Datasheet > LT1991

LT1991

更新时间： 2024-11-26 04:19:39

品牌	Logo	应用领域
Linear Systems		放大器
页数	文件大小	规格书
24页	297K
描述
Precision, 100UA Gain Selectable Amplifier

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LT1991 数据手册

LT1991

Precision, 100µA

Gain Selectable Amplifier

FEATURES

DESCRIPTIO

The LT^®1991 combines a precision operational amplifier

with eight precision resistors to form a one-chip solution

for accurately amplifying voltages. Gains from –13 to 14

with a gain accuracy of 0.04% can be achieved using no

externalcomponents.Thedeviceisparticularlywellsuited

for use as a difference amplifier, where the excellent

resistor matching results in a common mode rejection

ratio of greater than 75dB.

■

Pin Configurable as a Difference Amplifier,

Inverting and Noninverting Amplifier

■

Difference Amplifier

Gain Range 1 to 13

CMRR >75dB

■

Noninverting Amplifier

Gain Range 0.07 to 14

■

Inverting Amplifier

Gain Range –0.08 to –13

The amplifier features a 50µV maximum input offset

voltage and a gain bandwidth product of 560kHz. The

device operates from any supply voltage from 2.7V to 36V

and draws only 100µA supply current on a 5V supply. The

output swings to within 40mV of either supply rail.

■

Gain Error <0.04%

■

Gain Drift < 3ppm/°C

■

Wide Supply Range: Single 2.7V to Split ±18V

■

Micropower: 100µA Supply Current

■

Precision: 50µV Maximum Input Offset Voltage

■

The resistors have excellent matching, 0.04% over tem-

peratureforthe450kresistors. Thematchingtemperature

coefficent is guaranteed less than 3ppm/°C. The resistors

are extremely linear with voltage, resulting in a gain

nonlinearity of less than 10ppm.

560kHz Gain Bandwidth Product

■

Rail-to-Rail Output

■

Space Saving 10-Lead MSOP and DFN Packages

APPLICATIO S

The LT1991 is fully specified at 5V and ±15V supplies and

from –40°C to 85°C. The device is available in space

saving 10-lead MSOP and low profile (0.8mm) 3mm ×

3mm DFN packages.

■

Handheld Instrumentation

■

Medical Instrumentation

■

Strain Gauge Amplifiers

Differential to Single-Ended Conversion

■

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

All other trademarks are the property of their respective owners. Patent Pending.

TYPICAL APPLICATIO

Rail-to-Rail Gain = 1 Difference Amplifier

Distribution of Resistor Matching

= V

+ ∆V

OUT

REF IN

450k RESISTORS

LT1991A

SWING 40mV TO

EITHER RAIL

<0.1Ω

OUT

50k

150k

450k

4pF

–

M(IN)

–

∆V

450k

150k

50k

LT1991

P(IN)

450k

INPUT RANGE

–0.5V TO 5.1V

= 900kΩ

–0.04

–0.02

0.02

0.04

4pF

RESISTOR MATCHING (%)

REF

= 2.5V

1991TA01b

1991 TA01

1991fb

12 3 4 5 6 7...24

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