Datasheet LT1002 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | Dual, Matched Precision Operational Amplifier |
| Seiten / Seite | 16 / 1 — FEATURES. DESCRIPTIO. APPLICATIO S. TYPICAL APPLICATIO. Strain Gauge … |
| Dateiformat / Größe | PDF / 188 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTIO. APPLICATIO S. TYPICAL APPLICATIO. Strain Gauge Signal Conditioner with Bridge Excitation
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LT1002 Dual, Matched Precision Operational Amplifier
U FEATURES DESCRIPTIO
■ Guaranteed low offset voltage The LT®1002 dual, matched precision operational ampli- LT1002A 60µV max fiers combine excellent individual amplifier performance LT1002 100µV max with tight matching and temperature tracking between ■ Guaranteed offset voltage match amplifiers. LT1002A 40µV max In the design, processing, and testing of the device, LT1002 80µV max particular attention has been paid to the optimization of the ■ Guaranteed low drift entire distribution of several key parameters and their LT1002A 0.9µV/°C max matching. Consequently, the specifications of even the LT1002 1.3µV/°C max low cost commercial grade (LT1002C) have been spec- ■ Guaranteed CMRR tacularly improved compared to presently available de- LT1002A 110dB min vices. LT1002 110dB min ■ Guaranteed channel separation Essentially, the input offset voltage of all units is less than LT1002A 132dB min 80µV, and matching between amplifiers is consistently LT1002 130dB min beter than 60µV (see distribution plot below). Input bias ■ Guaranteed matching characteristics and offset currents, channel separation, common mode ■ Low noise 0.35µV and power suply rejections of the LT1002C are all speci- P-P
U
fied at levels which were previsouly attainable only on very
APPLICATIO S
expensive, selected grades of other dual devices. Power dissipation is nearly halved compared to the most popular ■ Thermocouple Amplifiers precision duals, without adversely affecting noise or speed ■ Strain Gauge Amplifiers performance. A by-product of lower dissipation is de- ■ Low level signal processing creased warm-up drift. For even better performance in a ■ Medical instrumentation single precision op amp, refer to the LT1001 data sheet. A ■ Precision dual limit threshold detection bridge signal conditioning application is shown below. ■ 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.
U TYPICAL APPLICATIO Strain Gauge Signal Conditioner with Bridge Excitation
15V
Distribution of Offset Voltage Match
15V 8.2k 2k* 100Ω 5W 4 + 70 REFERENCE OUT V 13 2k S = ±15V 1/2 TO MONITORING 2N2219 TA = 25°C LM329 4.99k* LT1002 A/D CONVERTER 60 3 – 287 UNITS TESTED IN4148 50 3 + 350Ω BRIDGE 40 6 0V TO 10V 10k LT1001 OUT ZERO 2 30 301k* – 1µF 340k* NUMBER OF UNITS 20 10 1.1k* – IN4148 GAIN 10 1/2 TRIM 2N2907 LT1002 6 11 2k 0 + –100 –80 –60 –40 –20 0 20 40 60 80 100 100Ω 5W INPUT OFFSET VOLTAGE MATCH (µV) *RN60C FILM RESISTORS 1002 TA01 1002 TA02 –15V 1002fb 1
U FEATURES DESCRIPTIO
■ Guaranteed low offset voltage The LT®1002 dual, matched precision operational ampli- LT1002A 60µV max fiers combine excellent individual amplifier performance LT1002 100µV max with tight matching and temperature tracking between ■ Guaranteed offset voltage match amplifiers. LT1002A 40µV max In the design, processing, and testing of the device, LT1002 80µV max particular attention has been paid to the optimization of the ■ Guaranteed low drift entire distribution of several key parameters and their LT1002A 0.9µV/°C max matching. Consequently, the specifications of even the LT1002 1.3µV/°C max low cost commercial grade (LT1002C) have been spec- ■ Guaranteed CMRR tacularly improved compared to presently available de- LT1002A 110dB min vices. LT1002 110dB min ■ Guaranteed channel separation Essentially, the input offset voltage of all units is less than LT1002A 132dB min 80µV, and matching between amplifiers is consistently LT1002 130dB min beter than 60µV (see distribution plot below). Input bias ■ Guaranteed matching characteristics and offset currents, channel separation, common mode ■ Low noise 0.35µV and power suply rejections of the LT1002C are all speci- P-P
U
fied at levels which were previsouly attainable only on very
APPLICATIO S
expensive, selected grades of other dual devices. Power dissipation is nearly halved compared to the most popular ■ Thermocouple Amplifiers precision duals, without adversely affecting noise or speed ■ Strain Gauge Amplifiers performance. A by-product of lower dissipation is de- ■ Low level signal processing creased warm-up drift. For even better performance in a ■ Medical instrumentation single precision op amp, refer to the LT1001 data sheet. A ■ Precision dual limit threshold detection bridge signal conditioning application is shown below. ■ 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.
U TYPICAL APPLICATIO Strain Gauge Signal Conditioner with Bridge Excitation
15V
Distribution of Offset Voltage Match
15V 8.2k 2k* 100Ω 5W 4 + 70 REFERENCE OUT V 13 2k S = ±15V 1/2 TO MONITORING 2N2219 TA = 25°C LM329 4.99k* LT1002 A/D CONVERTER 60 3 – 287 UNITS TESTED IN4148 50 3 + 350Ω BRIDGE 40 6 0V TO 10V 10k LT1001 OUT ZERO 2 30 301k* – 1µF 340k* NUMBER OF UNITS 20 10 1.1k* – IN4148 GAIN 10 1/2 TRIM 2N2907 LT1002 6 11 2k 0 + –100 –80 –60 –40 –20 0 20 40 60 80 100 100Ω 5W INPUT OFFSET VOLTAGE MATCH (µV) *RN60C FILM RESISTORS 1002 TA01 1002 TA02 –15V 1002fb 1