LT1991IDD Datasheet_PDF文件下载_芯片资料查询

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 鈥?.08 to 鈥?3

Gain Error <0.04%

Gain Drift < 3ppm/掳C

Wide Supply Range: Single 2.7V to Split

卤18V

Micropower: 100碌A Supply Current

Precision: 50碌V Maximum Input Offset Voltage

560kHz Gain Bandwidth Product

Rail-to-Rail Output

Space Saving 10-Lead MSOP and DFN Packages

The LT

庐

1991 combines a precision operational amplifier

with eight precision resistors to form a one-chip solution

for accurately amplifying voltages. Gains from 鈥?3 to 14

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

external components. The device is particularly well suited

for use as a difference amplifier, where the excellent

resistor matching results in a common mode rejection

ratio of greater than 75dB.

The amplifier features a 50碌V 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 100碌A supply current on a 5V supply. The

output swings to within 40mV of either supply rail.

The resistors have excellent matching, 0.04% over tem-

perature for the 450k resistors. The matching temperature

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

are extremely linear with voltage, resulting in a gain

nonlinearity of less than 10ppm.

The LT1991 is fully specified at 5V and

卤15V

supplies and

from 鈥?0掳C to 85掳C. The device is available in space

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

脳

3mm DFN packages.

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

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

APPLICATIO S

鈻?/div>

Handheld Instrumentation

Medical Instrumentation

Strain Gauge Amplifiers

Differential to Single-Ended Conversion

TYPICAL APPLICATIO

Rail-to-Rail Gain = 1 Difference Amplifier

5V

50k

150k

V

M(IN)

鈭哣

IN

V

P(IN)

450k

V

OUT

= V

REF

+

鈭哣

IN

SWING 40mV TO

EITHER RAIL

R

OUT

<0.1鈩?/div>

40

35

PERCENTAGE OF UNITS (%)

鈥?/div>

+

450k

鈥?/div>

450k

150k

50k

4pF

+

LT1991

450k

INPUT RANGE

鈥?.5V TO 5.1V

R

IN

= 900k鈩?/div>

4pF

V

REF

= 2.5V

1991 TA01

U

Distribution of Resistor Matching

450k RESISTORS

LT1991A

30

25

20

15

10

5

0

鈥?0.04

0

鈥?0.02

0.02

RESISTOR MATCHING (%)

0.04

1991TA01b

U

1991fb

1

LT1991IMS,LTC1544CG,LTC1545CG,LTC1553CG

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