LT1101
Precision, Micropower,
Single Supply Instrumentation
Amplifier (Fixed Gain = 10 or 100)
DESCRIPTIO
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FEATURES
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The LT®1101 establishes the following milestones:
(1) It is the first micropower instrumentation amplifier,
(2) It is the first single supply instrumentation amplifier,
(3) It is the first instrumentation amplifier to feature fixed
gains of 10 and/or 100 in low cost, space-saving 8-lead
packages.
Gain Error: 0.04% Max
Gain Nonlinearity: 0.0008% (8ppm) Max
Gain Drift: 4ppm/°C Max
Supply Current: 105µA Max
Offset Voltage: 160µV Max
Offset Voltage Drift: 0.4µV/°C Typ
Offset Current: 600pA Max
CMRR, G = 100: 100dB Min
0.1Hz to 10Hz Noise: 0.9µVp-p Typ
2.3pAp-p Typ
Gain Bandwidth Product: 250kHz Min
Single or Dual Supply Operation
Surface Mount Package Available
The LT1101 is completely self-contained: no external gain
setting resistor is required. The LT1101 combines its
micropower operation (75µA supply current) with a
gain error of 0.008%, gain linearity of 3ppm, gain drift of
1ppm/°C. The output is guaranteed to drive a 2k load to
±10V with excellent gain accuracy.
Other precision specifications are also outstanding:
50µV input offset voltage, 130pA input offset current, and
low drift (0.4µV/°C and 0.7pA/°C). In addition, unlike other
instrumentation amplifiers, there is no output offset
voltage contribution to total error.
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APPLICATIO S
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Differential Signal Amplification in Presence of
Common Mode Voltage
Micropower Bridge Transducer Amplifier
– Thermocouples
– Strain Gauges
– Thermistors
Differential Voltage-to-Current Converter
Transformer Coupled Amplifier
4mA to 20mA Bridge Transmitter
A full set of specifications are provided with ±15V dual
supplies and for single 5V supply operation. The LT1101
can be operated from a single lithium cell or two Ni-Cad
batteries. Battery voltage can drop as low as 1.8V, yet the
LT1101 still maintains its gain accuracy. In single supply
applications, both input and output voltages swing
to within a few millivolts of ground. The output sinks
current while swinging to ground—no external, power
consuming pull down resistors are needed.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Gain Error Distribution
GROUND 1
(REF)
8
9R
9R
R
–
20
G = 100
RL = 50k
TA = 25°C
930 UNITS
TESTED
IN ALL PACKAGES
15
10
B
R ≈ 9.2k
+
A
+
7 SHORT TO 8
G = 10
N.C. G = 100
R
–
INVERTING 3
INPUT
4
V–
25
90R
PERCENT OF UNITS
90R
SHORT TO 1, 2
G = 10
N.C. G = 100
30
OUTPUT
GROUND PIN 1, OUTPUT AT PIN 8
G = 100: NO ADDITIONAL CONNECTIONS
G = 10: SHORT PIN 2 TO PIN 1, SHORT PIN 7 TO PIN 8
6 NONINVERTING
INPUT
5 +
V
LT1101 • TA01
5
0
–0.04 –0.03 –0.02 –0.01 0 0.01 0.02 0.03 0.04
GAIN ERROR (%)
LT1101 • TA02
1101fa
1
