | Vo Maximum Output Output High, 50k to GND 38 41 38 41 v Voltage Swing Output High, 2k to GND 30 37 30 37 v Output Low, Vag =0, No Load 45° 8 45° 8 mv Output Low, Vaer=0, 2k to GND Or 18 o7 15 my Output Low, Vaer=0, lynx = 100uA 125 170 125170 mv Vg = 5V, OV, Vom =0.1V, Vrer(pin 1) =0.1V, Gain = 10 or 100, 0°C <T, <70°C, unless otherwise noted. LTn0icis SYMBOL MIN TYP MAX UNITS TCG Gain Error Drift Fy =50k (Note 1) a SO G= 10, Ry = 50k (Note 1) 4 10 ppm Uno1s 300800 wv AVogAT | Input Offset Voltage 05 (28 HPC Drift 12 45 avec, os InputOttsetCurrent [te 070 Tonto na Drift ri [ inputBiasGurent ft AlplaT Input Bias Current (Note 1) parC Drift MAR ‘Common-Mode @= 100, Vow =0.07V 103.3 93 105 9% 104 8 Rejection Ratio G=10,Voy=0.07Vt03.0V, Vper=0.15V | 82 99 a) 8 ? Supply Current Powe Vo Maximum Output Output High, 50k to GND 40 42 40° 42 v Voltage Swing Output High, 2k to GND 33 38 33° 48 v Output Low, Vaer=0, No Load 4 7 467 mv ‘Output Low, Vagr=0, 2k to GND 06 12 06 12 mv Output Low, Ver =0, lynx = 100nA 100150 100150 my a

= ANCE CHARACTERISTICS TYPICAL PERFORM ie thearty Gain vs Frequency Gain 0 No inet Dialer aa A ae bution 7 . amt | | Th Pp osee “TT hn ICN : 5 1 | | mawvts 2 bee IR PACKAGES: A HT H ll E ‘HL yee Peer cae” a ob HAE A s | eon] Fe ae) os | ay | . Pcie ee “CHIE ETN ueee 3 “a se ° = an NON-LINEARTY (PPM) | . ~~ vata an Or Input Offset Voltage Distribution Gain Non-| " "= 25° Gain Error Over Temperature emer ure WH a | Hh AND AT Vg= 2 15V zs fi =50k mer, Fi || tp LA am Pieecclae —— [Oo Sa om 10 m1 : assueee es om INPUT OFFSET VOLTAGE (nV) - 2 oP itt 100 125 - -25 ° veupenaTunt (2c) a ~ —_ Input Bias and Olset Curent vs Weds Valage erro Tae] Supply Current vs Temperature aaa =e Cam = Lee EEE RAE aes == , ° 3 - —o = wl roy LT | & 100 PP : ; ff | DCPPTT -EEEEEEH TEL MEAT j. PCEEESS Hh PAH = ae oo i” ‘ IMON-MODE VOLTAGE (V) alti t I 10135 80 a 2 eu vo 101 "i “9 ° seMPeRaTUne (°0) eee 3-16

. LT1101 ae TYPICAL PERFORMANCE CHARACTERISTICS i Power Supply Rejection Ratio vs Common-Mode Rejection Ratio vs Common-Mode Range vs Supply Frequency Frequency vs Voltage re 120 Seal Tl i “Ss | | Sao TEEN SRR cet iNet B° SCT & ‘COLORS | E° CMa HN & Pi t\\ N By+ea ~ 95°C Fi Nt i. WO CO) 220 TCT Nee LET g Liat NY heer] TING) 8 TTT | feet ee TN an PS REE e ce Bel FCT i se Vara ube 2 £14416 £18 10 100 or "Faeoueney (na) om 100 Oo 42 4 Suen vorTace “ee FREQUENCY (Hz) Ea Output Saturation vs Temperature Qutput Voltage Swing vs Load Short Catt Curent vs Tine Sink Current SSS EI ae —— = ve tmnt af Sl me naleow| — 71 _] ~'PTs5°c S Fj Ax ty= 425%, vse 21v + En (ol tine eee = TIM TIM PN f@ =e _ ESS = 2 -—+-—+ — SSS = == esl MNO faces SSa N/a Pec

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° a s eae = Ta= #25°C, Vom 2 15V-}—— SS ve +t | ie =) Te “9 “5 0 25 50 75 100 125 00 URGING OR SINKING LORD CURRENT (ms) ° TIME FROM OUTPUT SHORT TO GROUND (MINUTES) TEMPERATURE (°C) Pequeey. Output Swing vs Output Impedance vs Frequency iti id Handlin requ oem "oom ce = CTT TTT eee ALIM TMT = EPP TTte scene 2 Pa SCR CTI: COTS ee eee

4 NV Fy

mull! ee a 29 Bese raneee Ee Ta) MUN tm | 2g, f é i 2 IAAT 2 TT VOACL LI Om) it = CUMIN NIN Il « HAGEL gE TTI) MXC LUI § a4 * “TT 0 2 . e Annnnnenm A TT VI RH LZ “CAUTION, NMSSM “EEE ‘ a 1 “to 100 “oo ik tok 100 ” 10% AEQUENCY (Hz) ot CAPACITIVE LOAD (nF) FREQUENCY (Hz) eee 3-17 LINEAR 7 @ Abies"

T1101 : ane TYPICAL PERFORMANCE CHARACTERISTICS Large Signal Transient Response Noise Spectrum Warm-Up Drift G=10,Vs=5V,0V 1000 or 0O8 22 hy 30 IMMEASURABLY LOW | fry \\ ze 5 , eee eo UNWEIT =e | a CSE boo LUM iy TM AE ora nalts mine 01 1 10 100 1000 0 1 2 3 FREQUENCY (Hz) TIME AFTER POWER ON (MINUTES) Large Signal Transient Response Large Signal Transient Response Large Signal Transient Response G=10,Vs= + 15V G=100, Vg= + 15V G=100,V5=5V,0V ; eto /0N 2005/0 : 1004s/01V ; NO LOAD NO LOAD OUTPUT FROM OV TO 4.5V, NO LOAD Small Signal Transient Response Small Signal Transient Response Small Signal Transient Response G=10,Vs=5V,0V G=10,Vs= + 15V G = 100, Vs =5V, OV a oe _— i a ad 20ns/DIV 20ps/DIV 200us/DIV OUTPUT FROM 0.05V TO 0.15V, NO LOAD (RESPONSE WITHVoe o T5v Ge TOTS eorricaly SSS 3-18 OD nee

. LT1101 Oe TYPICAL PERFORMANCE CHARACTERISTICS , Single Supply: Minimum Single Supply: Minimum Output Common-Mode Voltage vs Output Voltage vs Common-Mode Minimum Supply Voltage vs Voltage Voltage = Temperature 120 10 25 - FMLUIT L] veniavT9 Poot ae L] [ [ J [iw] Ea CO fice JAPA) gS tT Pett reece e | Test PV] § [ogi a LL Terr] = | fesse frasee A 3 ss fest mmm sur Ps} | 3 Hee eo es WATAAY e-er. e “OA eer LOZ ed 3 0 fo Asa ay NL TA z Se = it 5 A a Ra (CLECs Ae)? ($e 0 2 4 6 8 10 12 0 10 20 30 40 50 60 70 80 90 100 = -50 -25 0 2 50 75 100 125 OUTPUT VOLTAGE (V) MINIMUM OUTPUT VOLTAGE (mV) z TEMPERATURE (°C) EZ a APPLICATIONS INFORMATION Single Supply Applications When the output is high and input common-mode is low, . wae . aes Le the output of amplifier A has to sink current coming from The 111101 is the first instrumentation amplifier which is the output of amplifier B. Since amplifier Ais effectively in fully specified for single supply operation, i.e. when the nity gain, its input is limited by its output. negative supply is OV. Both the input common-mode range . and the output swing are within afew millivolts of ground. —_Gommon-Mode Rejection vs Frequency Probably the most common application for instrumenta- Th ‘anti F . vine a va . or @ common-mode rejection ratio (CMRR) of the LT1101 tion amplifiers is amplifying a differential signal from @ starts to roll off at a relatively low frequency, However, as transducer or sensor resistance bridge. All competitive im shown on the CMRR vs Frequency plot, CMRR can be en- Strumentation amplifiers have a minimum required com- anced significantly by connecting an 82pF capacitor be- mor-mode voltage which is $V to SV above the negative tween ping 1 and 2. This improvement is only available in supply. This means that the voltage across the bridge has the gain 100 configuration and it is in excess of 30dB at to be 6V to 10V or dual supplies have to be used, i.e. mi- 60Hz , cropower, single battery usage is not attainable on com- ” petitive devices. Offset Nulling . hi .. _ terminals. In many bridge transducer or sensor applica- vont mon mode voltage is high and the output is low, cur tions, calibrating the bridge simultaneously eliminates the will flow from the output of amplifier Ainto the output =, ti tat lifier’s offset ( Fi of amplifier B. See the Minimum Output Voltage vs Com. —‘'Nstrumentation amplitier s offset as a source of error. For mon-Mode Voltage plot example, in the Micropower Remote Temperature Sensor : Application shown, one adjustment removes the offset er- Similarly, the Minimum Common-Mode Voltage vs Output —_rors due to the temperature sensor, voltage reference and Voltage plot specifies the expected common-mode range. the LT1101. SY LY ue 3-19

' Asimple resistive offset adjust procedure is shown below. — Gains Between 10 and 100 If R=50 for G=10, and R =500 for G = 100 then the effect . . . of R on gain error is approximately 0.006%. Unfortunately, Gains between 10 and 100 can be achieved by connecting about 450,A has to flow through R to bias the reference two equal resistors (= R,) between pins 1 and 2 and pins 7 terminal (pin 1) and to null-out the worst-case offset volt. and8. age. The total current through the resistor network can ex- R ceed 1mA, and the micropower advantage of the LT1101 is Gain = 10+ ——* _ lost. R+R,/90 + im The nominal value of R is 9.2kQ. The usefulness of this method is limited by the fact that R is not controlled to 3, l: better than + 10% absolute accuracy in production. How- iret > ever, on any specific unit 90R can be measured between Dat pins 1 and 2. 20k Input Protection Instrumentation amplifiers are often used in harsh envi- fonments where overload conditions can occur. The LT1101 employs PNP input transistors, consequently the ~8v differential input voltage can be +30V (with +15V sup- . | plies, + 36V with + 18V supplies) without an increase in in- Another offset adjust scheme uses the LT1077 micro: put bias current. Competitive instrumentation amplifiers power op amp to drive the reference pin 1.Gainerrorand have NPN inputs which are protected by back to back common-mode tejection are unaffected, the total current diodes. When the differential input voltage exceeds increase is 45yA. The offset of the LT1077 is trimmed and 4.3 on these competitive devices, input current in- amplified to match and cancel the offset voltage of the creases to the milliampere levels more than + 10V differen- LT1101. Output offset null range is + 25mV. tial voltage can cause permanent damage. é 12vT0 18y When the LT1101’s inputs are pulled above the positive 3 pe ~~ sk POT supply, the inputs will clamp a diode voltage above the 5 aue> positive supply. No damage will occur if tne input current ng SS ; is limited to 20mA. > + 5000 resistors in series with the inputs protect the LT1101 _ when the inputs are pulled as much as 10V below the I~ | 3% negative supply. —1.2V TO -18V SSS 3-20 LY ie

Micropower, Battery Operated, Remote Temperature Sensor 4mA to 20mA Loop Receiver av REMOTE TEMP SENSOR iv 1M134-3 | 75k wn LT 1004-1.2 La ! 15k urt004 ~) I 12

22100 I hoop = Ps

620 1 . PS tor I ok p> AP Ria, 7 ‘OuTPUT i PoT E: i out 62.50 5k Fags > es tomvec 18K {| —+ | 100na = = = 1 °K 4mA TO 20mA IN — OV TO 10V OUT I TRIM OUTPUT TO SV AT 12mA IN 3 | TRIM OUTPUT TO 250mv AT 25°C . TEMPERATURE RANGE =2.5°C TO 150°C ACCURACY = + 0.5°C Instrumentation Amplifier with + 150mA Output Current Voltage Controlled Current Source Vta tiv [17 av 6 5 Vin SS 6 ce 01 out 3 Lo € A f A + cad C | -1.5V Tour = Vr =-15V RL lop = 200M W GAIN = 10, DEGRADED BY 0.01% DUE TO LT1010 a) = QUTPUT = & 10V INTO 7582 (TO 1.5kHz) Igyt=OmA TO 5mA ~ DRIVES ANY CAPACITIVE LOAD VOLTAGE COMPLIANCE =6.4V SINGLE SUPPLY APPLICATION (V+ =5V. V~ =0V) (R209) Vour min= 120mV, Vour max=3.4V Differential Voltage Amplification from a Resistance Bridge “on setSon ae OR SENSOR > RESISTANCE Fain @ BRIDGE = 8 oto > our MINIMUM VOLTAGE ACROSS BRIDGE =20mV_ MINIMUM SUPPLY VOLTAGE = 1.8V = CF

LT1101 . ee ooo APPLICATIONS INFORMATION Gain = 20, 110 or 200 Instrumentation Amplifiers Differential Output Single Ended Output - - hs ~ i > BS 1 GAIN=200, AS SHOWN {_ y GAIN = 20, SHORT PIN 1 TO PIN 2, PIN 7 TO PINS - ON BOTH DEVICES 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) SSS 3-22 LT Whee