DESCRIPTION FEATURES TYPICAL APPLICATION. LT1097 Low Cost, Low Power Precision Op Amp APPLICATIONS

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Low Cost, Low Power Precision Op Amp

FEATURES DESCRIPTION U

■ 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, 2.2pAp-p

■ CMRR 115dB Min

■ Voltage Gain 117dB Min

■ PSRR 114dB Min

■ Guaranteed Operation on Two NiCad Batteries

APPLICATION U S

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

LT1001 with Improved Price/Performance

■ High Impedance Difference Amplifiers

■ Logarithmic Amplifiers (Wide Dynamic Range)

■ Thermocouple Amplifiers

■ Precision Instrumentation

■ Active Filters (with Small Capacitors)

TYPICAL APPLICATION U

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

LT^®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.

+

9V

OUT = 1.1V TO 8.0V AS 1.8k ≤ R2 ≤ 135k

LT1097•TA01

4 2

3 7

6

R1 20k

R2 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

50

40

30

20

10

0

V_S = ±15V T_A = 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

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ABSOLUTE MAXIMUM RATINGS W W W U

PACKAGE/ORDER IN FORMATION U W U

ORDER PART NUMBER

LT1097CN8 Supply Voltage ...±20V Differential Input Current (Note 1) ...±10mA Input Voltage ...±20V Output Short Circuit Duration ... Indefinite

1 2 3 4

8 7 6 5 TOP VIEW V_OS TRIM

–IN +IN V^–

V_OS TRIM V⁺ OUT OVER COMP N8 PACKAGE

8-LEAD PLASTIC DIP

1 2 3 4

8 7 6 5 TOP VIEW

S8 PACKAGE 8-LEAD PLASTIC SO V_OS TRIM

–IN +IN V^–

V_OS TRIM V⁺ OUT OVER COMP

ORDER PART NUMBER

LT1097S8

ELECTRICAL CHARACTERISTICS

^V^S⁼^±^{15V, V}^CM^{= 0V, T}^A^{= 25}^°C, unless otherwise noted.

LT1097CN8 LT1097S8

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

V_OS Input Offset Voltage 10 50 10 60 µV

∆V_OS Long Term Input Offset 0.3 0.3 µV/Mo

∆TIME Voltage Stability

I_OS Input Offset Current 40 250 60 350 pA

I_B Input Bias Current ±40 ±250 ±50 ±350 pA

en Input Noise Voltage 0.1Hz to 10Hz 0.5 0.5 µVp-p

Input Noise Voltage Density fO = 10Hz 16 16 nV/√Hz

f_O = 1000Hz 14 14 nV/√Hz

i_n Input Noise Current 0.1Hz to 10Hz 2.2 2.4 pAp-p

Input Noise Current Density f_O = 10Hz 0.03 0.035 pA/√Hz

fO = 1000Hz 0.008 0.008 pA/√Hz

Input Resistance (Note 2)

Differential Mode 30 80 25 70 MΩ

Common Mode 10¹² 8•10¹¹ Ω

Input Voltage Range ±13.5 ±14.3 ±13.5 ±14.3 V

CMRR Common Mode Rejection Ratio V_CM = ±13.5V 115 130 115 130 dB

PSRR Power Supply Rejection Ratio VS = ±1.2V to ±20V 114 130 114 130 dB

AVOL Large Signal Voltage Gain VO = ±12V, RL = 10k 700 2500 700 2500 V/mV

V_O = ±10V, R_L = 2k 250 1000 250 1000 V/mV

V_OUT Output Voltage Swing R_L = 10k ±13 ±13.8 ±13 ±13.8 V

RL = 2k ±11.5 ±13 ±11.5 ±13 V

SR Slew Rate 0.1 0.2 0.1 0.2 V/µs

GBW Gain Bandwidth Product 700 700 kHz

I_S Supply Current 350 560 350 560 µA

Offset Adjustment Range R_POT = 10k, Wiper to V⁺ ±600 ±600 µV

Minimum Supply Voltage (Note 3) ±1.2 — ±1.2 — V

Operating Temperature Range ...–40°C to 85°C Storage Temperature Range ...–65°C to 150°C Lead Temperature (Soldering, 10 sec)... 300°C

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ELECTRICAL CHARACTERISTICS

^V^S⁼^±^{15V, V}^CM^{= 0V, 0}^°^C^≤^T^A^≤⁷⁰^°C, unless otherwise noted.

LT1097CN8 LT1097S8

VOS Input Offset Voltage ● 20 100 20 130 µV

Average Temperature Coefficient of (Note 4) ● 0.2 1 0.2 1.4 µV/°C

Input Offset Voltage

I_OS Input Offset Current ● 60 430 75 570 pA

Average Temperature Coefficient of (Note 4) ● 0.4 4 0.5 5 pA/°C

Input Offset Current

I_B Input Bias Current ● ±60 ±430 ±75 ±570 pA

Average Temperature Coefficient of (Note 4) ● 0.4 4 0.5 5 pA/°C

Input Bias Current

A_VOL Large Signal Voltage Gain V_OUT = ±12V, RL ≥ 10k ^● 450 2000 450 2000 V/mV

V_OUT = ±10V, R_L≥ 2k ● 180 800 180 800 V/mV

CMRR Common Mode Rejection Ratio V_CM = ±13.5V ● 112 128 112 128 dB

PSRR Power Supply Rejection Ratio V_S = ±1.3V to ±20V ● 111 128 111 128 dB

Input Voltage Range ● ±13.5 ±14.2 ±13.5 ±14.2 V

V_OUT Output Voltage Swing R_L = 10k ● ±13 ±13.7 ±13 ±13.7 V

I_S Supply Current ● 380 700 380 700 µA

ELECTRICAL CHARACTERISTICS

^V^S⁼^±^{15V, V}^CM^{= 0V, –40}^°^C^≤^T^A^≤⁸⁵^°C, unless otherwise noted. (Note 5)

LT1097CN8 LT1097S8

V_OS Input Offset Voltage ● 25 130 30 170 µV

Average Temperature Coefficient of ● 0.3 1.2 0.3 1.6 µV/°C

Input Offset Voltage

IOS Input Offset Current ● 70 600 85 750 pA

Average Temperature Coefficient of ● 0.5 5 0.6 6 pA/°C

Input Offset Current

I_B Input Bias Current ● ±70 ±600 ±85 ±750 pA

Average Temperature Coefficient of ● 0.5 5 0.6 6 pA/°C

Input Bias Current

AVOL Large Signal Voltage Gain VOUT = ±12V, RL ≥ 10k ^● 300 1700 300 1700 V/mV

V_OUT = ±10V, R_L≥ 2k ● 700 700 V/mV

CMRR Common Mode Rejection Ratio V_CM = ±13.5V ● 108 127 108 127 dB

PSRR Power Supply Rejection Ratio V_S = ±1.5V to ±20V ● 108 127 108 127 dB

Input Voltage Range ● ±13.5 ±14 ±13.5 ±14 V

V_OUT Output Voltage Swing R_L = 10k ● ±13 ±13.6 ±13 ±13.6 V

I_S Supply Current ● 400 800 400 800 µA

The ● denotes specifications which apply over the full operating temperature range.

Note 1: Differential input voltages greater than 1V will cause excessive current to flow through the input protection diodes unless limiting resistance is used.

Note 2: This parameter is guaranteed by design and is not tested.

Note 3: Power supply rejection ratio is measured at the minimum supply voltage.

Note 4: This parameter is not 100% tested.

Note 5: The LT1097 is designed, characterized and expected to meet these extended temperature limits, but is not tested at –40°C and 85°C.

Guaranteed I grade parts are available; consult factory.

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TYPICAL PERFORMANCE CHARACTERISTICS W U

Distribution to Offset Voltage Drift with Temperature

Input Bias Current vs Temperature

Minimum Supply Voltage, Common Mode Range and Voltage Swing at V_MIN

Warm-Up Drift

Input Bias Current Over Common Mode Range

OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C) –1.5 –1.2 –0.9 –0.6 –0.3 0 0.3 0.6 0.9 1.2 1.5

PERCENT OF UNITS

LT1097 • G02

50

40

30

20

10

0

VS = ±15V 240 UNITS TESTED IN N8 PACKAGES FROM SIX RUNS

TIME AFTER POWER ON (MINUTES)

0 1 2 3 4 5

CHANGE IN OFFSET VOLTAGE (µV)

1097 • G05

5

4

3

2

1

0

VS = ±15V TA = 25°C

PLASTIC-IN-LINE PACKAGE PLASTIC (N) OR SO (S) TEMPERATURE (°C)

–50 –25 0 25 50 75 100

INPUT BIAS CURRENT (pA)

1097 • G03

200

100

0

–100

–200

–300

UNDERCANCELLED UNIT

OVERCANCELLED UNIT

TEMPERATURE (°C)

–40 –10 20 50 80 110

COMMON MODE RANGE OR OUTPUT SWING (V)

1097 • G04

MINIMUM SUPPLY VOLTAGE, VMIN (V) V⁺

V⁺ –0.2 V⁺ –0.4 V⁺ –0.6 V⁺ –0.8

V^– +0.8 V^– +0.6 V^– +0.4 V^– +0.2 V^–

±1.4

±1.2

±1.0 CM RANGE ±0.8

CM RANGE

SWING

R_L = 10k SWING

COMMON MODE INPUT VOLTAGE

–15 –10 –5 0 5 10 15

INPUT BIAS CURRENT (pA)

1097 • G06

120

80

40

0

–40

–80

–120

VS = ±15V TA = 25°C

R_{IN CM} = 10¹²Ω DEVICE WITH POSITIVE INPUT CURRENT

DEVICE WITH NEGATIVE INPUT CURRENT

VCM I_B

+ –

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5

Output Short Circuit Current vs Time

TYPICAL PERFORMANCE CHARACTERISTICS W U

0.1Hz to 10Hz Noise 0.01Hz to 10Hz Noise

Noise Spectrum

TIME (SECONDS)

0 2 4 6 8 10

NOISE VOLTAGE (0.4µV/DIV)

1097 • G08

VS = ±1.2V TO ±20V TA = 25°C

TIME FROM OUTPUT SHORT (MINUTES)

0 1 2 3

SHORT CIRCUIT CURRENT (mA) SINKINGSOURCING

1097 • G07

20 15 10 5 0 –5 –10 –15 –20

V_S = ±15V T_A = 25°C

TIME (SECONDS)

0 20 40 60 80 100

NOISE VOLTAGE (0.4µV/DIV) 0.4µV

1097 • G09

VS = ±1.2V TO ±20V TA = 25°C

FREQUENCY (Hz) 1

1 10 100 1000

10 100 1000

1097 • G10

VOLTAGE NOISE DENSITY (nV√Hz) CURRENT NOISE DENSITY (fA√Hz)

TA = 25°C VS = ±1.2V TO ±20V

VOLTAGE NOISE 1/f CORNER

2.5Hz

1/f CORNER 140Hz CURRENT NOISE

OUTPUT VOLTAGE (V)

–15 –10 –5 0 5 10 15

CHANGE IN OFFSET VOLTAGE (µV)

1097 • G11

–30

–20

–10

0

10

20

30

Vs = ±15 V TA = 25°C

RL = 10k

RL = 2k RL = 2k

Voltage Gain

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6

FREQUENCY (Hz)

0.01 0.1 1 10 100 1k 10k 100k 1M 10M

VOLTAGE GAIN (dB)

1097 • G12

140 120 100 80 60 40 20 0 –20

VS = ±15V TA = 25°C

FREQUENCY (MHz) 0.01

GAIN (dB)

40

30

20

10

0

–10

PHASE SHIFT (DEGREES)

100

120

140

160

180

200

0.1 1 10

1097 • G13

V_S = ±15V T_A = 25°C

PHASE

GAIN

PHASE MARGIN = 70°C

FREQUENCY (Hz)

1 10 100 1k 10k 100k 1M

COMMON MODE REJCTION RATIO (dB)

1097 • G14

140

120

100

80

60

40

20

0

V_S = ±15V T_A = 25°C

FREQUENCY (Hz)

0.1 1 10 100 1k 10k 100k 1M

POWER SUPPLY REJECTION RATIO (dB)

1097 • G15

140

120

100

80

60

40

20

V_S = ±15V T_A = 25°C

POSITIVE SUPPLY

NEGATIVE SUPPLY

OVERCOMPENSATION CAPACITOR (pF)

SLEW RATE (V/µs)

1 100 1000 10000

1097 • G16

10 1

0.1

0.01

0.001

GAIN BANDWIDTH PRODUCT (kHz)

1000

100

10

1 V_S = ±15V

T_A = 25°C

SLEW GBW

Voltage Gain vs Frequency

Gain, Phase Shift vs Frequency

Common Mode Rejection vs Frequency

Power Supply Rejection vs Frequency

Slew Rate, Gain Bandwidth Product vs Overcompensation Capacitor

TYPICAL PERFORMANCE CHARACTERISTICS W U

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CAPACITIVE LOAD (pF) 10

OVERSHOOT (%)

70

60

50

40

30

20

10

0

100 1000 10,000

1097 G19

TA = 25°C VS = ±15V

CS: PIN 5 TO GROUND

AV = 1 CS = 0

AV = 1 CS = 200pF

AV = 10 CS = 0 A_V = 1, C_LOAD = 100pF, 5µs/DIV

20mV/DIV

1097 G17

A_V = 1, 20µs/DIV

2V/DIV

1097 G18

Small Signal Transient Response Large Signal Transient Response

Capacitive Load Handling

TYPICAL PERFORMANCE CHARACTERISTICS W U

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8

Q27 1.5k 2.5k

30pF 1

TRIM

800Ω

30k 8

TRIM 5 OVER COMP

6 OUT 800Ω

30k 1.3k

35µA

20µA

80µA

2 –IN

3 +IN

15µA

S S S

Q3 Q1

Q9

Q10 Q2

Q5 Q6

S

80µA

5µA 5µA

Q11

Q24

Q12 Q21

Q22

Q20 Q23

Q4

Q7 Q8

Q13

1.5k 50k

3k

J1

Q16

Q17 Q18

Q15 3.7k

3.7k 3.7k 16k

Q14

Q19

1.5k

40Ω

40Ω 1.5k

Q29 Q33

Q28

Q31 Q30

Q26

40Ω 330Ω

Q1–Q4 ARE SUPERGAIN TRANSISTORS 1097 BD

Q32 100Ω

7 V⁺

Q25

4 V^–

SCHEMATIC DIAGRAM W W

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9

15V

–15V

OUT

LT1097•F01

4 3

2 7

6

50k 50k

50k

50k +IN –IN

+ –

LT1097

V–

OUT V+

LT1097•F02

4 5

CS 1

3 2

10k POT

8 7 6

+ –

LT1097

Frequency Compensation and Optional Offset Nulling

±27V Common Mode Range Difference Amplifier

APPLICATION S INFORMATION U U W U

Guaranteed Perfomance, V_S = ±15V, T_A = 25°C

PARAMETER LT1097CN8 OP-77GP AD707JN OP-177GP OP-97FP UNITS

Error Terms

V_OS Max 50 100 90 60 75 µV

I_OS Max•25k 6 70 50 70 4 µV

Gain Min, 10V Out 14 5 3 5 50 µV

CMRR, Min, ±25V In 22 20 13 22 39 µV

PSRR, Min, V_S = ±15V ±10% 6 9 9 9 9 µV

Sum of All Error Terms 98 204 165 166 177 µV

0.1Hz to 10Hz Noise

Voltage Noise 0.5 0.38 0.23 0.38 0.5 µVp-p Typ

Current Noise•50k 0.11 0.75 0.7 0.75 0.1 µVp-p Typ

Resistor Noise 0.55 0.55 0.55 0.55 0.55 µVp-p Typ

RMS sum 0.75 1 0.92 1 0.75 µVp-p

Drift with Temp

TCV_OS Max 1 1.2 1 1.2 2 µV/°C

TCI_OSMax•25k 0.1 2.1 1 2.1 0.2 µV/°C

Sum of Drift Terms 1.1 3.3 2 3.3 2.2 µV/°C

Supply Current Max 0.56 2 3 2 0.6 mA

The LT1097 is pin compatible to and directly replaces such precision op amps as the OP-07, OP-77, AD707, OP-97, OP- 177, 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. The 50k input resistance is selected to be large enough compared to input signal source resistance. Simultaneously, the 50k resistors should not dominate the precision and noise error budget. Assuming perfect matching between the four resistors, the following table summarizes the input

referred performance obtained using the LT1097 and other popular, low cost precision op amps.

Input offset voltage can be adjusted over a ±600µV range with a 10k potentiometer.

The LT1097 is internally compensated for unity gain stability. As shown on the Capacitive Load Handling plot, the LT1097 is stable with any capacitive load. However, the overcompensation capacitor, C_S, can be used to re- duce overshoot with heavy capacitive loads, to narrow noise bandwidth or to stabilize circuits with gain in the feedback loop.

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APPLICATION S INFORMATION U U W U

OUT

LT1097•F03

5

0.01µF IN 3

2

6 50pF

10k

5k +

–

LT1097

15V

–15V

VO

VO = 1000VOS

*RESISTORS MUST HAVE LOW THERMOELECTRIC POTENTIAL LT1097•F04

4 3

2 7

6

50k*

100Ω*

50k*

+ –

LT1097

Pulse Response of Feedforward Compensation

Test Circuit for Offset Voltage and its Drift with Temperature Follower Feedforward

Compensation

5µs/DIV

5V/DIV

1097 G20

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. In the voltage follower configuration, when the input is driven by a fast, large signal pulse (>1V), the input

protection diodes effectively short the output to the input during slewing, and a current, limited only by the output short circuit protection will flow through the diodes.

The use of a feedback resistor, as shown in the voltage follower feedforward diagram, is recommended because this resistor keeps the current below the short circuit limit, resulting in faster recovery and settling of the output.

–5V

OUT

2N3904 620k

LT1097•TA02

4 3 2

1 7 5V

6 330k 1k

100k 10k

10k –IN +IN

+ –

LT1097

100k

Low Power Comparator with <10µV Hysteresis

TYPICAL APPLICATIO U

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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

PACKAGE DESCRIPTION U

Dimensions in inches (millimeters) unless otherwise noted.

N8 1197

0.100 ± 0.010 (2.540 ± 0.254) 0.065

(1.651) TYP

0.045 – 0.065 (1.143 – 1.651)

0.130 ± 0.005 (3.302 ± 0.127)

0.020 (0.508) 0.018 ± 0.003 MIN (0.457 ± 0.076)

0.125 (3.175)

MIN

1 2 3 4

8 7 6 5

0.255 ± 0.015*

(6.477 ± 0.381)

0.400*

(10.160) MAX

0.009 – 0.015 (0.229 – 0.381)

0.300 – 0.325 (7.620 – 8.255)

0.325+0.035 –0.015 +0.889 –0.381 8.255

( )

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

1 2 3 4

0.150 – 0.157**

(3.810 – 3.988)

8 7 6 5

0.189 – 0.197*

(4.801 – 5.004)

0.228 – 0.244 (5.791 – 6.197)

0.016 – 0.050 0.406 – 1.270 0.010 – 0.020 (0.254 – 0.508)× 45°

0°– 8° TYP 0.008 – 0.010

(0.203 – 0.254)

SO8 0996

0.053 – 0.069 (1.346 – 1.752)

0.014 – 0.019 (0.355 – 0.483)

0.004 – 0.010 (0.101 – 0.254)

0.050 (1.270) DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH TYP

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

*

**

N8 Package 8-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610)

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1097fas sn1097 LT/TP 0398 2K REV A • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 1989

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417 ^● (408) 432-1900 FAX: (408) 434-0507 ^●TELEX: 499-3977 ^●www.linear-tech.com

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LT1077 Single Micropower Low V_OS Op Amp 60µV VOS Max, 68µA Supply Current, 230kHz GBW, Optimized for 5V Supplies

–5V 1000pF 1k*

LT1097•TA03

4 5 3

2 7

6 9k*

15V

100k 5%

10k 90k 900k 9M

0.1V IN

10V 1V

100V

1000V

0.1V

10V 1V

100V 1000V

TO 1V FULL SCALE ANALOG DIGITAL CONVERTER

*RATIO MATCH ±0.01%

FN507 ALLEN BRADLEY DECADE VOLTAGE DIVIDER

THIS APPLICATION REQUIRES LOW BIAS CURRENT AND OFFSET VOLTAGE, LOW NOISE, AND LOW DRIFT WITH TIME AND TEMPERATURE.

+ –

LT1097

Input Amplifier for 4 1/2 Digit Voltmeter

TYPICAL APPLICATIO U

Over-The-Top is a trademark of Linear Technology Corporation.