Datasheet

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LT1097

Low Cost, Low Power

Precision Op Amp

FEATURES

DESCRIPTION

■

Offset Voltage 50µV Max

■

Offset Voltage Drift 1µV/°C Max

■

Bias Current 250pA Max

■

Offset Current 250pA Max

■

Bias and Offset Current Drift 4pA/°C Max

■

Supply Current 560µA Max

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0.1Hz to 10Hz Noise 0.5µVp-p, 2.2pAp-p

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CMRR 115dB Min

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Voltage Gain 117dB Min

■

PSRR 114dB Min

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Guaranteed Operation on Two NiCad Batteries

APPLICATIONS

■

Replaces OP-07/OP-77/OP-97/OP-177/AD707/

LT1001 with Improved Price/Performance

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High Impedance Difference Amplifiers

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Logarithmic Amplifiers (Wide Dynamic Range)

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Thermocouple Amplifiers

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Precision Instrumentation

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Active Filters (with Small Capacitors)

TYPICAL APPLICATION

, LTC and LT are registered trademarks of Linear Technology Corporation.

1097 achieves a new standard in combining low price

and outstanding precision performance.

On all operational amplifier data sheets, the specifications

listed on the front page are for highly selected, expensive

grades, while the specs for the low cost grades are buried

deep in the data sheet.

The LT1097 does not have any selected grades, the

outstanding specifications shown in the Features section

are for its only grade.

The design effort of the LT1097 concentrated on optimiz-

ing the performance of all precision specs—at only 350µA

of supply current. Typical values are 10µV offset voltage,

40pA bias and offset currents, 0.2µV/°C and 0.4pA/°C

drift. Common mode and power supply rejections, voltage

gain are typically in excess of 128dB.

All parameters that are important for precision, low power

op amps have been optimized. Consequently, using the

LT1097 error budget calculations in most applications is

unnecessary.

OUT = 1.1V TO 8.0V

AS 1.8k ≤ R2 ≤ 135k

LT1097•TA01

20k

1.018235V

2N3609

SATURATED

STANDARD

CELL #101

EPPLEY LABS

NEWPORT, R. I.

THE TYPICAL 40pA BIAS CURRENT OF THE LT1097

WILL DEGRADE THE STANDARD CELL BY ONLY

1ppm/YEAR. NOISE IS A FRACTION OF A ppm.

UNPROTECTED GATE MOSFET ISOLATES

STANDARD CELL ON POWER DOWN.

–

LT1097

INPUT OFFSET VOLTAGE (µV)

–50 –40 –30 –20 –10 0 10 20 30 40 50

PERCENT OF UNITS

LT1097 • G01

= ±15V

= 25°C

6,500 UNITS IN SO PACKAGE

6,680 UNITS IN

PLASTIC

DIP

13,180 UNITS

TESTED

Input Offset Voltage Distribution

Saturated Standard Cell Amplifier

Summary of content (12 pages)

PAGE 1
LT1097 Low Cost, Low Power Precision Op Amp U DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Offset Voltage 50µV Max Offset Voltage Drift 1µV/°C Max Bias Current 250pA Max Offset Current 250pA Max Bias and Offset Current Drift 4pA/°C Max Supply Current 560µA Max 0.1Hz to 10Hz Noise 0.5µVp-p, 2.
PAGE 2
LT1097 U W W W ABSOLUTE MAXIMUM RATINGS Supply Voltage ...................................................... ±20V Differential Input Current (Note 1) ...................... ±10mA Input Voltage ......................................................... ±20V Output Short Circuit Duration .......................... Indefinite Operating Temperature Range .................–40°C to 85°C Storage Temperature Range ..................–65°C to 150°C Lead Temperature (Soldering, 10 sec)..................
PAGE 3
LT1097 ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. LT1097S8 TYP MAX UNITS 100 20 130 µV 0.2 1 0.2 1.4 µV/°C ● 60 430 75 570 pA Average Temperature Coefficient of (Note 4) Input Offset Current ● 0.4 4 0.5 5 Input Bias Current ● ±60 ±430 ±75 ±570 Average Temperature Coefficient of (Note 4) Input Bias Current ● 0.4 4 0.
PAGE 4
LT1097 U W TYPICAL PERFORMANCE CHARACTERISTICS Distribution to Offset Voltage Drift with Temperature 50 VS = ±15V 240 UNITS TESTED IN N8 PACKAGES FROM SIX RUNS PERCENT OF UNITS 40 30 20 10 0 –1.5 –1.2 –0.9 –0.6 –0.3 0 0.3 0.6 0.9 1.2 1.
PAGE 5
LT1097 U W TYPICAL PERFORMANCE CHARACTERISTICS Output Short Circuit Current vs Time SHORT CIRCUIT CURRENT (mA) SINKING SOURCING 20 15 10 5 VS = ±15V TA = 25°C 0 –5 –10 –15 –20 0 1 2 TIME FROM OUTPUT SHORT (MINUTES) 3 1097 • G07 0.1Hz to 10Hz Noise 0.01Hz to 10Hz Noise 0 2 4 6 TIME (SECONDS) 8 VS = ±1.2V TO ±20V TA = 25°C 0.4µV NOISE VOLTAGE (0.4µV/DIV) NOISE VOLTAGE (0.4µV/DIV) VS = ±1.
PAGE 6
LT1097 U W TYPICAL PERFORMANCE CHARACTERISTICS Voltage Gain vs Frequency 140 VS = ±15V TA = 25°C 120 VOLTAGE GAIN (dB) 100 80 60 40 20 0 –20 0.01 0.1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 1097 • G12 Common Mode Rejection vs Frequency Gain, Phase Shift vs Frequency PHASE 120 GAIN (dB) GAIN 20 140 10 160 0 180 PHASE MARGIN = 70°C 0.1 1 FREQUENCY (MHz) 10 PHASE SHIFT (DEGREES) 30 –10 0.
PAGE 7
LT1097 U W TYPICAL PERFORMANCE CHARACTERISTICS Large Signal Transient Response 2V/DIV 20mV/DIV Small Signal Transient Response AV = 1, CLOAD = 100pF, 5µs/DIV 1097 G17 AV = 1, 20µs/DIV 1097 G18 Capacitive Load Handling 70 TA = 25°C VS = ±15V CS: PIN 5 TO GROUND 60 OVERSHOOT (%) 50 AV = 1 CS = 0 40 30 AV = 1 CS = 200pF 20 10 AV = 10 CS = 0 0 10 100 1000 CAPACITIVE LOAD (pF) 10,000 1097 G19 7
PAGE 8
LT1097 W W SCHEMATIC DIAGRAM TRIM 1 TRIM 8 V+ 5 OVER COMP 7 800Ω 800Ω 30k 30k 20µA 35µA 80µA 1.3k 30pF Q19 Q22 1.5k 2.5k 1.5k Q33 Q25 Q21 Q27 Q6 Q5 Q29 S Q8 Q24 Q4 40Ω Q7 – IN S S Q1 2 Q2 100Ω 3k Q13 S OUT 6 Q11 Q23 1.5k 40Ω Q3 Q20 50k Q28 J1 1.5k Q26 Q9 Q32 Q18 Q12 Q16 +IN Q10 Q17 3 3.7k 15µA 80µA Q30 5µA Q31 Q14 Q15 5µA 3.7k 3.
PAGE 9
LT1097 U U W U APPLICATIONS INFORMATION The LT1097 is pin compatible to and directly replaces such precision op amps as the OP-07, OP-77, AD707, OP-97, OP177, LM607 and LT1001 with improved price/performance. Compatibility includes externally nulling the offset voltage, as all of the above devices are trimmed with a potentiometer between Pin 1 and Pin 8 and the wiper tied to V+. The simple difference amplifier can be used to illustrate the all-around excellence of the LT1097.
PAGE 10
LT1097 U U W U APPLICATIONS INFORMATION The availability of the compensation terminal permits the use of feedforward frequency compensation to enhance slew rate. The voltage follower feedforward scheme bypasses the amplifier’s gain stages and slews at nearly 10V/µs. The inputs of the LT1097 are protected with back-to-back diodes.
PAGE 11
LT1097 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.400* (10.160) MAX 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 8.255 +0.889 –0.381 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) ) 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 (0.457 ± 0.076) N8 1197 0.100 ± 0.010 (2.
PAGE 12
LT1097 U TYPICAL APPLICATIO Input Amplifier for 4 1/2 Digit Voltmeter 0.1V 15V IN 2 0.1V 100k 5% 1V – 7 3 4 + 5 9M 10V 1V 6 LT1097 9k* 10V 1k* 1000V 100V –5V 1000pF 900k 100V *RATIO MATCH ±0.01% TO 1V FULL SCALE ANALOG DIGITAL CONVERTER 90k 1000V FN507 10k ALLEN BRADLEY DECADE VOLTAGE DIVIDER THIS APPLICATION REQUIRES LOW BIAS CURRENT AND OFFSET VOLTAGE, LOW NOISE, AND LOW DRIFT WITH TIME AND TEMPERATURE.