1
LT1494/LT1495/LT1496
TYPICAL APPLICATION
U
APPLICATIO S
U
FEATURES
1.5µA Max, Single, Dual
and Quad Over-The-Top Precision
Rail-to-Rail Input and Output Op Amps
■
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.
■
Battery- or Solar-Powered Systems
■
Portable Instrumentation
■
Remote Sensor Amplifier
■
Micropower Filter
Micropower Integrating Current Sense
+
–
1/2 LT1495
0.1µF
RESET
R
I
1M
1M
R
S
0.1Ω
LOAD
+
–
1/2 LT1495
I
L
V
CC
10M10M
V
CC
V
O
OUTPUT SWITCHES
WHEN I
L
dt = 0.98 V
CC
I
S
= 3µA DURING INTEGRATION; I
S
= 5µA END OF INTEGRATION
C = (4.9A)(SEC) FOR V
CC
= 5V
R
I
R
S
()
1495 TA01
200k
TC V
OS
Distribution
TC V
OS
(µV/°C)
UNITS
30
25
20
15
10
5
0
–1.2 –0.4 0.4 1.2
1495 TA02
2.0–1.6–2.0 –0.8 0 0.8 1.6
100 AMPLIFIERS
V
S
= ±2.5V
–40°C TO 85°C
DESCRIPTIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
