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參數(shù)資料
| 型號： | LT1491A |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Quad Micropower Rail-to-Rail Input and Output Op Amps(四路微功耗，滿幅度輸入和輸出運(yùn)算放大器) |
| 中文描述： | 四微軌到軌輸入和輸出運(yùn)算放大器（四路微功耗，滿幅度輸入和輸出運(yùn)算放大器） |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 227K |
| 代理商： | LT1491A |
1
LT1490A/LT1491A
Dual/Quad Over-The-Top
Micropower Rail-to-Rail
Input and Output Op Amps
DESCRIPTIOU
I
Low Input Offset Voltage: 500
μ
V Max
I
Output Swings to 10mV Max from V
–
I
Rail-to-Rail Input and Output
I
Micropower: 50
μ
A/Amplifier Max
I
MSOP Package
I
Over-The-Top
TM
Input Common Mode Range Extends
44V Above V
–
, Independent of V
+
I
Specified on 3V, 5V and
±
15V Supplies
I
High Output Current: 20mA
I
Output Drives 10,000pF with Output Compensation
I
Reverse Battery Protection to 18V
I
No Supply Sequencing Problems
I
High Voltage Gain: 1500V/mV
I
High CMRR: 98dB
I
No Phase Reversal
I
Gain Bandwidth Product: 200kHz
APPLICATIU
The LT
1490A/LT1491A are enhanced versions of the popu-
lar LT1490/LT1491 dual and quad op amps with improved
input offset voltage (500
μ
V max) and output voltage swing
(10mV max from V
–
). 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
μ
A 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
μ
F and 150
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
–
or 44V above V
–
, 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.
I
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
I
Supply Current Sensing
I
Battery Monitoring
I
Micropower Active Filters
I
4mA to 20mA Transmitters
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
Battery Monitor
–
+
–
+
RA
2k
Q2
2N3904
S1
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
R
A
= R
V
S
= 5V, 0V
10k
90.9k
V
OUT
LOGIC
1490A TA01
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
R
G
10k
Q1
2N3904
R
S
0.2
CHARGER
VOLTAGE
1/4 LT1491A
1/4 LT1491A
R
A
′
2k
R
B
2k
V
BATT
= 12V
I
BATT
+
R
B
′
2k
LOAD
–
1/4 LT1491A
+
–
+
OUT
S
)(R
G
/R
A
)(GAIN)
V
OUT
GAIN
I
BATT
= (R
1/4 LT1491A
FEATURES
TYPICAL APPLICATIO
U
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