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LT1168IN8
(Rev.:RevA)

Low Power, Single Resistor Gain Programmable, Precision Instrumentation Amplifier

Linear Technology 

LT1168

FEATURES

Low Power, Single

Resistor Gain Programmable,

Precision Instrumentation Amplifier

DESCRIPTIO

■ Supply Current: 530µA Max

■ Meets IEC 1000-4-2 Level 4 (±15kV) ESD Tests

with Two External 5k Resistors

■ Single Gain Set Resistor: G = 1 to 10,000

■ Gain Error: G = 10, 0.4% Max

■ Input Offset Voltage Drift: 0.3µV/°C Max

■ Gain Nonlinearity: G = 10, 20ppm Max

■ Input Offset Voltage: 40µV Max

■ Input Bias Current: 250pA Max

■ PSRR at AV =1: 103dB Min

■ CMRR at AV = 1: 90dB Min

■ Wide Supply Range: ±2.3V to ±18V

■ 1kHz Voltage Noise: 10nV/√Hz

■ 0.1Hz to 10Hz Noise: 0.28µVP-P

■ Available in 8-Pin PDIP and SO Packages

U

APPLICATIO S

■ Bridge Amplifiers

■ Strain Gauge Amplifiers

■ Thermocouple Amplifiers

■ Differential to Single-Ended Converters

■ Differential Voltage to Current Converters

■ Data Acquisition

■ Battery-Powered and Portable Equipment

■ Medical Instrumentation

■ Scales

The LT ®1168 is a micropower, precision instrumentation am-

plifier that requires only one external resistor to set gains of

1 to 10,000. The low voltage noise of 10nV/√Hz (at 1kHz) is

not compromised by low power dissipation (350µA typical for

±15V supplies). The wide supply range of ±2.3V to ±18V allows

the LT1168 to fit into a wide variety of industrial as well as

battery-powered applications.

The high accuracy of the LT1168 is due to a 20ppm maximum

nonlinearity and 0.4% max gain error (G = 10). Previous mono-

lithic instrumentation amps cannot handle a 2k load resistor

whereas the nonlinearity of the LT1168 is specified for loads

as low as 2k. The LT1168 is laser trimmed for very low input

offset voltage (40µV max), drift (0.3µV/°C), high CMRR (90dB,

G = 1) and PSRR (103dB, G = 1). Low input bias currents of

250pA max are achieved with the use of superbeta process-

ing. The output can handle capacitive loads up to 1000pF in

any gain configuration while the inputs are ESD protected up

to 13kV (human body). The LT1168 with two external 5k

resistors passes the IEC 1000-4-2 level 4 specification.

The LT1168 is a pin-for-pin improved second source for the

AD620 and INA118. The LT1168, offered in 8-pin PDIP and

SO packages, requires significantly less PC board area than

discrete op amp resistor designs. These advantages make

the LT1168 the most cost effective solution for precision

instrumentation amplifier applications.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

Single Supply* Pressure Monitor

BI TECHNOLOGIES

5V

67-8-3 R40KQ, (0.02% RATIO MATCH)

Gain Nonlinearity

1

3+

40k

8

7

3.5k

3.5k

R1

G = 200

6

LT1168

249Ω

3.5k

3.5k

1

5

2–

4

20k

3+

1/2

1

40k

LT1112

2–

*See Theory of Operation section

REF

IN

ADC

LTC®1286

DIGITAL

DATA

OUTPUT

AGND

1168 TA01

G = 1000

RL = 2k

VOUT = ±10V

OUTPUT VOLTAGE (2V/DIV)

1168 TA01a

1168fa

1

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