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| 型號： | LBMM |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Precision, 100UA Gain Selectable Amplifier |
| 中文描述： | 精密，100uA的可選增益放大器 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大小： | 311K |
| 代理商： | LBMM |
LT1991
1
1991fb
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patent Pending.
Precision, 100
μ
A
Gain Selectable Amplifier
TYPICAL APPLICATIO
U
FEATURES
DESCRIPTIOU
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
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
μ
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
μ
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/
°
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
±
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.
APPLICATIU
■
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
■
Gain Error <0.04%
■
Gain Drift < 3ppm/
°
C
■
Wide Supply Range: Single 2.7V to Split
±
18V
■
Micropower: 100
μ
A Supply Current
■
Precision: 50
μ
V Maximum Input Offset Voltage
■
560kHz Gain Bandwidth Product
■
Rail-to-Rail Output
■
Space Saving 10-Lead MSOP and DFN Packages
■
Handheld Instrumentation
■
Medical Instrumentation
■
Strain Gauge Amplifiers
■
Differential to Single-Ended Conversion
Rail-to-Rail Gain = 1 Difference Amplifier
Distribution of Resistor Matching
–
+
5V
V
IN
V
M(IN)
V
P(IN)
–
+
V
= V
+
V
IN
SWING 40mV TO
EITHER RAIL
R
OUT
<0.1
V
REF
=
2.5V
1991 TA01
INPUT RANGE
–0.5V TO 5.1V
R
IN
= 900k
LT1991
450k
50k
50k
150k
150k
450k
450k
4pF
450k
4pF
RESISTOR MATCHING (%)
P
0.04
1991TA01b
–0.02
0
0.02
40
35
30
25
20
15
10
5
0
–0.04
450k RESISTORS
LT1991A
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