1 Features

1• Low Offset Voltage: 25 μV (Maximum), G ≥ 100

• Low Drift: 0.1 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 and 8-Pin WSON Packages

2 Applications

• Bridge Amplifiers

• ECG Amplifiers

• Pressure Sensors

• Medical Instrumentation

• Portable Instrumentation

• Weigh Scales

• Thermocouple Amplifiers

• RTD Sensor Amplifiers

• Data Acquisition

3 Description

The INA333 device is a low-power, precision

instrumentation amplifier offering excellent accuracy.

The versatile 3-operational amplifier design, small

size, and low power make it ideal for a wide range of

portable applications.

A single external resistor sets any gain from 1 to

1000. The INA333 is designed to use an industrystandard

gain equation: G = 1 + (100 kΩ / RG).

The INA333 device provides very low offset voltage

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

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

rejection (100 dB at G ≥ 10). It operates with power

supplies as low as 1.8 V (±0.9 V) and quiescent

current is only 50 μA, making it ideal for batteryoperated

systems. Using autocalibration techniques

to ensure excellent precision over the extended

industrial temperature range, the INA333 device also

offers exceptionally low noise density (50 nV/√Hz)

that extends down to DC.

The INA333 device is available in both 8-pin VSSOP

and WSON surface-mount packages and is specified

over the TA = –40°C to +125°C temperature range.