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LT1490A Datasheet

Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp

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LT1490A
Dual Over-The-Top
Micropower Rail-to-Rail
Input and Output Op Amp
FEATURES
s Low Input Offset Voltage: 500µV Max
s Output Swings to 10mV Max from V
s Rail-to-Rail Input and Output
s Micropower: 50µA/Amplifier Max
s MSOP Package
s Over-The-TopTM Input Common Mode Range Extends
44V Above V , Independent of V +
s Specified on 3V, 5V and ±15V Supplies
s High Output Current: 20mA
s Output Drives 10,000pF with Output Compensation
s Reverse Battery Protection to 18V
s No Supply Sequencing Problems
s High Voltage Gain: 1500V/mV
s High CMRR: 98dB
s No Phase Reversal
s Gain Bandwidth Product: 200kHz
U
APPLICATIO S
s Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
s Supply Current Sensing
s Battery Monitoring
s Micropower Active Filters
s 4mA to 20mA Transmitters
DESCRIPTIO
The LT®1490A is an enhanced version of the popular LT1490
op amp with improved input offset voltage (500µV max) and
output voltage swing (10mV max from V ). It is recom-
mended for all new designs. The LT1490A operates on all
single and split supplies with a total voltage of 2V to 44V,
drawing only 40µA of quiescent current per amplifier. It is
reverse supply protected; it draws virtually no current for
reverse supply up to 18V. The input range of the LT1490A
includes both supplies and the output swings to both sup-
plies. Unlike most micropower op amps, the LT1490A can
drive heavy loads; its rail-to-rail output drives 20mA. The
LT1490A is unity-gain stable and drives all capacitive loads
up to 10,000pF when optional 0.22µF and 150compensa-
tion is used.
The LT1490A has a unique input stage that operates 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Battery Monitor
CHARGER
VOLTAGE
RS
0.2
RA
2k
+
Q1
2N3904
IBATT
RA´
2k
1/2 LT1490A
1/2 LT1490A
LOGIC
+
LOAD
RB
2k
RB´
2k
+
VBATT = 12V
Q2
+ 2N3904
1/2 LT1490A
S1
RG
10k
10k
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
+
1/2 LT1490A
90.9k
VOUT
14901A TA01
IBATT
=
VOUT
=
(RS)(RG/RA)(GAIN)
VOUT AMPS
GAIN
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
RA = RB
VS = 5V, 0V
1


Linear Technology Electronic Components Datasheet

LT1490A Datasheet

Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp

No Preview Available !

LT1490A
ABSOLUTE MAXIMUM RATINGS (Note 1)
Total Supply Voltage (V + to V ) ............................. 44V
Differential Input Voltage ........................................ 44V
Input Current ..................................................... ±12mA
Output Short-Circuit Duration (Note 2) ........ Continuous
Junction Temperature .......................................... 150°C
Operating Temperature Range
(Note 3) ............................................. – 40°C to 85°C
Specified Temperature Range (Note 4) .. – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
OUT A 1
–IN A 2
+IN A 3
V4
TOP VIEW
8 V+
7 OUT B
6 –IN B
5 +IN B
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 250°C/ W
ORDER PART
NUMBER
LT1490ACMS8
LT1490AIMS8
MS8 PART MARKING
LTNG
LTPU
Consult factory for Military grade parts.
OUT A 1
–IN A 2
+IN A 3
V4
TOP VIEW
A
B
8 V+
7 OUT B
6 –IN B
5 +IN B
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP 8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
ORDER PART
NUMBER
LT1490ACN8
LT1490ACS8
LT1490AIN8
LT1490AIS8
S8 PART MARKING
1490A
1490AI
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V unless otherwise noted. (Note 4)
SYMBOL PARAMETER
VOS Input Offset Voltage (Note 5)
Input Offset Voltage Drift (Note 9)
IOS Input Offset Current
IB Input Bias Current
Input Noise Voltage
en Input Noise Voltage Density
in Input Noise Current Density
RIN Input Resistance
CONDITIONS
N8, S8 Package
0°C TA 70°C
– 40°C TA 85°C
MS8 Package
0°C TA 70°C
– 40°C TA 85°C
– 40°C TA 85°C
VCM = 44V (Note 6)
VCM = 44V (Note 6)
VS = 0V
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, VCM = 0V to 44V
MIN TYP MAX
110 500
q 700
q 800
220 1000
q 1200
q 1400
q 24
q 0.2 0.8
q 0.8
q 18
q 3 10
0.3
1
50
0.03
6 17
4 11
UNITS
µV
µV
µV
µV
µV
µV
µV/°C
nA
µA
nA
µA
nA
µVP-P
nV/Hz
pA/Hz
M
M
2


Part Number LT1490A
Description Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp
Maker Linear Technology
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LT1490A Datasheet PDF






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