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LT1491ACN Datasheet

  • LT1491ACN

  • Voltage-Feedback Operational Amplifier

  • 274.08KB

  • 16頁

  • ETC

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LT1490A/LT1491A
Dual/Quad Over-The-Top
Micropower Rail-to-Rail
Input and Output Op Amps
FEATURES
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
Low Input Offset Voltage: 500
碌
V Max
Output Swings to 10mV Max from V
鈥?/div>
Rail-to-Rail Input and Output
Micropower: 50碌A(chǔ)/Amplifier Max
碌
MSOP Package
Over-The-Top
TM
Input Common Mode Range Extends
44V Above V
鈥?/div>
, Independent of V
+
Specified on 3V, 5V and
鹵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
APPLICATIO S
s
s
s
s
s
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
Supply Current Sensing
Battery Monitoring
Micropower Active Filters
4mA to 20mA Transmitters
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
The LT
廬
1490A/LT1491A are enhanced versions of the popu-
lar LT1490/LT1491 dual and quad op amps with improved
input offset voltage (500碌V max) and output voltage swing
(10mV max from V
鈥?/div>
). They are recommended as replace-
ments for the LT1490/LT1491 in all new designs. The
LT1490A/LT1491A operate on all single and split supplies
with a total voltage of 2V to 44V, drawing only 40碌A(chǔ) 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 sup-
plies. 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 capacitive loads up to 10,000pF when optional
0.22碌F and 150鈩?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 resis-
tors 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
鈥?/div>
or 44V above V
鈥?/div>
, independent of V
+
.
The LT1490A dual op amp is available in the 8-pin MSOP,
PDIP and SO packages. The quad LT1491A is available in
the 14-pin SO and PDIP packages.
TYPICAL APPLICATIO
CHARGER
VOLTAGE
Battery Monitor
R
S
0.2鈩?/div>
I
BATT
RA
2k
R
A
麓
2k
+
1/4 LT1491A
Q1
2N3904
鈥?/div>
1/4 LT1491A
LOGIC
鈥?/div>
Q2
2N3904
+
R
B
2k
R
B
麓
2k
LOAD
+
1/4 LT1491A
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
鈥?/div>
R
G
10k
S1
10k
+
1/4 LT1491A
V
OUT
+
V
BATT
= 12V
鈥?/div>
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
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LT1491ACN 產(chǎn)品屬性

  • LT1490A,91A

  • 25

  • 集成電路 (IC)

  • Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps

  • Over-The-Top®

  • 通用

  • 4

  • 滿擺幅

  • 0.07 V/µs

  • 200kHz

  • -

  • 1nA

  • 250µV

  • 50µA

  • 25mA

  • 2 V ~ 44 V，±1 V ~ 22 V

  • 0°C ~ 70°C

  • 通孔

  • 14-DIP（0.300"，7.62mm）

  • 14-PDIP

  • 管件

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