鈮?/div>
5) op amps with preci-
sion specifications. The extremely low supply current is
combined with excellent amplifier specifications: input
offset voltage is 375碌V maximum with a typical drift of
only 0.4碌V/擄C, input offset current is 100pA maximum. A
minimum open-loop gain (A
VOL
) of 100V/mV ensures that
gain errors are small. The devices鈥?characteristics change
little over the supply range of 2.2V to
鹵15V.
Supply
rejection is 90dB and the common mode rejection ratio is
90dB. Operation is specified for 3V, 5V and
鹵15V
supplies.
Reverse battery protection (鈥?8V min) and inputs that
operate above the positive supply make the LT1672/
LT1673/LT1674 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 4碌V
P-P
is
remarkably low considering the low supply current. For
unity gain stable versions of these amplifiers, see the
LT1494/LT1495/LT1496.
The LT1672 is available in the 8-pin MSOP, PDIP and SO
packages. The LT1673 is available in plastic 8-pin PDIP
and SO-8 packages with the standard dual op amp pinout.
The LT1674 is available in 14-pin PDIP and SO packages.
APPLICATIO S
s
s
s
s
s
s
Battery- or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Micropower Filter
Photodiode Amplifier
High Impedance Circuits
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
Single Supply, 60碌W Precision Instrumentation Amplifier
5V
100k*
V
IN1
80
+
1/2 LT1673
1M
5V
1M
100k
110k
UNITS
鈥?/div>
鈥?/div>
1000pF
110k
1M
100k
1M
LT1672
V
OUT
+
1M
5V
0.0047碌F
LT1389-2.5
1672/3/4 TA01
鈥?/div>
100k*
V
IN2
1/2 LT1673
+
A
V
= 100
BANDWIDTH = 1kHz
CMRR = 65dB AT 120Hz
*500V TRANSIENT PROTECTION
TOTAL SUPPLY CURRENT = 12碌A(chǔ)
U
TC V
OS
Distribution
120 AMPLIFIERS
70 V
S
=
鹵2.5V
鈥?40擄C to 85擄C
60
50
40
30
20
10
0
鈥?.5
鈥?0.9
鈥?0.3
0.3
TC V
OS
(碌V/擄C)
0.9
1.5
1672/3/4 TA02
U
U
1
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