LT1002 Dual, Matched Precision Operational Amplifier FEATURES DESCRIPTIO n The LT 1002 dual, matched precision operational ampli- Guaranteed low offset voltage fiers combine excellent individual amplifier performance LT1002A 60m V max with tight matching and temperature tracking between LT1002 100m V max n amplifiers. Guaranteed offset voltage match LT1002A 40m V max In the design, processing, and testing of the device, LT1002 80m V max particular attention has been paid to the optimization of the n Guaranteed low drift entire distribution of several key parameters and their LT1002A 0.9m V/ C max matching. Consequently, the specifications of even the LT1002 1.3m V/ C max low cost commercial grade (LT1002C) have been spec- n Guaranteed CMRR tacularly improved compared to presently available de- LT1002A 110dB min vices. LT1002 110dB min Essentially, the input offset voltage of all units is less than n Guaranteed channel separation 80m V, and matching between amplifiers is consistently LT1002A 132dB min beter than 60m V (see distribution plot below). Input bias LT1002 130dB min and offset currents, channel separation, common mode n Guaranteed matching characteristics and power suply rejections of the LT1002C are all speci- n Low noise 0.35m V P-P fied at levels which were previsouly attainable only on very U expensive, selected grades of other dual devices. Power APPLICATIO S dissipation is nearly halved compared to the most popular n Thermocouple Amplifiers precision duals, without adversely affecting noise or speed n Strain Gauge Amplifiers performance. A by-product of lower dissipation is de- n Low level signal processing creased warm-up drift. For even better performance in a n Medical instrumentation single precision op amp, refer to the LT1001 data sheet. A n Precision dual limit threshold detection bridge signal conditioning application is shown below. n Instrumentation amplifiers This circuit illustrates the requirement for both excellent , LTC and LT are registered trademarks of Linear Technology Corporation matching and individual amplifier specifications. TYPICAL APPLICATIO Strain Gauge Signal Conditioner with Bridge Excitation 15V Distribution of Offset Voltage Match 15V 8.2k 100W 5W 2k* 4 70 + REFERENCE OUT V = 15V S 2k 13 1/2 TO MONITORING 2N2219 T = 25C A LT1002 A/D CONVERTER LM329 60 4.99k* 3 287 UNITS TESTED IN4148 50 3 + 40 350W BRIDGE 6 0V TO 10V 10k LT1001 OUT 30 ZERO 2 301k* 1m F 340k* 20 10 1.1k* GAIN 10 IN4148 TRIM 1/2 2N2907 LT1002 6 0 11 2k + 100 80 60 40 20 0 20 40 60 80 100 100W INPUT OFFSET VOLTAGE MATCH (m V) 5W *RN60C FILM RESISTORS 1002 TA01 1002 TA02 15V 1002fb 1 NUMBER OF UNITS U ULT1002 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Supply Voltage (Note 7) ........................................ 22V TOP VIEW OFFSET ORDER VOLTAGE 1 14 V+ (A) Differential Input Voltage ...................................... 30V NULL (A) 2 13 OUT (A) NULL (A) PART NO. MAX Input Voltage Equal to Supply Voltage IN (A) 3 12 V (A) at 25 C A Output Short Circuit Duration ......................... Indefinite + +IN (A) 4 11 +IN (B) + B Operating Temperature Range V (B) 5 10 IN (B) LT1002ACN 60m V 6 9 NULL (B) LT1002AM/LT1002M (OBSOLETE) ..55 C to 125 C OUT (B) LT1002CN 100m V 7 8 NULL (B) V+ (B) LT1002AC/LT1002C ............................... 0 C to 70 C N PACKAGE Storage Temperature Range 14 PIN PLASTIC T = 125 C, q = 100 C/W All Grades ......................................... 65 C to 150 C JMAX JA NOTE: Device may be operated even if insertion Lead Temperature (Soldering, 10 sec.)................. 300 C is reversed this is due to inherent symmetry of pin locations of amplifiers A and B. (Note 7) LT1002AMJ 60m V LT1002MJ J PACKAGE 100m V 14 PIN HERMETIC LT1002ACJ 60m V T = 125 C, q = 100 C/W JMAX JA LT1002CJ 100m V OBSOLETE PACKAGE Consider the N Package for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. UW ELECTRICAL CHARACTERISTICS, I DIVIDUAL A PLIFIERS V = 15V, T = 25 C, unless otherwise noted S A LT1002AM/LT1002AC LT1002M/LT1002C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS V Input Offset Voltage (Note 2) 20 60 25 100 m V OS D V Long Term Input Offset Voltage OS Stability (Notes 3 and 4) 0.3 1.5 0.4 2.0 m V/month D Time I Input Offset Current 0.3 2.8 0.4 4.2 nA OS I Input Bias Current 0.6 3.0 0.7 4.5 nA B e Input Noise Voltage 0.1Hz to 10Hz (Note 3) 0.35 0.7 0.38 0.75 m V n p-p e Input Noise Voltage Density f = 10Hz (Note 6) 10.3 20.0 10.5 20.0 n O f = 1000Hz (Note 3) 9.6 11.5 9.8 12.0 nV Hz O A Large Signal Voltage Gain R 2kW , V = 12V 400 800 350 800 VOL L O V/mV R 1kW , V = 10V 250 500 220 500 L O CMRR Common Mode Rejection Ratio V = 13V 110 126 110 126 dB CM PSRR Power Supply Rejection Ratio V = 3V to 18V 108 123 105 123 dB S R Input Resistance Differential Mode (Note 5) 20 100 13 80 MW in Input Voltage Range 13 14 13 14 V V Maximum Output Voltage Swing R 2kW 13 14 13 14 V OUT L R 1kW 12 13.5 12 13.5 L SR Slew Rate R 2kW (Note 5) 0.1 0.25 0.1 0.25 V/m s L GBW Gain Bandwidth Product (Note 5) 0.4 0.8 0.4 0.8 MHz P Power Dissipation No load 46 75 48 85 d mW per amplifier No load, V = 3V 4 7 4 8 S 1002fb 2 U W U W U WW