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LT1491A

产品描述Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps
文件大小340KB,共16页
制造商Linear ( ADI )
官网地址http://www.analog.com/cn/index.html
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LT1491A概述

Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps

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LT1490A/LT1491A
Dual/Quad Over-The-Top
Micropower Rail-to-Rail
Input and Output Op Amps
FEATURES
DESCRIPTIO
Low Input Offset Voltage: 500
µ
V Max
Output Swings to 10mV Max from V
Rail-to-Rail Input and Output
Micropower: 50µA/Amplifier Max
µ
®
Over-The-Top Input Common Mode Range Extends
44V Above V
, Independent of V
+
Specified on 3V, 5V and
±15V
Supplies
High Output Current: 20mA
Output Drives 10,000pF with Output Compensation
Reverse Battery Protection to 18V
No Supply Sequencing Problems
High Voltage Gain: 1500V/mV
High CMRR: 98dB
No Phase Reversal
Gain Bandwidth Product: 200kHz
Tiny 3mm
×
3mm
×
0.8mm DFN Package
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
Supply Current Sensing
Battery Monitoring
Micropower Active Filters
4mA to 20mA Transmitters
The LT
®
1490A/LT1491A are dual and quad op amps with a
low input offset voltage of 500µV max. The LT1490A/LT1491A
operate on all single and split supplies with a total voltage of
2V to 44V, drawing only 40µA of quiescent current per
amplifier. These amplifiers are reverse supply protected;
they draw virtually no current for reverse supply up to 18V.
The input range of the LT1490A/LT1491A includes both
supplies and the output swings to both supplies. Unlike most
micropower op amps, the LT1490A/LT1491A can drive
heavy loads; their rail-to-rail outputs drive 20mA. The
LT1490A/LT1491A are unity-gain stable and drive all capaci-
tive loads up to 10,000pF when optional 0.22µF and 150Ω
compensation is used.
The LT1490A/LT1491A have a unique input stage that oper-
ates and remains high impedance when above the positive
supply. The inputs take 44V both differential and common
mode even when operating on a 3V supply. Built-in resistors
protect the inputs for faults below the negative supply up to
15V. There is no phase reversal of the output for inputs 15V
below V
or 44V above V
, independent of V
+
.
The LT1490A dual op amp is available in the 8-pin MSOP,
PDIP and SO packages. For space limited applications
LT1490A is available in a 3mm
×
3mm
×
0.8mm, dual fine
pitch leadless package (DFN). The quad LT1491A is available
in the 14-pin SO, PDIP and 5mm
×
3mm
×
0.8mm DFN
packages.
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a registered trademark of Linear Technology Corporation.
Protected by U.S. Patents including 5825228.
TYPICAL APPLICATIO
CHARGER
VOLTAGE
Battery Monitor
R
S
0.2Ω
I
BATT
RA
2k
R
A
´
2k
+
1/4 LT1491A
Q1
2N3904
1/4 LT1491A
LOGIC
Q2
2N3904
+
R
B
2k
R
B
´
2k
LOAD
+
1/4 LT1491A
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
R
G
10k
S1
10k
+
1/4 LT1491A
V
OUT
+
V
BATT
= 12V
90.9k
1490A TA01
V
OUT
V
I
BATT
=
=
OUT
AMPS
(R
S
)(R
G
/R
A
)(GAIN) GAIN
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
R
A
= R
B
V
S
= 5V, 0V
U
sn1490, 14901afbs
U
U
1

LT1491A相似产品对比

LT1491A LT1490A LT1490A_1 LT1490ACMS8
描述 Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps

 
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