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LT1101IN8

Precision, Micropower, Single Supply Instrumentation Amplifier (Fixed Gain = 10 or 100)

Linear Technology 

LT1101

Precision, Micropower,

Single Supply Instrumentation

Amplifier (Fixed Gain = 10 or 100)

FEATURES

■ 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

U

APPLICATIO S

■ 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

, LTC and LT are registered trademarks of Linear Technology Corporation.

DESCRIPTIO

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.

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.

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.

TYPICAL APPLICATIO

GROUND 1

(REF)

SHORT TO 1, 2

G = 10

N.C. G = 100

90R

9R

R

90R

9R

R

8

OUTPUT

7 SHORT TO 8

G = 10

N.C. G = 100

–

A

B

INVERTING 3

INPUT

+

R ≈ 9.2k

V– 4

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

Gain Error Distribution

30

G = 100

RL = 50k

25

TA = 25°C

930 UNITS

TESTED

20

IN ALL PACKAGES

15

10

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

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