LT1124/LT1125 Dual/Quad Low Noise, High Speed Precision Op Amps FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION

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1 FEATURES n % Tested Low Votage Noise:.7nV/ Hz Typ 4.nV/ Hz Max n Sew Rate: 4.5V/μs Typ n Gain Bandwidth Product:.5MHz Typ n Offset Votage, Prime Grade: 7 Max Low Grade: Max n High Votage Gain: 5 Miion Min n Suppy Current Per Ampifi er:.75ma Max n Common Mode Rejection: db Min n Power Suppy Rejection: db Min n Avaiabe in 8-Pin SO Package APPLICATIONS n Two and Three Op Amp Instrumentation Ampifiers n Low Noise Signa Processing n Active Fiters n Microvot Accuracy Threshod Detection n Strain Gauge Ampifi ers n Direct Couped Audio Gain Stages n Tape Head Preampifi ers n Infrared Detectors TYPICAL APPLICATION Instrumentation Ampifi er with Shied Driver DESCRIPTION LT4/ Dua/Quad Low Noise, High Speed Precision Op Amps The LT 4 dua and quad are high performance op amps that offer higher gain, sew rate and bandwidth than the industry standard OP-7 and competing OP-7/ OP-47 op amps. In addition, the LT4/ have ower I B and I OS than the OP-7; ower V OS and noise than the OP-7/OP-47. In the design, processing and testing of the device, particuar attention has been paid to the optimization of the entire distribution of severa key parameters. Sew rate, gain bandwidth and khz noise are % tested for each individua ampifi er. Consequenty, the specifi cations of even the owest cost grades (the LT4C and the C) have been spectacuary improved compared to equivaent grades of competing ampifiers. Power consumption of the LT4 is one haf of two OP-7s. Low power and high performance in an 8-pin SO package make the LT4 a first choice for surface mounted systems and where board space is restricted. For a decompensated version of these devices, with three times higher sew rate and bandwidth, pease see the LT/LT7 data sheet. L, LT, LTC, LTM, Linear Technoogy and the Linear ogo are registered trademarks of Linear Technoogy Corporation. A other trademarks are the property of their respective owners. Protected by U.S. Patents incuding , INPUT GUARD GUARD 8 /4 /4 /4 9 4 k R F.4k R G Ω R G Ω R F.4k k k 5V 5 4 /4 5V 7 k OUTPUT GAIN = ( R F /R G ) POWER BW = 7kHz SMALL-SIGNAL BW = 4kHz NOISE =.8/ Hz AT OUTPUT V OS = 5 PERCENT OF UNITS Input Offset Votage Distribution (A Packages, LT4 and ) T A = 5 C 758 DUALS QUADS UNITS TESTED INPUT OFFSET VOLTAGE () 4/5 TA 4/5 TA

2 LT4/ ABSOLUTE MAXIMUM RATINGS (Note ) Suppy Votage...±V Input Votages...Equa to Suppy Votage Output Short-Circuit Duration... Indefinite Differentia Input Current (Note )...±5mA Lead Temperature (Sodering, sec)... C Storage Temperature Range...5 C to 5 C Operating Temperature Range LT4AC/LT4C AC/C (Note )...4 C to 85 C LT4AI/LT4I...4 C to 85 C LT4AMP/MP C to 5 C LT4AM/LT4M AM/M OBSOLETE C to 5 C PIN CONFIGURATION TOP VIEW IN A V IN B IN B 4 TOP VIEW A B IN A OUT A V OUT B S8 PACKAGE 8-LEAD PLASTIC SO T JMAX = 4 C, θ JA = 9 C/W NOTE: THIS PIN CONFIGURATION DIFFERS FROM THE 8-PIN PDIP CONFIGURATION. INSTEAD, IT FOLLOWS THE INDUSTRY STANDARD LTDS8 SO PACKAGE PIN LOCATIONS OUT A IN A IN A V 4 A N8 PACKAGE 8-LEAD PDIP T JMAX = 4 C, θ JA = C/W B V OUT B IN B IN B J8 PACKAGE 8-LEAD CERAMIC DIP T JMAX = C, θ JA = C/W OBSOLETE PACKAGE Consider the N8 for Aternate Source OUT A IN A IN A V 4 IN B 5 IN B OUT B 7 NC 8 TOP VIEW A D B C SW PACKAGE -LEAD PLASTIC SO WIDE T JMAX = 4 C, θ JA = C/W OUT D IN D IN D V IN C IN C OUT C NC OUT A IN A IN A V IN B IN B OUT B A B TOP VIEW 4 OUT D IN D IN D V IN C 9 IN C 8 OUT C N PACKAGE 4-LEAD PDIP T JMAX = 4 C, θ JA = C/W (N) J PACKAGE 4-LEAD CERAMIC DIP T JMAX = C, θ JA = 8 C/W OBSOLETE PACKAGE Consider the N for Aternate Source D C

3 LT4/ ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT4CS8#PBF LT4CS8#TRPBF 4 8-Lead Pastic SO 4 C to 85 C LT4AIS8#PBF LT4AIS8#TRPBF 4AI 8-Lead Pastic SO 4 C to 85 C LT4IS8#PBF LT4IS8#TRPBF 4I 8-Lead Pastic SO 4 C to 85 C LT4AMPS8#PBF LT4AMPS8#TRPBF 4AMP 8-Lead Pastic SO 55 C to 5 C CSW#PBF CSW#TRPBF CSW -Lead Pastic SO Wide 4 C to 85 C MPSW MPSW#TR MPSW -Lead Pastic SO Wide 55 C to 5 C LT4ACN8#PBF LT4ACN8#TRPBF LT4ACN8 8-Lead PDIP 4 C to 85 C LT4CN8#PBF LT4CN8#TRPBF LT4CN8 8-Lead PDIP 4 C to 85 C ACN#PBF ACN#TRPBF ACN 4-Lead PDIP 4 C to 85 C CN#PBF CN#TRPBF CN 4-Lead PDIP 4 C to 85 C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT4CS8 LT4CS8#TR 4 8-Lead Pastic SO 4 C to 85 C LT4AIS8 LT4AIS8#TR 4AI 8-Lead Pastic SO 4 C to 85 C LT4IS8 LT4IS8#TR 4I 8-Lead Pastic SO 4 C to 85 C CSW CSW#TR CSW -Lead Pastic SO Wide 4 C to 85 C LT4ACN8 LT4ACN8#TR LT4ACN8 8-Lead PDIP 4 C to 85 C LT4CN8 LT4CN8#TR LT4CN8 8-Lead PDIP 4 C to 85 C ACN ACN#TR ACN 4-Lead PDIP 4 C to 85 C CN CN#TR CN 4-Lead PDIP 4 C to 85 C LT4CJ8 LT4CJ8#TR LT4CJ8 8-Lead CERAMIC DIP 55 C to 5 C LT4AMJ8 LT4AMJ8#TR LT4AMJ8 8-Lead CERAMIC DIP 55 C to 5 C LT4MJ8 LT4MJ8#TR LT4MJ8 8-Lead CERAMIC DIP 55 C to 5 C CJ CJ#TR CJ 4-Lead CERAMIC DIP 55 C to 5 C AMJ AMJ#TR AMJ 4-Lead CERAMIC DIP 55 C to 5 C MJ MJ#TR MJ 4-Lead CERAMIC DIP 55 C to 5 C OBSOLETE PACKAGE Consut LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a abe on the shipping container. For more information on ead free part marking, go to: For more information on tape and ree specifi cations, go to:

4 LT4/ ELECTRICAL CHARACTERISTICS T A = 5 C,, uness otherwise noted. SYMBOL PARAMETER CONDITIONS (Note ) V OS Input Offset Votage LT4 ΔV OS ΔTime Long-Term Input Offset Votage Stabiity I OS Input Offset Current LT4 LT4AC/AI/AM AC/AM LT4C/I/M C/M TYP MAX TYP MAX UNITS.. /Mo I B Input Bias Current ±7 ± ±8 ± e n Input Noise Votage.Hz to Hz (Notes 8, 9) 7 7 nv P-P Input Noise Votage Density f O = Hz (Note 5) f O = Hz (Note ) i n Input Noise Current Density f O = Hz f O = Hz nv/ Hz nv/ Hz pa/ Hz pa/ Hz V CM Input Votage Range ± ±.8 ± ±.8 V CMRR Common Mode Rejection Ratio V CM = ±V 4 db PSRR Power Suppy Rejection Ratio V S = ±4V to ±8V 4 db A VOL Large-Signa Votage Gain R L k, V OUT = ±V R L k, V OUT = ±V V OUT Maximum Output Votage Swing R L k ± ±.8 ±.5 ±.8 V SR Sew Rate R L k (Notes, 7) V/μs GBW Gain Bandwidth Product f O = khz (Note ) MHz Z O Open-Loop Output Resistance V OUT =, I OUT = Ω I S Suppy Current per Ampifi er ma Channe Separation f Hz (Note 9) V OUT = ±V, R L = k db V/ V/ The denotes the specifi cations which appy over the 55 C T A 5 C temperature range,, uness otherwise noted. SYMBOL PARAMETER CONDITIONS (Note ) V OS Input Offset Votage LT4 ΔV OS ΔTemp Average Input Offset Votage Drift I OS Input Offset Current LT4 LT4AM AM LT4M M TYP MAX TYP MAX UNITS (Note 5) / C I B Input Bias Current ±8 ±55 ± ±7 V CM Input Votage Range ±. ± ±. ± V CMRR Common Mode Rejection Ratio V CM = ±.V db PSRR Power Suppy Rejection Ratio V S = ±4V to ±8V 4 db A VOL Large-Signa Votage Gain R L k, V OUT = ±V R L k, V OUT = ±V V OUT Maximum Output Votage Swing R L k ±.5 ±. ± ±. V SR Sew Rate R L k (Notes, 7)..8.8 V/μs I S Suppy Current per Ampifi er ma V/ V/ 4

5 LT4/ ELECTRICAL CHARACTERISTICS The denotes the specifi cations which appy over the C T A 7 C temperature range,, uness otherwise noted. SYMBOL PARAMETER CONDITIONS (Note ) V OS Input Offset Votage LT4 ΔV OS ΔTemp Average Input Offset Votage Drift I OS Input Offset Current LT4 LT4AC AC LT4C C TYP MAX TYP MAX UNITS (Note 5)..4.5 / C I B Input Bias Current ±8 ±5 ±9 ±45 V CM Input Votage Range ±.5 ±.4 ±.5 ±.4 V CMRR Common Mode Rejection Ratio V CM = ±.5V 9 5 db PSRR Power Suppy Rejection Ratio V S = ±4V to ±8V 5 7 db A VOL Large-Signa Votage Gain R L k, V OUT = ±V R L k, V OUT = ±V V OUT Maximum Output Votage Swing R L k ±.5 ±.7 ± ±.7 V SR Sew Rate R L k (Notes, 7) V/μs I S Suppy Current per Ampifi er.4.4 ma V/ V/ The denotes the specifications which appy over the 4 C T A 85 C temperature range,, uness otherwise noted. (Note ) SYMBOL PARAMETER CONDITIONS (Note ) V OS Input Offset Votage LT4 ΔV OS ΔTemp Average Input Offset Votage Drift I OS Input Offset Current LT4 LT4AC/AI AC LT4C/I C TYP MAX TYP MAX UNITS (Note 5)..4.5 / C I B Input Bias Current ±5 ±5 ±7 ±5 V CM Input Votage Range ±.4 ±. ±.4 ±. V CMRR Common Mode Rejection Ratio V CM = ±.4V 7 4 db PSRR Power Suppy Rejection Ratio V S = ±4V to ±8V 4 db A VOL Large-Signa Votage Gain R L k, V OUT = ±V R L k, V OUT = ±V V OUT Maximum Output Votage Swing R L k ±.5 ±. ± ±. V SR Sew Rate R L k (Notes, 7) V/μs I S Suppy Current per Ampifi er ma V/ V/ 5

6 LT4/ ELECTRICAL CHARACTERISTICS Note : Stresses beyond those isted under Absoute Maximum Ratings may cause permanent damage to the device. Exposure to any Absoute Maximum Rating condition for extended periods may affect device reiabiity and ifetime. Note : Typica parameters are defi ned as the % yied of parameter distributions of individua ampifi ers; i.e., out of s (or LT4s) typicay 4 op amps (or ) wi be better than the indicated specification. Note : This parameter is % tested for each individua ampifi er. Note 4: This parameter is sampe tested ony. Note 5: This parameter is not % tested. Note : The inputs are protected by back-to-back diodes. Current imiting resistors are not used in order to achieve ow noise. If differentia input votage exceeds ±.4V, the input current shoud be imited to 5mA. Note 7: Sew rate is measured in A V = ; input signa is ±7.5V, output measured at ±.5V. Note 8:.Hz to Hz noise can be inferred from the Hz noise votage density test. See the test circuit and frequency response curve for.hz to Hz tester in the Appications Information section of the LT7 or LT8 data sheets. Note 9: This parameter is guaranteed but not tested. Note : The LT4C/C and LT4AC/AC are guaranteed to meet specifi ed performance from C to 7 C and are designed, characterized and expected to meet these extended temperature imits, but are not tested at 4 C and 85 C. The LT4AI and LT4I are guaranteed to meet the extended temperature imits. TYPICAL PERFORMANCE CHARACTERISTICS VOLTAGE NOISE (4nV/DIV).Hz to Hz Votage Noise.Hz to Hz Votage Noise Votage Noise vs Frequency 4 8 TIME (SECONDS) 4/5 G VOLTAGE NOISE (4nV/DIV) 4 8 TIME (SECONDS) 4/5 G RMS VOLTAGE NOISE DENSITY (nv/ Hz) T A = 5 C MAXIMUM TYPICAL /f CORNER.Hz.. 4/5 G RMS CURRENT NOISE DENSITY (pa/ Hz).... Current Noise vs Frequency /f CORNER Hz T A = 5 C MAXIMUM TYPICAL. k k 4 G4 INPUT BIAS OR OFFSET CURRENT () Input Bias or Offset Current vs Temperature 75 LT4M/M LT4AM/AM TEMPERATURE ( C) 4/5 G5 SHORT-CIRCUIT CURRENT (ma) SINKING SOURCING Output Short-Circuit Current vs Time 5 C 55 C 5 C 5 C 5 C 55 C 5 4 TIME FROM OUTPUT SHORT TO GND (UTES) LT4 G

7 TYPICAL PERFORMANCE CHARACTERISTICS LT4/ INPUT BIAS CURRENT () Input Bias Current Over the Common Mode Range T A = 5 C DEVICE WITH POSITIVE INPUT CURRENT DEVICE WITH NEGATIVE INPUT CURRENT COMMON MODE REJECTION RATIO (db) Common Mode Rejection Ratio vs Frequency T A = 5 C V CM = ±V POWER SUPPLY REJECTION RATIO (db) Power Suppy Rejection Ratio vs Frequency PSRR PSRR T A = 5 C COMMON MODE INPUT VOLTAGE (V) 4/5 G7 k k k M M 4/5 G /5 G9 VOLTAGE GAIN (db) 8 4. Votage Gain vs Frequency Votage Gain vs Temperature Gain, Phase Shift vs Frequency T A = 5 C k M M 4/5 G VOLTAGE GAIN (V/) R L= k V S = ± 5V V OUT = ± V R L= k LT4AM/AM LT4M/M LT4AM/AM LT4M/M TEMPERATURE ( C) 4/5 G VOLTAEG GAIN (db) 5 4. GAIN Ø T A = 5 C C L = pf FREQUENCY (MHz) 4/5 G PHASE SHIFT (DEGREES) PERCENT OF UNITS 4 Input Offset Votage Drift Distribution N8 S8 9 J8 9 UNITS TESTED OFFSET VOLTAGE () Offset Votage Drift with Temperature of Representative Units SUPPLY CURRENT PER AMPLIFIER (ma) Suppy Current vs Suppy Votage 5 C 5 C 55 C INPUT OFFSET VOLTAGE DRIFT (/ C) 4/5 G TEMPERATURE ( C) 4/5 G4 ±5 ± ±5 ± SUPPLY VOLTAGE (V) 4/5 G5 7

LT4/ TYPICAL PERFORMANCE CHARACTERISTICS 5mV 5mV Sma-Signa Transient Response A VCL = OR ±5V C L = 5pF 4/5 G mv mv Large-Signa Transient Response A VCL = 4/5 G7 V.8

4 8 4 4 8 I SINK I SOURCE OUTPUT CURRENT (ma) 4/5

8 LT4/ TYPICAL PERFORMANCE CHARACTERISTICS 5mV 5mV Sma-Signa Transient Response A VCL = OR ±5V C L = 5pF 4/5 G mv mv Large-Signa Transient Response A VCL = 4/5 G7 V.8 OUTPUT VOLTAGE SWING (V) Output Votage Swing vs Load Current V S = ±V TO ±8V 5 C 55 C 5 C 5 C 5 C 55 C V I SINK I SOURCE OUTPUT CURRENT (ma) 4/5 G8 COMMON MODE LIMIT (V) REFERRED TO POWER SUPPLY V.5 V Common Mode Limit vs Temperature Channe Separation vs Frequency Warm-Up Drift V = V TO 8V V = V TO 8V 4 TEMPERATURE ( C) 4/5 G9 CHANNEL SEPARATION (db) R L = k V OUT = 7V P-P T A = 5 C LIMITED BY THERMAL INTERACTION LIMITED BY PIN TO PIN CAPACITANCE k k k M M 4/5 G CHANGE IN OFFSET VOLTAGE () 8 4 T A = 5 C SO PACKAGE N, J PACKAGES 4 5 TIME AFTER POWER ON (UTES) 4/5 G 8

9 TYPICAL PERFORMANCE CHARACTERISTICS TOTAL HARMONIC DISTORTION NOISE (%)... Tota Harmonic Distortion and Noise vs Frequency for Noninverting Gain Z L = k/5pf V O = V P-P A V =,, MEASUREMENT BANDWIDTH = Hz TO 8kHz A V = A V = A V =. k k k 4/5 G TOTAL HARMONIC DISTORTION NOISE (%)... Tota Harmonic Distortion and Noise vs Frequency for Inverting Gain Z L = k/5pf V O = Vp-p A V =,, MEASUREMENT BANDWIDTH = Hz TO 8kHz A V = A V = A V =. k k k 4/5 G TOTAL HARMONIC DISTORTION NOISE (%)... LT4/ Tota Harmonic Distortion and Noise vs Frequency for Competitive Devices Z L = k/5pf V O = Vp-p A V = MEASUREMENT BANDWIDTH = Hz TO 8kHz OP7 OP7 LT4. k k k 4/5 G4 TOTAL HARMONIC DISTORTION NOISE (%). Tota Harmonic Distortion and Noise vs Output Ampitude for Noninverting Gain.. Z L = k/5pf f O = khz A V =,, MEASUREMENT BANDWIDTH = Hz TO khz A V = A V = A V =.. OUTPUT SWING (V P-P ) 4/5 G5 TOTAL HARMONIC DISTORTION NOISE (%). Tota Harmonic Distortion and Noise vs Output Ampitude for Inverting Gain.. Z L = k/5pf f O = khz A V =,, MEASUREMENT BANDWIDTH = Hz TO khz A V = A V = A V =.. OUTPUT SWING (Vp-p) 4/5 G INTERMODULATION DISTORTION (IMD)(%).. Intermoduation Distortion (CCIF Method)* vs Frequency LT4 and OP7 Z L = k/5pf f (IM) = khz f O =.5kHz V O = Vp-p A V = MEASUREMENT BANDWIDTH = Hz TO 8kHz OP7 LT4. k k k 4/5 G7 9

10 LT4/ APPLICATIONS INFORMATION The LT4 may be inserted directy into OP-7 sockets. The pugs into OP-47 sockets. Of course, a standard dua and quad bipoar op amps can aso be repaced by these devices. Matching Specifi cations In many appications the performance of a system depends on the matching between two op amps, rather than the individua characteristics of the two devices. The three op amp instrumentation ampifier configuration shown in this data sheet is an exampe. Matching characteristics are not % tested on the LT4/. Some specifi cations are guaranteed by definition. For exampe, 7 maximum offset votage impies that mismatch cannot be more than 4. db (=.5/V) CMRR means that worst case CMRR match is db (5/V). However, Tabe can be used to estimate the expected matching performance between the two sides of the LT4, and between ampifi ers A and D, and between ampifiers B and C of the. Offset Votage and Drift Thermocoupe effects, caused by temperature gradients across dissimiar metas at the contacts to the input terminas, can exceed the inherent drift of the ampifier uness proper care is exercised. Air currents shoud be minimized, package eads shoud be short, the two input eads shoud be cose together and maintained at the same temperature. The circuit shown in Figure to measure offset votage is aso used as the burn-in configuration for the LT4/, with the suppy votages increased to ±V. 5k* Ω* 5k* 5V 5V V OUT V OUT = V OS *RESISTORS MUST HAVE LOW THERMOELECTRIC POTENTIAL 4/5 F Figure. Test Circuit for Offset Votage and Offset Votage Drift with Temperature Tabe. Expected Match LT4AC/AM AC/AM LT4C/M C/M PARAMETER 5% YIELD 98% YIELD 5% YIELD 98% YIELD UNITS V OS Match, ΔV OS LT Temperature Coefficient Match / C Average Noninverting I B Match of Noninverting I B 7 8 CMRR Match 5 db PSRR Match db

11 LT4/ APPLICATIONS INFORMATION High Speed Operation When the feedback around the op amp is resistive (R F ), a poe wi be created with R F, the source resistance and capacitance (R S, C S ), and the ampifi er input capacitance (C IN pf). In ow cosed oop gain configurations and with R S and R F in the kiohm range, this poe can create excess phase shift and even osciation. A sma capacitor (C F ) in parae with R F eiminates this probem (see Figure ). With R S (C S C IN ) = R F C F, the effect of the feedback poe is competey removed. R S C S Figure. High Speed Operation Unity Gain Buffer Appications When R F Ω and the input is driven with a fast, arge signa puse (>V), the output waveform wi ook as shown in Figure. C F R F C IN OUTPUT 4/5 F During the fast feedthrough-ike portion of the output, the input protection diodes effectivey short the output to the input and a current, imited ony by the output short circuit protection, wi be drawn by the signa generator. With R F 5Ω, the output is capabe of handing the current requirements (I L ma at V) and the ampifi er stays in its active mode and a smooth transition wi occur. Noise Testing Each individua ampifier is tested to 4.nV/ Hz votage noise; i.e., for the LT4 two tests, for the four tests are performed. Noise testing for competing mutipe op amps, if done at a, may be sampe tested or tested using the circuit shown in Figure 4. e n OUT = (e ) (e nb ) (e nc ) (e nd ) If the were tested this way, the noise imit woud be 4 (4.nV/ Hz) = 8.4nV/ Hz. But is this an effective screen? What if three of the four ampifiers are at a typica.7nv/ Hz, and the fourth one was contaminated and has.9nv/ Hz noise? RMS Sum = (.7) (.7) (.7) (.9) = 8.nV/ Hz This passes an 8.4nV/ Hz spec, yet one of the ampifiers is 4% over the spec imit. Ceary, for proper noise measurement, the op amps have to be tested individuay. R F OUTPUT 4.5V/μs D C B A OUT 4/5 F 4/5 F4 Figure. Unity-Gain Buffer Appications Figure 4. Competing Quad Op Amp Noise Test Method

12 LT4/ PERFORMANCE COMPARISON Tabe summarizes the performance of the LT4/ compared to the ow cost grades of aternate approaches. The comparison shows how the specs of the LT4/ not ony stand up to the industry standard OP-7, but in most cases are superior. Normay dua and quad performance is degraded when compared to singes, for the LT4/ this is not the case. Tabe. Guaranteed Performance,, T A = 5 C, Low Cost Devices PARAMETER/UNITS Votage Noise, khz 4. % Tested Sew Rate.7 % Tested Gain Bandwidth Product 8. % Tested Offset Votage Offset Current LT4 LT4 LT4CN8 CN OP-7 GP OP-7 GP OP-47 GP UNITS Sampe Tested.7 Not Tested 5. Not Tested 75 No Limit 5. Sampe Tested nv/ Hz.7.4 V/μs No Limit No Limit Bias Current 8 Suppy Current/Amp ma Votage Gain, R L = k V/ Common Mode Rejection Ratio 9 db Power Suppy Rejection Ratio db SO-8 Package Yes LT4 Yes No 5 MHz TYPICAL APPLICATIONS Gain Ampifi er with.% Accuracy, DC to Hz Gain Error vs Frequency Cosed-Loop Gain = 5Ω % INPUT 4k % 5k 5% 5V / LT4 5V (S-8) 8 (N8) k TRIM OUTPUT RNC FILM RESISTORS THE HIGH GAIN AND WIDE BANDWIDTH OF THE LT4/, IS USEFUL IN LOW FREQUENCY HIGH CLOSED-LOOP GAIN AMPLIFIER APPLICATIONS. A TYPICAL PRECISION OP AMP MAY HAVE AN OPEN-LOOP GAIN OF ONE MILLION WITH 5kHz BANDWIDTH. AS THE GAIN ERROR PLOT SHOWS, THIS DEVICE IS CAPABLE OF.% AMPLIFYING ACCURACY UP TO.Hz ONLY. EVEN INSTRUMENTATION RANGE SIGNALS CAN VARY AT A FASTER RATE. THE LT4/ GAIN PRECISION BANDWIDTH PRODUCT IS 75 TIMES HIGHER, AS SHOWN. 4 7 (SO-8) (N8) 4/5 TA GAIN ERROR (PERCENT)... TYPICAL PRECISION OP AMP LT4/ CLOSED-LOOP GAIN GAIN ERROR = OPEN-LOOP GAIN.. 4/5 TA4

13 LT4/ SCHEMATIC DIAGRAM (/ LT4, /4 ) V Q7 μa 57μA μa Q8 Q Q9 Q Q8 k pf k.k.k Q7 Q8 5pF Q5 Q Q7 Ω OUTPUT NONINVERTING INPUT () V QA QB QB QA Q9 Q 7pF 9Ω 4Ω Q Ω INVERTING INPUT () Q Q Q Q5 V Q Q pf V Q Q4 Q9 μa μa μa Ω k Ω k 5Ω V 4/5 SS

14 LT4/ PACKAGE DESCRIPTION J8 Package 8-Lead CERDIP (Narrow. Inch, Hermetic) (Reference LTC DWG # 5-8-).45.8 (.4.5) FULL LEAD OPTION. BSC (7. BSC) CORNER LEADS OPTION (4 PLCS)..45 (.584.4) HALF LEAD OPTION.5 (.7).5 (.5) RAD TYP.45 (.87) MAX ( ). (5.8) MAX.5. (.8.54).8.8 (..457) 5 NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS.45.5 (.4.5).4. (..) OBSOLETE PACKAGE N8 Package 8-Lead PDIP (Narrow. Inch) (Reference LTC DWG # 5-8-5).4* (.) MAX (.54) BSC.5.75 J ±.5* (.477 ±.8) 4..5 ( ).45.5 (.4.5). ±.5 (. ±.7).8.5 (..8) ( ).5 (.5) TYP. (.54) BSC. (.48).8 ±. (.457 ±.7). (.58) N8 4 NOTE: INCHES. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED. INCH (.54mm)

15 PACKAGE DESCRIPTION S8 Package 8-Lead Pastic Sma Outine (Narrow.5 Inch) (Reference LTC DWG # 5-8-) LT4/.5 BSC.45 ± ( ) NOTE ± ( ).5.57 (.8.988) NOTE. ±.5 TYP RECOMMENDED SOLDER PAD LAYOUT 4.8. (..54).. (.54.58) 45 8 TYP.5.9 (.4.75).4. (..54)..5 (.4.7) NOTE: INCHES. DIMENSIONS IN (MILLIMETERS).4.9 (.55.48) TYP. DRAWING NOT TO SCALE. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED." (.5mm).5 (.7) BSC SO8 5

16 LT4/ PACKAGE DESCRIPTION J Package 4-Lead CERDIP (Narrow. Inch, Hermetic) (Reference LTC DWG # 5-8-).5 (.7).785 (9.99) MAX (.5) RAD TYP.. ( ). BSC (7. BSC) (5.8) MAX.5. (.8.54).8.8 (..457) (.4.5) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS.4. (..) OBSOLETE PACKAGE. (.54) BSC.5 (.75) J4 8 N Package 4-Lead PDIP (Narrow. Inch) (Reference LTC DWG # 5-8-5).77* (9.558) MAX ±.5* (.477 ±.8) ( ). ±.5 (. ±.7).45.5 (.4.5).8.5 (..8). (.58).5 (.5) TYP ( ). (.48).5 (.7) NOTE: INCHES. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED. INCH (.54mm). (.54) BSC.8 ±. (.457 ±.7) N4

17 PACKAGE DESCRIPTION SW Package -Lead Pastic Sma Outine (Wide. Inch) (Reference LTC DWG # 5-8-) LT4/. ±.5 TYP N.5 BSC.45 ± (.9.49) NOTE N.4.5 ±.5 NOTE (.7.4) N/ N/ RECOMMENDED SOLDER PAD LAYOUT (.7) RAD.9.99 ( ) NOTE (.54.77) 8 TYP.9.4 (..4).7.45 (.94.4).5.9. (.7) (.9.) NOTE BSC (.5.48) (.4.7) TYP NOTE: INCHES. DIMENSIONS IN (MILLIMETERS). DRAWING NOT TO SCALE. PIN IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS 4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED." (.5mm).4. (..5) S (WIDE) 5 Information furnished by Linear Technoogy Corporation is beieved to be accurate and reiabe. However, no responsibiity is assumed for its use. Linear Technoogy Corporation makes no representation that the interconnection of its circuits as described herein wi not infringe on existing patent rights. 7

18 LT4/ TYPICAL APPLICATION 5V Strain Gauge Signa Conditioner with Bridge Excitation LT9 5k.5V /4 k THE LT4/ IS CAPABLE OF PROVIDING EXCITATION CURRENT DIRECTLY TO BIAS THE 5Ω BRIDGE AT 5V WITH ONLY 5V ACROSS THE BRIDGE (AS OPPOSED TO THE USUAL V) TOTAL POWER DISSIPATION AND BRIDGE WARM-UP DRIFT IS REDUCED. THE BRIDGE OUTPUT SIGNAL IS HALVED, BUT THE LT4/ CAN AMPLIFY THE REDUCED SIGNAL ACCURATELY. 5V 5Ω BRIDGE REFERENCE OUTPUT 5V 5V /4 4 k k* k ZERO TRIM 5 *RNC FILM RESISTORS 4 /4 5V 7 5k GAIN TRIM μf k* V TO V OUTPUT 499Ω* 5V 4/5 TA5 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT7 Singe Low Noise, Precision Op Amp.5nV/ Hz khz Votage Noise LT8/LT8 Singe Low Noise, Precision Op Amps.85nV/ Hz Votage Noise LT/LT4 Dua/Quad Precision Picoamp Input 5pA Max I B LT Dua Low Noise JFET Op Amp 4.5nV/ Hz Votage Noise, fa/ Hz Current Noise LT/LT7 Decompensated LT4/ V/μs Sew Rate LT9 Dua Low Noise JFET Op Amp nv/ Hz Votage Noise, fa/ Hz Current Noise, pa Max I B LT79 Singe LT 4.nV/ Hz Votage Noise, fa/ Hz Current Noise LT79 Singe LT9 nv/ Hz Votage Noise, fa/ Hz Current Noise, pa Max I B 8 LT 59 REV C PRINTED IN USA Linear Technoogy Corporation McCarthy Bvd., Mipitas, CA (48) 4-9 FAX: (48) LINEAR TECHNOLOGY CORPORATION 99

LT1124/LT1125 Dual/Quad Low Noise, High Speed Precision Op Amps

LT1124/LT1125 Dual/Quad Low Noise, High Speed Precision Op Amps Dual/Quad Low Noise, High Speed Precision Op Amps % Tested Low Voltage Noise:.7nV/ Hz Typ 4.nV/ Hz Max Slew Rate: 4.5V/µs Typ Gain Bandwidth Product:.5MHz Typ Offset Voltage, Prime Grade: 7µV Max Low Grade: