LT1494/LT1495/LT1496
1.5µA Max, Single, Dual
and Quad Over-The-Top Precision
Rail-to-Rail Input and Output Op Amps
FEATURES
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DESCRIPTIO
Low Supply Current: 1.5
µ
A Max
Rail-to-Rail Input and Output
Low Offset Voltage: 375
µ
V Max
Operating Temperature Range: – 40
°
C to 125
°
C
Over-The-Top
TM
Inputs Operate Above V
+
Wide Supply Range: 2.2V to 36V
Single Supply Input Range: – 0.3V to 36V
Low Input Bias Current: 250pA
Low Input Offset Current: 20pA
High A
VOL
: 100V/mV Minimum Driving 100kΩ Load
Output Sources and Sinks 500µA Load Current
Reverse Battery Protected to 18V
The LT
®
1494/LT1495/LT1496 are the lowest power
(I
S
≤
1.5µA) op amps with precision specifications. The
extremely low supply current is combined with excellent
amplifier specifications: input offset voltage is 375µV
maximum with a typical drift of only 0.4µV/°C, input offset
current is 100pA maximum. A minimum open-loop gain
(A
VOL
) of 100V/mV ensures that gain errors are small. The
device characteristics change little over the supply range
of 2.2V to
±15V.
Supply rejection is 90dB and the common
mode rejection ratio is 90dB. Operation is specified for 3V,
5V and
±15V
supplies. Reverse battery protection
(–18V min) and inputs that operate above the positive
supply make the LT1494/LT1495/LT1496 easy to use in
harsh environments.
The low bias currents and offset current of the amplifier
permit the use of megohm level source resistors without
introducing significant errors. Voltage noise at 4µV
P-P
is
remarkably low considering the low supply current.
The LT1494 is available in the 8-Pin MSOP, PDIP and SO
packages.The LT1495 is available in plastic 8-Pin PDIP
and SO packages with the standard dual op amp pinout.
The LT1496 is available in 14-Pin SO and PDIP packages.
APPLICATIO S
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Battery- or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Micropower Filter
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
Micropower Integrating Current Sense
RESET
0.1µF
V
CC
R
I
1M
R
S
0.1Ω 1M
I
L
LOAD
10M
V
CC
200k
10M
1495 TA01
30
25
20
100 AMPLIFIERS
V
S
=
±2.5V
–40°C TO 85°C
1/2 LT1495
–
1/2 LT1495
V
O
UNITS
–
+
15
10
5
0
– 2.0 –1.6 –1.2 –0.8 –0.4 0 0.4 0.8 1.2 1.6 2.0
TC V
OS
(µV/°C)
1495 TA02
+
R
I
C = (4.9A)(SEC) FOR V
CC
= 5V
R
S
I
S
= 3µA DURING INTEGRATION; I
S
= 5µA END OF INTEGRATION
OUTPUT SWITCHES
WHEN I
L
dt = 0.98 V
CC
( )
U
TC V
OS
Distribution
U
U
1
LINER [ LINEAR TECHNOLOGY ]
