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LT1491CN Datasheet

  • LT1491CN

  • Dual and Quad Micropower Rail-to-Rail Input and Output Op Am...

  • 12頁(yè)

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LT1490/LT1491
Dual and Quad
Micropower Rail-to-Rail
Input and Output Op Amps
FEATURES
s
s
s
s
s
s
s
s
s
s
s
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DESCRIPTION
The dual LT
廬
1490 and quad LT1491 op amps 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 no current
for reverse supply up to 18V. The input range of the LT1490/
LT1491 includes both supplies and the output swings to both
supplies. Unlike most micropower op amps, the LT1490/
LT1491 can drive heavy loads; their rail-to-rail outputs drive
20mA. The LT1490/LT1491 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 LT1490/LT1491 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 22V. There is no phase reversal of the output for inputs
22V below V
鈥?/div>
or 44V above V
鈥?/div>
, independent of V
+
.
The LT1490 dual op amp is available in the 8-pin SO and
PDIP packages. The quad LT1491 is available in the 14-pin
SO and PDIP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Rail-to-Rail Input and Output
Single Supply Input Range: 鈥?0.4V to 44V
Micropower: 50碌A(chǔ)/Amplifier Max
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
APPLICATIONS
s
s
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s
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
Supply Current Sensing
Battery Monitoring
Micropower Active Filters
4mA to 20mA Transmitters
TYPICAL APPLICATION
CHARGER
VOLTAGE
R
S
0.2鈩?/div>
I
BATT
RA
2k
R
A
'
2k
Battery Monitor
Q1
2N3904
+
鈥?/div>
A
1/4 LT1491
鈥?/div>
C
1/4 LT1491
+
R
B
2k
R
B
'
2k
LOAD
+
鈥?/div>
Q2
2N3904
B
1/4 LT1491
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
+
V
BATT
= 12V
S1
R
G
10k
10k
D
1/4 LT1491
+
鈥?/div>
90.9k
I
BATT
=
V
OUT
V
=
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
U
U
LOGIC
V
OUT
1490/91 TA01
1

LT1491CN 產(chǎn)品屬性

  • LT1490/91

  • 25

  • 集成電路 (IC)

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

  • Over-The-Top®

  • 通用

  • 4

  • 滿(mǎn)擺幅

  • 0.07 V/µs

  • 200kHz

  • -

  • 4nA

  • 350µV

  • 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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