1 Features

• Low Offset Voltage: 75 μV (Maximum), G ≥ 100

• Low Drift: 0.3 μV/°C, G ≥ 100

• Low Noise: 50 nV/√Hz, G ≥ 100

• High CMRR: 100 dB (Minimum), G ≥ 10

• Low Input Bias Current: 200 pA (Maximum)

• Supply Range: 1.8 V to 5.5 V

• Input Voltage: (V–) 0.1 V to (V+) –0.1 V

• Output Range: (V–) 0.05 V to (V+) –0.05 V

• Low Quiescent Current: 50 μA

• Operating Temperature: –40°C to +125°C

• RFI Filtered Inputs

• 8-Pin VSSOP Package

2 Applications

• Bridge Amplifiers

• ECG Amplifiers

• Pressure Sensors

• Medical Instrumentation

• Portable Instrumentation

• Weigh Scales

• Thermocouple Amplifiers

• RTD Sensor Amplifiers

• Data Acquisition

3 Description

The INA317 is a low-power, precision instrumentation

amplifier offering excellent accuracy. The versatile 3-

operational amplifier design, small size and low

power make the INA317 usable in a wide range of

portable applications.

A single external resistor sets any gain from 1 to

1000, as defined by the industry-standard gain

equation: G = 1 + (100 kΩ / RG).

The instrumentation amplifier provides low offset

voltage (75 μV, G ≥ 100), excellent offset voltage drift

(0.3 μV/°C, G ≥ 100) and high common-mode

rejection (100 dB at G ≥ 10). The INA317 operates

with power supplies as low as 1.8 V (±0.9 V) and a

quiescent current of 50 μA, making the device usable

in battery-operated systems. Using autocalibration

techniques to ensure precision over the extended

industrial temperature range, the INA317 device

offers low noise density (50 nV/√Hz) that extends

down to DC.

The INA317 is available in an 8-pin VSSOP surfacemount

package and is specified over the TA = –40°C

to +125°C temperature range.