Datasheet

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LT1002

1002fb

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

Dual, Matched Precision

Operational Amplifier

Strain Gauge Signal Conditioner with Bridge Excitation

–

LT1001

2k*

8.2k

LM329

15V

1002 TA01

4.99k*

–15V

*RN60C FILM RESISTORS

15V

IN4148

350Ω BRIDGE

2N2219

REFERENCE OUT

TO MONITORING

A/D CONVERTER

IN4148

100Ω 5W

100Ω

10k

ZERO

1µF

340k*

0V TO 10V

OUT

301k*

1.1k*

2N2907

–

1/2

LT1002

1/2

LT1002

GAIN

TRIM

INPUT OFFSET VOLTAGE MATCH (µV)

–100

NUMBER OF UNITS

–80

1002 TA02

–20

100

–60 –40

20 60

= ±15V

= 25°C

287 UNITS TESTED

Distribution of Offset Voltage Match

■

Thermocouple Amplifiers

■

Strain Gauge Amplifiers

■

Low level signal processing

■

Medical instrumentation

■

Precision dual limit threshold detection

■

Instrumentation amplifiers

■

Guaranteed

low offset voltage

LT1002A 60µV max

LT1002 100µV max

■

Guaranteed

offset voltage match

LT1002A 40µV max

LT1002 80µV max

■

Guaranteed

low drift

LT1002A 0.9µV/°C max

LT1002 1.3µV/°C max

■

Guaranteed

CMRR

LT1002A 110dB min

LT1002 110dB min

■

Guaranteed

channel separation

LT1002A 132dB min

LT1002 130dB min

■

Guaranteed

matching characteristics

■

Low noise 0.35µV

P-P

The LT

1002 dual, matched precision operational ampli-

fiers combine excellent individual amplifier performance

with tight matching and temperature tracking between

amplifiers.

In the design, processing, and testing of the device,

particular attention has been paid to the optimization of the

entire distribution of several key parameters and their

matching. Consequently, the specifications of even the

low cost commercial grade (LT1002C) have been spec-

tacularly improved compared to presently available de-

vices.

Essentially, the input offset voltage of all units is less than

80µV, and matching between amplifiers is consistently

beter than 60µV (see distribution plot below). Input bias

and offset currents, channel separation, common mode

and power suply rejections of the LT1002C are all speci-

fied at levels which were previsouly attainable only on very

expensive, selected grades of other dual devices. Power

dissipation is nearly halved compared to the most popular

precision duals, without adversely affecting noise or speed

performance. A by-product of lower dissipation is de-

creased warm-up drift. For even better performance in a

single precision op amp, refer to the LT1001 data sheet. A

bridge signal conditioning application is shown below.

This circuit illustrates the requirement for both excellent

matching and individual amplifier specifications.

, LTC and LT are registered trademarks of Linear Technology Corporation

Summary of content (16 pages)

PAGE 1
LT1002 Dual, Matched Precision Operational Amplifier U FEATURES ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LT ®1002 dual, matched precision operational amplifiers combine excellent individual amplifier performance with tight matching and temperature tracking between amplifiers. Guaranteed low offset voltage LT1002A 60µV max LT1002 100µV max Guaranteed offset voltage match LT1002A 40µV max LT1002 80µV max Guaranteed low drift LT1002A 0.9µV/°C max LT1002 1.
PAGE 2
LT1002 W U U U W W W ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Supply Voltage (Note 7) ........................................ ±22V Differential Input Voltage ...................................... ±30V Input Voltage Equal to Supply Voltage Output Short Circuit Duration ......................... Indefinite Operating Temperature Range LT1002AM/LT1002M (OBSOLETE) .. – 55°C to 125°C LT1002AC/LT1002C ............................... 0°C to 70°C Storage Temperature Range All Grades ..
PAGE 3
LT1002 U W ELECTRICAL CHARACTERISTICS, I DIVIDUAL A PLIFIERS The ● denotes the specifications which apply over the temperature range – 55°C ≤ TA ≤ 125°C, VS = ±15V,unless otherwise noted. SYMBOL VOS ∆VOS ∆Temp PARAMETER Input Offset Voltage CONDITIONS (Note 2) MIN ● LT1002AM TYP MAX 30 150 Input Offset Current ● 0.8 5.6 1.2 8.5 nA IB Input Bias Current ● ±1.0 ±6.0 ±1.5 ±9.
PAGE 4
LT1002 W U ATCHI G CHARACTERISTICS The ● denotes the specifications which apply over the temperature range – 55°C ≤ TA ≤ 125°C, VS = ±15V, unless otherwise noted. SYMBOL IB + IOS + PARAMETER Input Offset Voltage Match CONDITIONS LT1002AM TYP MAX 50 140 MIN – LT1002M TYP MAX 60 230 ● MIN – Input Offset Voltage Tracking ● – 0.3 1.0 – 0.4 Average Non-Inverting Bias Current ● – ±1.5 ±6.0 – ±1.8 ±10.0 nA 1.5 UNITS µV µV/°C Non-Inverting Offset Current ● – 1.5 6.5 – 1.8 12.
PAGE 5
LT1002 U W TYPICAL PERFORMANCE CHARACTERISTICS Distribution of Offset Voltage Drift with Temperature (Individual Amplifiers) Distribution of Offset Voltage of Individual Amplifiers 70 VS = ±15V TA = 25°C 60 VS = ±15V 30 260 UNITS TESTED 574 UNITS TESTED NUMBER OF UNITS NUMBER OF UNITS 80 35 VS = ±15V 60 40 130 UNITS TESTED 50 25 NUMBER OF UNITS 100 Distribution of Offset Voltage Match Drift with Temperature 40 30 20 20 15 10 20 10 5 0 –1.
PAGE 6
LT1002 U W TYPICAL PERFORMANCE CHARACTERISTICS 30 1.5 VS = ±15V 1.6 1.4 MATCHING: NON INVERTING BIAS CURRENT 1.2 1.0 M N O ATC N -I H I N G N V . : IN V IVI DU OFFS ERING & AL ET C U A RRENT M IND P BI AS C IV I DU URRE AL A NT MP O FF S E T C U R RENT IN D 0.8 0.6 0.4 0.2 0 –50 –25 50 25 75 0 TEMPERATURE (°C) 100 Ib VCM 0.5 DEVICE WITH POSITIVE INPUT CURRENT VS = ±15V TA = 25°C 0 –.5 DEVICE WITH NEGATIVE INPUT CURRENT –1.0 –1.
PAGE 7
LT1002 U W TYPICAL PERFORMANCE CHARACTERISTICS Common Mode Rejection and CMRR Match vs Frequency Channel Separation vs Frequency CHANNEL SEPARATION (dB) 150 RS =10Ω 140 130 120 RS =100Ω 110 100 RS =1k 90 160 VS = ±15V TA = 25°C 140 120 MATCH (< CMRR) 100 CMRR 80 60 40 20 0 80 100 1k 100k 10k FREQUENCY (Hz) 1 1M 10 100 1k 10k FREQUENCY (Hz) 100k 1M Supply Current vs. Supply Voltage For Each Amplifier V + = 12 to 18V V – = –12 to –18V V – = –1.
PAGE 8
LT1002 U W TYPICAL PERFORMANCE CHARACTERISTICS Output Short Circuit Current vs Time Output Swing vs.
PAGE 9
LT1002 U U W U APPLICATIONS INFORMATION 0.1Hz to 10Hz Noise Test Circuit Test Circuit for Offset Voltage and its Drift with Temperature 0.1µF 50k* 100k 15V 3 – (10) 100Ω* 4 (11) + 10Ω 14 (7) 13 (6) 1/2 LT1002 –15V VO = 1000 VOS – A 1/2 LT1002 2k + VO 12 (5) 50k* VOLTAGE GAIN = 50,000 PEAK TO PEAK NOISE MEASURED IN 10 SEC INTERVAL * RESISTORS MUST HAVE LOW THERMOELECTRIC POTENTIAL. DEVICE UNDER TEST + B 1/2 LT1002 4.7µF – 100k 24.3k 1002 TA05 4.3k 0.
PAGE 10
LT1002 U W U U APPLICATIONS INFORMATION Advantages of Matched Dual Op Amps In many applications the performance of a system depends on the matching between two operational amplifiers rather than the individual characteristics of the two op amps. Two or three op amp instrumentation amplifiers, tracking voltage references and low drift active filters are some of the circuits requiring matching between two op amps. The well-known triple op amp configuration illustrates these concepts.
PAGE 11
LT1002 U U W U APPLICATIONS INFORMATION Precision ±10V Reference 15V 130k 5% 3.3k 1% OUT 1 10.000V 10k 4 3 14 + 13 1/2 LT1002 – 10k 0.1% 12 LM129A 0.1% 10 11 3.3k 1% 8.2k 1% 7 – 1/2 LT1002 + 6 OUT 2 –10.000V 5 1k –15V 1002 TA08 The LT1002 contributes less than 5% of the total drift with temperature, noise and long term drift of the reference. The accuracy of the –10V output is limited by the matching of the two 10k resistors.
PAGE 12
LT1002 U U W U APPLICATIONS INFORMATION Two Op Amp Instrumentation Amplifier R5 2.2k† R1 100k* R2 10k R4 100k R3 10k – 1/2 LT1002 – – 1/2 LT1002 + OUTPUT + INPUTS + 1002 TA10 * TRIM FOR COMMON-MODE REJECTION † TRIM FOR GAIN GAIN = R4 1 1+ R3 2 ( ) R2 R3 R2 + R3 + + ≈ 100 R1 R4 R5 Precision Amplifier Drives 500Ω Load to ±10V 1.1Rf + 0.1RS 110k 15V RS 100Ω – B 1/2 LT1002 + –15V Rf 100k 0.
PAGE 13
LT1002 U U W U APPLICATIONS INFORMATION Dead Zone Generator INPUT Q4 100k** 100k** 2 BIPOLAR SYMMETRY IS EXCELLENT BECAUSE ONE DEVICE, Q2, SETS BOTH LIMITS 6 8 + 100k Q3 Q2 – LM301A 3 VSET DEAD ZONE CONTROL INPUT 0 to 5V 10k* 47pF 10k* 4.7k 2k 1 3 30pF Q1 2N4393 10k** – 4 IN914 10k** 10 13 1/2 LT1002 + 10k 11 15V 100k 15pF 2 – LM301A 3 6 + 1/2 LT1002 6 VOUT + 10k Q6 2N4393 4.7k 15pF – 4.7k 3.
PAGE 14
LT1002 U U W U APPLICATIONS INFORMATION 22k* 43k* 100Ω (SELECT) 3 15V 100Ω 5W – 2k 1/2 LT1002 15V 4 Dual Precision Power Supply (1) 0 to 10V in 100µV Steps (2) 0 to 100V in 1mV Steps 2N2219 13 + OUTPUT 1 0-10V 25mA IN914 8.2k VN-46 LM399 TRIAD TY-90 DIODES = SEMTECH # FF-15 KVD 00000 – 99999 + 1 –15V KVD = ESI#DP311 * = JULIE RSCH. LABS #R-44 25k OUTPUT 2 0V-100V, 25mA + VN-46 KELVIN-VARLEY DIVIDER ESI#DP311 4 0.1µF 2.
PAGE 15
LT1002 W W SCHE ATIC DIAGRA V+ 6k 6k Q29 Q27 NULL 40k Q24 Q25 Q28 NULL 40k 1.5k Q5 25k Q12 Q11 Q6 Q13 Q14 3k Q8 Q7 Q31 Q4 Q3 55pF 20pF Q33 20 + 500 Q1A Q1B Q2B 30pF Q2A Q26 3k IN – OUT Q21 20 Q34 Q16 Q10 500 Q15 IN 2k 2k 180Ω 1/2 LT1002 Q32 Q22 T1 Q20 Q23 Q17 Q30 Q9 Q18 8k Q19 V– 120 240 1002 SS U PACKAGE DESCRIPTION J Package 14-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) 0.200 (5.080) MAX 0.300 BSC (0.762 BSC) 0.
PAGE 16
LT1002 U PACKAGE DESCRIPTION N Package 14-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) 0.770* (19.558) MAX 14 13 12 11 10 9 8 1 2 3 4 5 6 7 0.255 ± 0.015* (6.477 ± 0.381) 0.130 ± 0.005 (3.302 ± 0.127) 0.300 – 0.325 (7.620 – 8.255) 0.045 – 0.065 (1.143 – 1.651) 0.020 (0.508) MIN 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 0.005 (0.125) MIN 0.100 (2.54) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.